GANDHI SAMEER K

SEC source: 0000950103-20-006544 · dp125159_4-gandhi.xml · nonDerivative · entry 4

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 0

F7 · kind: On March 27, 2020, Accel Growth Fund II L.P. distributed, for no consideration,1,271,400 shares of Class A common stock of the Issuer (the "Accel Growth II Shares") to its limited partners and to Accel Growth Fund II Associates L.L.C., the general partner of Accel Growth Fund II L.P., representing each such partner's pro rata interest in such Accel Growth II Shares. On the same date, Accel Growth Fund II Associates L.L.C. distributed, for no consideration, the Accel Growth II Shares it received in the distribution by Accel Growth Fund II L.P. to its members, representing each such member's pro rata interest in such Accel Growth II 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 II L.P. Accel Growth Fund II Associates L.L.C. ("Accel Growth Fund II GP") is the general partner of each of Accel Growth Fund II L.P. and Accel Growth Fund II Strategic Partners L.P. (together, the "Accel Growth Fund II Entities"). Accel Growth Fund II GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund II Entities. The Reporting Person is one of six Managing Members of Accel Growth Fund II GP, who share voting and dispositive powers over the shares held by the Accel Growth Fund II Entities. Continued in footnote (17) below.

SEC source: 0000950103-20-006544 · dp125159_4-gandhi.xml · nonDerivative · entry 3

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2013 L.L.C.

Disclosed balance after: 136,500

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F4 · ownership.nature: These shares are held by Accel Growth Fund Investors 2013 L.L.C. The Reporting Person is one of six Managing Members of Accel Growth Fund Investors 2013 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-006544 · dp125159_4-gandhi.xml · nonDerivative · entry 2

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 92,100

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F3 · ownership.nature: These shares are held by Accel Growth Fund II Strategic Partners L.P.

SEC source: 0000950103-20-006544 · dp125159_4-gandhi.xml · nonDerivative · entry 1

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 1,271,400

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F2 · ownership.nature: These shares are held by Accel Growth Fund II L.P. Accel Growth Fund II Associates L.L.C. ("Accel Growth Fund II GP") is the general partner of each of Accel Growth Fund II L.P. and Accel Growth Fund II Strategic Partners L.P. (together, the "Accel Growth Fund II Entities"). Accel Growth Fund II GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund II Entities. The Reporting Person is one of six Managing Members of Accel Growth Fund II GP, who share voting and dispositive powers over the shares held by the Accel Growth Fund II Entities. Continued in footnote (17) below.

F17 · ownership.nature: Continued from footnote (2): Each of such Managing Members, the Reporting Person and Accel Growth Fund II 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 any such Managing Member, the Reporting Person or Accel Growth Fund II GP is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · derivative · entry 19

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2012 L.P.

Disclosed balance after: 75,568

Underlying: Class A common stock · 17,094 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F8 · ownership.nature: These shares are held by Accel London Investors 2012 L.P. 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: 0000950103-20-005908 · dp124548_4-gandhi.xml · derivative · entry 18

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London III L.P.

Disclosed balance after: 3,328,385

Underlying: Class A common stock · 752,906 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F7 · ownership.nature: These shares are held by Accel London III L.P. Accel London III Associates L.P. is the general partner of Accel London III L.P. and has sole voting and dispositive power with regard to the shares held by Accel London III L. P. Accel London III Associates L.L.C. is the general partner of Accel London III Associates L.P. and Accel London Investors 2012 L.P (together with Accel London III L.P., the "Accel London III Fund Entities"). Accel London III Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel London III Fund Entities. Continued in footnote (20) below.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · derivative · entry 17

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2013 L.L.C.

Disclosed balance after: 1,487,984

Underlying: Class A common stock · 339,430 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F4 · ownership.nature: These shares are held by Accel Growth Fund Investors 2013 L.L.C. The Reporting Person is one of six Managing Members of Accel Growth Fund Investors 2013 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · derivative · entry 16

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 1,003,981

Underlying: Class A common stock · 229,022 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F3 · ownership.nature: These shares are held by Accel Growth Fund II Strategic Partners L.P.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · derivative · entry 15

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 13,859,496

Underlying: Class A common stock · 3,161,548 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F2 · ownership.nature: These shares are held by Accel Growth Fund II L.P. Accel Growth Fund II Associates L.L.C. ("Accel Growth Fund II GP") is the general partner of each of Accel Growth Fund II L.P. and Accel Growth Fund II Strategic Partners L.P. (together, the "Accel Growth Fund II Entities"). Accel Growth Fund II GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund II Entities. The Reporting Person is one of six Managing Members of Accel Growth Fund II GP, who share voting and dispositive powers over the shares held by the Accel Growth Fund II Entities. Continued in footnote (19) below.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 12

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · The Potomac Trust, dated 9/21/2001

Disclosed balance after: 26,787

F16 · 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.

F17 · ownership.nature: These shares are held by The Potomac Trust, dated 9/21/2001. 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: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 11

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Potomac Investments L.P. - Fund 1

Disclosed balance after: 235,852

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 · ownership.nature: These shares are held by Potomac Investments L.P. - Fund 1. 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: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 10

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2012 L.P.

Disclosed balance after: 0

F13 · kind: On March 23, 2020, Accel London Investors 2012 L.P. distributed, for no consideration, 17,094 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London III Associates L.L.C., the general partner of Accel London Investors 2012 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London III Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2012 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.

F8 · ownership.nature: These shares are held by Accel London Investors 2012 L.P. 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: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 9

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London III L.P.

Disclosed balance after: 0

F12 · kind: On March 23, 2020, Accel London III L.P. distributed, for no consideration, 752,906 shares of Class A common stock of the Issuer (the "Accel London III Shares") to its limited partners and to Accel London III Associates L.P., the general partner of Accel London III L.P., representing each such partner's pro rata interest in such Accel London III Shares. On the same date, Accel London III Associates L.P. distributed, for no consideration, the Accel London III Shares it received in the distribution by Accel London III L.P. to its limited partners and to Accel London III Associates L.L.C., the general partner of Accel London III Associates L.P., representing each such partner's pro rata interest in such Accel London III Shares. Continued in footnote (21) below.

F21 · kind: Continued from footnote (12): Also on that same date, Accel London III Associates L.L.C. distributed, for no consideration, the Accel London III Shares it received in the distribution by Accel London III Associates L.P. to its members, representing each such member's pro rata interest in such Accel London III 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.

F7 · ownership.nature: These shares are held by Accel London III L.P. Accel London III Associates L.P. is the general partner of Accel London III L.P. and has sole voting and dispositive power with regard to the shares held by Accel London III L. P. Accel London III Associates L.L.C. is the general partner of Accel London III Associates L.P. and Accel London Investors 2012 L.P (together with Accel London III L.P., the "Accel London III Fund Entities"). Accel London III Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel London III Fund Entities. Continued in footnote (20) below.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 8

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2013 L.L.C.

Disclosed balance after: 0

F11 · kind: On March 23, 2020, Accel Growth Fund Investors 2013 L.L.C. distributed, for no consideration, 339,430 shares of Class A common stock of the Issuer to its members, representing each such 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.

F4 · ownership.nature: These shares are held by Accel Growth Fund Investors 2013 L.L.C. The Reporting Person is one of six Managing Members of Accel Growth Fund Investors 2013 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 7

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 0

F10 · kind: On March 23, 2020, Accel Growth Fund II Strategic Partners L.P. distributed, for no consideration, 229,022 shares of Class A common stock of the Issuer (the "Accel Growth II SP Shares") to its limited partners and to Accel Growth Fund II Associates L.L.C., the general partner of Accel Growth Fund II Strategic Partners L.P., representing each such partner's pro rata interest in such Accel Growth II SP Shares. On the same date, Accel Growth Fund II Associates L.L.C. distributed, for no consideration, the Accel Growth II SP Shares it received in the distribution by Accel Growth Fund II 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.

F3 · ownership.nature: These shares are held by Accel Growth Fund II Strategic Partners L.P.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 6

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 0

F9 · kind: On March 23, 2020, Accel Growth Fund II L.P. distributed, for no consideration, 3,161,548 shares of Class A common stock of the Issuer (the "Accel Growth II Shares") to its limited partners and to Accel Growth Fund II Associates L.L.C., the general partner of Accel Growth Fund II L.P., representing each such partner's pro rata interest in such Accel Growth II Shares. On the same date, Accel Growth Fund II Associates L.L.C. distributed, for no consideration, the Accel Growth II Shares it received in the distribution by Accel Growth Fund II L.P. to its members, representing each such member's pro rata interest in such Accel Growth II 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 II L.P. Accel Growth Fund II Associates L.L.C. ("Accel Growth Fund II GP") is the general partner of each of Accel Growth Fund II L.P. and Accel Growth Fund II Strategic Partners L.P. (together, the "Accel Growth Fund II Entities"). Accel Growth Fund II GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund II Entities. The Reporting Person is one of six Managing Members of Accel Growth Fund II GP, who share voting and dispositive powers over the shares held by the Accel Growth Fund II Entities. Continued in footnote (19) below.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 5

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2012 L.P.

Disclosed balance after: 17,094

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F8 · ownership.nature: These shares are held by Accel London Investors 2012 L.P. 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: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 4

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London III L.P.

Disclosed balance after: 752,906

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F7 · ownership.nature: These shares are held by Accel London III L.P. Accel London III Associates L.P. is the general partner of Accel London III L.P. and has sole voting and dispositive power with regard to the shares held by Accel London III L. P. Accel London III Associates L.L.C. is the general partner of Accel London III Associates L.P. and Accel London Investors 2012 L.P (together with Accel London III L.P., the "Accel London III Fund Entities"). Accel London III Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel London III Fund Entities. Continued in footnote (20) below.

F20 · ownership.nature: Continued from footnote (7): Each of the Reporting Person, Accel London III Associates L.P. and Accel London III 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 the Reporting Person, Accel London III Associates L.P. or Accel London III Associates L.L.C. is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 3

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2013 L.L.C.

Disclosed balance after: 339,430

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F4 · ownership.nature: These shares are held by Accel Growth Fund Investors 2013 L.L.C. The Reporting Person is one of six Managing Members of Accel Growth Fund Investors 2013 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 2

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 229,022

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F3 · ownership.nature: These shares are held by Accel Growth Fund II Strategic Partners L.P.

SEC source: 0000950103-20-005908 · dp124548_4-gandhi.xml · nonDerivative · entry 1

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 3,161,548

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F2 · ownership.nature: These shares are held by Accel Growth Fund II L.P. Accel Growth Fund II Associates L.L.C. ("Accel Growth Fund II GP") is the general partner of each of Accel Growth Fund II L.P. and Accel Growth Fund II Strategic Partners L.P. (together, the "Accel Growth Fund II Entities"). Accel Growth Fund II GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund II Entities. The Reporting Person is one of six Managing Members of Accel Growth Fund II GP, who share voting and dispositive powers over the shares held by the Accel Growth Fund II Entities. Continued in footnote (19) below.

F19 · ownership.nature: Continued from footnote (2): Each of such Managing Members, the Reporting Person and Accel Growth Fund II 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 any such Managing Member, the Reporting Person or Accel Growth Fund II GP is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000638 · dp119252_4-gandhi.xml · derivative · entry 14

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2012 L.P.

Disclosed balance after: 92,662

Underlying: Class A common stock · 11,100 shares

Expires not disclosed

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

F14 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F14 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F5 · ownership.nature: These shares are held by Accel London Investors 2012 L.P. 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: 0000950103-20-000638 · dp119252_4-gandhi.xml · derivative · entry 13

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London III L.P.

Disclosed balance after: 4,081,291

Underlying: Class A common stock · 488,900 shares

Expires not disclosed

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

F14 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F14 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F4 · ownership.nature: These shares are held by Accel London III L.P. Accel London III Associates L.P. is the general partner of Accel London III L.P. and has sole voting and dispositive power with regard to the shares held by Accel London III L. P. Accel London III Associates L.L.C. is the general partner of Accel London III Associates L.P. and Accel London Investors 2012 L.P (together with Accel London III L.P., the "Accel London III Fund Entities"). Accel London III Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel London III Fund Entities. Continued in footnote (18) below.

F18 · ownership.nature: Continued from footnote (4): Each of the Reporting Person, Accel London III Associates L.P. and Accel London III 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 the Reporting Person, Accel London III Associates L.P. or Accel London III Associates L.L.C. is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000638 · dp119252_4-gandhi.xml · derivative · entry 12

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 363,116

Underlying: Class A common stock · 45,600 shares

Expires not disclosed

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

F14 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F14 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F3 · ownership.nature: These shares are held by Accel Leaders Fund Investors 2016 L.L.C. The Reporting Person is one of six Managing Members of Accel Leaders Fund Investors 2016 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000638 · dp119252_4-gandhi.xml · derivative · entry 11

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Leaders Fund L.P.

Disclosed balance after: 7,599,936

Underlying: Class A common stock · 954,400 shares

Expires not disclosed

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

F14 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F14 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F2 · ownership.nature: These shares are held by Accel Leaders Fund L.P. Accel Leaders Fund Associates L.L.C. ("Accel Leaders Fund GP") is the general partner of Accel Leaders Fund L.P. (the "Accel Leader Fund Entity"). Accel Leaders Fund GP has sole voting and dispositive power with regard to the shares held by the Accel Leaders Fund Entity. The Reporting Person is one of six Managing Members of Accel Leaders Fund GP, who share voting and dispositive powers over the shares held by the Accel Leaders Fund Entity. Each of such Managing Members, the Reporting Person and Accel Leaders Fund 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 any such Managing Member, the Reporting Person or Accel Leaders Fund GP is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 10

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · The Potomac Trust, dated 9/21/2001

Disclosed balance after: 17,713

F12 · 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.

F13 · ownership.nature: These shares are held by The Potomac Trust, dated 9/21/2001. 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: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 9

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Potomac Investments L.P. - Fund 1

Disclosed balance after: 106,470

F10 · 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.

F11 · ownership.nature: These shares are held by Potomac Investments L.P. - Fund 1. 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: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 8

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2012 L.P.

Disclosed balance after: 0

F9 · kind: On January 10, 2020, Accel London Investors 2012 L.P. distributed, for no consideration, 11,100 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London III Associates L.L.C., the general partner of Accel London Investors 2012 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London III Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2012 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.

F5 · ownership.nature: These shares are held by Accel London Investors 2012 L.P. 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: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 7

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London III L.P.

Disclosed balance after: 0

F8 · kind: On January 10, 2020, Accel London III L.P. distributed, for no consideration, 488,900 shares of Class A common stock of the Issuer (the "Accel London III Shares") to its limited partners and to Accel London III Associates L.P., the general partner of Accel London III L.P., representing each such partner's pro rata interest in such Accel London III Shares. On the same date, Accel London III Associates L.P. distributed, for no consideration, the Accel London III Shares it received in the distribution by Accel London III L.P. to its limited partners and to Accel London III Associates L.L.C., the general partner of Accel London III Associates L.P., representing each such partner's pro rata interest in such Accel London III Shares. Continued in footnote (19) below.

F19 · kind: Continued from footnote (8): Also on that same date, Accel London III Associates L.L.C. distributed, for no consideration, the Accel London III Shares it received in the distribution by Accel London III Associates L.P. to its members, representing each such member's pro rata interest in such Accel London III 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 London III L.P. Accel London III Associates L.P. is the general partner of Accel London III L.P. and has sole voting and dispositive power with regard to the shares held by Accel London III L. P. Accel London III Associates L.L.C. is the general partner of Accel London III Associates L.P. and Accel London Investors 2012 L.P (together with Accel London III L.P., the "Accel London III Fund Entities"). Accel London III Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel London III Fund Entities. Continued in footnote (18) below.

F18 · ownership.nature: Continued from footnote (4): Each of the Reporting Person, Accel London III Associates L.P. and Accel London III 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 the Reporting Person, Accel London III Associates L.P. or Accel London III Associates L.L.C. is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 6

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 29,640

F7 · kind: On January 10, 2020, Accel Leaders Fund Investors 2016 L.L.C. distributed, for no consideration, 45,600 shares of Class A common stock of the Issuer (the "Accel Leaders Fund Investors Shares") to its members, representing each such member's pro rata interest in such Accel Leaders Fund 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.

F3 · ownership.nature: These shares are held by Accel Leaders Fund Investors 2016 L.L.C. The Reporting Person is one of six Managing Members of Accel Leaders Fund Investors 2016 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 5

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Leaders Fund L.P.

Disclosed balance after: 620,360

F6 · kind: On January 10, 2020, Accel Leaders Fund L.P. distributed, for no consideration, 954,400 shares of Class A common stock of the Issuer (the "Accel Leaders Fund Shares") to its limited partners and to Accel Leaders Fund Associates L.L.C., the general partner of Accel Leaders Fund L.P., representing each such partner's pro rata interest in such Accel Leaders Fund Shares. On the same date, Accel Leaders Fund Associates L.L.C. distributed, for no consideration, the Accel Leaders Fund Shares it received in the distribution by Accel Leaders Fund L.P. to its members, representing each such member's pro rata interest in such Accel Leaders Fund 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 Leaders Fund L.P. Accel Leaders Fund Associates L.L.C. ("Accel Leaders Fund GP") is the general partner of Accel Leaders Fund L.P. (the "Accel Leader Fund Entity"). Accel Leaders Fund GP has sole voting and dispositive power with regard to the shares held by the Accel Leaders Fund Entity. The Reporting Person is one of six Managing Members of Accel Leaders Fund GP, who share voting and dispositive powers over the shares held by the Accel Leaders Fund Entity. Each of such Managing Members, the Reporting Person and Accel Leaders Fund 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 any such Managing Member, the Reporting Person or Accel Leaders Fund GP is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 4

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2012 L.P.

Disclosed balance after: 11,100

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F5 · ownership.nature: These shares are held by Accel London Investors 2012 L.P. 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: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 3

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London III L.P.

Disclosed balance after: 488,900

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F4 · ownership.nature: These shares are held by Accel London III L.P. Accel London III Associates L.P. is the general partner of Accel London III L.P. and has sole voting and dispositive power with regard to the shares held by Accel London III L. P. Accel London III Associates L.L.C. is the general partner of Accel London III Associates L.P. and Accel London Investors 2012 L.P (together with Accel London III L.P., the "Accel London III Fund Entities"). Accel London III Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel London III Fund Entities. Continued in footnote (18) below.

F18 · ownership.nature: Continued from footnote (4): Each of the Reporting Person, Accel London III Associates L.P. and Accel London III 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 the Reporting Person, Accel London III Associates L.P. or Accel London III Associates L.L.C. is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 2

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 75,240

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F3 · ownership.nature: These shares are held by Accel Leaders Fund Investors 2016 L.L.C. The Reporting Person is one of six Managing Members of Accel Leaders Fund Investors 2016 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000638 · dp119252_4-gandhi.xml · nonDerivative · entry 1

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Leaders Fund L.P.

Disclosed balance after: 1,574,760

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F2 · ownership.nature: These shares are held by Accel Leaders Fund L.P. Accel Leaders Fund Associates L.L.C. ("Accel Leaders Fund GP") is the general partner of Accel Leaders Fund L.P. (the "Accel Leader Fund Entity"). Accel Leaders Fund GP has sole voting and dispositive power with regard to the shares held by the Accel Leaders Fund Entity. The Reporting Person is one of six Managing Members of Accel Leaders Fund GP, who share voting and dispositive powers over the shares held by the Accel Leaders Fund Entity. Each of such Managing Members, the Reporting Person and Accel Leaders Fund 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 any such Managing Member, the Reporting Person or Accel Leaders Fund GP is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · derivative · entry 19

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2012 L.P.

Disclosed balance after: 103,762

Underlying: Class A common stock · 11,100 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F22 · balance_after: Reflects a correction to the corresponding figure in the Form 4 filed for the Reporting Person on December 11, 2019, which should have reported holdings of 114,862 shares of Class B common stock for this fund.

F8 · ownership.nature: These shares are held by Accel London Investors 2012 L.P. 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: 0000950103-20-000381 · dp119001_4-gandhi.xml · derivative · entry 18

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London III L.P.

Disclosed balance after: 4,570,191

Underlying: Class A common stock · 488,900 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F7 · ownership.nature: These shares are held by Accel London III L.P. Accel London III Associates L.P. is the general partner of Accel London III L.P. and has sole voting and dispositive power with regard to the shares held by Accel London III L. P. Accel London III Associates L.L.C. is the general partner of Accel London III Associates L.P. and Accel London Investors 2012 L.P (together with Accel London III L.P., the "Accel London III Fund Entities"). Accel London III Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel London III Fund Entities. Continued in footnote (20) below.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · derivative · entry 17

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2013 L.L.C.

Disclosed balance after: 1,827,414

Underlying: Class A common stock · 91,000 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F4 · ownership.nature: These shares are held by Accel Growth Fund Investors 2013 L.L.C. The Reporting Person is one of six Managing Members of Accel Growth Fund Investors 2013 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · derivative · entry 16

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 1,233,003

Underlying: Class A common stock · 61,400 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F3 · ownership.nature: These shares are held by Accel Growth Fund II Strategic Partners L.P.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · derivative · entry 15

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 17,021,044

Underlying: Class A common stock · 847,600 shares

Expires not disclosed

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

F18 · derivative.exercise_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F18 · derivative.expiration_date: Each share of Class B common stock is convertible at any time at the option of the Reporting Person into one share of Class A common stock and has no expiration date. All shares of Class B common stock will automatically convert into shares of Class A common stock upon the occurrence of certain specified events.

F2 · ownership.nature: These shares are held by Accel Growth Fund II L.P. Accel Growth Fund II Associates L.L.C. ("Accel Growth Fund II GP") is the general partner of each of Accel Growth Fund II L.P. and Accel Growth Fund II Strategic Partners L.P. (together, the "Accel Growth Fund II Entities"). Accel Growth Fund II GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund II Entities. The Reporting Person is one of six Managing Members of Accel Growth Fund II GP, who share voting and dispositive powers over the shares held by the Accel Growth Fund II Entities. Continued in footnote (19) below.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 12

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · The Potomac Trust, dated 9/21/2001

Disclosed balance after: 11,796

F16 · 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.

F17 · ownership.nature: These shares are held by The Potomac Trust, dated 9/21/2001. 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: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 11

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Potomac Investments L.P. - Fund 1

Disclosed balance after: 69,443

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 · ownership.nature: These shares are held by Potomac Investments L.P. - Fund 1. 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: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 10

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2012 L.P.

Disclosed balance after: 0

F13 · kind: On January 3, 2020, Accel London Investors 2012 L.P. distributed, for no consideration, 11,100 shares of Class A common stock of the Issuer (the "Accel London Investors Shares") to its limited partners and to Accel London III Associates L.L.C., the general partner of Accel London Investors 2012 L.P., representing each such partner's pro rata interest in such Accel London Investors Shares. On that same date, Accel London III Associates L.L.C. distributed, for no consideration, the Accel London Investors Shares it received in the distribution by Accel London Investors 2012 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.

F8 · ownership.nature: These shares are held by Accel London Investors 2012 L.P. 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: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 9

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London III L.P.

Disclosed balance after: 0

F12 · kind: On January 3, 2020, Accel London III L.P. distributed, for no consideration, 488,900 shares of Class A common stock of the Issuer (the "Accel London III Shares") to its limited partners and to Accel London III Associates L.P., the general partner of Accel London III L.P., representing each such partner's pro rata interest in such Accel London III Shares. On the same date, Accel London III Associates L.P. distributed, for no consideration, the Accel London III Shares it received in the distribution by Accel London III L.P. to its limited partners and to Accel London III Associates L.L.C., the general partner of Accel London III Associates L.P., representing each such partner's pro rata interest in such Accel London III Shares. Continued in footnote (21) below.

F21 · kind: Continued from footnote (12): Also on that same date, Accel London III Associates L.L.C. distributed, for no consideration, the Accel London III Shares it received in the distribution by Accel London III Associates L.P. to its members, representing each such member's pro rata interest in such Accel London III 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.

F7 · ownership.nature: These shares are held by Accel London III L.P. Accel London III Associates L.P. is the general partner of Accel London III L.P. and has sole voting and dispositive power with regard to the shares held by Accel London III L. P. Accel London III Associates L.L.C. is the general partner of Accel London III Associates L.P. and Accel London Investors 2012 L.P (together with Accel London III L.P., the "Accel London III Fund Entities"). Accel London III Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel London III Fund Entities. Continued in footnote (20) below.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 8

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2013 L.L.C.

Disclosed balance after: 0

F11 · kind: On January 3, 2020, Accel Growth Fund Investors 2013 L.L.C. distributed, for no consideration, 91,000 shares of Class A common stock of the Issuer to its members, representing each such 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.

F4 · ownership.nature: These shares are held by Accel Growth Fund Investors 2013 L.L.C. The Reporting Person is one of six Managing Members of Accel Growth Fund Investors 2013 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 7

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 0

F10 · kind: On January 3, 2020, Accel Growth Fund II Strategic Partners L.P. distributed, for no consideration, 61,400 shares of Class A common stock of the Issuer (the "Accel Growth II SP Shares") to its limited partners and to Accel Growth Fund II Associates L.L.C., the general partner of Accel Growth Fund II Strategic Partners L.P., representing each such partner's pro rata interest in such Accel Growth II SP Shares. On the same date, Accel Growth Fund II Associates L.L.C. distributed, for no consideration, the Accel Growth II SP Shares it received in the distribution by Accel Growth Fund II 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.

F3 · ownership.nature: These shares are held by Accel Growth Fund II Strategic Partners L.P.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 6

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

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

Disclosed balance after: 0

F9 · kind: On January 3, 2020, Accel Growth Fund II L.P. distributed, for no consideration, 847,600 shares of Class A common stock of the Issuer (the "Accel Growth II Shares") to its limited partners and to Accel Growth Fund II Associates L.L.C., the general partner of Accel Growth Fund II L.P., representing each such partner's pro rata interest in such Accel Growth II Shares. On the same date, Accel Growth Fund II Associates L.L.C. distributed, for no consideration, the Accel Growth II Shares it received in the distribution by Accel Growth Fund II L.P. to its members, representing each such member's pro rata interest in such Accel Growth II 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 II L.P. Accel Growth Fund II Associates L.L.C. ("Accel Growth Fund II GP") is the general partner of each of Accel Growth Fund II L.P. and Accel Growth Fund II Strategic Partners L.P. (together, the "Accel Growth Fund II Entities"). Accel Growth Fund II GP has sole voting and dispositive power with regard to the shares held by the Accel Growth Fund II Entities. The Reporting Person is one of six Managing Members of Accel Growth Fund II GP, who share voting and dispositive powers over the shares held by the Accel Growth Fund II Entities. Continued in footnote (19) below.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 5

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London Investors 2012 L.P.

Disclosed balance after: 11,100

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F8 · ownership.nature: These shares are held by Accel London Investors 2012 L.P. 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: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 4

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel London III L.P.

Disclosed balance after: 488,900

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F7 · ownership.nature: These shares are held by Accel London III L.P. Accel London III Associates L.P. is the general partner of Accel London III L.P. and has sole voting and dispositive power with regard to the shares held by Accel London III L. P. Accel London III Associates L.L.C. is the general partner of Accel London III Associates L.P. and Accel London Investors 2012 L.P (together with Accel London III L.P., the "Accel London III Fund Entities"). Accel London III Associates L.L.C. has sole voting and dispositive power with regard to the shares held by the Accel London III Fund Entities. Continued in footnote (20) below.

F20 · ownership.nature: Continued from footnote (7): Each of the Reporting Person, Accel London III Associates L.P. and Accel London III 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 the Reporting Person, Accel London III Associates L.P. or Accel London III Associates L.L.C. is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000950103-20-000381 · dp119001_4-gandhi.xml · nonDerivative · entry 3

GANDHI SAMEER K · CIK 0001201326 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Accel Growth Fund Investors 2013 L.L.C.

Disclosed balance after: 91,000

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

F1 · price: Class B common stock convert into Class A common stock on a one-for-one basis.

F4 · ownership.nature: These shares are held by Accel Growth Fund Investors 2013 L.L.C. The Reporting Person is one of six Managing Members of Accel Growth Fund Investors 2013 L.L.C. who share voting and dispositive powers over such shares. Each of such Managing Members and the Reporting Person disclaims beneficial ownership over the securities herein except to the extent of their pecuniary interest therein, if any, and this report shall not be deemed an admission that any such Managing Member or the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.