TDUP

SEC source: 0001484778-21-000054 · wf-form4_162794869726339.xml · derivative · entry 3

MATTHEWS NORMAN S · CIK 0001178445 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 297,449

Underlying: Class A Common Stock · 85,449 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.

F3 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F3 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F3 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

SEC source: 0001484778-21-000054 · wf-form4_162794869726339.xml · nonDerivative · entry 2

MATTHEWS NORMAN S · CIK 0001178445 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,404

F2 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, the Reporting Person sold 85,449 shares of Class A Common Stock at a price per share of $23.1588 (after underwriting discounts and commissions). The Reporting Person was a selling stockholder in the registered public offering.

SEC source: 0001484778-21-000054 · wf-form4_162794869726339.xml · nonDerivative · entry 1

MATTHEWS NORMAN S · CIK 0001178445 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 96,853

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · derivative · entry 12

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV Ancillary, L.P.

Disclosed balance after: 285,749

Underlying: Class A Common Stock · 31,751 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · derivative · entry 11

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV L.P.

Disclosed balance after: 4,981,748

Underlying: Class A Common Stock · 553,526 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · derivative · entry 10

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth II, L.P.

Disclosed balance after: 2,314,091

Underlying: Class A Common Stock · 257,121 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · derivative · entry 9

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth I, L.P.

Disclosed balance after: 1,542,727

Underlying: Class A Common Stock · 171,414 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · nonDerivative · entry 8

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV Ancillary, L.P.

Disclosed balance after: 0

F3 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Upfront Growth I sold 171,414 shares of Class A Common Stock, Upfront Growth II sold 257,121 shares of Class A Common Stock, Upfront IV sold 553,526 shares of Class A Common Stock and Upfront IV Ancillary sold 31,751 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). The Upfront Entities were selling stockholders in the registered public offering.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · nonDerivative · entry 7

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV, L.P.

Disclosed balance after: 0

F3 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Upfront Growth I sold 171,414 shares of Class A Common Stock, Upfront Growth II sold 257,121 shares of Class A Common Stock, Upfront IV sold 553,526 shares of Class A Common Stock and Upfront IV Ancillary sold 31,751 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). The Upfront Entities were selling stockholders in the registered public offering.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · nonDerivative · entry 6

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth II, L.P.

Disclosed balance after: 0

F3 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Upfront Growth I sold 171,414 shares of Class A Common Stock, Upfront Growth II sold 257,121 shares of Class A Common Stock, Upfront IV sold 553,526 shares of Class A Common Stock and Upfront IV Ancillary sold 31,751 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). The Upfront Entities were selling stockholders in the registered public offering.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · nonDerivative · entry 5

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth I, L.P.

Disclosed balance after: 0

F3 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Upfront Growth I sold 171,414 shares of Class A Common Stock, Upfront Growth II sold 257,121 shares of Class A Common Stock, Upfront IV sold 553,526 shares of Class A Common Stock and Upfront IV Ancillary sold 31,751 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). The Upfront Entities were selling stockholders in the registered public offering.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · nonDerivative · entry 4

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV Ancillary, L.P.

Disclosed balance after: 31,751

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · nonDerivative · entry 3

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV, L.P.

Disclosed balance after: 553,526

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · nonDerivative · entry 2

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth II, L.P.

Disclosed balance after: 257,121

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000049 · wf-form4_162794649471098.xml · nonDerivative · entry 1

Upfront Ventures Management, LLC · CIK 0001852894 · 10% owner

Upfront Growth I, L.P. · CIK 0001852958 · 10% owner

Upfront Growth II, L.P. · CIK 0001852953 · 10% owner

Upfront IV Ancillary, L.P. · CIK 0001686789 · 10% owner

Upfront IV, L.P. · CIK 0001853198 · 10% owner

Upfront Growth GP I, LLC · CIK 0001852959 · 10% owner

Upfront Growth GP II, LLC · CIK 0001852954 · 10% owner

Upfront IV Ancillary GP, LLC · CIK 0001852952 · 10% owner

Upfront GP IV, L.P. · CIK 0001852962 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth I, L.P.

Disclosed balance after: 171,414

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC, which is controlled by Mark Suster and Yves Sisteron. Each of the Upfront Entities, their respective general partners, Upfront Ventures Management, LLC and Messrs. Suster and Sisteron disclaims beneficial ownership of the shares reported herein except to the extent of his or its respective pecuniary interest therein.

SEC source: 0001484778-21-000052 · wf-form4_162794824763106.xml · derivative · entry 9

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VIII Limited Partnership · CIK 0001554280 · 10% owner

Highland Capital Partners VIII Limited Partnership · CIK 0001467825 · 10% owner

Highland Capital Partners VIII-B Limited Partnership · CIK 0001467824 · 10% owner

Highland Capital Partners VIII-C Limited Partnership · CIK 0001467823 · 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: 1,640,248

Underlying: Class A Common Stock · 182,249 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.

F6 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F6 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F6 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · ownership.nature: These shares are held of record by Highland Capital Partners VIII-C Limited Partnership ("Highland Capital VIII-C"). HMP VIII Ltd is the general partner of HMP VIII LP, which is the general partner of Highland Capital VIII-C. The HMP VIII Ltd Directors are the directors of HMP VIII Ltd. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VIII-C and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors disclaims beneficial ownership over the shares held by Highland Capital VIII-C to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000052 · wf-form4_162794824763106.xml · derivative · entry 8

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VIII Limited Partnership · CIK 0001554280 · 10% owner

Highland Capital Partners VIII Limited Partnership · CIK 0001467825 · 10% owner

Highland Capital Partners VIII-B Limited Partnership · CIK 0001467824 · 10% owner

Highland Capital Partners VIII-C Limited Partnership · CIK 0001467823 · 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: 70,129

Underlying: Class A Common Stock · 7,793 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.

F6 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F6 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F6 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F3 · ownership.nature: These shares are held of record by Highland Capital Partners VIII-B Limited Partnership ("Highland Capital VIII-B"). HMP VIII Ltd is the general partner of HMP VIII LP, which is the general partner of Highland Capital VIII-B. The HMP VIII Ltd Directors are the directors of HMP VIII Ltd. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VIII-B and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors disclaims beneficial ownership over the shares held by Highland Capital VIII-B to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000052 · wf-form4_162794824763106.xml · derivative · entry 7

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VIII Limited Partnership · CIK 0001554280 · 10% owner

Highland Capital Partners VIII Limited Partnership · CIK 0001467825 · 10% owner

Highland Capital Partners VIII-B Limited Partnership · CIK 0001467824 · 10% owner

Highland Capital Partners VIII-C Limited Partnership · CIK 0001467823 · 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: 4,523,340

Underlying: Class A Common Stock · 502,594 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.

F6 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F6 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F6 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: These shares are held of record by Highland Capital Partners VIII Limited Partnership ("Highland Capital VIII"). Highland Management Partners VIII Limited ("HMP VIII Ltd") is the general partner of Highland Management Partners VIII Limited Partnership ("HMP VIII LP"), which is the general partner of Highland Capital VIII. Robert J. Davis, Paul A. Maeder, Corey M. Mulloy and Daniel J. Nova, a member of the Issuer's board of directors (collectively, the "HMP VIII Ltd Directors"), are the directors of HMP VIII Ltd. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VIII and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors disclaims beneficial ownership over the shares held by Highland Capital VIII to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000052 · wf-form4_162794824763106.xml · nonDerivative · entry 6

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VIII Limited Partnership · CIK 0001554280 · 10% owner

Highland Capital Partners VIII Limited Partnership · CIK 0001467825 · 10% owner

Highland Capital Partners VIII-B Limited Partnership · CIK 0001467824 · 10% owner

Highland Capital Partners VIII-C Limited Partnership · CIK 0001467823 · 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: 0

F5 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Highland Capital VIII sold 502,594 shares of Class A Common Stock, Highland Capital VIII-B sold 7,793 shares of Class A Common Stock and Highland Capital VIII-C sold 182,249 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). Highland Capital VIII, Highland Capital VIII-B and Highland Capital VIII-C were selling stockholders in the registered public offering.

F4 · ownership.nature: These shares are held of record by Highland Capital Partners VIII-C Limited Partnership ("Highland Capital VIII-C"). HMP VIII Ltd is the general partner of HMP VIII LP, which is the general partner of Highland Capital VIII-C. The HMP VIII Ltd Directors are the directors of HMP VIII Ltd. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VIII-C and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors disclaims beneficial ownership over the shares held by Highland Capital VIII-C to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000052 · wf-form4_162794824763106.xml · nonDerivative · entry 5

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VIII Limited Partnership · CIK 0001554280 · 10% owner

Highland Capital Partners VIII Limited Partnership · CIK 0001467825 · 10% owner

Highland Capital Partners VIII-B Limited Partnership · CIK 0001467824 · 10% owner

Highland Capital Partners VIII-C Limited Partnership · CIK 0001467823 · 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: 0

F5 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Highland Capital VIII sold 502,594 shares of Class A Common Stock, Highland Capital VIII-B sold 7,793 shares of Class A Common Stock and Highland Capital VIII-C sold 182,249 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). Highland Capital VIII, Highland Capital VIII-B and Highland Capital VIII-C were selling stockholders in the registered public offering.

F3 · ownership.nature: These shares are held of record by Highland Capital Partners VIII-B Limited Partnership ("Highland Capital VIII-B"). HMP VIII Ltd is the general partner of HMP VIII LP, which is the general partner of Highland Capital VIII-B. The HMP VIII Ltd Directors are the directors of HMP VIII Ltd. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VIII-B and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors disclaims beneficial ownership over the shares held by Highland Capital VIII-B to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000052 · wf-form4_162794824763106.xml · nonDerivative · entry 4

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VIII Limited Partnership · CIK 0001554280 · 10% owner

Highland Capital Partners VIII Limited Partnership · CIK 0001467825 · 10% owner

Highland Capital Partners VIII-B Limited Partnership · CIK 0001467824 · 10% owner

Highland Capital Partners VIII-C Limited Partnership · CIK 0001467823 · 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: 0

F5 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Highland Capital VIII sold 502,594 shares of Class A Common Stock, Highland Capital VIII-B sold 7,793 shares of Class A Common Stock and Highland Capital VIII-C sold 182,249 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). Highland Capital VIII, Highland Capital VIII-B and Highland Capital VIII-C were selling stockholders in the registered public offering.

F2 · ownership.nature: These shares are held of record by Highland Capital Partners VIII Limited Partnership ("Highland Capital VIII"). Highland Management Partners VIII Limited ("HMP VIII Ltd") is the general partner of Highland Management Partners VIII Limited Partnership ("HMP VIII LP"), which is the general partner of Highland Capital VIII. Robert J. Davis, Paul A. Maeder, Corey M. Mulloy and Daniel J. Nova, a member of the Issuer's board of directors (collectively, the "HMP VIII Ltd Directors"), are the directors of HMP VIII Ltd. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VIII and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors disclaims beneficial ownership over the shares held by Highland Capital VIII to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000052 · wf-form4_162794824763106.xml · nonDerivative · entry 3

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VIII Limited Partnership · CIK 0001554280 · 10% owner

Highland Capital Partners VIII Limited Partnership · CIK 0001467825 · 10% owner

Highland Capital Partners VIII-B Limited Partnership · CIK 0001467824 · 10% owner

Highland Capital Partners VIII-C Limited Partnership · CIK 0001467823 · 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: 182,249

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · ownership.nature: These shares are held of record by Highland Capital Partners VIII-C Limited Partnership ("Highland Capital VIII-C"). HMP VIII Ltd is the general partner of HMP VIII LP, which is the general partner of Highland Capital VIII-C. The HMP VIII Ltd Directors are the directors of HMP VIII Ltd. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VIII-C and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors disclaims beneficial ownership over the shares held by Highland Capital VIII-C to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000052 · wf-form4_162794824763106.xml · nonDerivative · entry 2

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VIII Limited Partnership · CIK 0001554280 · 10% owner

Highland Capital Partners VIII Limited Partnership · CIK 0001467825 · 10% owner

Highland Capital Partners VIII-B Limited Partnership · CIK 0001467824 · 10% owner

Highland Capital Partners VIII-C Limited Partnership · CIK 0001467823 · 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: 7,793

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F3 · ownership.nature: These shares are held of record by Highland Capital Partners VIII-B Limited Partnership ("Highland Capital VIII-B"). HMP VIII Ltd is the general partner of HMP VIII LP, which is the general partner of Highland Capital VIII-B. The HMP VIII Ltd Directors are the directors of HMP VIII Ltd. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VIII-B and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors disclaims beneficial ownership over the shares held by Highland Capital VIII-B to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000052 · wf-form4_162794824763106.xml · nonDerivative · entry 1

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VIII Limited Partnership · CIK 0001554280 · 10% owner

Highland Capital Partners VIII Limited Partnership · CIK 0001467825 · 10% owner

Highland Capital Partners VIII-B Limited Partnership · CIK 0001467824 · 10% owner

Highland Capital Partners VIII-C Limited Partnership · CIK 0001467823 · 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: 502,594

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: These shares are held of record by Highland Capital Partners VIII Limited Partnership ("Highland Capital VIII"). Highland Management Partners VIII Limited ("HMP VIII Ltd") is the general partner of Highland Management Partners VIII Limited Partnership ("HMP VIII LP"), which is the general partner of Highland Capital VIII. Robert J. Davis, Paul A. Maeder, Corey M. Mulloy and Daniel J. Nova, a member of the Issuer's board of directors (collectively, the "HMP VIII Ltd Directors"), are the directors of HMP VIII Ltd. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VIII and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VIII LP, HMP VIII Ltd and the HMP VIII Ltd Directors disclaims beneficial ownership over the shares held by Highland Capital VIII to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · derivative · entry 12

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 64,665

Underlying: Class A Common Stock · 7,185 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.

F7 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F7 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F7 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F5 · ownership.nature: These shares are held of record by Highland Entrepreneurs' Fund VII Limited Partnership ("Highland Entrepreneurs' Fund"). HMP VII LLC is the general partner of HMP VII LP, which is the general partner of Highland Entrepreneurs' Fund. The Managing Members are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Entrepreneurs' Fund and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Entrepreneurs' Fund to the extent of their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · derivative · entry 11

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 728,247

Underlying: Class A Common Stock · 80,916 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.

F7 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F7 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F7 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · ownership.nature: These shares are held of record by Highland Capital Partners VII-C Limited Partnership ("Highland Capital VII-C"). HMP VII LLC is the general partner of HMP VII LP, which is the general partner of Highland Capital VII-C. The Managing Members are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VII-C and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Capital VII-C to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · derivative · entry 10

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 500,062

Underlying: Class A Common Stock · 55,562 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.

F7 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F7 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F7 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F3 · ownership.nature: These shares are held of record by Highland Capital Partners VII-B Limited Partnership ("Highland Capital VII-B"). HMP VII LLC is the general partner of HMP VII LP, which is the general partner of Highland Capital VII-B. The Managing Members are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VII-B and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Capital VII-B to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · derivative · entry 9

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 2,063,647

Underlying: Class A Common Stock · 229,293 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.

F7 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F7 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F7 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: These shares are held of record by Highland Capital Partners VII Limited Partnership ("Highland Capital VII"). Highland Management Partners VII, LLC ("HMP VII LLC") is the general partner of Highland Management Partners VII Limited Partnership ("HMP VII LP"), which is the general partner of Highland Capital VII. Robert J. Davis, Paul A. Maeder, Corey M. Mulloy and Daniel J. Nova, a member of the Issuer's board of directors (collectively, the "Managing Members"), are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VII and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Capital VII to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · nonDerivative · entry 8

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 0

F6 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Highland Capital VII sold 229,293 shares of Class A Common Stock, Highland Capital VII-B sold 55,562 shares of Class A Common Stock, Highland Capital VII-C sold 80,916 shares of Class A Common Stock and Highland Entrepreneurs' Fund sold 7,185 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). Highland Capital VII, Highland Capital VII-B, Highland Capital VII-C and Highland Entrepreneurs' Fund were selling stockholders in the registered public offering.

F5 · ownership.nature: These shares are held of record by Highland Entrepreneurs' Fund VII Limited Partnership ("Highland Entrepreneurs' Fund"). HMP VII LLC is the general partner of HMP VII LP, which is the general partner of Highland Entrepreneurs' Fund. The Managing Members are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Entrepreneurs' Fund and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Entrepreneurs' Fund to the extent of their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · nonDerivative · entry 7

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 0

F6 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Highland Capital VII sold 229,293 shares of Class A Common Stock, Highland Capital VII-B sold 55,562 shares of Class A Common Stock, Highland Capital VII-C sold 80,916 shares of Class A Common Stock and Highland Entrepreneurs' Fund sold 7,185 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). Highland Capital VII, Highland Capital VII-B, Highland Capital VII-C and Highland Entrepreneurs' Fund were selling stockholders in the registered public offering.

F4 · ownership.nature: These shares are held of record by Highland Capital Partners VII-C Limited Partnership ("Highland Capital VII-C"). HMP VII LLC is the general partner of HMP VII LP, which is the general partner of Highland Capital VII-C. The Managing Members are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VII-C and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Capital VII-C to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · nonDerivative · entry 6

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 0

F6 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Highland Capital VII sold 229,293 shares of Class A Common Stock, Highland Capital VII-B sold 55,562 shares of Class A Common Stock, Highland Capital VII-C sold 80,916 shares of Class A Common Stock and Highland Entrepreneurs' Fund sold 7,185 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). Highland Capital VII, Highland Capital VII-B, Highland Capital VII-C and Highland Entrepreneurs' Fund were selling stockholders in the registered public offering.

F3 · ownership.nature: These shares are held of record by Highland Capital Partners VII-B Limited Partnership ("Highland Capital VII-B"). HMP VII LLC is the general partner of HMP VII LP, which is the general partner of Highland Capital VII-B. The Managing Members are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VII-B and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Capital VII-B to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · nonDerivative · entry 5

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 0

F6 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Highland Capital VII sold 229,293 shares of Class A Common Stock, Highland Capital VII-B sold 55,562 shares of Class A Common Stock, Highland Capital VII-C sold 80,916 shares of Class A Common Stock and Highland Entrepreneurs' Fund sold 7,185 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). Highland Capital VII, Highland Capital VII-B, Highland Capital VII-C and Highland Entrepreneurs' Fund were selling stockholders in the registered public offering.

F2 · ownership.nature: These shares are held of record by Highland Capital Partners VII Limited Partnership ("Highland Capital VII"). Highland Management Partners VII, LLC ("HMP VII LLC") is the general partner of Highland Management Partners VII Limited Partnership ("HMP VII LP"), which is the general partner of Highland Capital VII. Robert J. Davis, Paul A. Maeder, Corey M. Mulloy and Daniel J. Nova, a member of the Issuer's board of directors (collectively, the "Managing Members"), are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VII and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Capital VII to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · nonDerivative · entry 4

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 7,185

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F5 · ownership.nature: These shares are held of record by Highland Entrepreneurs' Fund VII Limited Partnership ("Highland Entrepreneurs' Fund"). HMP VII LLC is the general partner of HMP VII LP, which is the general partner of Highland Entrepreneurs' Fund. The Managing Members are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Entrepreneurs' Fund and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Entrepreneurs' Fund to the extent of their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · nonDerivative · entry 3

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 80,916

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · ownership.nature: These shares are held of record by Highland Capital Partners VII-C Limited Partnership ("Highland Capital VII-C"). HMP VII LLC is the general partner of HMP VII LP, which is the general partner of Highland Capital VII-C. The Managing Members are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VII-C and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Capital VII-C to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · nonDerivative · entry 2

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 55,562

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F3 · ownership.nature: These shares are held of record by Highland Capital Partners VII-B Limited Partnership ("Highland Capital VII-B"). HMP VII LLC is the general partner of HMP VII LP, which is the general partner of Highland Capital VII-B. The Managing Members are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VII-B and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Capital VII-B to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000051 · wf-form4_162794794638539.xml · nonDerivative · entry 1

Highland Management Partners VIII Ltd · CIK 0001554033 · 10% owner

Highland Management Partners VII, LLC · CIK 0001554026 · 10% owner

Highland Management Partners VII Limited Partnership · CIK 0001554027 · 10% owner

Highland Capital Partners VII LP · CIK 0001343678 · 10% owner

HIGHLAND CAPITAL PARTNERS VII-B L P · CIK 0001343244 · 10% owner

Highland Capital Partners VII-C LP · CIK 0001343673 · 10% owner

Highland Entrepreneurs Fund VII Limited Partnership · CIK 0001357840 · 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: 229,293

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: These shares are held of record by Highland Capital Partners VII Limited Partnership ("Highland Capital VII"). Highland Management Partners VII, LLC ("HMP VII LLC") is the general partner of Highland Management Partners VII Limited Partnership ("HMP VII LP"), which is the general partner of Highland Capital VII. Robert J. Davis, Paul A. Maeder, Corey M. Mulloy and Daniel J. Nova, a member of the Issuer's board of directors (collectively, the "Managing Members"), are the managing members of HMP VII LLC. Each of HMP VII LP, HMP VII LLC and the Managing Members may be deemed to share voting, investment and dispositive power over the shares held by Highland Capital VII and as a result may be deemed to have beneficial ownership over such shares. Each of HMP VII LP, HMP VII LLC and the Managing Members disclaims beneficial ownership over the shares held by Highland Capital VII to the extent of its or their respective pecuniary interests therein, if any.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · derivative · entry 12

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV Ancillary, L.P.

Disclosed balance after: 285,749

Underlying: Class A Common Stock · 31,751 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · derivative · entry 11

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV L.P.

Disclosed balance after: 4,981,748

Underlying: Class A Common Stock · 553,526 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · derivative · entry 10

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth II, L.P.

Disclosed balance after: 2,314,091

Underlying: Class A Common Stock · 257,121 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · derivative · entry 9

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth I, L.P.

Disclosed balance after: 1,542,727

Underlying: Class A Common Stock · 171,414 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · nonDerivative · entry 8

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV Ancillary, L.P.

Disclosed balance after: 0

F3 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Upfront Growth I sold 171,414 shares of Class A Common Stock, Upfront Growth II sold 257,121 shares of Class A Common Stock, Upfront IV sold 553,526 shares of Class A Common Stock and Upfront IV Ancillary sold 31,751 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). The Upfront Entities were selling stockholders in the registered public offering.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · nonDerivative · entry 7

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV, L.P.

Disclosed balance after: 0

F3 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Upfront Growth I sold 171,414 shares of Class A Common Stock, Upfront Growth II sold 257,121 shares of Class A Common Stock, Upfront IV sold 553,526 shares of Class A Common Stock and Upfront IV Ancillary sold 31,751 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). The Upfront Entities were selling stockholders in the registered public offering.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · nonDerivative · entry 6

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth II, L.P.

Disclosed balance after: 0

F3 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Upfront Growth I sold 171,414 shares of Class A Common Stock, Upfront Growth II sold 257,121 shares of Class A Common Stock, Upfront IV sold 553,526 shares of Class A Common Stock and Upfront IV Ancillary sold 31,751 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). The Upfront Entities were selling stockholders in the registered public offering.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · nonDerivative · entry 5

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth I, L.P.

Disclosed balance after: 0

F3 · kind: Pursuant to an underwriting agreement and in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021, Upfront Growth I sold 171,414 shares of Class A Common Stock, Upfront Growth II sold 257,121 shares of Class A Common Stock, Upfront IV sold 553,526 shares of Class A Common Stock and Upfront IV Ancillary sold 31,751 shares of Class A Common Stock, each at a price per share of $23.1588 (after underwriting discounts and commissions). The Upfront Entities were selling stockholders in the registered public offering.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · nonDerivative · entry 4

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV Ancillary, L.P.

Disclosed balance after: 31,751

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · nonDerivative · entry 3

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront IV, L.P.

Disclosed balance after: 553,526

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · nonDerivative · entry 2

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth II, L.P.

Disclosed balance after: 257,121

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000050 · wf-form4_162794669088520.xml · nonDerivative · entry 1

BETTINELLI GREG · CIK 0001583198 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Upfront Growth I, L.P.

Disclosed balance after: 171,414

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 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F1 · price: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F2 · ownership.nature: Upfront Growth GP I, LLC is the general partner of Upfront Growth I, L.P. ("Upfront Growth I"). Upfront Growth GP II, LLC is the general partner of Upfront Growth II, L.P. ("Upfront Growth II"). Upfront GP IV, L.P. is the general partner of Upfront IV, L.P. ("Upfront IV"). Upfront IV Ancillary GP, LLC is the general partner of Upfront IV Ancillary, L.P. ("Upfront IV Ancillary," and together with Upfront Growth I, Upfront Growth II and Upfront IV, the "Upfront Entities"). The Upfront Entities are managed by Upfront Ventures Management, LLC which is controlled by Mark Suster and Yves Sisteron. The Reporting Person is a member or limited partner, as applicable, of the general partners of the respective Upfront Entities. The Reporting Person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000048 · wf-form4_162794631661780.xml · derivative · entry 6

HALEY TIMOTHY M · CIK 0001201583 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Redpoint Associates IV, LLC

Disclosed balance after: 240,896

Underlying: Class A Common Stock · 26,766 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Redpoint Ventures IV, LLC ("RV IV LLC") is the sole general partner of Redpoint Ventures IV, L.P. ("RV IV"). RV IV LLC and Redpoint Associates IV, LLC ("RA IV") are under common control. The Reporting Person is a manager of RV IV LLC and RA IV, and disclaims beneficial ownership of the securities held by RV IV and RA IV, except to the extent of his pecuniary interest therein.

SEC source: 0001484778-21-000048 · wf-form4_162794631661780.xml · derivative · entry 5

HALEY TIMOTHY M · CIK 0001201583 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Redpoint Ventures IV, L.P

Disclosed balance after: 9,394,981

Underlying: Class A Common Stock · 1,043,885 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.

F4 · derivative.exercise_price: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F1 · kind: Each share of Class B Common Stock was converted into one share of Class A Common Stock at the option of the holder in connection with the registered public offering of shares of the Issuer's Class A Common Stock, pursuant to a final prospectus dated July 28, 2021, which offering was consummated on August 2, 2021.

F4 · derivative.exercise_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F4 · derivative.expiration_date: Each share of Class B Common Stock is convertible into one share of Class A Common Stock at the option of the holder and upon the occurrence of other events set forth in the Issuer's Certificate of Incorporation.

F2 · ownership.nature: Redpoint Ventures IV, LLC ("RV IV LLC") is the sole general partner of Redpoint Ventures IV, L.P. ("RV IV"). RV IV LLC and Redpoint Associates IV, LLC ("RA IV") are under common control. The Reporting Person is a manager of RV IV LLC and RA IV, and disclaims beneficial ownership of the securities held by RV IV and RA IV, except to the extent of his pecuniary interest therein.