Wong Rich

SEC source: 0001562180-21-006383 · 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: 37,922,833

F7 · kind: On October 5, 2021, Accel London V L.P. distributed, for no consideration, 2,922,838 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: 0001562180-21-006383 · 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: 703,575

F5 · kind: On October 5, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 79,461 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: 0001562180-21-006383 · 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: 83,696

F3 · kind: On October 5, 2021, Accel Growth Fund IV Strategic Partners L.P. distributed, for no consideration, 9,451 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: 0001562180-21-006383 · 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: 14,709,512

F1 · kind: On October 5, 2021, Accel Growth Fund IV L.P. distributed, for no consideration, 1,661,324 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: 0001562180-21-006157 · primarydocument.xml · nonDerivative · entry 7

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By trust

Disclosed balance after: 599,800

F14 · shares: Shares reflect 102,632 shares held by The Wong Family 2006 Trust, dated 8/30/2006, and several 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: 0001562180-21-006157 · 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: 3,946,495

F12 · kind: On September 27, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 282,404 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: 0001562180-21-006157 · 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: 622,172

F10 · kind: On September 27, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 44,522 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: 0001562180-21-006157 · 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: 40,845,671

F7 · kind: On September 27, 2021, Accel London V L.P. distributed, for no consideration, 2,922,838 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: 0001562180-21-006157 · 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: 783,036

F5 · kind: On September 27, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 79,461 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: 0001562180-21-006157 · 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: 93,147

F3 · kind: On September 27, 2021, Accel Growth Fund IV Strategic Partners L.P. distributed, for no consideration, 9,451 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: 0001562180-21-006157 · 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: 16,370,836

F1 · kind: On September 27, 2021, Accel Growth Fund IV L.P. distributed, for no consideration, 1,661,324 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: 0001562180-21-006075 · primarydocument.xml · nonDerivative · entry 7

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By trust

Disclosed balance after: 497,168

F14 · shares: Shares reflect 102,556 shares held by The Wong Family 2006 Trust, dated 8/30/2006, and several 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: 0001562180-21-006075 · 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: 4,228,899

F12 · kind: On September 21, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 282,404 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: 0001562180-21-006075 · 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: 666,694

F10 · kind: On September 21, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 44,522 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: 0001562180-21-006075 · 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: 43,768,509

F7 · kind: On September 21, 2021, Accel London V L.P. distributed, for no consideration, 2,922,838 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: 0001562180-21-006075 · 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: 862,497

F5 · kind: On September 21, 2021, Accel Growth Fund Investors 2016 L.L.C. distributed, for no consideration, 79,461 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: 0001562180-21-006075 · 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: 102,598

F3 · kind: On September 21, 2021, Accel Growth Fund IV Strategic Partners L.P. distributed, for no consideration, 9,451 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: 0001562180-21-006075 · 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: 18,032,160

F1 · kind: On September 21, 2021, Accel Growth Fund IV L.P. distributed, for no consideration, 1,661,324 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.

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: 0001562180-21-005620 · primarydocument.xml · nonDerivative · entry 1

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By trust

Disclosed balance after: 394,612

F1 · kind: These shares were sold in compliance with a qualified selling plan adopted by the reporting person pursuant to Rule 10b5-1 promulgated under the Securities Exchange Act of 1934, as amended.

F2 · price: The range of prices for the transactions reported were from $62.9500 to $63.4300. 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.

F3 · ownership.direct: By family trust

F4 · ownership.nature: The shares are held by The Wong Family 2006 Trust, dated 8/30/2006. 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 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: 0001562180-21-004597 · 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: 0001562180-21-004493 · 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.

SEC source: 0001562180-21-004493 · 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: 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: 0001562180-21-004493 · 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: 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.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: 0001562180-21-004371 · primarydocument.xml · nonDerivative · entry 7

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By trust

Disclosed balance after: 174,002

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, 71,359 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: 0001562180-21-004371 · 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: 5,222,960

F12 · kind: On June 15, 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: 0001562180-21-004371 · 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: 823,410

F10 · kind: On June 15, 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: 0001562180-21-004371 · 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: 54,056,902

F7 · kind: On June 15, 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: 0001562180-21-004371 · 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: 1,142,199

F5 · kind: On June 15, 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: 0001562180-21-004371 · 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: 135,866

F3 · kind: On June 15, 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: 0001562180-21-004371 · 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: 23,880,020

F1 · kind: On June 15, 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: 0001562180-21-004243 · primarydocument.xml · nonDerivative · entry 7

Wong Rich · CIK 0001536302 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By trust

Disclosed balance after: 88,057

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, 73,132 shares are held by The Wong Family 2006 Trust, dated 8/30/2006, and 4,975 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: 0001562180-21-004243 · 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: 5,460,179

F12 · kind: On June 10, 2021, Accel London Investors 2016 L.P. distributed, for no consideration, 242,867 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: 0001562180-21-004243 · 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: 860,808

F10 · kind: On June 10, 2021, Accel London V Strategic Partners L.P. distributed, for no consideration, 38,289 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.