ROOT JONATHAN D

SEC source: 0001062993-21-004765 · form4.xml · nonDerivative · entry 5

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 521,864

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F5 · ownership.direct: Represents a change in the form of ownership from indirect to direct by virtue of the receipt of shares in the PMG X Distribution. Shares are held directly by the Reporting Person.

SEC source: 0001062993-21-004765 · form4.xml · nonDerivative · entry 4

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by PMG X

Disclosed balance after: 0

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F4 · ownership.nature: Represents a pro-rata in-kind distribution of the Issuer's common stock held directly by PMG X, without additional consideration to its members (the "PMG Distribution"). The Reporting Person, a director of the Issuer, is a managing member of PMG X with additional rights with respect to the shares, and may be deemed to have sole voting and dispositive power over the reported securities held by PMG X, and disclaims beneficial ownership of such securities held by PMG X, except to the extent of any pecuniary interest therein.

SEC source: 0001062993-21-004765 · form4.xml · nonDerivative · entry 3

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by PMG X

Disclosed balance after: 685,826

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F3 · ownership.nature: Represents a pro-rata in-kind distribution of the Issuer's common stock to PMG X from each of the USVP X Funds, without additional consideration. The Reporting Person, a director of the Issuer, is a managing member of PMG X with additional rights with respect to the shares, and deemed to have sole voting and dispositive power over the reported securities held by PMG X, and disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001062993-21-004765 · form4.xml · nonDerivative · entry 2

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by AFF X

Disclosed balance after: 0

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F2 · ownership.nature: Represents a pro-rata in-kind distribution of the Issuer's common stock held directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund L.P. ("AFF X" and, together with USVP X, the "USVP X Funds"), without additional consideration, to its partners. Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the securities held by the USVP X Funds. The Reporting Person, a director of the Issuer, is a managing member of PMG X with additional rights with respect to such shares, and deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds, and disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001062993-21-004765 · form4.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by USVP X

Disclosed balance after: 0

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F2 · ownership.nature: Represents a pro-rata in-kind distribution of the Issuer's common stock held directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund L.P. ("AFF X" and, together with USVP X, the "USVP X Funds"), without additional consideration, to its partners. Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the securities held by the USVP X Funds. The Reporting Person, a director of the Issuer, is a managing member of PMG X with additional rights with respect to such shares, and deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds, and disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001209191-21-023869 · doc4.xml · derivative · entry 5

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 455,229 shares

Expires not disclosed

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

F1 · derivative.exercise_date: Each share of Series A Preferred Stock, Series B-1 Preferred Stock, Series B-2 Preferred Stock and Series C Preferred Stock converted into one share of the Issuer's Common Stock immediately prior to the completion of the Issuer's initial public offering. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: Each share of Series A Preferred Stock, Series B-1 Preferred Stock, Series B-2 Preferred Stock and Series C Preferred Stock converted into one share of the Issuer's Common Stock immediately prior to the completion of the Issuer's initial public offering. The Preferred Stock had no expiration date.

F2 · ownership.nature: These securities are held of record by U.S. Venture Partners XI, L.P. ("USVP XI"). Presidio Management Group XI, L.L.C. ("PMG XI"), the general partner of USVP XI, has sole voting and dispositive power with respect to the shares held by USVP XI. The Reporting Person is a managing member of PMG XI with additional rights with respect to the issuer's securities, and may be deemed to have sole voting and dispositive power with respect to such shares. Each of the foregoing persons disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001209191-21-023869 · doc4.xml · derivative · entry 4

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 1,366,707 shares

Expires not disclosed

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

F1 · derivative.exercise_date: Each share of Series A Preferred Stock, Series B-1 Preferred Stock, Series B-2 Preferred Stock and Series C Preferred Stock converted into one share of the Issuer's Common Stock immediately prior to the completion of the Issuer's initial public offering. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: Each share of Series A Preferred Stock, Series B-1 Preferred Stock, Series B-2 Preferred Stock and Series C Preferred Stock converted into one share of the Issuer's Common Stock immediately prior to the completion of the Issuer's initial public offering. The Preferred Stock had no expiration date.

F2 · ownership.nature: These securities are held of record by U.S. Venture Partners XI, L.P. ("USVP XI"). Presidio Management Group XI, L.L.C. ("PMG XI"), the general partner of USVP XI, has sole voting and dispositive power with respect to the shares held by USVP XI. The Reporting Person is a managing member of PMG XI with additional rights with respect to the issuer's securities, and may be deemed to have sole voting and dispositive power with respect to such shares. Each of the foregoing persons disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001209191-21-023869 · doc4.xml · derivative · entry 3

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Common Stock · 1,651,607 shares

Expires not disclosed

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

F1 · derivative.exercise_date: Each share of Series A Preferred Stock, Series B-1 Preferred Stock, Series B-2 Preferred Stock and Series C Preferred Stock converted into one share of the Issuer's Common Stock immediately prior to the completion of the Issuer's initial public offering. The Preferred Stock had no expiration date.

F1 · derivative.expiration_date: Each share of Series A Preferred Stock, Series B-1 Preferred Stock, Series B-2 Preferred Stock and Series C Preferred Stock converted into one share of the Issuer's Common Stock immediately prior to the completion of the Issuer's initial public offering. The Preferred Stock had no expiration date.

F2 · ownership.nature: These securities are held of record by U.S. Venture Partners XI, L.P. ("USVP XI"). Presidio Management Group XI, L.L.C. ("PMG XI"), the general partner of USVP XI, has sole voting and dispositive power with respect to the shares held by USVP XI. The Reporting Person is a managing member of PMG XI with additional rights with respect to the issuer's securities, and may be deemed to have sole voting and dispositive power with respect to such shares. Each of the foregoing persons disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001209191-21-023869 · doc4.xml · nonDerivative · entry 2

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,625

SEC source: 0001209191-21-023869 · doc4.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 3,473,543

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 Series A Preferred Stock, Series B-1 Preferred Stock, Series B-2 Preferred Stock and Series C Preferred Stock converted into one share of the Issuer's Common Stock immediately prior to the completion of the Issuer's initial public offering. The Preferred Stock had no expiration date.

F2 · ownership.nature: These securities are held of record by U.S. Venture Partners XI, L.P. ("USVP XI"). Presidio Management Group XI, L.L.C. ("PMG XI"), the general partner of USVP XI, has sole voting and dispositive power with respect to the shares held by USVP XI. The Reporting Person is a managing member of PMG XI with additional rights with respect to the issuer's securities, and may be deemed to have sole voting and dispositive power with respect to such shares. Each of the foregoing persons disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001548538-21-000017 · edgar.xml · nonDerivative · entry 5

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 427,892

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F5 · ownership.direct: Represents a change in the form of ownership from indirect to direct by virtue of the receipt of shares in the PMG X Distribution. Shares are held directly by the Reporting Person.

SEC source: 0001548538-21-000017 · edgar.xml · nonDerivative · entry 4

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by PMG X

Disclosed balance after: 0

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F4 · ownership.nature: Represents a pro-rata in-kind distribution of the Issuer's common stock held directly by PMG X, without additional consideration to its members (the "PMG Distribution"). The Reporting Person, a director of the Issuer, is a managing member of PMG X with additional rights with respect to the shares, and may be deemed to have sole voting and dispositive power over the reported securities held by PMG X, and disclaims beneficial ownership of such securities held by PMG X, except to the extent of any pecuniary interest therein.

SEC source: 0001548538-21-000017 · edgar.xml · nonDerivative · entry 3

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by PMG X

Disclosed balance after: 685,827

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F3 · ownership.nature: Represents a pro-rata in-kind distribution of the Issuer's common stock to PMG X from each of the USVP X Funds, without additional consideration. The Reporting Person, a director of the Issuer, is a managing member of PMG X with additional rights with respect to the shares, and deemed to have sole voting and dispositive power over the reported securities held by PMG X, and disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001548538-21-000017 · edgar.xml · nonDerivative · entry 2

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by AFF X

Disclosed balance after: 83,813

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F2 · ownership.nature: Represents a pro-rata in-kind distribution of the Issuer's common stock held directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund L.P. ("AFF X" and, together with USVP X, the "USVP X Funds"), without additional consideration, to its partners. Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the securities held by the USVP X Funds. The Reporting Person, a director of the Issuer, is a managing member of PMG X with additional rights with respect to such shares, and deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds, and disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001548538-21-000017 · edgar.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by USVP X

Disclosed balance after: 2,619,872

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F2 · ownership.nature: Represents a pro-rata in-kind distribution of the Issuer's common stock held directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund L.P. ("AFF X" and, together with USVP X, the "USVP X Funds"), without additional consideration, to its partners. Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the securities held by the USVP X Funds. The Reporting Person, a director of the Issuer, is a managing member of PMG X with additional rights with respect to such shares, and deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds, and disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001062993-22-008141 · form4.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by Spouse

Disclosed balance after: 350

F1 · shares: Shares are being reported following the discovery that shares of the issuer were purchased in discretionary IRA accounts held by the spouse of the reporting person. The reporting person is not an owner of such IRA accounts. The total in Column 5 of Table I does not reflect previously reported transactions that occurred after 3/3/2021.

F1 · balance_after: Shares are being reported following the discovery that shares of the issuer were purchased in discretionary IRA accounts held by the spouse of the reporting person. The reporting person is not an owner of such IRA accounts. The total in Column 5 of Table I does not reflect previously reported transactions that occurred after 3/3/2021.

F1 · ownership.direct: Shares are being reported following the discovery that shares of the issuer were purchased in discretionary IRA accounts held by the spouse of the reporting person. The reporting person is not an owner of such IRA accounts. The total in Column 5 of Table I does not reflect previously reported transactions that occurred after 3/3/2021.

F1 · ownership.nature: Shares are being reported following the discovery that shares of the issuer were purchased in discretionary IRA accounts held by the spouse of the reporting person. The reporting person is not an owner of such IRA accounts. The total in Column 5 of Table I does not reflect previously reported transactions that occurred after 3/3/2021.

SEC source: 0001209191-20-062391 · doc4.xml · derivative · entry 9

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By U.S.VenturePartners XII-A,L.P.

Disclosed balance after: 0

Underlying: Common Stock · 14,677 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.

F2 · derivative.exercise_price: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · derivative.exercise_date: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · derivative.expiration_date: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F3 · ownership.nature: Presidio Management Group XII, L.L.C. (PMG XII), the general partner of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, USVP XII), has sole voting and dispositive power with respect to the shares held by USVP XII. The reporting person is a managing member of PMG XII, and shares voting and dispositive power with respect to the shares held by USVP XII. The reporting person disclaims beneficial ownership of such holdings, except to the extent of his pecuniary interest in the shares.

SEC source: 0001209191-20-062391 · doc4.xml · derivative · entry 8

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By U.S VenturePartners XII,L.P.

Disclosed balance after: 0

Underlying: Common Stock · 289,198 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.

F2 · derivative.exercise_price: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · derivative.exercise_date: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · derivative.expiration_date: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F3 · ownership.nature: Presidio Management Group XII, L.L.C. (PMG XII), the general partner of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, USVP XII), has sole voting and dispositive power with respect to the shares held by USVP XII. The reporting person is a managing member of PMG XII, and shares voting and dispositive power with respect to the shares held by USVP XII. The reporting person disclaims beneficial ownership of such holdings, except to the extent of his pecuniary interest in the shares.

SEC source: 0001209191-20-062391 · doc4.xml · derivative · entry 7

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By U.S.VenturePartners XII-A,L.P.

Disclosed balance after: 0

Underlying: Common Stock · 90,335 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.

F2 · derivative.exercise_price: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · derivative.exercise_date: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · derivative.expiration_date: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F3 · ownership.nature: Presidio Management Group XII, L.L.C. (PMG XII), the general partner of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, USVP XII), has sole voting and dispositive power with respect to the shares held by USVP XII. The reporting person is a managing member of PMG XII, and shares voting and dispositive power with respect to the shares held by USVP XII. The reporting person disclaims beneficial ownership of such holdings, except to the extent of his pecuniary interest in the shares.

SEC source: 0001209191-20-062391 · doc4.xml · derivative · entry 6

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By U.S VenturePartners XII,L.P.

Disclosed balance after: 0

Underlying: Common Stock · 1,779,969 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.

F2 · derivative.exercise_price: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · derivative.exercise_date: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · derivative.expiration_date: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F3 · ownership.nature: Presidio Management Group XII, L.L.C. (PMG XII), the general partner of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, USVP XII), has sole voting and dispositive power with respect to the shares held by USVP XII. The reporting person is a managing member of PMG XII, and shares voting and dispositive power with respect to the shares held by USVP XII. The reporting person disclaims beneficial ownership of such holdings, except to the extent of his pecuniary interest in the shares.

SEC source: 0001209191-20-062391 · doc4.xml · nonDerivative · entry 5

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By U.S.VenturePartners XII-A,L.P.

Disclosed balance after: 105,012

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

F2 · price: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F3 · ownership.nature: Presidio Management Group XII, L.L.C. (PMG XII), the general partner of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, USVP XII), has sole voting and dispositive power with respect to the shares held by USVP XII. The reporting person is a managing member of PMG XII, and shares voting and dispositive power with respect to the shares held by USVP XII. The reporting person disclaims beneficial ownership of such holdings, except to the extent of his pecuniary interest in the shares.

SEC source: 0001209191-20-062391 · doc4.xml · nonDerivative · entry 4

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By U.S.VenturePartners XII-A,L.P.

Disclosed balance after: 90,335

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.

F2 · shares: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · price: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F3 · ownership.nature: Presidio Management Group XII, L.L.C. (PMG XII), the general partner of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, USVP XII), has sole voting and dispositive power with respect to the shares held by USVP XII. The reporting person is a managing member of PMG XII, and shares voting and dispositive power with respect to the shares held by USVP XII. The reporting person disclaims beneficial ownership of such holdings, except to the extent of his pecuniary interest in the shares.

SEC source: 0001209191-20-062391 · doc4.xml · nonDerivative · entry 3

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By U.S VenturePartners XII,L.P.

Disclosed balance after: 2,069,167

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.

F2 · shares: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · price: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F3 · ownership.nature: Presidio Management Group XII, L.L.C. (PMG XII), the general partner of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, USVP XII), has sole voting and dispositive power with respect to the shares held by USVP XII. The reporting person is a managing member of PMG XII, and shares voting and dispositive power with respect to the shares held by USVP XII. The reporting person disclaims beneficial ownership of such holdings, except to the extent of his pecuniary interest in the shares.

SEC source: 0001209191-20-062391 · doc4.xml · nonDerivative · entry 2

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By U.S VenturePartners XII,L.P.

Disclosed balance after: 1,779,969

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.

F2 · shares: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F2 · price: All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.

F3 · ownership.nature: Presidio Management Group XII, L.L.C. (PMG XII), the general partner of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, USVP XII), has sole voting and dispositive power with respect to the shares held by USVP XII. The reporting person is a managing member of PMG XII, and shares voting and dispositive power with respect to the shares held by USVP XII. The reporting person disclaims beneficial ownership of such holdings, except to the extent of his pecuniary interest in the shares.

SEC source: 0001209191-20-062391 · doc4.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 95,238

F1 · kind: The shares were purchased in the Issuer's initial public offering.

SEC source: 0001209191-20-062051 · doc4.xml · derivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,270

Underlying: Common Stock · 38,270 shares

Expires 2030-12-02

F1 · derivative.exercise_date: The shares subject to the option vest in equal monthly installments over the 36 months following December 3, 2020.

SEC source: 0001527715-20-000022 · edgar.xml · nonDerivative · entry 5

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,996

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F5 · ownership.direct: Represents a change in the form of ownership from indirect to direct by virtue of the receipt of shares in the PMGX Distribution. Shares are held directly by the Reporting Person.

SEC source: 0001527715-20-000022 · edgar.xml · nonDerivative · entry 4

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by PMG X

Disclosed balance after: 0

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F4 · ownership.nature: Represnts a pro-rata in-kind distribution of the Issuer's common stock held direction by PMG X, without additional consideration to its members (the "PMG Distribution"). The Reporting Person, a director of the Issuer, is a managing member of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by PMG X, and disclaims beneficial ownership of such securities held by PMG X, except to the extent of any pecuniary interest therein.

SEC source: 0001527715-20-000022 · edgar.xml · nonDerivative · entry 3

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by PMG X

Disclosed balance after: 587,851

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F3 · ownership.nature: Represnts a pro-rata in-kind distribution of the Issuer's common stock to PMG X from each of USVP X Funds, without additional consideration. The Reporting Person, a director of the Issuer, is a managing member of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by PMG X, and disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001527715-20-000022 · edgar.xml · nonDerivative · entry 2

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by AFF X

Disclosed balance after: 167,627

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F2 · ownership.nature: Represnts a pro-rata in-kind distribuiont of the Issuer's common stock held directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund L.P. ("AFF X") and, together with USVP X, the ("USVP X Funds"), without additional consideration, to its partners. Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the securities held by the USVPX Funds. The Reporting Person, a director of the Issuer, is a managing member of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds, and disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001527715-20-000022 · edgar.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by USVP X

Disclosed balance after: 5,239,744

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F2 · ownership.nature: Represnts a pro-rata in-kind distribuiont of the Issuer's common stock held directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund L.P. ("AFF X") and, together with USVP X, the ("USVP X Funds"), without additional consideration, to its partners. Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the securities held by the USVPX Funds. The Reporting Person, a director of the Issuer, is a managing member of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds, and disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.

SEC source: 0001548538-21-000005 · edgar.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 333,791

F1 · kind: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F1 · price: Represents a pro-rata in-kind distribution of the Issuer's common stock, and not a purchase or sale, without additional consideration to their respective partners, members and assignees, as applicable.

F2 · balance_after: The original Form 4 filed on November 19, 2020, is being amended by this Form 4 amendment solely to correct an adminstrative error, which incorrectly underreported the amount of shares owned by the Reporting Person listed in column 5 as 81,996 shares instead of 333,791.shares.

F3 · ownership.direct: Represents a change in the form of ownership from indirect to direct by virtue of the receipt of shares in the PMGX Distribution. Shares are held directly by the Reporting Person.

SEC source: 0001562180-22-002817 · primarydocument.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly Owned by Spouse

Disclosed balance after: 32

F1 · shares: Shares are being reported following the discovery that shares of the issuer were purchased in discretionary IRA accounts held by the spouse of the reporting person. The reporting person is not an owner of such IRA accounts. The total in Column 5 reflects amounts held as of the date of this filing.

F1 · ownership.direct: Shares are being reported following the discovery that shares of the issuer were purchased in discretionary IRA accounts held by the spouse of the reporting person. The reporting person is not an owner of such IRA accounts. The total in Column 5 reflects amounts held as of the date of this filing.

F1 · ownership.nature: Shares are being reported following the discovery that shares of the issuer were purchased in discretionary IRA accounts held by the spouse of the reporting person. The reporting person is not an owner of such IRA accounts. The total in Column 5 reflects amounts held as of the date of this filing.

SEC source: 0001209191-20-032416 · doc4.xml · derivative · entry 10

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly Owned by AFF X

Disclosed balance after: 0

Underlying: Common Stock · 72,887 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.exercise_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.expiration_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F2 · ownership.nature: The reported securities are owned directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund, L.P. ("AFF X") (together, the "USVP X Funds"). Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds. Jonathan D. Root, a director of the issuer, Irwin Federman, Steven Krausz, Richard Lewis, Paul Matteucci and Casey Tansey are the managing members of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds. Such persons and entities disclaim beneficial ownership of the reported securities held by the USVP X Funds, except to the extent of any pecuniary interest therein. 3. The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

SEC source: 0001209191-20-032416 · doc4.xml · derivative · entry 9

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly Owned by USVP X

Disclosed balance after: 0

Underlying: Common Stock · 2,278,331 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.exercise_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.expiration_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F2 · ownership.nature: The reported securities are owned directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund, L.P. ("AFF X") (together, the "USVP X Funds"). Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds. Jonathan D. Root, a director of the issuer, Irwin Federman, Steven Krausz, Richard Lewis, Paul Matteucci and Casey Tansey are the managing members of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds. Such persons and entities disclaim beneficial ownership of the reported securities held by the USVP X Funds, except to the extent of any pecuniary interest therein. 3. The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

SEC source: 0001209191-20-032416 · doc4.xml · derivative · entry 8

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly Owned by AFF X

Disclosed balance after: 0

Underlying: Common Stock · 92,771 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.exercise_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.expiration_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F2 · ownership.nature: The reported securities are owned directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund, L.P. ("AFF X") (together, the "USVP X Funds"). Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds. Jonathan D. Root, a director of the issuer, Irwin Federman, Steven Krausz, Richard Lewis, Paul Matteucci and Casey Tansey are the managing members of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds. Such persons and entities disclaim beneficial ownership of the reported securities held by the USVP X Funds, except to the extent of any pecuniary interest therein. 3. The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

SEC source: 0001209191-20-032416 · doc4.xml · derivative · entry 7

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly Owned by USVP X

Disclosed balance after: 0

Underlying: Common Stock · 2,899,876 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.exercise_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.expiration_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F2 · ownership.nature: The reported securities are owned directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund, L.P. ("AFF X") (together, the "USVP X Funds"). Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds. Jonathan D. Root, a director of the issuer, Irwin Federman, Steven Krausz, Richard Lewis, Paul Matteucci and Casey Tansey are the managing members of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds. Such persons and entities disclaim beneficial ownership of the reported securities held by the USVP X Funds, except to the extent of any pecuniary interest therein. 3. The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

SEC source: 0001209191-20-032416 · doc4.xml · derivative · entry 6

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly Owned by AFF X

Disclosed balance after: 0

Underlying: Common Stock · 73,809 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.exercise_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.expiration_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F2 · ownership.nature: The reported securities are owned directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund, L.P. ("AFF X") (together, the "USVP X Funds"). Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds. Jonathan D. Root, a director of the issuer, Irwin Federman, Steven Krausz, Richard Lewis, Paul Matteucci and Casey Tansey are the managing members of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds. Such persons and entities disclaim beneficial ownership of the reported securities held by the USVP X Funds, except to the extent of any pecuniary interest therein. 3. The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

SEC source: 0001209191-20-032416 · doc4.xml · derivative · entry 5

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly Owned by USVP X

Disclosed balance after: 0

Underlying: Common Stock · 2,307,142 shares

Expires not disclosed

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

F1 · derivative.exercise_price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.exercise_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F1 · derivative.expiration_date: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F2 · ownership.nature: The reported securities are owned directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund, L.P. ("AFF X") (together, the "USVP X Funds"). Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds. Jonathan D. Root, a director of the issuer, Irwin Federman, Steven Krausz, Richard Lewis, Paul Matteucci and Casey Tansey are the managing members of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds. Such persons and entities disclaim beneficial ownership of the reported securities held by the USVP X Funds, except to the extent of any pecuniary interest therein. 3. The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

SEC source: 0001209191-20-032416 · doc4.xml · derivative · entry 4

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,947

Underlying: Common Stock · 8,947 shares

Expires not disclosed

F3 · derivative.exercise_price: The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

F3 · price: The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

F3 · derivative.exercise_date: The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

F3 · derivative.expiration_date: The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

SEC source: 0001209191-20-032416 · doc4.xml · nonDerivative · entry 3

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly Owned by AFF X

Disclosed balance after: 239,467

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

F1 · price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F2 · ownership.nature: The reported securities are owned directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund, L.P. ("AFF X") (together, the "USVP X Funds"). Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds. Jonathan D. Root, a director of the issuer, Irwin Federman, Steven Krausz, Richard Lewis, Paul Matteucci and Casey Tansey are the managing members of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds. Such persons and entities disclaim beneficial ownership of the reported securities held by the USVP X Funds, except to the extent of any pecuniary interest therein. 3. The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

SEC source: 0001209191-20-032416 · doc4.xml · nonDerivative · entry 2

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly Owned by USVP X

Disclosed balance after: 7,485,349

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

F1 · price: Upon the closing of the Issuer's initial public offering, each share of preferred stock automatically converted into shares of the Issuer's common stock on a one-for-one basis.

F2 · ownership.nature: The reported securities are owned directly by each of U.S. Venture Partners X, L.P. ("USVP X") and USVP X Affiliates Fund, L.P. ("AFF X") (together, the "USVP X Funds"). Presidio Management Group X, L.L.C. ("PMG X") is the general partner of each of the USVP X Funds and may be deemed to have sole voting and dispositive power over the reported securities held by the USVP X Funds. Jonathan D. Root, a director of the issuer, Irwin Federman, Steven Krausz, Richard Lewis, Paul Matteucci and Casey Tansey are the managing members of PMG X, who may be deemed to share voting and dispositive power over the reported securities held by the USVP X Funds. Such persons and entities disclaim beneficial ownership of the reported securities held by the USVP X Funds, except to the extent of any pecuniary interest therein. 3. The restricted stock unit vests in three equal annual installments beginning on May 27, 2020.

SEC source: 0001209191-20-032416 · doc4.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 251,795

SEC source: 0000899243-19-010989 · doc4.xml · nonDerivative · entry 1

ROOT JONATHAN D · CIK 0001225480 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · price: On April 23, 2019, pursuant to the Agreement and Plan of Merger and Reorganization (the "Merger Agreement"), dated as of December 5, 2018, by and among Mereo Biopharma Group PLC ("Mereo"), Mereo US Holdings Inc., Mereo Mergerco One Inc. ("Merger Sub") and the Issuer, Merger Sub merged with and into the Issuer, with the Issuer surviving as an indirect wholly-owned subsidiary of Mereo (the "Merger"). Pursuant to the Merger, the Issuer's stockholders received the right to receive (i) a certain number of American Depositary Shares, each representing five ordinary shares, 0.003 pounds par value per share, of Mereo and (ii) one contingent value right, which represents the contractual right to receive contingent payments if specified milestones are achieved within agreed time periods, subject to and in accordance with the CVR Agreement, dated April 23, 2019, by and among Computershare Inc. and Mereo (the "Merger Consideration") for each share of the Issuer's stock that they own.

F2 · price: (Continued from footnote 1) Pursuant to the Merger, the Reporting Person disposed of all shares of Issuer common stock beneficially owned by it, and received the Merger Consideration for each share of Issuer common stock.

SEC source: 0001548538-18-000004 · edgar.xml · nonDerivative · entry 6

Presidio Management Group IX, L.L.C. · CIK 0001527715 · 10% owner

U S Venture Partners IX L P · CIK 0001309185 · 10% owner

KRAUSZ STEVEN M · CIK 0001190636 · 10% owner

LIDDLE DAVID E · CIK 0001212726 · 10% owner

Matteucci Paul A · CIK 0001370817 · 10% owner

ROOT JONATHAN D · CIK 0001225480 · 10% owner

Tansey Casey M · CIK 0001474322 · 10% owner

YOUNG PHILIP M · CIK 0001048637 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by Steven Krausz

Disclosed balance after: 97,593

F2 · ownership.nature: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Irwin Federman, a director of the Issuer, and each of Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, Casey Tansey, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.

SEC source: 0001548538-18-000004 · edgar.xml · nonDerivative · entry 5

Presidio Management Group IX, L.L.C. · CIK 0001527715 · 10% owner

U S Venture Partners IX L P · CIK 0001309185 · 10% owner

KRAUSZ STEVEN M · CIK 0001190636 · 10% owner

LIDDLE DAVID E · CIK 0001212726 · 10% owner

Matteucci Paul A · CIK 0001370817 · 10% owner

ROOT JONATHAN D · CIK 0001225480 · 10% owner

Tansey Casey M · CIK 0001474322 · 10% owner

YOUNG PHILIP M · CIK 0001048637 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by Steven Krausz

Disclosed balance after: 99,993

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $.95 to $.96, inclusive for sales made on November 12, 2018. The reporting persons undertake to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.

F2 · ownership.nature: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Irwin Federman, a director of the Issuer, and each of Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, Casey Tansey, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.

SEC source: 0001548538-18-000007 · edgar.xml · nonDerivative · entry 9

Presidio Management Group IX, L.L.C. · CIK 0001527715 · 10% owner

U S Venture Partners IX L P · CIK 0001309185 · 10% owner

FEDERMAN IRWIN · CIK 0001192391 · 10% owner

KRAUSZ STEVEN M · CIK 0001190636 · 10% owner

LIDDLE DAVID E · CIK 0001212726 · 10% owner

Matteucci Paul A · CIK 0001370817 · 10% owner

ROOT JONATHAN D · CIK 0001225480 · 10% owner

YOUNG PHILIP M · CIK 0001048637 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by Philip Young

Disclosed balance after: 18,212

F1 · kind: Represents a pro-rata, in-kind distribution by U.S. Venture Partners IX, L.P. ("USVP IX"), without additional consideration, to its partners.

F1 · price: Represents a pro-rata, in-kind distribution by U.S. Venture Partners IX, L.P. ("USVP IX"), without additional consideration, to its partners.

F2 · ownership.direct: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Casey Tansey, a director of the Issuer, and each of Irwin Federman, Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.

F2 · ownership.nature: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Casey Tansey, a director of the Issuer, and each of Irwin Federman, Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.

SEC source: 0001548538-18-000007 · edgar.xml · nonDerivative · entry 8

Presidio Management Group IX, L.L.C. · CIK 0001527715 · 10% owner

U S Venture Partners IX L P · CIK 0001309185 · 10% owner

FEDERMAN IRWIN · CIK 0001192391 · 10% owner

KRAUSZ STEVEN M · CIK 0001190636 · 10% owner

LIDDLE DAVID E · CIK 0001212726 · 10% owner

Matteucci Paul A · CIK 0001370817 · 10% owner

ROOT JONATHAN D · CIK 0001225480 · 10% owner

YOUNG PHILIP M · CIK 0001048637 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by Jonathan Root

Disclosed balance after: 18,982

F1 · kind: Represents a pro-rata, in-kind distribution by U.S. Venture Partners IX, L.P. ("USVP IX"), without additional consideration, to its partners.

F1 · price: Represents a pro-rata, in-kind distribution by U.S. Venture Partners IX, L.P. ("USVP IX"), without additional consideration, to its partners.

F2 · ownership.direct: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Casey Tansey, a director of the Issuer, and each of Irwin Federman, Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.

F2 · ownership.nature: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Casey Tansey, a director of the Issuer, and each of Irwin Federman, Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.

SEC source: 0001548538-18-000007 · edgar.xml · nonDerivative · entry 7

Presidio Management Group IX, L.L.C. · CIK 0001527715 · 10% owner

U S Venture Partners IX L P · CIK 0001309185 · 10% owner

FEDERMAN IRWIN · CIK 0001192391 · 10% owner

KRAUSZ STEVEN M · CIK 0001190636 · 10% owner

LIDDLE DAVID E · CIK 0001212726 · 10% owner

Matteucci Paul A · CIK 0001370817 · 10% owner

ROOT JONATHAN D · CIK 0001225480 · 10% owner

YOUNG PHILIP M · CIK 0001048637 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by Paul Matteucci

Disclosed balance after: 13,356

F1 · kind: Represents a pro-rata, in-kind distribution by U.S. Venture Partners IX, L.P. ("USVP IX"), without additional consideration, to its partners.

F1 · price: Represents a pro-rata, in-kind distribution by U.S. Venture Partners IX, L.P. ("USVP IX"), without additional consideration, to its partners.

F2 · ownership.direct: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Casey Tansey, a director of the Issuer, and each of Irwin Federman, Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.

F2 · ownership.nature: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Casey Tansey, a director of the Issuer, and each of Irwin Federman, Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.

SEC source: 0001548538-18-000007 · edgar.xml · nonDerivative · entry 6

Presidio Management Group IX, L.L.C. · CIK 0001527715 · 10% owner

U S Venture Partners IX L P · CIK 0001309185 · 10% owner

FEDERMAN IRWIN · CIK 0001192391 · 10% owner

KRAUSZ STEVEN M · CIK 0001190636 · 10% owner

LIDDLE DAVID E · CIK 0001212726 · 10% owner

Matteucci Paul A · CIK 0001370817 · 10% owner

ROOT JONATHAN D · CIK 0001225480 · 10% owner

YOUNG PHILIP M · CIK 0001048637 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Directly owned by David Liddle

Disclosed balance after: 15,391

F1 · kind: Represents a pro-rata, in-kind distribution by U.S. Venture Partners IX, L.P. ("USVP IX"), without additional consideration, to its partners.

F1 · price: Represents a pro-rata, in-kind distribution by U.S. Venture Partners IX, L.P. ("USVP IX"), without additional consideration, to its partners.

F2 · ownership.direct: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Casey Tansey, a director of the Issuer, and each of Irwin Federman, Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.

F2 · ownership.nature: This report is one of two reports each on a separate Form 4; however, these forms are related to the same transaction being filed by the reporting persons. The shares are held of record by USVP IX. Presidio Management Group IX, LLC ("PMG IX") is the general partner of USVP IX and may be deemed to have sole voting and dispositive power over the shares held by USVP IX. Casey Tansey, a director of the Issuer, and each of Irwin Federman, Steven M. Krausz, David E. Liddle, Paul A. Matteucci, Jonathan D. Root, and Philip M. Young, are managing members of PMG IX, and may be deemed to share voting and dispositive power over the shares held by USVP IX. Such persons and entities disclaim beneficial ownership of shares held by USVP IX, except to the extent of any proportionate pecuniary interest therein.