BAIN CAPITAL VENTURE INVESTORS, LLC

SEC source: 0000899243-21-042573 · doc4.xml · nonDerivative · entry 9

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2009, L.P. · CIK 0001512988 · 10% owner

Bain Capital Venture Partners 2009, L.P. · CIK 0001512989 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 8,176,418

F2 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was reclassified into one share of Class A Common Stock upon the closing of the Issuer's initial public offering (the "Reclassification").

F2 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was reclassified into one share of Class A Common Stock upon the closing of the Issuer's initial public offering (the "Reclassification").

F3 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2009, L.P. ("BCV Partners 2009"), which is the general partner of Bain Capital Venture Fund 2009, L.P. ("BCV Fund 2009"). As a result, BCV Partners 2009 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2009. BCV Partners 2009 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: (Continued from footnote 3) In the Conversion, the 3,808,891 shares of Seed Series Convertible Preferred Stock, 1,636,386 shares of Series A Convertible Preferred Stock, 326,711 shares of Series C Convertible Preferred Stock, 348,609 shares of Series D Convertible Preferred Stock, 485,582 shares of Series E Convertible Preferred Stock, 492,291 shares of Series F Convertible Preferred Stock and 119,445 shares of Series G Convertible Preferred Stock held by BCV Fund 2009 automatically converted into an aggregate of 7,217,915 shares of Common Stock. Following the Conversion, BCV Fund 2009 held 7,644,627 shares of Common Stock, which were automatically reclassified into 7,644,627 shares of Class A Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 151,354 shares of Seed Series Convertible Preferred Stock, 41,336 shares of Series A Convertible Preferred Stock, 40,712 shares of Series C Convertible Preferred Stock, 43,440 shares of Series D Convertible Preferred Stock, 60,508 shares of Series E Convertible Preferred Stock, 61,344 shares of Series F Convertible Preferred Stock and 14,884 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into an aggregate of 413,578 shares of Common Stock. Following the Conversion, BCIP Venture held 466,750 shares of Common Stock, which were automatically reclassified into 466,750 shares of Class A Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 31,755 shares of Seed Series Convertible Preferred Stock, 13,453 shares of Series A Convertible Preferred Stock, 2,946 shares of Series C Convertible Preferred Stock, 3,144 shares of Series D Convertible Preferred Stock, 4,379 shares of Series E Convertible Preferred Stock, 4,439 shares of Series F Convertible Preferred Stock and 1,077 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2009 and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into an aggregate of 61,193 shares of Common Stock. Following the Conversion, BCIP Venture-B held 65,041 shares of Common Stock, which were automatically reclassified into 65,041 shares of Class A Common Stock in the Reclassification.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-042573 · doc4.xml · nonDerivative · entry 8

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2009, L.P. · CIK 0001512988 · 10% owner

Bain Capital Venture Partners 2009, L.P. · CIK 0001512989 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

F2 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was reclassified into one share of Class A Common Stock upon the closing of the Issuer's initial public offering (the "Reclassification").

F2 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of Common Stock was reclassified into one share of Class A Common Stock upon the closing of the Issuer's initial public offering (the "Reclassification").

F3 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2009, L.P. ("BCV Partners 2009"), which is the general partner of Bain Capital Venture Fund 2009, L.P. ("BCV Fund 2009"). As a result, BCV Partners 2009 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2009. BCV Partners 2009 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: (Continued from footnote 3) In the Conversion, the 3,808,891 shares of Seed Series Convertible Preferred Stock, 1,636,386 shares of Series A Convertible Preferred Stock, 326,711 shares of Series C Convertible Preferred Stock, 348,609 shares of Series D Convertible Preferred Stock, 485,582 shares of Series E Convertible Preferred Stock, 492,291 shares of Series F Convertible Preferred Stock and 119,445 shares of Series G Convertible Preferred Stock held by BCV Fund 2009 automatically converted into an aggregate of 7,217,915 shares of Common Stock. Following the Conversion, BCV Fund 2009 held 7,644,627 shares of Common Stock, which were automatically reclassified into 7,644,627 shares of Class A Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 151,354 shares of Seed Series Convertible Preferred Stock, 41,336 shares of Series A Convertible Preferred Stock, 40,712 shares of Series C Convertible Preferred Stock, 43,440 shares of Series D Convertible Preferred Stock, 60,508 shares of Series E Convertible Preferred Stock, 61,344 shares of Series F Convertible Preferred Stock and 14,884 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into an aggregate of 413,578 shares of Common Stock. Following the Conversion, BCIP Venture held 466,750 shares of Common Stock, which were automatically reclassified into 466,750 shares of Class A Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 31,755 shares of Seed Series Convertible Preferred Stock, 13,453 shares of Series A Convertible Preferred Stock, 2,946 shares of Series C Convertible Preferred Stock, 3,144 shares of Series D Convertible Preferred Stock, 4,379 shares of Series E Convertible Preferred Stock, 4,439 shares of Series F Convertible Preferred Stock and 1,077 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2009 and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into an aggregate of 61,193 shares of Common Stock. Following the Conversion, BCIP Venture-B held 65,041 shares of Common Stock, which were automatically reclassified into 65,041 shares of Class A Common Stock in the Reclassification.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-042573 · doc4.xml · nonDerivative · entry 7

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2009, L.P. · CIK 0001512988 · 10% owner

Bain Capital Venture Partners 2009, L.P. · CIK 0001512989 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 8,176,418

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Seed Series, Series A, Series C, Series D, Series E, Series F and Series G Convertible Preferred Stock automatically converted into Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F3 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2009, L.P. ("BCV Partners 2009"), which is the general partner of Bain Capital Venture Fund 2009, L.P. ("BCV Fund 2009"). As a result, BCV Partners 2009 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2009. BCV Partners 2009 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: (Continued from footnote 3) In the Conversion, the 3,808,891 shares of Seed Series Convertible Preferred Stock, 1,636,386 shares of Series A Convertible Preferred Stock, 326,711 shares of Series C Convertible Preferred Stock, 348,609 shares of Series D Convertible Preferred Stock, 485,582 shares of Series E Convertible Preferred Stock, 492,291 shares of Series F Convertible Preferred Stock and 119,445 shares of Series G Convertible Preferred Stock held by BCV Fund 2009 automatically converted into an aggregate of 7,217,915 shares of Common Stock. Following the Conversion, BCV Fund 2009 held 7,644,627 shares of Common Stock, which were automatically reclassified into 7,644,627 shares of Class A Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 151,354 shares of Seed Series Convertible Preferred Stock, 41,336 shares of Series A Convertible Preferred Stock, 40,712 shares of Series C Convertible Preferred Stock, 43,440 shares of Series D Convertible Preferred Stock, 60,508 shares of Series E Convertible Preferred Stock, 61,344 shares of Series F Convertible Preferred Stock and 14,884 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into an aggregate of 413,578 shares of Common Stock. Following the Conversion, BCIP Venture held 466,750 shares of Common Stock, which were automatically reclassified into 466,750 shares of Class A Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 31,755 shares of Seed Series Convertible Preferred Stock, 13,453 shares of Series A Convertible Preferred Stock, 2,946 shares of Series C Convertible Preferred Stock, 3,144 shares of Series D Convertible Preferred Stock, 4,379 shares of Series E Convertible Preferred Stock, 4,439 shares of Series F Convertible Preferred Stock and 1,077 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2009 and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into an aggregate of 61,193 shares of Common Stock. Following the Conversion, BCIP Venture-B held 65,041 shares of Common Stock, which were automatically reclassified into 65,041 shares of Class A Common Stock in the Reclassification.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-042573 · doc4.xml · nonDerivative · entry 6

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2009, L.P. · CIK 0001512988 · 10% owner

Bain Capital Venture Partners 2009, L.P. · CIK 0001512989 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 8,041,012

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Seed Series, Series A, Series C, Series D, Series E, Series F and Series G Convertible Preferred Stock automatically converted into Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F3 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2009, L.P. ("BCV Partners 2009"), which is the general partner of Bain Capital Venture Fund 2009, L.P. ("BCV Fund 2009"). As a result, BCV Partners 2009 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2009. BCV Partners 2009 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: (Continued from footnote 3) In the Conversion, the 3,808,891 shares of Seed Series Convertible Preferred Stock, 1,636,386 shares of Series A Convertible Preferred Stock, 326,711 shares of Series C Convertible Preferred Stock, 348,609 shares of Series D Convertible Preferred Stock, 485,582 shares of Series E Convertible Preferred Stock, 492,291 shares of Series F Convertible Preferred Stock and 119,445 shares of Series G Convertible Preferred Stock held by BCV Fund 2009 automatically converted into an aggregate of 7,217,915 shares of Common Stock. Following the Conversion, BCV Fund 2009 held 7,644,627 shares of Common Stock, which were automatically reclassified into 7,644,627 shares of Class A Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 151,354 shares of Seed Series Convertible Preferred Stock, 41,336 shares of Series A Convertible Preferred Stock, 40,712 shares of Series C Convertible Preferred Stock, 43,440 shares of Series D Convertible Preferred Stock, 60,508 shares of Series E Convertible Preferred Stock, 61,344 shares of Series F Convertible Preferred Stock and 14,884 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into an aggregate of 413,578 shares of Common Stock. Following the Conversion, BCIP Venture held 466,750 shares of Common Stock, which were automatically reclassified into 466,750 shares of Class A Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 31,755 shares of Seed Series Convertible Preferred Stock, 13,453 shares of Series A Convertible Preferred Stock, 2,946 shares of Series C Convertible Preferred Stock, 3,144 shares of Series D Convertible Preferred Stock, 4,379 shares of Series E Convertible Preferred Stock, 4,439 shares of Series F Convertible Preferred Stock and 1,077 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2009 and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into an aggregate of 61,193 shares of Common Stock. Following the Conversion, BCIP Venture-B held 65,041 shares of Common Stock, which were automatically reclassified into 65,041 shares of Class A Common Stock in the Reclassification.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-042573 · doc4.xml · nonDerivative · entry 5

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2009, L.P. · CIK 0001512988 · 10% owner

Bain Capital Venture Partners 2009, L.P. · CIK 0001512989 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 7,482,938

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Seed Series, Series A, Series C, Series D, Series E, Series F and Series G Convertible Preferred Stock automatically converted into Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F3 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2009, L.P. ("BCV Partners 2009"), which is the general partner of Bain Capital Venture Fund 2009, L.P. ("BCV Fund 2009"). As a result, BCV Partners 2009 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2009. BCV Partners 2009 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: (Continued from footnote 3) In the Conversion, the 3,808,891 shares of Seed Series Convertible Preferred Stock, 1,636,386 shares of Series A Convertible Preferred Stock, 326,711 shares of Series C Convertible Preferred Stock, 348,609 shares of Series D Convertible Preferred Stock, 485,582 shares of Series E Convertible Preferred Stock, 492,291 shares of Series F Convertible Preferred Stock and 119,445 shares of Series G Convertible Preferred Stock held by BCV Fund 2009 automatically converted into an aggregate of 7,217,915 shares of Common Stock. Following the Conversion, BCV Fund 2009 held 7,644,627 shares of Common Stock, which were automatically reclassified into 7,644,627 shares of Class A Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 151,354 shares of Seed Series Convertible Preferred Stock, 41,336 shares of Series A Convertible Preferred Stock, 40,712 shares of Series C Convertible Preferred Stock, 43,440 shares of Series D Convertible Preferred Stock, 60,508 shares of Series E Convertible Preferred Stock, 61,344 shares of Series F Convertible Preferred Stock and 14,884 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into an aggregate of 413,578 shares of Common Stock. Following the Conversion, BCIP Venture held 466,750 shares of Common Stock, which were automatically reclassified into 466,750 shares of Class A Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 31,755 shares of Seed Series Convertible Preferred Stock, 13,453 shares of Series A Convertible Preferred Stock, 2,946 shares of Series C Convertible Preferred Stock, 3,144 shares of Series D Convertible Preferred Stock, 4,379 shares of Series E Convertible Preferred Stock, 4,439 shares of Series F Convertible Preferred Stock and 1,077 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2009 and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into an aggregate of 61,193 shares of Common Stock. Following the Conversion, BCIP Venture-B held 65,041 shares of Common Stock, which were automatically reclassified into 65,041 shares of Class A Common Stock in the Reclassification.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-042573 · doc4.xml · nonDerivative · entry 4

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2009, L.P. · CIK 0001512988 · 10% owner

Bain Capital Venture Partners 2009, L.P. · CIK 0001512989 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 6,932,469

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Seed Series, Series A, Series C, Series D, Series E, Series F and Series G Convertible Preferred Stock automatically converted into Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F3 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2009, L.P. ("BCV Partners 2009"), which is the general partner of Bain Capital Venture Fund 2009, L.P. ("BCV Fund 2009"). As a result, BCV Partners 2009 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2009. BCV Partners 2009 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: (Continued from footnote 3) In the Conversion, the 3,808,891 shares of Seed Series Convertible Preferred Stock, 1,636,386 shares of Series A Convertible Preferred Stock, 326,711 shares of Series C Convertible Preferred Stock, 348,609 shares of Series D Convertible Preferred Stock, 485,582 shares of Series E Convertible Preferred Stock, 492,291 shares of Series F Convertible Preferred Stock and 119,445 shares of Series G Convertible Preferred Stock held by BCV Fund 2009 automatically converted into an aggregate of 7,217,915 shares of Common Stock. Following the Conversion, BCV Fund 2009 held 7,644,627 shares of Common Stock, which were automatically reclassified into 7,644,627 shares of Class A Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 151,354 shares of Seed Series Convertible Preferred Stock, 41,336 shares of Series A Convertible Preferred Stock, 40,712 shares of Series C Convertible Preferred Stock, 43,440 shares of Series D Convertible Preferred Stock, 60,508 shares of Series E Convertible Preferred Stock, 61,344 shares of Series F Convertible Preferred Stock and 14,884 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into an aggregate of 413,578 shares of Common Stock. Following the Conversion, BCIP Venture held 466,750 shares of Common Stock, which were automatically reclassified into 466,750 shares of Class A Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 31,755 shares of Seed Series Convertible Preferred Stock, 13,453 shares of Series A Convertible Preferred Stock, 2,946 shares of Series C Convertible Preferred Stock, 3,144 shares of Series D Convertible Preferred Stock, 4,379 shares of Series E Convertible Preferred Stock, 4,439 shares of Series F Convertible Preferred Stock and 1,077 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2009 and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into an aggregate of 61,193 shares of Common Stock. Following the Conversion, BCIP Venture-B held 65,041 shares of Common Stock, which were automatically reclassified into 65,041 shares of Class A Common Stock in the Reclassification.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-042573 · doc4.xml · nonDerivative · entry 3

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2009, L.P. · CIK 0001512988 · 10% owner

Bain Capital Venture Partners 2009, L.P. · CIK 0001512989 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 6,537,276

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Seed Series, Series A, Series C, Series D, Series E, Series F and Series G Convertible Preferred Stock automatically converted into Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F3 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2009, L.P. ("BCV Partners 2009"), which is the general partner of Bain Capital Venture Fund 2009, L.P. ("BCV Fund 2009"). As a result, BCV Partners 2009 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2009. BCV Partners 2009 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: (Continued from footnote 3) In the Conversion, the 3,808,891 shares of Seed Series Convertible Preferred Stock, 1,636,386 shares of Series A Convertible Preferred Stock, 326,711 shares of Series C Convertible Preferred Stock, 348,609 shares of Series D Convertible Preferred Stock, 485,582 shares of Series E Convertible Preferred Stock, 492,291 shares of Series F Convertible Preferred Stock and 119,445 shares of Series G Convertible Preferred Stock held by BCV Fund 2009 automatically converted into an aggregate of 7,217,915 shares of Common Stock. Following the Conversion, BCV Fund 2009 held 7,644,627 shares of Common Stock, which were automatically reclassified into 7,644,627 shares of Class A Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 151,354 shares of Seed Series Convertible Preferred Stock, 41,336 shares of Series A Convertible Preferred Stock, 40,712 shares of Series C Convertible Preferred Stock, 43,440 shares of Series D Convertible Preferred Stock, 60,508 shares of Series E Convertible Preferred Stock, 61,344 shares of Series F Convertible Preferred Stock and 14,884 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into an aggregate of 413,578 shares of Common Stock. Following the Conversion, BCIP Venture held 466,750 shares of Common Stock, which were automatically reclassified into 466,750 shares of Class A Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 31,755 shares of Seed Series Convertible Preferred Stock, 13,453 shares of Series A Convertible Preferred Stock, 2,946 shares of Series C Convertible Preferred Stock, 3,144 shares of Series D Convertible Preferred Stock, 4,379 shares of Series E Convertible Preferred Stock, 4,439 shares of Series F Convertible Preferred Stock and 1,077 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2009 and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into an aggregate of 61,193 shares of Common Stock. Following the Conversion, BCIP Venture-B held 65,041 shares of Common Stock, which were automatically reclassified into 65,041 shares of Class A Common Stock in the Reclassification.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-042573 · doc4.xml · nonDerivative · entry 2

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2009, L.P. · CIK 0001512988 · 10% owner

Bain Capital Venture Partners 2009, L.P. · CIK 0001512989 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 6,166,907

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Seed Series, Series A, Series C, Series D, Series E, Series F and Series G Convertible Preferred Stock automatically converted into Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F3 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2009, L.P. ("BCV Partners 2009"), which is the general partner of Bain Capital Venture Fund 2009, L.P. ("BCV Fund 2009"). As a result, BCV Partners 2009 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2009. BCV Partners 2009 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: (Continued from footnote 3) In the Conversion, the 3,808,891 shares of Seed Series Convertible Preferred Stock, 1,636,386 shares of Series A Convertible Preferred Stock, 326,711 shares of Series C Convertible Preferred Stock, 348,609 shares of Series D Convertible Preferred Stock, 485,582 shares of Series E Convertible Preferred Stock, 492,291 shares of Series F Convertible Preferred Stock and 119,445 shares of Series G Convertible Preferred Stock held by BCV Fund 2009 automatically converted into an aggregate of 7,217,915 shares of Common Stock. Following the Conversion, BCV Fund 2009 held 7,644,627 shares of Common Stock, which were automatically reclassified into 7,644,627 shares of Class A Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 151,354 shares of Seed Series Convertible Preferred Stock, 41,336 shares of Series A Convertible Preferred Stock, 40,712 shares of Series C Convertible Preferred Stock, 43,440 shares of Series D Convertible Preferred Stock, 60,508 shares of Series E Convertible Preferred Stock, 61,344 shares of Series F Convertible Preferred Stock and 14,884 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into an aggregate of 413,578 shares of Common Stock. Following the Conversion, BCIP Venture held 466,750 shares of Common Stock, which were automatically reclassified into 466,750 shares of Class A Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 31,755 shares of Seed Series Convertible Preferred Stock, 13,453 shares of Series A Convertible Preferred Stock, 2,946 shares of Series C Convertible Preferred Stock, 3,144 shares of Series D Convertible Preferred Stock, 4,379 shares of Series E Convertible Preferred Stock, 4,439 shares of Series F Convertible Preferred Stock and 1,077 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2009 and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into an aggregate of 61,193 shares of Common Stock. Following the Conversion, BCIP Venture-B held 65,041 shares of Common Stock, which were automatically reclassified into 65,041 shares of Class A Common Stock in the Reclassification.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-042573 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2009, L.P. · CIK 0001512988 · 10% owner

Bain Capital Venture Partners 2009, L.P. · CIK 0001512989 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 4,475,732

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Seed Series, Series A, Series C, Series D, Series E, Series F and Series G Convertible Preferred Stock automatically converted into Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F3 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2009, L.P. ("BCV Partners 2009"), which is the general partner of Bain Capital Venture Fund 2009, L.P. ("BCV Fund 2009"). As a result, BCV Partners 2009 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2009. BCV Partners 2009 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: (Continued from footnote 3) In the Conversion, the 3,808,891 shares of Seed Series Convertible Preferred Stock, 1,636,386 shares of Series A Convertible Preferred Stock, 326,711 shares of Series C Convertible Preferred Stock, 348,609 shares of Series D Convertible Preferred Stock, 485,582 shares of Series E Convertible Preferred Stock, 492,291 shares of Series F Convertible Preferred Stock and 119,445 shares of Series G Convertible Preferred Stock held by BCV Fund 2009 automatically converted into an aggregate of 7,217,915 shares of Common Stock. Following the Conversion, BCV Fund 2009 held 7,644,627 shares of Common Stock, which were automatically reclassified into 7,644,627 shares of Class A Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 151,354 shares of Seed Series Convertible Preferred Stock, 41,336 shares of Series A Convertible Preferred Stock, 40,712 shares of Series C Convertible Preferred Stock, 43,440 shares of Series D Convertible Preferred Stock, 60,508 shares of Series E Convertible Preferred Stock, 61,344 shares of Series F Convertible Preferred Stock and 14,884 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into an aggregate of 413,578 shares of Common Stock. Following the Conversion, BCIP Venture held 466,750 shares of Common Stock, which were automatically reclassified into 466,750 shares of Class A Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 31,755 shares of Seed Series Convertible Preferred Stock, 13,453 shares of Series A Convertible Preferred Stock, 2,946 shares of Series C Convertible Preferred Stock, 3,144 shares of Series D Convertible Preferred Stock, 4,379 shares of Series E Convertible Preferred Stock, 4,439 shares of Series F Convertible Preferred Stock and 1,077 shares of Series G Convertible Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2009 and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into an aggregate of 61,193 shares of Common Stock. Following the Conversion, BCIP Venture-B held 65,041 shares of Common Stock, which were automatically reclassified into 65,041 shares of Class A Common Stock in the Reclassification.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-040680 · doc4.xml · derivative · entry 2

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE COINVESTMENT FUND, L.P. · CIK 0001609318 · 10% owner

Bain Capital Venture Coinvestment Partners, L.P. · CIK 0001767193 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

BCV AX Investors, L.P. · CIK 0001886184 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Common Stock · 23,383,240 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of Series E Preferred Stock automatically converted into four shares of Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F1 · price: Each share of Series E Preferred Stock automatically converted into four shares of Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F1 · derivative.exercise_date: Each share of Series E Preferred Stock automatically converted into four shares of Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F1 · derivative.expiration_date: Each share of Series E Preferred Stock automatically converted into four shares of Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2014, L.P. ("BCV Partners 2014"), which is the general partner of Bain Capital Venture Fund 2014, L.P. ("BCV Fund 2014"). As a result, BCV Partners 2014 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2014. BCV Partners 2014 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. In the Conversion, the 1,807,597 shares of Series E Preferred Stock held by BCV Fund 2014 automatically converted into 7,230,388 shares of Common Stock.

F3 · ownership.nature: BCVI is the general partner of Bain Capital Venture Coinvestment Partners, L.P. ("BCV Coinvest Partners"), which is the general partner of Bain Capital Venture Coinvestment Fund, L.P. ("BCV Coinvest Fund"). As a result, BCV Coinvest Partners may be deemed to share voting and dispositive power with respect to the securities held by BCV Coinvest Fund. BCV Coinvest Partners disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. In the Conversion, the 2,437,790 shares of Series E Preferred Stock held by BCV Coinvest Fund automatically converted into 9,751,160 shares of Common Stock.

F4 · ownership.nature: In the Conversion, the 1,113,487 shares of Series E Preferred Stock held by BCV AX Investors, L.P. ("BCV AX"), whose general partner is BCVI, automatically converted into 4,453,948 shares of Common Stock.

F5 · ownership.nature: In the Conversion, the 460,899 shares of Series E Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 1,843,596 shares of Common Stock.

F6 · ownership.nature: In the Conversion, the 26,037 shares of Series E Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2014, BCV Coinvest Fund, BCV AX and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into 104,148 shares of Common Stock.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-040680 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE COINVESTMENT FUND, L.P. · CIK 0001609318 · 10% owner

Bain Capital Venture Coinvestment Partners, L.P. · CIK 0001767193 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

BCV AX Investors, L.P. · CIK 0001886184 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 23,383,240

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Series E Preferred Stock automatically converted into four shares of Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). These shares had no expiration date.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2014, L.P. ("BCV Partners 2014"), which is the general partner of Bain Capital Venture Fund 2014, L.P. ("BCV Fund 2014"). As a result, BCV Partners 2014 may be deemed to share voting and dispositive power with respect to the securities held by BCV Fund 2014. BCV Partners 2014 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. In the Conversion, the 1,807,597 shares of Series E Preferred Stock held by BCV Fund 2014 automatically converted into 7,230,388 shares of Common Stock.

F3 · ownership.nature: BCVI is the general partner of Bain Capital Venture Coinvestment Partners, L.P. ("BCV Coinvest Partners"), which is the general partner of Bain Capital Venture Coinvestment Fund, L.P. ("BCV Coinvest Fund"). As a result, BCV Coinvest Partners may be deemed to share voting and dispositive power with respect to the securities held by BCV Coinvest Fund. BCV Coinvest Partners disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. In the Conversion, the 2,437,790 shares of Series E Preferred Stock held by BCV Coinvest Fund automatically converted into 9,751,160 shares of Common Stock.

F4 · ownership.nature: In the Conversion, the 1,113,487 shares of Series E Preferred Stock held by BCV AX Investors, L.P. ("BCV AX"), whose general partner is BCVI, automatically converted into 4,453,948 shares of Common Stock.

F5 · ownership.nature: In the Conversion, the 460,899 shares of Series E Preferred Stock held by BCIP Venture Associates ("BCIP Venture"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 1,843,596 shares of Common Stock.

F6 · ownership.nature: In the Conversion, the 26,037 shares of Series E Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2014, BCV Coinvest Fund, BCV AX and BCIP Venture, the "Bain Capital Venture Entities"), whose managing partner is Boylston, automatically converted into 104,148 shares of Common Stock.

F7 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, BCVI and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Venture Entities. BCVI and Messrs. Salem and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-21-027909 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Fund 2012, L.P. · CIK 0001540349 · 10% owner

Bain Capital Venture Partners 2012, L.P. · CIK 0001540350 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 28,367,064

F1 · ownership.nature: On July 6, 2021, each of Bain Capital Venture Fund 2012, L.P. ("BCV Fund 2012"), BCIP Venture Associates ("BCIP Venture") and BCIP Venture Associates-B ("BCIP Venture-B" and, together with BCV Fund 2012 and BCIP Venture, the "Bain Capital Venture Entities") sold 2,856,323, 278,960 and 16,612 shares of the Issuer's Class 1 Common Stock, respectively, in an underwritten public offering. Following such sale, BCV Fund 2012, BCIP Venture and BCIP Venture-B held 25,706,922, 2,510,636 and 149,506 shares of the Issuer's Class 1 Common Stock, respectively.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2012, L.P. ("BCV Partners 2012"), which is the general partner of BCV Fund 2012. Boylston Coinvestors, LLC is the managing partner of each of BCIP Venture and BCIP Venture-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal. As a result, each of BCVI, BCV Partners 2012 and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to the shares of the Issuer's Class 1 Common Stock held by the Bain Capital Venture Entities. Each of BCVI, BCV Partners 2012 and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-033544 · doc4.xml · derivative · entry 4

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Voting Common Stock · 190,500 shares

Expires not disclosed

F2 · kind: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before January 15, 2025. On June 21, 2021, each of Venture Fund 2016, BCIP Venture II and BCIP Venture II-B exercised warrants to purchase 171,882, 17,187 and 1,431 shares of the Issuer's Voting Common Stock, respectively (together with the transaction described in footnote 1 above, the "Warrant Exercises").

F2 · derivative.exercise_date: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before January 15, 2025. On June 21, 2021, each of Venture Fund 2016, BCIP Venture II and BCIP Venture II-B exercised warrants to purchase 171,882, 17,187 and 1,431 shares of the Issuer's Voting Common Stock, respectively (together with the transaction described in footnote 1 above, the "Warrant Exercises").

F2 · derivative.expiration_date: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before January 15, 2025. On June 21, 2021, each of Venture Fund 2016, BCIP Venture II and BCIP Venture II-B exercised warrants to purchase 171,882, 17,187 and 1,431 shares of the Issuer's Voting Common Stock, respectively (together with the transaction described in footnote 1 above, the "Warrant Exercises").

F3 · ownership.nature: Includes 13,573,035 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014"), 904,821 shares of the Issuer's Voting Common Stock held directly by Venture Fund 2016, 1,383,753 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates ("BCIP Venture"), 93,096 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates-B ("BCIP Venture-B"), 134,475 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II, 10,140 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II-B, 423,600 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") and 16,944 shares of the Issuer's Voting Common Stock held directly by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and,

F4 · ownership.nature: (Continued from footnote 3) together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities"), in each case, after giving effect to the Warrant Exercises.

F5 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F6 · ownership.nature: (Continued From Footnote 5) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-033544 · doc4.xml · derivative · entry 3

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Voting Common Stock · 75,000 shares

Expires not disclosed

F1 · kind: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before August 22, 2022. On June 21, 2021, each of Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016"), BCIP Venture Associates II, LP ("BCIP Venture II") and BCIP Venture Associates II-B, LP ("BCIP Venture II-B") exercised warrants to purchase 67,668, 6,768 and 564 shares of the Issuer's Voting Common Stock, respectively.

F1 · derivative.exercise_date: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before August 22, 2022. On June 21, 2021, each of Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016"), BCIP Venture Associates II, LP ("BCIP Venture II") and BCIP Venture Associates II-B, LP ("BCIP Venture II-B") exercised warrants to purchase 67,668, 6,768 and 564 shares of the Issuer's Voting Common Stock, respectively.

F1 · derivative.expiration_date: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before August 22, 2022. On June 21, 2021, each of Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016"), BCIP Venture Associates II, LP ("BCIP Venture II") and BCIP Venture Associates II-B, LP ("BCIP Venture II-B") exercised warrants to purchase 67,668, 6,768 and 564 shares of the Issuer's Voting Common Stock, respectively.

F3 · ownership.nature: Includes 13,573,035 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014"), 904,821 shares of the Issuer's Voting Common Stock held directly by Venture Fund 2016, 1,383,753 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates ("BCIP Venture"), 93,096 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates-B ("BCIP Venture-B"), 134,475 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II, 10,140 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II-B, 423,600 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") and 16,944 shares of the Issuer's Voting Common Stock held directly by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and,

F4 · ownership.nature: (Continued from footnote 3) together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities"), in each case, after giving effect to the Warrant Exercises.

F5 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F6 · ownership.nature: (Continued From Footnote 5) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-033544 · doc4.xml · nonDerivative · entry 2

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 16,539,864

F2 · kind: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before January 15, 2025. On June 21, 2021, each of Venture Fund 2016, BCIP Venture II and BCIP Venture II-B exercised warrants to purchase 171,882, 17,187 and 1,431 shares of the Issuer's Voting Common Stock, respectively (together with the transaction described in footnote 1 above, the "Warrant Exercises").

F3 · ownership.nature: Includes 13,573,035 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014"), 904,821 shares of the Issuer's Voting Common Stock held directly by Venture Fund 2016, 1,383,753 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates ("BCIP Venture"), 93,096 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates-B ("BCIP Venture-B"), 134,475 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II, 10,140 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II-B, 423,600 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") and 16,944 shares of the Issuer's Voting Common Stock held directly by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and,

F4 · ownership.nature: (Continued from footnote 3) together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities"), in each case, after giving effect to the Warrant Exercises.

F5 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F6 · ownership.nature: (Continued From Footnote 5) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-033544 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 16,349,364

F1 · kind: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before August 22, 2022. On June 21, 2021, each of Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016"), BCIP Venture Associates II, LP ("BCIP Venture II") and BCIP Venture Associates II-B, LP ("BCIP Venture II-B") exercised warrants to purchase 67,668, 6,768 and 564 shares of the Issuer's Voting Common Stock, respectively.

F3 · ownership.nature: Includes 13,573,035 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014"), 904,821 shares of the Issuer's Voting Common Stock held directly by Venture Fund 2016, 1,383,753 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates ("BCIP Venture"), 93,096 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates-B ("BCIP Venture-B"), 134,475 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II, 10,140 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II-B, 423,600 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") and 16,944 shares of the Issuer's Voting Common Stock held directly by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and,

F4 · ownership.nature: (Continued from footnote 3) together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities"), in each case, after giving effect to the Warrant Exercises.

F5 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F6 · ownership.nature: (Continued From Footnote 5) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-033546 · doc4.xml · derivative · entry 4

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Voting Common Stock · 190,500 shares

Expires not disclosed

F2 · kind: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before January 15, 2025. On June 21, 2021, each of Venture Fund 2016, BCIP Venture II and BCIP Venture II-B exercised warrants to purchase 171,882, 17,187 and 1,431 shares of the Issuer's Voting Common Stock, respectively (together with the transaction described in footnote 1 above, the "Warrant Exercises").

F2 · derivative.exercise_date: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before January 15, 2025. On June 21, 2021, each of Venture Fund 2016, BCIP Venture II and BCIP Venture II-B exercised warrants to purchase 171,882, 17,187 and 1,431 shares of the Issuer's Voting Common Stock, respectively (together with the transaction described in footnote 1 above, the "Warrant Exercises").

F2 · derivative.expiration_date: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before January 15, 2025. On June 21, 2021, each of Venture Fund 2016, BCIP Venture II and BCIP Venture II-B exercised warrants to purchase 171,882, 17,187 and 1,431 shares of the Issuer's Voting Common Stock, respectively (together with the transaction described in footnote 1 above, the "Warrant Exercises").

F3 · ownership.nature: Includes 13,573,035 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014"), 904,821 shares of the Issuer's Voting Common Stock held directly by Venture Fund 2016, 1,383,753 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates ("BCIP Venture"), 93,096 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates-B ("BCIP Venture-B"), 134,475 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II, 10,140 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II-B, 423,600 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") and 16,944 shares of the Issuer's Voting Common Stock held directly by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and,

F4 · ownership.nature: (Continued from footnote 3) together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities"), in each case, after giving effect to the Warrant Exercises.

F5 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F6 · ownership.nature: (Continued From Footnote 5) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-033546 · doc4.xml · derivative · entry 3

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Voting Common Stock · 75,000 shares

Expires not disclosed

F1 · kind: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before August 22, 2022. On June 21, 2021, each of Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016"), BCIP Venture Associates II, LP ("BCIP Venture II") and BCIP Venture Associates II-B, LP ("BCIP Venture II-B") exercised warrants to purchase 67,668, 6,768 and 564 shares of the Issuer's Voting Common Stock, respectively.

F1 · derivative.exercise_date: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before August 22, 2022. On June 21, 2021, each of Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016"), BCIP Venture Associates II, LP ("BCIP Venture II") and BCIP Venture Associates II-B, LP ("BCIP Venture II-B") exercised warrants to purchase 67,668, 6,768 and 564 shares of the Issuer's Voting Common Stock, respectively.

F1 · derivative.expiration_date: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before August 22, 2022. On June 21, 2021, each of Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016"), BCIP Venture Associates II, LP ("BCIP Venture II") and BCIP Venture Associates II-B, LP ("BCIP Venture II-B") exercised warrants to purchase 67,668, 6,768 and 564 shares of the Issuer's Voting Common Stock, respectively.

F3 · ownership.nature: Includes 13,573,035 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014"), 904,821 shares of the Issuer's Voting Common Stock held directly by Venture Fund 2016, 1,383,753 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates ("BCIP Venture"), 93,096 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates-B ("BCIP Venture-B"), 134,475 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II, 10,140 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II-B, 423,600 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") and 16,944 shares of the Issuer's Voting Common Stock held directly by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and,

F4 · ownership.nature: (Continued from footnote 3) together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities"), in each case, after giving effect to the Warrant Exercises.

F5 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F6 · ownership.nature: (Continued From Footnote 5) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-033546 · doc4.xml · nonDerivative · entry 2

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 16,539,864

F2 · kind: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before January 15, 2025. On June 21, 2021, each of Venture Fund 2016, BCIP Venture II and BCIP Venture II-B exercised warrants to purchase 171,882, 17,187 and 1,431 shares of the Issuer's Voting Common Stock, respectively (together with the transaction described in footnote 1 above, the "Warrant Exercises").

F3 · ownership.nature: Includes 13,573,035 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014"), 904,821 shares of the Issuer's Voting Common Stock held directly by Venture Fund 2016, 1,383,753 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates ("BCIP Venture"), 93,096 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates-B ("BCIP Venture-B"), 134,475 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II, 10,140 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II-B, 423,600 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") and 16,944 shares of the Issuer's Voting Common Stock held directly by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and,

F4 · ownership.nature: (Continued from footnote 3) together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities"), in each case, after giving effect to the Warrant Exercises.

F5 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F6 · ownership.nature: (Continued From Footnote 5) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-033546 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 16,349,364

F1 · kind: Each warrant was exercisable by the holder in whole or in part at any time and from time to time on or before August 22, 2022. On June 21, 2021, each of Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016"), BCIP Venture Associates II, LP ("BCIP Venture II") and BCIP Venture Associates II-B, LP ("BCIP Venture II-B") exercised warrants to purchase 67,668, 6,768 and 564 shares of the Issuer's Voting Common Stock, respectively.

F3 · ownership.nature: Includes 13,573,035 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014"), 904,821 shares of the Issuer's Voting Common Stock held directly by Venture Fund 2016, 1,383,753 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates ("BCIP Venture"), 93,096 shares of the Issuer's Voting Common Stock held directly by BCIP Venture Associates-B ("BCIP Venture-B"), 134,475 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II, 10,140 shares of the Issuer's Voting Common Stock held directly by BCIP Venture II-B, 423,600 shares of the Issuer's Voting Common Stock held directly by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") and 16,944 shares of the Issuer's Voting Common Stock held directly by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and,

F4 · ownership.nature: (Continued from footnote 3) together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities"), in each case, after giving effect to the Warrant Exercises.

F5 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F6 · ownership.nature: (Continued From Footnote 5) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · derivative · entry 10

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock · 7,700,250 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.exercise_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.expiration_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · derivative · entry 9

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock · 166,437 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.exercise_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.expiration_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · derivative · entry 8

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock · 1,540,935 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.exercise_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.expiration_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · derivative · entry 7

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock · 554,376 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.exercise_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.expiration_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · nonDerivative · entry 6

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 16,274,364

F2 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of the Issuer's Class A Common Stock was reclassified into one share of the Issuer's Voting Common Stock following the Conversion and immediately prior to the closing of the Issuer's initial public offering (the "Reclassification").

F2 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of the Issuer's Class A Common Stock was reclassified into one share of the Issuer's Voting Common Stock following the Conversion and immediately prior to the closing of the Issuer's initial public offering (the "Reclassification").

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · nonDerivative · entry 5

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

F2 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of the Issuer's Class A Common Stock was reclassified into one share of the Issuer's Voting Common Stock following the Conversion and immediately prior to the closing of the Issuer's initial public offering (the "Reclassification").

F2 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of the Issuer's Class A Common Stock was reclassified into one share of the Issuer's Voting Common Stock following the Conversion and immediately prior to the closing of the Issuer's initial public offering (the "Reclassification").

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · nonDerivative · entry 4

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 16,274,364

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · nonDerivative · entry 3

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 8,574,114

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · nonDerivative · entry 2

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 8,407,677

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021452 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Coinvestment Fund II, L.P. · CIK 0001756820 · 10% owner

BCV 2019-MD Coinvestment II, L.P. · CIK 0001758683 · 10% owner

Bain Capital Venture Coinvestment II Investors, LLC · CIK 0001862142 · 10% owner

BAIN CAPITAL VENTURE FUND 2014, L.P. · CIK 0001609330 · 10% owner

Bain Capital Venture Partners 2014, L.P. · CIK 0001767194 · 10% owner

Bain Capital Venture Fund 2016, L.P. · CIK 0001678394 · 10% owner

Bain Capital Venture Partners 2016, L.P. · CIK 0001862138 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 6,866,742

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · derivative · entry 10

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock · 7,700,250 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.exercise_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.expiration_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · derivative · entry 9

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock · 166,437 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.exercise_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.expiration_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · derivative · entry 8

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock · 1,540,935 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.exercise_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.expiration_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · derivative · entry 7

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

Underlying: Class A Common Stock · 554,376 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.exercise_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F1 · derivative.expiration_date: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · nonDerivative · entry 6

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 16,274,364

F2 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of the Issuer's Class A Common Stock was reclassified into one share of the Issuer's Voting Common Stock following the Conversion and immediately prior to the closing of the Issuer's initial public offering (the "Reclassification").

F2 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of the Issuer's Class A Common Stock was reclassified into one share of the Issuer's Voting Common Stock following the Conversion and immediately prior to the closing of the Issuer's initial public offering (the "Reclassification").

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · nonDerivative · entry 5

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 0

F2 · kind: Pursuant to a reclassification exempt under Rule 16b-7, each share of the Issuer's Class A Common Stock was reclassified into one share of the Issuer's Voting Common Stock following the Conversion and immediately prior to the closing of the Issuer's initial public offering (the "Reclassification").

F2 · price: Pursuant to a reclassification exempt under Rule 16b-7, each share of the Issuer's Class A Common Stock was reclassified into one share of the Issuer's Voting Common Stock following the Conversion and immediately prior to the closing of the Issuer's initial public offering (the "Reclassification").

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · nonDerivative · entry 4

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 16,274,364

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · nonDerivative · entry 3

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 8,574,114

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · nonDerivative · entry 2

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 8,407,677

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-021456 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BCIP Venture Associates II, L.P. · CIK 0001859026 · 10% owner

BCIP Venture Associates II-B, LP · CIK 0001859012 · 10% owner

Salem Enrique T · CIK 0001295402 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 6,866,742

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of the Issuer's Series A, Series B, Series B-1 and Series C Preferred Stock automatically converted into one share of the Issuer's Class A Common Stock immediately prior to the closing of the Issuer's initial public offering (the "Conversion"). The shares had no expiration date.

F3 · ownership.nature: In the Conversion, the 488,607 shares of Series A Preferred Stock, 915,603 shares of Series B Preferred Stock and 6,819,693 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2014, L.P. ("Venture Fund 2014") automatically converted into an aggregate of 8,223,903 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2014 held 13,573,035 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 13,573,035 shares of the Issuer's Voting Common Stock in the Reclassification.

F4 · ownership.nature: In the Conversion, the 11,376 shares of Series A Preferred Stock, 245,901 shares of Series B Preferred Stock and 64,047 shares of Series C Preferred Stock held by Bain Capital Venture Fund 2016, L.P. ("Venture Fund 2016") automatically converted into an aggregate of 321,324 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Fund 2016 held 665,271 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 665,271 shares of the Issuer's Voting Common Stock in the Reclassification.

F5 · ownership.nature: In the Conversion, the 49,803 shares of Series A Preferred Stock, 93,345 shares of Series B Preferred Stock and 695,265 shares of Series C Preferred Stock held by BCIP Venture Associates ("BCIP Venture") automatically converted into an aggregate of 838,413 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture held 1,383,753 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 1,383,753 shares of the Issuer's Voting Common Stock in the Reclassification.

F6 · ownership.nature: In the Conversion, the 3,357 shares of Series A Preferred Stock, 6,279 shares of Series B Preferred Stock and 46,773 shares of Series C Preferred Stock held by BCIP Venture Associates-B ("BCIP Venture-B") automatically converted into an aggregate of 56,409 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture-B held 93,096 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 93,096 shares of the Issuer's Voting Common Stock in the Reclassification.

F7 · ownership.nature: In the Conversion, the 1,137 shares of Series A Preferred Stock, 47,454 shares of Series B Preferred Stock, 15,030 shares of Series B-1 Preferred Stock and 12,504 shares of Series C Preferred Stock held by BCIP Venture Associates II, LP ("BCIP Venture II") automatically converted into an aggregate of 76,125 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II held 110,520 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 110,520 shares of the Issuer's Voting Common Stock in the Reclassification.

F8 · ownership.nature: In the Conversion, the 96 shares of Series A Preferred Stock, 3,402 shares of Series B Preferred Stock, 888 shares of Series B-1 Preferred Stock and 894 shares of Series C Preferred Stock held by BCIP Venture Associates II-B, LP ("BCIP Venture II-B") automatically converted into an aggregate of 5,280 shares of the Issuer's Class A Common Stock. Following the Conversion, BCIP Venture II-B held 8,145 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 8,145 shares of the Issuer's Voting Common Stock in the Reclassification.

F9 · ownership.nature: In the Conversion, the 220,146 shares of Series B Preferred Stock, 144,729 shares of Series B-1 Preferred Stock and 58,725 shares of Series C Preferred Stock held by Bain Capital Venture Coinvestment Fund II, L.P. ("Venture Coinvestment Fund II") automatically converted into an aggregate of 423,600 shares of the Issuer's Class A Common Stock. Following the Conversion, Venture Coinvestment Fund II held 423,600 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 423,600 shares of the Issuer's Voting Common Stock in the Reclassification.

F10 · ownership.nature: In the Conversion, the 8,805 shares of Series B Preferred Stock, 5,790 shares of Series B-1 Preferred Stock and 2,349 shares of Series C Preferred Stock held by BCV 2019-MD Coinvestment II, L.P. ("2019-MD Coinvestment II" and, together with Venture Fund 2014, Venture Fund 2016, BCIP Venture, BCIP Venture-B, BCIP Venture II, BCIP Venture II-B and Venture Coinvestment Fund II, the "Bain Capital Venture Entities") automatically converted into an aggregate of 16,944 shares of the Issuer's Class A Common Stock. Following the Conversion, 2019-MD Coinvestment II held 16,944 shares of the Issuer's Class A Common Stock, which were automatically reclassified into 16,944 shares of the Issuer's Voting Common Stock in the Reclassification.

F11 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is (i) the general partner of Bain Capital Venture Partners 2014, L.P. ("Venture Partners 2014"), which is the general partner of Venture Fund 2014, (ii) the general partner of Bain Capital Venture Partners 2016, L.P. ("Venture Partners 2016"), which is the general partner of Venture Fund 2016 and (iii) the manager of Bain Capital Venture Coinvestment II Investors, LLC ("Venture Coinvestment II Investors"), which is the general partner of each of Venture Coinvestment Fund II and 2019-MD Coinvestment II. Boylston Coinvestors, LLC is (i) the managing partner of each of BCIP Venture and BCIP Venture-B and (ii) the general partner of each of BCIP Venture II and BCIP Venture II-B. The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Venture Entities is directed by the Executive Committee of BCVI, which consists of Enrique Salem and Ajay Agarwal.

F12 · ownership.nature: (Continued From Footnote 11) As a result, each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal may be deemed to share voting and dispositive power with respect to all of the securities held by the Bain Capital Venture Entities. Each of BCVI, Venture Partners 2014, Venture Partners 2016, Venture Coinvestment II Investors and Messrs. Salem and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-18-007952 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Partners 2007, L.P. · CIK 0001408678 · 10% owner

Bain Capital Venture Fund 2007, L.P. · CIK 0001408677 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 3,682,713

F1 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2007, L.P. ("Partners 2007"), which is the general partner of Bain Capital Venture Fund 2007, L.P. ("Fund 2007"). As a result, Partners 2007 may be deemed to share voting and dispositive power with respect to shares of Common Stock held by Fund 2007. Partners 2007 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. On March 16, 2018, Fund 2007 sold 874,122 shares of Common Stock. Following such sale Fund 2007 held 3,219,142 shares of Common Stock.

F2 · ownership.nature: On March 16, 2018, BCIP Venture Associates ("BCIP VA"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), sold 124,324 shares of Common Stock. Following such sale BCIP VA held 457,848 shares of Common Stock.

F3 · ownership.nature: On March 16, 2018, BCIP Venture Associates-B ("BCIP VA-B" and together with Fund 2007, and BCIP VA, the "Bain Capital Entities"), whose managing partner is Boylston, sold 1,554 shares of Common Stock. Following such sale BCIP VA-B held 5,723 shares of Common Stock.

F4 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by the Bain Capital Entities. Each of BCVI and Messrs. Krupka and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-18-002394 · doc4.xml · nonDerivative · entry 1

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

Bain Capital Venture Partners 2007, L.P. · CIK 0001408678 · 10% owner

Bain Capital Venture Fund 2007, L.P. · CIK 0001408677 · 10% owner

BCIP Venture Associates · CIK 0001408649 · 10% owner

BCIP VENTURE ASSOCIATES-B · CIK 0001408676 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 4,682,713

F1 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2007, L.P. ("Partners 2007"), which is the general partner of Bain Capital Venture Fund 2007, L.P. ("Fund 2007"). As a result, Partners 2007 may be deemed to share voting and dispositive power with respect to shares of Common Stock held by Fund 2007. Partners 2007 disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. On January 30, 2018, Fund 2007 sold 1,748,245 shares of Common Stock. Following such sale Fund 2007 held 4,093,264 shares of Common Stock.

F2 · ownership.nature: On January 30, 2018, BCIP Venture Associates ("BCIP VA"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), sold 248,648 shares of Common Stock. Following such sale BCIP VA held 582,172 shares of Common Stock.

F3 · ownership.nature: On January 30, 2018, BCIP Venture Associates-B ("BCIP VA-B" and together with Fund 2007, and BCIP VA, the "Bain Capital Entities"), whose managing partner is Boylston, sold 3,107 shares of Common Stock. Following such sale BCIP VA-B held 7,277 shares of Common Stock.

F4 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by the Bain Capital Entities. Each of BCVI and Messrs. Krupka and Agarwal disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-17-028491 · doc4.xml · derivative · entry 10

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE PARTNERS 2005, L.P. · CIK 0001309470 · 10% owner

BAIN CAPITAL VENTURE FUND 2005, L.P. · CIK 0001309471 · 10% owner

BCIP Associates III, LLC · CIK 0001379475 · 10% owner

BCIP Associates III · CIK 0001379476 · 10% owner

BCIP Associates III-B, LLC · CIK 0001379517 · 10% owner

BCIP Associates III-B · CIK 0001379519 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 125,900 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F1 · price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F6 · derivative.exercise_date: These shares were convertible into the Issuer's common stock in accordance with the Issuer's Restated Certificate of Incorporation, as amended, at any time after the issuance of such shares, at the holder's election.

F7 · derivative.expiration_date: Not applicable.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2005, L.P. ("BCVP"), which is the general partner of Bain Capital Venture Fund 2005, L.P. ("Fund 2005"). As a result, BCVP may be deemed to share voting and dispositive power with respect to the securities held by Fund 2005. BCVP disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 1,106,387 shares of the Issuer's Series A-1 Preferred Stock, 2,904,268 shares of the Issuer's Series A-2 Preferred Stock, 1,325,258 shares of the Issuer's Series B Preferred Stock, 304,948 shares of the Issuer's Series C Preferred Stock and 353,283 shares of the Issuer's Series D Preferred Stock held by Fund 2005 automatically converted into 344,239, 903,630, 412,339, 94,881 and 109,921 shares of the Issuer's common stock, respectively.

F3 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 157,639 shares of the Issuer's Series A-1 Preferred Stock, 413,802 shares of the Issuer's Series A-2 Preferred Stock, 188,823 shares of the Issuer's Series B Preferred Stock, 43,449 shares of the Issuer's Series C Preferred Stock and 50,336 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III, LLC ("BCIP III"), whose manager is BCIP Associates III ("BCIPA III"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 49,047, 128,749, 58,750, 13,518 and 15,663 shares of the Issuer's common stock, respectively. BCIPA III may be deemed to share voting and dispositive power with respect to the securities held by BCIP III. BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 3,174 shares of the Issuer's Series A-1 Preferred Stock, 8,331 shares of the Issuer's Series A-2 Preferred Stock, 3,799 shares of the Issuer's Series B Preferred Stock, 874 shares of the Issuer's Series C Preferred Stock and 1,013 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III-B, LLC ("BCIP III-B" and together with Fund 2005 and BCIP III, the "Bain Capital Entities"), whose manager is BCIP Associates III-B ("BCIPA III-B"), whose managing partner is Boylston, automatically converted into 987, 2,592, 1,182, 271 and 316 shares of the Issuer's common stock, respectively. BCIPA III-B may be deemed to share voting and dispositive power with respect to the securities held by BCIP III-B. BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F5 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Entities. BCVI and Messrs. Krupka and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-17-028491 · doc4.xml · derivative · entry 9

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE PARTNERS 2005, L.P. · CIK 0001309470 · 10% owner

BAIN CAPITAL VENTURE FUND 2005, L.P. · CIK 0001309471 · 10% owner

BCIP Associates III, LLC · CIK 0001379475 · 10% owner

BCIP Associates III · CIK 0001379476 · 10% owner

BCIP Associates III-B, LLC · CIK 0001379517 · 10% owner

BCIP Associates III-B · CIK 0001379519 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 108,670 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F1 · price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F6 · derivative.exercise_date: These shares were convertible into the Issuer's common stock in accordance with the Issuer's Restated Certificate of Incorporation, as amended, at any time after the issuance of such shares, at the holder's election.

F7 · derivative.expiration_date: Not applicable.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2005, L.P. ("BCVP"), which is the general partner of Bain Capital Venture Fund 2005, L.P. ("Fund 2005"). As a result, BCVP may be deemed to share voting and dispositive power with respect to the securities held by Fund 2005. BCVP disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 1,106,387 shares of the Issuer's Series A-1 Preferred Stock, 2,904,268 shares of the Issuer's Series A-2 Preferred Stock, 1,325,258 shares of the Issuer's Series B Preferred Stock, 304,948 shares of the Issuer's Series C Preferred Stock and 353,283 shares of the Issuer's Series D Preferred Stock held by Fund 2005 automatically converted into 344,239, 903,630, 412,339, 94,881 and 109,921 shares of the Issuer's common stock, respectively.

F3 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 157,639 shares of the Issuer's Series A-1 Preferred Stock, 413,802 shares of the Issuer's Series A-2 Preferred Stock, 188,823 shares of the Issuer's Series B Preferred Stock, 43,449 shares of the Issuer's Series C Preferred Stock and 50,336 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III, LLC ("BCIP III"), whose manager is BCIP Associates III ("BCIPA III"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 49,047, 128,749, 58,750, 13,518 and 15,663 shares of the Issuer's common stock, respectively. BCIPA III may be deemed to share voting and dispositive power with respect to the securities held by BCIP III. BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 3,174 shares of the Issuer's Series A-1 Preferred Stock, 8,331 shares of the Issuer's Series A-2 Preferred Stock, 3,799 shares of the Issuer's Series B Preferred Stock, 874 shares of the Issuer's Series C Preferred Stock and 1,013 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III-B, LLC ("BCIP III-B" and together with Fund 2005 and BCIP III, the "Bain Capital Entities"), whose manager is BCIP Associates III-B ("BCIPA III-B"), whose managing partner is Boylston, automatically converted into 987, 2,592, 1,182, 271 and 316 shares of the Issuer's common stock, respectively. BCIPA III-B may be deemed to share voting and dispositive power with respect to the securities held by BCIP III-B. BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F5 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Entities. BCVI and Messrs. Krupka and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-17-028491 · doc4.xml · derivative · entry 8

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE PARTNERS 2005, L.P. · CIK 0001309470 · 10% owner

BAIN CAPITAL VENTURE FUND 2005, L.P. · CIK 0001309471 · 10% owner

BCIP Associates III, LLC · CIK 0001379475 · 10% owner

BCIP Associates III · CIK 0001379476 · 10% owner

BCIP Associates III-B, LLC · CIK 0001379517 · 10% owner

BCIP Associates III-B · CIK 0001379519 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 472,271 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F1 · price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F6 · derivative.exercise_date: These shares were convertible into the Issuer's common stock in accordance with the Issuer's Restated Certificate of Incorporation, as amended, at any time after the issuance of such shares, at the holder's election.

F7 · derivative.expiration_date: Not applicable.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2005, L.P. ("BCVP"), which is the general partner of Bain Capital Venture Fund 2005, L.P. ("Fund 2005"). As a result, BCVP may be deemed to share voting and dispositive power with respect to the securities held by Fund 2005. BCVP disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 1,106,387 shares of the Issuer's Series A-1 Preferred Stock, 2,904,268 shares of the Issuer's Series A-2 Preferred Stock, 1,325,258 shares of the Issuer's Series B Preferred Stock, 304,948 shares of the Issuer's Series C Preferred Stock and 353,283 shares of the Issuer's Series D Preferred Stock held by Fund 2005 automatically converted into 344,239, 903,630, 412,339, 94,881 and 109,921 shares of the Issuer's common stock, respectively.

F3 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 157,639 shares of the Issuer's Series A-1 Preferred Stock, 413,802 shares of the Issuer's Series A-2 Preferred Stock, 188,823 shares of the Issuer's Series B Preferred Stock, 43,449 shares of the Issuer's Series C Preferred Stock and 50,336 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III, LLC ("BCIP III"), whose manager is BCIP Associates III ("BCIPA III"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 49,047, 128,749, 58,750, 13,518 and 15,663 shares of the Issuer's common stock, respectively. BCIPA III may be deemed to share voting and dispositive power with respect to the securities held by BCIP III. BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 3,174 shares of the Issuer's Series A-1 Preferred Stock, 8,331 shares of the Issuer's Series A-2 Preferred Stock, 3,799 shares of the Issuer's Series B Preferred Stock, 874 shares of the Issuer's Series C Preferred Stock and 1,013 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III-B, LLC ("BCIP III-B" and together with Fund 2005 and BCIP III, the "Bain Capital Entities"), whose manager is BCIP Associates III-B ("BCIPA III-B"), whose managing partner is Boylston, automatically converted into 987, 2,592, 1,182, 271 and 316 shares of the Issuer's common stock, respectively. BCIPA III-B may be deemed to share voting and dispositive power with respect to the securities held by BCIP III-B. BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F5 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Entities. BCVI and Messrs. Krupka and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-17-028491 · doc4.xml · derivative · entry 7

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE PARTNERS 2005, L.P. · CIK 0001309470 · 10% owner

BAIN CAPITAL VENTURE FUND 2005, L.P. · CIK 0001309471 · 10% owner

BCIP Associates III, LLC · CIK 0001379475 · 10% owner

BCIP Associates III · CIK 0001379476 · 10% owner

BCIP Associates III-B, LLC · CIK 0001379517 · 10% owner

BCIP Associates III-B · CIK 0001379519 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 1,034,971 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F1 · price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F6 · derivative.exercise_date: These shares were convertible into the Issuer's common stock in accordance with the Issuer's Restated Certificate of Incorporation, as amended, at any time after the issuance of such shares, at the holder's election.

F7 · derivative.expiration_date: Not applicable.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2005, L.P. ("BCVP"), which is the general partner of Bain Capital Venture Fund 2005, L.P. ("Fund 2005"). As a result, BCVP may be deemed to share voting and dispositive power with respect to the securities held by Fund 2005. BCVP disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 1,106,387 shares of the Issuer's Series A-1 Preferred Stock, 2,904,268 shares of the Issuer's Series A-2 Preferred Stock, 1,325,258 shares of the Issuer's Series B Preferred Stock, 304,948 shares of the Issuer's Series C Preferred Stock and 353,283 shares of the Issuer's Series D Preferred Stock held by Fund 2005 automatically converted into 344,239, 903,630, 412,339, 94,881 and 109,921 shares of the Issuer's common stock, respectively.

F3 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 157,639 shares of the Issuer's Series A-1 Preferred Stock, 413,802 shares of the Issuer's Series A-2 Preferred Stock, 188,823 shares of the Issuer's Series B Preferred Stock, 43,449 shares of the Issuer's Series C Preferred Stock and 50,336 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III, LLC ("BCIP III"), whose manager is BCIP Associates III ("BCIPA III"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 49,047, 128,749, 58,750, 13,518 and 15,663 shares of the Issuer's common stock, respectively. BCIPA III may be deemed to share voting and dispositive power with respect to the securities held by BCIP III. BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 3,174 shares of the Issuer's Series A-1 Preferred Stock, 8,331 shares of the Issuer's Series A-2 Preferred Stock, 3,799 shares of the Issuer's Series B Preferred Stock, 874 shares of the Issuer's Series C Preferred Stock and 1,013 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III-B, LLC ("BCIP III-B" and together with Fund 2005 and BCIP III, the "Bain Capital Entities"), whose manager is BCIP Associates III-B ("BCIPA III-B"), whose managing partner is Boylston, automatically converted into 987, 2,592, 1,182, 271 and 316 shares of the Issuer's common stock, respectively. BCIPA III-B may be deemed to share voting and dispositive power with respect to the securities held by BCIP III-B. BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F5 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Entities. BCVI and Messrs. Krupka and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-17-028491 · doc4.xml · derivative · entry 6

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE PARTNERS 2005, L.P. · CIK 0001309470 · 10% owner

BAIN CAPITAL VENTURE FUND 2005, L.P. · CIK 0001309471 · 10% owner

BCIP Associates III, LLC · CIK 0001379475 · 10% owner

BCIP Associates III · CIK 0001379476 · 10% owner

BCIP Associates III-B, LLC · CIK 0001379517 · 10% owner

BCIP Associates III-B · CIK 0001379519 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 394,273 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F1 · price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F6 · derivative.exercise_date: These shares were convertible into the Issuer's common stock in accordance with the Issuer's Restated Certificate of Incorporation, as amended, at any time after the issuance of such shares, at the holder's election.

F7 · derivative.expiration_date: Not applicable.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2005, L.P. ("BCVP"), which is the general partner of Bain Capital Venture Fund 2005, L.P. ("Fund 2005"). As a result, BCVP may be deemed to share voting and dispositive power with respect to the securities held by Fund 2005. BCVP disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 1,106,387 shares of the Issuer's Series A-1 Preferred Stock, 2,904,268 shares of the Issuer's Series A-2 Preferred Stock, 1,325,258 shares of the Issuer's Series B Preferred Stock, 304,948 shares of the Issuer's Series C Preferred Stock and 353,283 shares of the Issuer's Series D Preferred Stock held by Fund 2005 automatically converted into 344,239, 903,630, 412,339, 94,881 and 109,921 shares of the Issuer's common stock, respectively.

F3 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 157,639 shares of the Issuer's Series A-1 Preferred Stock, 413,802 shares of the Issuer's Series A-2 Preferred Stock, 188,823 shares of the Issuer's Series B Preferred Stock, 43,449 shares of the Issuer's Series C Preferred Stock and 50,336 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III, LLC ("BCIP III"), whose manager is BCIP Associates III ("BCIPA III"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 49,047, 128,749, 58,750, 13,518 and 15,663 shares of the Issuer's common stock, respectively. BCIPA III may be deemed to share voting and dispositive power with respect to the securities held by BCIP III. BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 3,174 shares of the Issuer's Series A-1 Preferred Stock, 8,331 shares of the Issuer's Series A-2 Preferred Stock, 3,799 shares of the Issuer's Series B Preferred Stock, 874 shares of the Issuer's Series C Preferred Stock and 1,013 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III-B, LLC ("BCIP III-B" and together with Fund 2005 and BCIP III, the "Bain Capital Entities"), whose manager is BCIP Associates III-B ("BCIPA III-B"), whose managing partner is Boylston, automatically converted into 987, 2,592, 1,182, 271 and 316 shares of the Issuer's common stock, respectively. BCIPA III-B may be deemed to share voting and dispositive power with respect to the securities held by BCIP III-B. BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F5 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Entities. BCVI and Messrs. Krupka and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-17-028491 · doc4.xml · nonDerivative · entry 5

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE PARTNERS 2005, L.P. · CIK 0001309470 · 10% owner

BAIN CAPITAL VENTURE FUND 2005, L.P. · CIK 0001309471 · 10% owner

BCIP Associates III, LLC · CIK 0001379475 · 10% owner

BCIP Associates III · CIK 0001379476 · 10% owner

BCIP Associates III-B, LLC · CIK 0001379517 · 10% owner

BCIP Associates III-B · CIK 0001379519 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 2,136,085

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2005, L.P. ("BCVP"), which is the general partner of Bain Capital Venture Fund 2005, L.P. ("Fund 2005"). As a result, BCVP may be deemed to share voting and dispositive power with respect to the securities held by Fund 2005. BCVP disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 1,106,387 shares of the Issuer's Series A-1 Preferred Stock, 2,904,268 shares of the Issuer's Series A-2 Preferred Stock, 1,325,258 shares of the Issuer's Series B Preferred Stock, 304,948 shares of the Issuer's Series C Preferred Stock and 353,283 shares of the Issuer's Series D Preferred Stock held by Fund 2005 automatically converted into 344,239, 903,630, 412,339, 94,881 and 109,921 shares of the Issuer's common stock, respectively.

F3 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 157,639 shares of the Issuer's Series A-1 Preferred Stock, 413,802 shares of the Issuer's Series A-2 Preferred Stock, 188,823 shares of the Issuer's Series B Preferred Stock, 43,449 shares of the Issuer's Series C Preferred Stock and 50,336 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III, LLC ("BCIP III"), whose manager is BCIP Associates III ("BCIPA III"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 49,047, 128,749, 58,750, 13,518 and 15,663 shares of the Issuer's common stock, respectively. BCIPA III may be deemed to share voting and dispositive power with respect to the securities held by BCIP III. BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 3,174 shares of the Issuer's Series A-1 Preferred Stock, 8,331 shares of the Issuer's Series A-2 Preferred Stock, 3,799 shares of the Issuer's Series B Preferred Stock, 874 shares of the Issuer's Series C Preferred Stock and 1,013 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III-B, LLC ("BCIP III-B" and together with Fund 2005 and BCIP III, the "Bain Capital Entities"), whose manager is BCIP Associates III-B ("BCIPA III-B"), whose managing partner is Boylston, automatically converted into 987, 2,592, 1,182, 271 and 316 shares of the Issuer's common stock, respectively. BCIPA III-B may be deemed to share voting and dispositive power with respect to the securities held by BCIP III-B. BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F5 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Entities. BCVI and Messrs. Krupka and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-17-028491 · doc4.xml · nonDerivative · entry 4

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE PARTNERS 2005, L.P. · CIK 0001309470 · 10% owner

BAIN CAPITAL VENTURE FUND 2005, L.P. · CIK 0001309471 · 10% owner

BCIP Associates III, LLC · CIK 0001379475 · 10% owner

BCIP Associates III · CIK 0001379476 · 10% owner

BCIP Associates III-B, LLC · CIK 0001379517 · 10% owner

BCIP Associates III-B · CIK 0001379519 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 2,010,185

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2005, L.P. ("BCVP"), which is the general partner of Bain Capital Venture Fund 2005, L.P. ("Fund 2005"). As a result, BCVP may be deemed to share voting and dispositive power with respect to the securities held by Fund 2005. BCVP disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 1,106,387 shares of the Issuer's Series A-1 Preferred Stock, 2,904,268 shares of the Issuer's Series A-2 Preferred Stock, 1,325,258 shares of the Issuer's Series B Preferred Stock, 304,948 shares of the Issuer's Series C Preferred Stock and 353,283 shares of the Issuer's Series D Preferred Stock held by Fund 2005 automatically converted into 344,239, 903,630, 412,339, 94,881 and 109,921 shares of the Issuer's common stock, respectively.

F3 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 157,639 shares of the Issuer's Series A-1 Preferred Stock, 413,802 shares of the Issuer's Series A-2 Preferred Stock, 188,823 shares of the Issuer's Series B Preferred Stock, 43,449 shares of the Issuer's Series C Preferred Stock and 50,336 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III, LLC ("BCIP III"), whose manager is BCIP Associates III ("BCIPA III"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 49,047, 128,749, 58,750, 13,518 and 15,663 shares of the Issuer's common stock, respectively. BCIPA III may be deemed to share voting and dispositive power with respect to the securities held by BCIP III. BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 3,174 shares of the Issuer's Series A-1 Preferred Stock, 8,331 shares of the Issuer's Series A-2 Preferred Stock, 3,799 shares of the Issuer's Series B Preferred Stock, 874 shares of the Issuer's Series C Preferred Stock and 1,013 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III-B, LLC ("BCIP III-B" and together with Fund 2005 and BCIP III, the "Bain Capital Entities"), whose manager is BCIP Associates III-B ("BCIPA III-B"), whose managing partner is Boylston, automatically converted into 987, 2,592, 1,182, 271 and 316 shares of the Issuer's common stock, respectively. BCIPA III-B may be deemed to share voting and dispositive power with respect to the securities held by BCIP III-B. BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F5 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Entities. BCVI and Messrs. Krupka and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

SEC source: 0000899243-17-028491 · doc4.xml · nonDerivative · entry 3

BAIN CAPITAL VENTURE INVESTORS, LLC · CIK 0001309469 · 10% owner

BAIN CAPITAL VENTURE PARTNERS 2005, L.P. · CIK 0001309470 · 10% owner

BAIN CAPITAL VENTURE FUND 2005, L.P. · CIK 0001309471 · 10% owner

BCIP Associates III, LLC · CIK 0001379475 · 10% owner

BCIP Associates III · CIK 0001379476 · 10% owner

BCIP Associates III-B, LLC · CIK 0001379517 · 10% owner

BCIP Associates III-B · CIK 0001379519 · 10% owner

KRUPKA MICHAEL A · CIK 0001212150 · 10% owner

Agarwal Ajay · CIK 0001708763 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 1,901,515

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security.

F2 · ownership.nature: Bain Capital Venture Investors, LLC ("BCVI") is the general partner of Bain Capital Venture Partners 2005, L.P. ("BCVP"), which is the general partner of Bain Capital Venture Fund 2005, L.P. ("Fund 2005"). As a result, BCVP may be deemed to share voting and dispositive power with respect to the securities held by Fund 2005. BCVP disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein. Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 1,106,387 shares of the Issuer's Series A-1 Preferred Stock, 2,904,268 shares of the Issuer's Series A-2 Preferred Stock, 1,325,258 shares of the Issuer's Series B Preferred Stock, 304,948 shares of the Issuer's Series C Preferred Stock and 353,283 shares of the Issuer's Series D Preferred Stock held by Fund 2005 automatically converted into 344,239, 903,630, 412,339, 94,881 and 109,921 shares of the Issuer's common stock, respectively.

F3 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 157,639 shares of the Issuer's Series A-1 Preferred Stock, 413,802 shares of the Issuer's Series A-2 Preferred Stock, 188,823 shares of the Issuer's Series B Preferred Stock, 43,449 shares of the Issuer's Series C Preferred Stock and 50,336 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III, LLC ("BCIP III"), whose manager is BCIP Associates III ("BCIPA III"), whose managing partner is Boylston Coinvestors, LLC ("Boylston"), automatically converted into 49,047, 128,749, 58,750, 13,518 and 15,663 shares of the Issuer's common stock, respectively. BCIPA III may be deemed to share voting and dispositive power with respect to the securities held by BCIP III. BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F4 · ownership.nature: Immediately prior to the closing of the Issuer's initial public offering on December 11, 2017, the 3,174 shares of the Issuer's Series A-1 Preferred Stock, 8,331 shares of the Issuer's Series A-2 Preferred Stock, 3,799 shares of the Issuer's Series B Preferred Stock, 874 shares of the Issuer's Series C Preferred Stock and 1,013 shares of the Issuer's Series D Preferred Stock held by BCIP Associates III-B, LLC ("BCIP III-B" and together with Fund 2005 and BCIP III, the "Bain Capital Entities"), whose manager is BCIP Associates III-B ("BCIPA III-B"), whose managing partner is Boylston, automatically converted into 987, 2,592, 1,182, 271 and 316 shares of the Issuer's common stock, respectively. BCIPA III-B may be deemed to share voting and dispositive power with respect to the securities held by BCIP III-B. BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.

F5 · ownership.nature: The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Executive Committee of BCVI, which consists of Michael A. Krupka and Ajay Agarwal. As a result, BCVI and Messrs. Krupka and Agarwal may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Entities. BCVI and Messrs. Krupka and Agarwal disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.