PATH

SEC source: 0001562180-21-004921 · primarydocument.xml · nonDerivative · entry 7

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By trust

Disclosed balance after: 434,612

F14 · kind: Reflects shares distributed in the distributions reported herein in each case to the limited partners or members of the applicable entity for no consideration, representing each limited partner's or member's pro-rata interest in such shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F15 · shares: Of the shares reflected, 72,248 shares are held by The Wong Family 2006 Trust, dated 8/30/2006, and 4,858 shares are held in each of three family GST trusts. The Reporting Person disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004921 · primarydocument.xml · nonDerivative · entry 6

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2016 L.P.

Disclosed balance after: 4,511,303

F12 · kind: On July 9, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 237,219 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London Investors 2016 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2016 L.P. to its members, representing each such member's pro rata interest in such Accel London Investors Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F13 · ownership.nature: These shares are held by Accel London Investors 2016 L.P.

SEC source: 0001562180-21-004921 · primarydocument.xml · nonDerivative · entry 5

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V Strategic Partners L.P.

Disclosed balance after: 711,216

F10 · kind: On July 9, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 37,398 shares of Class A common stock of the Issuer (the "Accel London V SP Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Strategic Partners L.P., representing each such partner's pro rata interest in such Accel London V SP Shares. On the same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V SP Shares it received in the distribution by Accel London V Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel London V SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F11 · ownership.nature: These shares are held by Accel London V Strategic Partners L.P.

SEC source: 0001562180-21-004921 · primarydocument.xml · nonDerivative · entry 4

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V L.P.

Disclosed balance after: 46,691,347

F7 · kind: On July 9, 2021, Accel London V L.P. distributed, for no consideration, 2,455,185 shares of Class A common stock of the Issuer (the "Accel London V Shares") to its limited partners and to Accel London V Associates L.P., the general partner of Accel London V L.P., representing each such partner's pro rata interest in such Accel London V Shares. On the same date, Accel London V Associates L.P. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V L.P. to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Associates L.P., representing each such partner's pro rata interest in such Accel London V Shares. Continued in footnote (8) below.

F8 · kind: Continued from footnote (7): Also on that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V Associates L.P. to its members, representing each such member's pro rata interest in such Accel London V Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F9 · ownership.nature: These shares are held by Accel London V L.P. Accel London V Associates L.P. is the general partner of Accel London V L.P. and has sole voting and dispositive power with regard to the shares held by Accel London V Associates L. P. Accel London V Associates L.L.C. is the general partner of Accel London V Associates L.P. and Accel London Investors 2016 L.P (together with Accel London V L.P., the "Accel London V Entities"). Accel London V Associates L.P. has sole voting and dispositive power with regard to the shares held by the Accel London V Entities. Each of Accel London V Associates L.P. and Accel London V Associates L.L.C. disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that either such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004921 · primarydocument.xml · nonDerivative · entry 3

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2016 L.L.C.

Disclosed balance after: 941,958

F5 · kind: On July 9, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 66,747 shares of Class A common stock of the Issuer to its members, representing each such member's pro rata interest in such shares. The aforementioned distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F6 · ownership.nature: These shares are held by Accel Growth Fund Investors 2016 L.L.C.

SEC source: 0001562180-21-004921 · primarydocument.xml · nonDerivative · entry 2

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund IV Strategic Partners L.P.

Disclosed balance after: 112,049

F3 · kind: On July 9, 2021, Accel Growth Fund IV Strategic Partners L.P. distributed, for no consideration, 7,939 shares of Class A common stock of the Issuer (the "Accel Growth IV SP Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV Strategic Partners L.P., representing each such partner's pro rata interest in such Accel Growth IV SP Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV SP Shares it received in the distribution by Accel Growth Fund IV Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel Growth II SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F4 · ownership.nature: These shares are held by Accel Growth Fund IV Strategic Partners L.P.

SEC source: 0001562180-21-004921 · primarydocument.xml · nonDerivative · entry 1

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund V L.P.

Disclosed balance after: 19,693,484

F1 · kind: On July 9, 2021, Accel Growth Fund IV L.P. distributed, for no consideration, 1,395,512 shares of Class A common stock of the Issuer (the "Accel Growth IV Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV L.P., representing each such partner's pro rata interest in such Accel Growth IV Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV Shares it received in the distribution by Accel Growth Fund IV L.P. to its members, representing each such member's pro rata interest in such Accel Growth IV Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: These shares are held by Accel Growth Fund IV L.P. Accel Growth Fund IV Associates L.L.C. ("Accel Growth Fund IV GP") is the general partner of each of Accel Growth Fund IV L.P. and Accel Growth Fund IV Strategic Partners L.P. (together, the "Accel Growth Fund IV Entities"). Accel Growth Fund IV GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund IV Entities. Accel Growth Fund IV GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004922 · primarydocument.xml · nonDerivative · entry 7

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 707,877

F14 · kind: Reflects shares distributed in the distributions reported herein in each case to the limited partners or members of the applicable entity for no consideration, representing each limited partner's or member's pro-rata interest in such shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0001562180-21-004922 · primarydocument.xml · nonDerivative · entry 6

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2016 L.P.

Disclosed balance after: 4,511,303

F12 · kind: On July 9, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 237,219 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London Investors 2016 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2016 L.P. to its members, representing each such member's pro rata interest in such Accel London Investors Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F13 · ownership.nature: These shares are held by Accel London Investors 2016 L.P.

SEC source: 0001562180-21-004922 · primarydocument.xml · nonDerivative · entry 5

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V Strategic Partners L.P.

Disclosed balance after: 711,216

F10 · kind: On July 9, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 37,398 shares of Class A common stock of the Issuer (the "Accel London V SP Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Strategic Partners L.P., representing each such partner's pro rata interest in such Accel London V SP Shares. On the same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V SP Shares it received in the distribution by Accel London V Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel London V SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F11 · ownership.nature: These shares are held by Accel London V Strategic Partners L.P.

SEC source: 0001562180-21-004922 · primarydocument.xml · nonDerivative · entry 4

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V L.P.

Disclosed balance after: 46,691,347

F7 · kind: On July 9, 2021, Accel London V L.P. distributed, for no consideration, 2,455,185 shares of Class A common stock of the Issuer (the "Accel London V Shares") to its limited partners and to Accel London V Associates L.P., the general partner of Accel London V L.P., representing each such partner's pro rata interest in such Accel London V Shares. On the same date, Accel London V Associates L.P. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V L.P. to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Associates L.P., representing each such partner's pro rata interest in such Accel London V Shares. Continued in footnote (8) below.

F8 · kind: Continued from footnote (7): Also on that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V Associates L.P. to its members, representing each such member's pro rata interest in such Accel London V Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F9 · ownership.nature: These shares are held by Accel London V L.P. Accel London V Associates L.P. is the general partner of Accel London V L.P. and has sole voting and dispositive power with regard to the shares held by Accel London V Associates L. P. Accel London V Associates L.L.C. is the general partner of Accel London V Associates L.P. and Accel London Investors 2016 L.P (together with Accel London V L.P., the "Accel London V Entities"). Accel London V Associates L.P. has sole voting and dispositive power with regard to the shares held by the Accel London V Entities. Each of Accel London V Associates L.P. and Accel London V Associates L.L.C. disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that either such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004922 · primarydocument.xml · nonDerivative · entry 3

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2016 L.L.C.

Disclosed balance after: 941,958

F5 · kind: On July 9, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 66,747 shares of Class A common stock of the Issuer to its members, representing each such member's pro rata interest in such shares. The aforementioned distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F6 · ownership.nature: These shares are held by Accel Growth Fund Investors 2016 L.L.C.

SEC source: 0001562180-21-004922 · primarydocument.xml · nonDerivative · entry 2

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund IV Strategic Partners L.P.

Disclosed balance after: 112,049

F3 · kind: On July 9, 2021, Accel Growth Fund IV Strategic Partners L.P. distributed, for no consideration, 7,939 shares of Class A common stock of the Issuer (the "Accel Growth IV SP Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV Strategic Partners L.P., representing each such partner's pro rata interest in such Accel Growth IV SP Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV SP Shares it received in the distribution by Accel Growth Fund IV Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel Growth II SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F4 · ownership.nature: These shares are held by Accel Growth Fund IV Strategic Partners L.P.

SEC source: 0001562180-21-004922 · primarydocument.xml · nonDerivative · entry 1

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund V L.P.

Disclosed balance after: 19,693,484

F1 · kind: On July 9, 2021, Accel Growth Fund IV L.P. distributed, for no consideration, 1,395,512 shares of Class A common stock of the Issuer (the "Accel Growth IV Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV L.P., representing each such partner's pro rata interest in such Accel Growth IV Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV Shares it received in the distribution by Accel Growth Fund IV L.P. to its members, representing each such member's pro rata interest in such Accel Growth IV Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: These shares are held by Accel Growth Fund IV L.P. Accel Growth Fund IV Associates L.L.C. ("Accel Growth Fund IV GP") is the general partner of each of Accel Growth Fund IV L.P. and Accel Growth Fund IV Strategic Partners L.P. (together, the "Accel Growth Fund IV Entities"). Accel Growth Fund IV GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund IV Entities. Accel Growth Fund IV GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004644 · primarydocument.xml · nonDerivative · entry 1

Ramani Hitesh · CIK 0001855764 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 115,678

F1 · shares: Includes 15,678 Restricted Stock Units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement. 25% of the shares underlying the RSU will vest on April 1, 2022, with the remaining shares vesting in equal quarterly installments over the next three years, subject to continuous service through each such vesting date.

SEC source: 0001562180-21-004598 · primarydocument.xml · derivative · entry 5

Gupta Ashim · CIK 0001855778 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 301,375

Underlying: Common Stock · 10,000 shares

Expires 2028-06-29

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_date: The shares underlying this stock option vest in 36 equal monthly installments beginning on February 6, 2019, subject to continuous service through each such vesting date.

SEC source: 0001562180-21-004598 · primarydocument.xml · nonDerivative · entry 3

Gupta Ashim · CIK 0001855778 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 638,091

F1 · price: The range of prices for the transactions reported were from $70.32 to $70.64. The reporting person will provide, upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price.

SEC source: 0001562180-21-004598 · primarydocument.xml · nonDerivative · entry 2

Gupta Ashim · CIK 0001855778 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 638,716

F1 · price: The range of prices for the transactions reported were from $70.32 to $70.64. The reporting person will provide, upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price.

SEC source: 0001562180-21-004598 · primarydocument.xml · nonDerivative · entry 1

Gupta Ashim · CIK 0001855778 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 648,716

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.

SEC source: 0001562180-21-004595 · primarydocument.xml · nonDerivative · entry 6

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2016 L.P.

Disclosed balance after: 4,748,522

F12 · kind: On June 28, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 237,219 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London Investors 2016 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2016 L.P. to its members, representing each such member's pro rata interest in such Accel London Investors Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F13 · ownership.nature: These shares are held by Accel London Investors 2016 L.P.

SEC source: 0001562180-21-004595 · primarydocument.xml · nonDerivative · entry 5

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V Strategic Partners L.P.

Disclosed balance after: 748,614

F10 · kind: On June 28, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 37,398 shares of Class A common stock of the Issuer (the "Accel London V SP Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Strategic Partners L.P., representing each such partner's pro rata interest in such Accel London V SP Shares. On the same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V SP Shares it received in the distribution by Accel London V Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel London V SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F11 · ownership.nature: These shares are held by Accel London V Strategic Partners L.P.

SEC source: 0001562180-21-004595 · primarydocument.xml · nonDerivative · entry 4

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V L.P.

Disclosed balance after: 49,146,532

F7 · kind: On June 28, 2021, Accel London V L.P. distributed, for no consideration, 2,455,185 shares of Class A common stock of the Issuer (the "Accel London V Shares") to its limited partners and to Accel London V Associates L.P., the general partner of Accel London V L.P., representing each such partner's pro rata interest in such Accel London V Shares. On the same date, Accel London V Associates L.P. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V L.P. to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Associates L.P., representing each such partner's pro rata interest in such Accel London V Shares. Continued in footnote (8) below.

F8 · kind: Continued from footnote (7): Also on that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V Associates L.P. to its members, representing each such member's pro rata interest in such Accel London V Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F9 · ownership.nature: These shares are held by Accel London V L.P. Accel London V Associates L.P. is the general partner of Accel London V L.P. and has sole voting and dispositive power with regard to the shares held by Accel London V Associates L. P. Accel London V Associates L.L.C. is the general partner of Accel London V Associates L.P. and Accel London Investors 2016 L.P (together with Accel London V L.P., the "Accel London V Entities"). Accel London V Associates L.P. has sole voting and dispositive power with regard to the shares held by the Accel London V Entities. Each of Accel London V Associates L.P. and Accel London V Associates L.L.C. disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that either such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004595 · primarydocument.xml · nonDerivative · entry 3

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2016 L.L.C.

Disclosed balance after: 1,008,705

F5 · kind: On June 28, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 66,747 shares of Class A common stock of the Issuer to its members, representing each such member's pro rata interest in such shares. The aforementioned distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F6 · ownership.nature: These shares are held by Accel Growth Fund Investors 2016 L.L.C.

SEC source: 0001562180-21-004595 · primarydocument.xml · nonDerivative · entry 2

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund IV Strategic Partners L.P.

Disclosed balance after: 119,988

F3 · kind: On June 28, 2021, Accel Growth Fund IV Strategic Partners L.P. distributed, for no consideration, 7,939 shares of Class A common stock of the Issuer (the "Accel Growth IV SP Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV Strategic Partners L.P., representing each such partner's pro rata interest in such Accel Growth IV SP Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV SP Shares it received in the distribution by Accel Growth Fund IV Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel Growth II SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F4 · ownership.nature: These shares are held by Accel Growth Fund IV Strategic Partners L.P.

SEC source: 0001562180-21-004595 · primarydocument.xml · nonDerivative · entry 1

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,088,996

F1 · kind: On June 28, 2021, Accel Growth Fund IV L.P. distributed, for no consideration, 1,395,512 shares of Class A common stock of the Issuer (the "Accel Growth IV Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV L.P., representing each such partner's pro rata interest in such Accel Growth IV Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV Shares it received in the distribution by Accel Growth Fund IV L.P. to its members, representing each such member's pro rata interest in such Accel Growth IV Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F2 · ownership.direct: These shares are held by Accel Growth Fund IV L.P. Accel Growth Fund IV Associates L.L.C. ("Accel Growth Fund IV GP") is the general partner of each of Accel Growth Fund IV L.P. and Accel Growth Fund IV Strategic Partners L.P. (together, the "Accel Growth Fund IV Entities"). Accel Growth Fund IV GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund IV Entities. Accel Growth Fund IV GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004597 · primarydocument.xml · nonDerivative · entry 7

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By trust

Disclosed balance after: 347,790

F14 · kind: Reflects shares distributed in the distributions reported herein in each case to the limited partners or members of the applicable entity for no consideration, representing each limited partner's or member's pro-rata interest in such shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F15 · shares: Of the shares reflected, 72,319 shares are held by The Wong Family 2006 Trust, dated 8/30/2006, and 4,866 shares are held in each of three family GST trusts. The Reporting Person disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004597 · primarydocument.xml · nonDerivative · entry 6

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2016 L.P.

Disclosed balance after: 4,748,522

F12 · kind: On June 28, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 237,219 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London Investors 2016 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2016 L.P. to its members, representing each such member's pro rata interest in such Accel London Investors Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F13 · ownership.nature: These shares are held by Accel London Investors 2016 L.P.

SEC source: 0001562180-21-004597 · primarydocument.xml · nonDerivative · entry 5

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V Strategic Partners L.P.

Disclosed balance after: 748,614

F10 · kind: On June 28, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 37,398 shares of Class A common stock of the Issuer (the "Accel London V SP Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Strategic Partners L.P., representing each such partner's pro rata interest in such Accel London V SP Shares. On the same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V SP Shares it received in the distribution by Accel London V Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel London V SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F11 · ownership.nature: These shares are held by Accel London V Strategic Partners L.P.

SEC source: 0001562180-21-004597 · primarydocument.xml · nonDerivative · entry 4

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V L.P.

Disclosed balance after: 49,146,532

F7 · kind: On June 28, 2021, Accel London V L.P. distributed, for no consideration, 2,455,185 shares of Class A common stock of the Issuer (the "Accel London V Shares") to its limited partners and to Accel London V Associates L.P., the general partner of Accel London V L.P., representing each such partner's pro rata interest in such Accel London V Shares. On the same date, Accel London V Associates L.P. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V L.P. to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Associates L.P., representing each such partner's pro rata interest in such Accel London V Shares. Continued in footnote (8) below.

F8 · kind: Continued from footnote (7): Also on that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V Associates L.P. to its members, representing each such member's pro rata interest in such Accel London V Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F9 · ownership.nature: These shares are held by Accel London V L.P. Accel London V Associates L.P. is the general partner of Accel London V L.P. and has sole voting and dispositive power with regard to the shares held by Accel London V Associates L. P. Accel London V Associates L.L.C. is the general partner of Accel London V Associates L.P. and Accel London Investors 2016 L.P (together with Accel London V L.P., the "Accel London V Entities"). Accel London V Associates L.P. has sole voting and dispositive power with regard to the shares held by the Accel London V Entities. Each of Accel London V Associates L.P. and Accel London V Associates L.L.C. disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that either such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004597 · primarydocument.xml · nonDerivative · entry 3

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2016 L.L.C.

Disclosed balance after: 1,008,705

F5 · kind: On June 28, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 66,747 shares of Class A common stock of the Issuer to its members, representing each such member's pro rata interest in such shares. The aforementioned distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F6 · ownership.nature: These shares are held by Accel Growth Fund Investors 2016 L.L.C.

SEC source: 0001562180-21-004597 · primarydocument.xml · nonDerivative · entry 2

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund IV Strategic Partners L.P.

Disclosed balance after: 119,988

F3 · kind: On June 28, 2021, Accel Growth Fund IV Strategic Partners L.P. distributed, for no consideration, 7,939 shares of Class A common stock of the Issuer (the "Accel Growth IV SP Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV Strategic Partners L.P., representing each such partner's pro rata interest in such Accel Growth IV SP Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV SP Shares it received in the distribution by Accel Growth Fund IV Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel Growth II SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F4 · ownership.nature: These shares are held by Accel Growth Fund IV Strategic Partners L.P.

SEC source: 0001562180-21-004597 · primarydocument.xml · nonDerivative · entry 1

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund V L.P.

Disclosed balance after: 21,088,996

F1 · kind: On June 28, 2021, Accel Growth Fund IV L.P. distributed, for no consideration, 1,395,512 shares of Class A common stock of the Issuer (the "Accel Growth IV Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV L.P., representing each such partner's pro rata interest in such Accel Growth IV Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV Shares it received in the distribution by Accel Growth Fund IV L.P. to its members, representing each such member's pro rata interest in such Accel Growth IV Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: These shares are held by Accel Growth Fund IV L.P. Accel Growth Fund IV Associates L.L.C. ("Accel Growth Fund IV GP") is the general partner of each of Accel Growth Fund IV L.P. and Accel Growth Fund IV Strategic Partners L.P. (together, the "Accel Growth Fund IV Entities"). Accel Growth Fund IV GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund IV Entities. Accel Growth Fund IV GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004596 · primarydocument.xml · nonDerivative · entry 7

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 568,179

F14 · kind: Reflects shares distributed in the distributions reported herein in each case to the limited partners or members of the applicable entity for no consideration, representing each limited partner's or member's pro-rata interest in such shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0001562180-21-004596 · primarydocument.xml · nonDerivative · entry 6

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2016 L.P.

Disclosed balance after: 4,748,522

F12 · kind: On June 28, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 237,219 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London Investors 2016 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2016 L.P. to its members, representing each such member's pro rata interest in such Accel London Investors Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F13 · ownership.nature: These shares are held by Accel London Investors 2016 L.P.

SEC source: 0001562180-21-004596 · primarydocument.xml · nonDerivative · entry 5

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V Strategic Partners L.P.

Disclosed balance after: 748,614

F10 · kind: On June 28, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 37,398 shares of Class A common stock of the Issuer (the "Accel London V SP Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Strategic Partners L.P., representing each such partner's pro rata interest in such Accel London V SP Shares. On the same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V SP Shares it received in the distribution by Accel London V Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel London V SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F11 · ownership.nature: These shares are held by Accel London V Strategic Partners L.P.

SEC source: 0001562180-21-004596 · primarydocument.xml · nonDerivative · entry 4

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V L.P.

Disclosed balance after: 49,146,532

F7 · kind: On June 28, 2021, Accel London V L.P. distributed, for no consideration, 2,455,185 shares of Class A common stock of the Issuer (the "Accel London V Shares") to its limited partners and to Accel London V Associates L.P., the general partner of Accel London V L.P., representing each such partner's pro rata interest in such Accel London V Shares. On the same date, Accel London V Associates L.P. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V L.P. to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Associates L.P., representing each such partner's pro rata interest in such Accel London V Shares. Continued in footnote (8) below.

F8 · kind: Continued from footnote (7): Also on that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V Associates L.P. to its members, representing each such member's pro rata interest in such Accel London V Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F9 · ownership.nature: These shares are held by Accel London V L.P. Accel London V Associates L.P. is the general partner of Accel London V L.P. and has sole voting and dispositive power with regard to the shares held by Accel London V Associates L. P. Accel London V Associates L.L.C. is the general partner of Accel London V Associates L.P. and Accel London Investors 2016 L.P (together with Accel London V L.P., the "Accel London V Entities"). Accel London V Associates L.P. has sole voting and dispositive power with regard to the shares held by the Accel London V Entities. Each of Accel London V Associates L.P. and Accel London V Associates L.L.C. disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that either such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004596 · primarydocument.xml · nonDerivative · entry 3

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2016 L.L.C.

Disclosed balance after: 1,008,705

F5 · kind: On June 28, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 66,747 shares of Class A common stock of the Issuer to its members, representing each such member's pro rata interest in such shares. The aforementioned distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F6 · ownership.nature: These shares are held by Accel Growth Fund Investors 2016 L.L.C.

SEC source: 0001562180-21-004596 · primarydocument.xml · nonDerivative · entry 2

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund IV Strategic Partners L.P.

Disclosed balance after: 119,988

F3 · kind: On June 28, 2021, Accel Growth Fund IV Strategic Partners L.P. distributed, for no consideration, 7,939 shares of Class A common stock of the Issuer (the "Accel Growth IV SP Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV Strategic Partners L.P., representing each such partner's pro rata interest in such Accel Growth IV SP Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV SP Shares it received in the distribution by Accel Growth Fund IV Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel Growth II SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F4 · ownership.nature: These shares are held by Accel Growth Fund IV Strategic Partners L.P.

SEC source: 0001562180-21-004596 · primarydocument.xml · nonDerivative · entry 1

Botteri Philippe · CIK 0001856713 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund V L.P.

Disclosed balance after: 21,088,996

F1 · kind: On June 28, 2021, Accel Growth Fund IV L.P. distributed, for no consideration, 1,395,512 shares of Class A common stock of the Issuer (the "Accel Growth IV Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV L.P., representing each such partner's pro rata interest in such Accel Growth IV Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV Shares it received in the distribution by Accel Growth Fund IV L.P. to its members, representing each such member's pro rata interest in such Accel Growth IV Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: These shares are held by Accel Growth Fund IV L.P. Accel Growth Fund IV Associates L.L.C. ("Accel Growth Fund IV GP") is the general partner of each of Accel Growth Fund IV L.P. and Accel Growth Fund IV Strategic Partners L.P. (together, the "Accel Growth Fund IV Entities"). Accel Growth Fund IV GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund IV Entities. Accel Growth Fund IV GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004492 · primarydocument.xml · nonDerivative · entry 6

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2016 L.P.

Disclosed balance after: 4,985,741

F12 · kind: On June 22, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 237,219 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London Investors 2016 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2016 L.P. to its members, representing each such member's pro rata interest in such Accel London Investors Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F13 · ownership.nature: These shares are held by Accel London Investors 2016 L.P.

SEC source: 0001562180-21-004492 · primarydocument.xml · nonDerivative · entry 5

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V Strategic Partners L.P.

Disclosed balance after: 786,012

F10 · kind: On June 22, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 37,398 shares of Class A common stock of the Issuer (the "Accel London V SP Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Strategic Partners L.P., representing each such partner's pro rata interest in such Accel London V SP Shares. On the same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V SP Shares it received in the distribution by Accel London V Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel London V SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F11 · ownership.nature: These shares are held by Accel London V Strategic Partners L.P.

SEC source: 0001562180-21-004492 · primarydocument.xml · nonDerivative · entry 4

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V L.P.

Disclosed balance after: 51,601,717

F7 · kind: On June 22, 2021, Accel London V L.P. distributed, for no consideration, 2,455,185 shares of Class A common stock of the Issuer (the "Accel London V Shares") to its limited partners and to Accel London V Associates L.P., the general partner of Accel London V L.P., representing each such partner's pro rata interest in such Accel London V Shares. On the same date, Accel London V Associates L.P. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V L.P. to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Associates L.P., representing each such partner's pro rata interest in such Accel London V Shares. Continued in footnote (8) below.

F8 · kind: Continued from footnote (7): Also on that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V Associates L.P. to its members, representing each such member's pro rata interest in such Accel London V Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F9 · ownership.nature: These shares are held by Accel London V L.P. Accel London V Associates L.P. is the general partner of Accel London V L.P. and has sole voting and dispositive power with regard to the shares held by Accel London V Associates L. P. Accel London V Associates L.L.C. is the general partner of Accel London V Associates L.P. and Accel London Investors 2016 L.P (together with Accel London V L.P., the "Accel London V Entities"). Accel London V Associates L.P. has sole voting and dispositive power with regard to the shares held by the Accel London V Entities. Each of Accel London V Associates L.P. and Accel London V Associates L.L.C. disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that either such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004492 · primarydocument.xml · nonDerivative · entry 3

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2016 L.L.C.

Disclosed balance after: 1,075,452

F5 · kind: On June 22, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 66,747 shares of Class A common stock of the Issuer to its members, representing each such member's pro rata interest in such shares. The aforementioned distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F6 · ownership.nature: These shares are held by Accel Growth Fund Investors 2016 L.L.C.

SEC source: 0001562180-21-004492 · primarydocument.xml · nonDerivative · entry 2

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund IV Strategic Partners L.P.

Disclosed balance after: 127,927

F3 · kind: On June 22, 2021, Accel Growth Fund IV Strategic Partners L.P. distributed, for no consideration, 7,939 shares of Class A common stock of the Issuer (the "Accel Growth IV SP Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV Strategic Partners L.P., representing each such partner's pro rata interest in such Accel Growth IV SP Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV SP Shares it received in the distribution by Accel Growth Fund IV Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel Growth II SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F4 · ownership.nature: These shares are held by Accel Growth Fund IV Strategic Partners L.P.

SEC source: 0001562180-21-004492 · primarydocument.xml · nonDerivative · entry 1

Accel Growth Fund IV L.P. · CIK 0001665743 · 10% owner

Accel Growth Fund IV Strategic Partners L.P. · CIK 0001673903 · 10% owner

Accel Growth Fund IV Associates L.L.C. · CIK 0001665744 · 10% owner

Accel Growth Fund Investors 2016 L.L.C. · CIK 0001761641 · 10% owner

Accel London V L.P. · CIK 0001672272 · 10% owner

Accel London V Associates L.P. · CIK 0001677591 · 10% owner

Accel London Investors 2016 L.P. · CIK 0001761735 · 10% owner

Accel London V Associates L.L.C. · CIK 0001677593 · 10% owner

Accel London V Strategic Partners L.P. · CIK 0001677178 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,484,508

F1 · kind: On June 22, 2021, Accel Growth Fund IV L.P. distributed, for no consideration, 1,395,512 shares of Class A common stock of the Issuer (the "Accel Growth IV Shares") to its limited partners and to Accel Growth Fund IV Associates L.L.C., the general partner of Accel Growth Fund IV L.P., representing each such partner's pro rata interest in such Accel Growth IV Shares. On the same date, Accel Growth Fund IV Associates L.L.C. distributed, for no consideration, the Accel Growth IV Shares it received in the distribution by Accel Growth Fund IV L.P. to its members, representing each such member's pro rata interest in such Accel Growth IV Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F2 · ownership.direct: These shares are held by Accel Growth Fund IV L.P. Accel Growth Fund IV Associates L.L.C. ("Accel Growth Fund IV GP") is the general partner of each of Accel Growth Fund IV L.P. and Accel Growth Fund IV Strategic Partners L.P. (together, the "Accel Growth Fund IV Entities"). Accel Growth Fund IV GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund IV Entities. Accel Growth Fund IV GP disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004493 · primarydocument.xml · nonDerivative · entry 7

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By trust

Disclosed balance after: 260,873

F14 · kind: Reflects shares distributed in the distributions reported herein in each case to the limited partners or members of the applicable entity for no consideration, representing each limited partner's or member's pro-rata interest in such shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F15 · shares: Of the shares reflected, 72,285 shares are held by The Wong Family 2006 Trust, dated 8/30/2006, and 4,862 shares are held in each of three family GST trusts. The Reporting Person disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004493 · primarydocument.xml · nonDerivative · entry 6

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2016 L.P.

Disclosed balance after: 4,985,741

F12 · kind: On June 22, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 237,219 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London Investors 2016 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2016 L.P. to its members, representing each such member's pro rata interest in such Accel London Investors Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F13 · ownership.nature: These shares are held by Accel London Investors 2016 L.P.

SEC source: 0001562180-21-004493 · primarydocument.xml · nonDerivative · entry 5

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V Strategic Partners L.P.

Disclosed balance after: 786,012

F10 · kind: On June 22, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 37,398 shares of Class A common stock of the Issuer (the "Accel London V SP Shares") to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Strategic Partners L.P., representing each such partner's pro rata interest in such Accel London V SP Shares. On the same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V SP Shares it received in the distribution by Accel London V Strategic Partners L.P. to its members, representing each such member's pro rata interest in such Accel London V SP Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F11 · ownership.nature: These shares are held by Accel London V Strategic Partners L.P.

SEC source: 0001562180-21-004493 · primarydocument.xml · nonDerivative · entry 4

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London V L.P.

Disclosed balance after: 51,601,717

F7 · kind: On June 22, 2021, Accel London V L.P. distributed, for no consideration, 2,455,185 shares of Class A common stock of the Issuer (the "Accel London V Shares") to its limited partners and to Accel London V Associates L.P., the general partner of Accel London V L.P., representing each such partner's pro rata interest in such Accel London V Shares. On the same date, Accel London V Associates L.P. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V L.P. to its limited partners and to Accel London V Associates L.L.C., the general partner of Accel London V Associates L.P., representing each such partner's pro rata interest in such Accel London V Shares. Continued in footnote (8) below.

F8 · kind: Continued from footnote (7): Also on that same date, Accel London V Associates L.L.C. distributed, for no consideration, the Accel London V Shares it received in the distribution by Accel London V Associates L.P. to its members, representing each such member's pro rata interest in such Accel London V Shares. All of the aforementioned distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F9 · ownership.nature: These shares are held by Accel London V L.P. Accel London V Associates L.P. is the general partner of Accel London V L.P. and has sole voting and dispositive power with regard to the shares held by Accel London V Associates L. P. Accel London V Associates L.L.C. is the general partner of Accel London V Associates L.P. and Accel London Investors 2016 L.P (together with Accel London V L.P., the "Accel London V Entities"). Accel London V Associates L.P. has sole voting and dispositive power with regard to the shares held by the Accel London V Entities. Each of Accel London V Associates L.P. and Accel London V Associates L.L.C. disclaims Section 16 beneficial ownership over the securities reported herein except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that either such reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001562180-21-004493 · primarydocument.xml · nonDerivative · entry 3

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2016 L.L.C.

Disclosed balance after: 1,075,452

F5 · kind: On June 22, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 66,747 shares of Class A common stock of the Issuer to its members, representing each such member's pro rata interest in such shares. The aforementioned distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

F6 · ownership.nature: These shares are held by Accel Growth Fund Investors 2016 L.L.C.