AMPL

SEC source: 0001209191-21-058313 · doc4.xml · nonDerivative · entry 4

Institutional Venture Management XV, LLC · CIK 0001640275 · 10% owner

Institutional Venture Partners XV, L.P. · CIK 0001640274 · 10% owner

Chaffee Todd C · CIK 0001300134 · 10% owner

Dash Somesh · CIK 0001843938 · 10% owner

FOGELSONG NORMAN A · CIK 0001140932 · 10% owner

Harrick Stephen J · CIK 0001299975 · 10% owner

Liaw Eric · CIK 0001644264 · 10% owner

Maltz Jules A. · CIK 0001553254 · 10% owner

Miller J Sanford · CIK 0001359524 · 10% owner

Phelps Dennis B · CIK 0001299965 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 44,585

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.00 to $52.99 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV Executive Fund, L.P. ("IVP XV EF"), of which IVM XV is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058313 · doc4.xml · nonDerivative · entry 3

Institutional Venture Management XV, LLC · CIK 0001640275 · 10% owner

Institutional Venture Partners XV, L.P. · CIK 0001640274 · 10% owner

Chaffee Todd C · CIK 0001300134 · 10% owner

Dash Somesh · CIK 0001843938 · 10% owner

FOGELSONG NORMAN A · CIK 0001140932 · 10% owner

Harrick Stephen J · CIK 0001299975 · 10% owner

Liaw Eric · CIK 0001644264 · 10% owner

Maltz Jules A. · CIK 0001553254 · 10% owner

Miller J Sanford · CIK 0001359524 · 10% owner

Phelps Dennis B · CIK 0001299965 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,383,188

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.00 to $52.99 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV, L.P. (IVP XV LP"), of which Institutional Venture Management XV, LLC ("IVM XV") is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058313 · doc4.xml · nonDerivative · entry 2

Institutional Venture Management XV, LLC · CIK 0001640275 · 10% owner

Institutional Venture Partners XV, L.P. · CIK 0001640274 · 10% owner

Chaffee Todd C · CIK 0001300134 · 10% owner

Dash Somesh · CIK 0001843938 · 10% owner

FOGELSONG NORMAN A · CIK 0001140932 · 10% owner

Harrick Stephen J · CIK 0001299975 · 10% owner

Liaw Eric · CIK 0001644264 · 10% owner

Maltz Jules A. · CIK 0001553254 · 10% owner

Miller J Sanford · CIK 0001359524 · 10% owner

Phelps Dennis B · CIK 0001299965 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 45,137

F2 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV Executive Fund, L.P. ("IVP XV EF"), of which IVM XV is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058313 · doc4.xml · nonDerivative · entry 1

Institutional Venture Management XV, LLC · CIK 0001640275 · 10% owner

Institutional Venture Partners XV, L.P. · CIK 0001640274 · 10% owner

Chaffee Todd C · CIK 0001300134 · 10% owner

Dash Somesh · CIK 0001843938 · 10% owner

FOGELSONG NORMAN A · CIK 0001140932 · 10% owner

Harrick Stephen J · CIK 0001299975 · 10% owner

Liaw Eric · CIK 0001644264 · 10% owner

Maltz Jules A. · CIK 0001553254 · 10% owner

Miller J Sanford · CIK 0001359524 · 10% owner

Phelps Dennis B · CIK 0001299965 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,486,973

F1 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV, L.P. (IVP XV LP"), of which Institutional Venture Management XV, LLC ("IVM XV") is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000899243-21-038472 · doc4.xml · nonDerivative · entry 2

Liu Curtis · CIK 0001883022 · Director · Chief Technology Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By Trust

Disclosed balance after: 79,228

F1 · ownership.nature: Securities held by a trust over which the Reporting Person exercises voting and dispositive control.

SEC source: 0000899243-21-038472 · doc4.xml · nonDerivative · entry 1

Liu Curtis · CIK 0001883022 · Director · Chief Technology Officer · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By Trust

Disclosed balance after: 221,228

F1 · ownership.nature: Securities held by a trust over which the Reporting Person exercises voting and dispositive control.

SEC source: 0000899243-21-038468 · doc4.xml · derivative · entry 6

Vuong Hoang · CIK 0001883031 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,188,009

Underlying: Class A Common Stock · 175,000 shares

Expires 2029-06-04

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

F2 · derivative.exercise_date: The option is early exercisable. 1/48th of the shares subject to the option vest on each monthly anniversary measured from April 29, 2019 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested on the fourth anniversary of the Vesting Commencement Date.

SEC source: 0000899243-21-038468 · doc4.xml · nonDerivative · entry 5

Vuong Hoang · CIK 0001883031 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,999

F1 · kind: Pro rata distribution from an investment fund, of which the Reporting Person is a limited partner.

SEC source: 0000899243-21-038468 · doc4.xml · nonDerivative · entry 4

Vuong Hoang · CIK 0001883031 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,751

SEC source: 0000899243-21-038468 · doc4.xml · nonDerivative · entry 3

Vuong Hoang · CIK 0001883031 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,751

SEC source: 0000899243-21-038468 · doc4.xml · nonDerivative · entry 2

Vuong Hoang · CIK 0001883031 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,751

SEC source: 0000899243-21-038468 · doc4.xml · nonDerivative · entry 1

Vuong Hoang · CIK 0001883031 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 223,751

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

SEC source: 0000899243-21-038459 · doc4.xml · derivative · entry 3

Sarkis Ninos · CIK 0001883039 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,464

Underlying: Class A Common Stock · 18,000 shares

Expires 2030-11-10

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

F1 · derivative.exercise_date: 1/48th of the shares subject to the option vest on each monthly anniversary measured from October 26, 2020 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date.

SEC source: 0000899243-21-038459 · doc4.xml · nonDerivative · entry 2

Sarkis Ninos · CIK 0001883039 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,500

SEC source: 0000899243-21-038459 · doc4.xml · nonDerivative · entry 1

Sarkis Ninos · CIK 0001883039 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,500

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.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 10

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 39,108

F7 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by IVP XV EF to its general partner and limited partners without additional consideration. The general partner further distributed the shares received in this distribution to its members on a pro rata basis for no consideration.

F2 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV Executive Fund, L.P. ("IVP XV EF"), of which IVM XV is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 9

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 7,353,649

F6 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by IVP XV LP to its general partner and limited partners without additional consideration. The general partner further distributed the shares received in this distribution to its members on a pro rata basis for no consideration.

F1 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV, L.P. (IVP XV LP"), of which Institutional Venture Management XV, LLC ("IVM XV") is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 8

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 44,159

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $54.00 to $54.40 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV Executive Fund, L.P. ("IVP XV EF"), of which IVM XV is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 7

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,303,090

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $54.00 to $54.40 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV, L.P. (IVP XV LP"), of which Institutional Venture Management XV, LLC ("IVM XV") is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 6

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 44,216

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.00 to $53.99 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV Executive Fund, L.P. ("IVP XV EF"), of which IVM XV is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 5

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,313,830

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.00 to $53.99 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV, L.P. (IVP XV LP"), of which Institutional Venture Management XV, LLC ("IVM XV") is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 4

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 44,585

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.00 to $52.99 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV Executive Fund, L.P. ("IVP XV EF"), of which IVM XV is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 3

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,383,188

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.00 to $52.99 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F1 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV, L.P. (IVP XV LP"), of which Institutional Venture Management XV, LLC ("IVM XV") is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 2

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 45,137

F2 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV Executive Fund, L.P. ("IVP XV EF"), of which IVM XV is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0001209191-21-058315 · doc4.xml · nonDerivative · entry 1

Institutional Venture Partners XV Executive Fund, L.P. · CIK 0001661321 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,486,973

F1 · ownership.nature: These shares are owned directly by Institutional Venture Partners XV, L.P. (IVP XV LP"), of which Institutional Venture Management XV, LLC ("IVM XV") is the sole general partner and exercises voting and investment power over these shares. The managing directors of IVM XV are Todd C. Chaffee, Somesh Dash, Norman A. Fogelsong, Stephen J. Harrick, Eric Liaw, Jules A. Maltz, J. Sanford Miller and Dennis B. Phelps, Jr. The reporting persons disclaim beneficial ownership of these securities, except to the extent of their respective proportionate pecuniary interest therein and this report shall not be deemed an admission that any reporting person is the beneficial owner of such securities for Section 16 or any other purpose.

SEC source: 0000899243-21-038553 · doc4.xml · nonDerivative · entry 1

Wong Catherine · CIK 0001744910 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,000

F1 · shares: Constitute restricted stock units ("RSUs") for which the Reporting Person is entitled to receive one (1) share of Class A Common Stock for each RSU upon vesting. 1/16th of the RSUs vest on each quarterly anniversary of May 15, 2021, beginning August 15, 2021, subject to the Reporting Person's continued service to the Issuer.

F2 · balance_after: Includes 117,188 RSUs.

SEC source: 0001104659-21-121454 · tm2128971-2_4seq1.xml · derivative · entry 7

Vishria Eric · CIK 0001617474 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 12,264,298

Underlying: Class A Common Stock · 1,473,570 shares

Expires not disclosed

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

F7 · derivative.exercise_price: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F7 · derivative.exercise_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F7 · derivative.expiration_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121454 · tm2128971-2_4seq1.xml · nonDerivative · entry 6

Vishria Eric · CIK 0001617474 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 91,272

F5 · kind: Represents a pro-rata, in-kind distribution by BCP VIII and its affiliated funds, not for additional consideration, to BCMC VIII and its respective members and assignees.

F6 · ownership.nature: Shares are held by entities controlled by the reporting person.

SEC source: 0001104659-21-121454 · tm2128971-2_4seq1.xml · nonDerivative · entry 5

Vishria Eric · CIK 0001617474 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F5 · kind: Represents a pro-rata, in-kind distribution by BCP VIII and its affiliated funds, not for additional consideration, to BCMC VIII and its respective members and assignees.

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121454 · tm2128971-2_4seq1.xml · nonDerivative · entry 4

Vishria Eric · CIK 0001617474 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 2,000,000

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.

F4 · kind: Conversion of a derivative security in accordance of its terms.

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121454 · tm2128971-2_4seq1.xml · nonDerivative · entry 3

Vishria Eric · CIK 0001617474 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 526,430

F3 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on September 28, 2021. The actual sale prices ranged from a low of $54.01 to a high of $54.68, inclusive. The Reporting Person undertakes to provide upon request of the SEC Staff, Amplitude, Inc. or any security holder of Amplitude, Inc. full information regarding the number of shares sold at each price within the range. The amount reflected has been rounded to 4 decimal points.

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121454 · tm2128971-2_4seq1.xml · nonDerivative · entry 2

Vishria Eric · CIK 0001617474 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 726,430

F2 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on September 28, 2021. The actual sale prices ranged from a low of $53 to a high of $53.85, inclusive. The Reporting Person undertakes to provide upon request of the SEC Staff, Amplitude, Inc. or any security holder of Amplitude, Inc. full information regarding the number of shares sold at each price within the range. The amount reflected has been rounded to 4 decimal points.

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121454 · tm2128971-2_4seq1.xml · nonDerivative · entry 1

Vishria Eric · CIK 0001617474 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 926,430

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121453 · tm2128971-1_4seq1.xml · derivative · entry 6

Benchmark Capital Management Co. VIII, L.L.C. · CIK 0001593049 · 10% owner

Benchmark Capital Partners VIII, L.P. · CIK 0001593052 · 10% owner

Benchmark Founders' Fund VIII, L.P. · CIK 0001597415 · 10% owner

Benchmark Founders' Fund VIII-B, L.P. · CIK 0001597399 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 12,264,298

Underlying: Class A Common Stock · 1,473,570 shares

Expires not disclosed

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

F6 · derivative.exercise_price: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F6 · derivative.exercise_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F6 · derivative.expiration_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121453 · tm2128971-1_4seq1.xml · nonDerivative · entry 5

Benchmark Capital Management Co. VIII, L.L.C. · CIK 0001593049 · 10% owner

Benchmark Capital Partners VIII, L.P. · CIK 0001593052 · 10% owner

Benchmark Founders' Fund VIII, L.P. · CIK 0001597415 · 10% owner

Benchmark Founders' Fund VIII-B, L.P. · CIK 0001597399 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F5 · kind: Represents a pro-rata, in-kind distribution by BCP VIII and its affiliated funds, not for additional consideration, to BCMC VIII and its respective members and assignees.

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121453 · tm2128971-1_4seq1.xml · nonDerivative · entry 4

Benchmark Capital Management Co. VIII, L.L.C. · CIK 0001593049 · 10% owner

Benchmark Capital Partners VIII, L.P. · CIK 0001593052 · 10% owner

Benchmark Founders' Fund VIII, L.P. · CIK 0001597415 · 10% owner

Benchmark Founders' Fund VIII-B, L.P. · CIK 0001597399 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 2,000,000

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.

F4 · kind: Conversion of a derivative security in accordance of its terms.

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121453 · tm2128971-1_4seq1.xml · nonDerivative · entry 3

Benchmark Capital Management Co. VIII, L.L.C. · CIK 0001593049 · 10% owner

Benchmark Capital Partners VIII, L.P. · CIK 0001593052 · 10% owner

Benchmark Founders' Fund VIII, L.P. · CIK 0001597415 · 10% owner

Benchmark Founders' Fund VIII-B, L.P. · CIK 0001597399 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 526,430

F3 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on September 28, 2021. The actual sale prices ranged from a low of $54.01 to a high of $54.68, inclusive. Each Reporting Person undertakes to provide upon request of the SEC Staff, Amplitude, Inc. or any security holder of Amplitude, Inc. full information regarding the number of shares sold at each price within the range. The amount reflected has been rounded to 4 decimal points.

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121453 · tm2128971-1_4seq1.xml · nonDerivative · entry 2

Benchmark Capital Management Co. VIII, L.L.C. · CIK 0001593049 · 10% owner

Benchmark Capital Partners VIII, L.P. · CIK 0001593052 · 10% owner

Benchmark Founders' Fund VIII, L.P. · CIK 0001597415 · 10% owner

Benchmark Founders' Fund VIII-B, L.P. · CIK 0001597399 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 726,430

F2 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on September 28, 2021. The actual sale prices ranged from a low of $53 to a high of $53.85, inclusive. Each Reporting Person undertakes to provide upon request of the SEC Staff, Amplitude, Inc. or any security holder of Amplitude, Inc. full information regarding the number of shares sold at each price within the range. The amount reflected has been rounded to 4 decimal points.

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-121453 · tm2128971-1_4seq1.xml · nonDerivative · entry 1

Benchmark Capital Management Co. VIII, L.L.C. · CIK 0001593049 · 10% owner

Benchmark Capital Partners VIII, L.P. · CIK 0001593052 · 10% owner

Benchmark Founders' Fund VIII, L.P. · CIK 0001597415 · 10% owner

Benchmark Founders' Fund VIII-B, L.P. · CIK 0001597399 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 926,430

F1 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII") and Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0000899243-21-038465 · doc4.xml · nonDerivative · entry 1

Whitehurst James M · CIK 0001292272 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,000

F1 · shares: Constitute restricted stock units ("RSUs") for which the Reporting Person is entitled to receive one (1) share of Class A Common Stock for each RSU upon vesting. 1/16th of the RSUs vest on each quarterly anniversary of August 15, 2021, beginning November 15, 2021, subject to the Reporting Person's continued service to the Issuer.

F2 · balance_after: Includes 125,000 RSUs.

SEC source: 0001062993-21-009013 · form4.xml · nonDerivative · entry 1

SC US (TTGP), LTD. · CIK 0001607841 · 10% owner

SC U.S. VENTURE 2010 MANAGEMENT, L.P. · CIK 0001611355 · 10% owner

SEQUOIA CAPITAL U.S. VENTURE 2010-SEED FUND, L.P. · CIK 0001563112 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · Sequoia Capital U.S. Venture 2010 - Seed Fund, L.P

Disclosed balance after: 235,201

F1 · kind: These shares were received by Sequoia Capital U.S. Venture 2010-Seed Fund L.P. as part of a pro rata distribution-in-kind to the limited partners of an investment fund.

F2 · ownership.nature: SC US (TTGP), Ltd. is the general partner of SC U.S. Venture 2010 Management, L.P., which is the general partner of Sequoia Capital U.S. Venture 2010-Seed Fund, L.P. Each of SC US (TTGP), Ltd. and SC U.S. Venture 2010 Management, L.P. disclaims beneficial ownership of the shares held by Sequoia Capital U.S. Venture 2010-Seed Fund, L.P. except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0001062993-21-009012 · form4.xml · nonDerivative · entry 1

Grady Patrick W · CIK 0001700423 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · Sequoia Capital U.S. Venture 2010 - Seed Fund, L.P

Disclosed balance after: 235,201

F1 · kind: These shares were received by Sequoia Capital U.S. Venture 2010-Seed Fund L.P. as part of a pro rata distribution-in-kind to the limited partners of an investment fund.

F2 · ownership.nature: SC US (TTGP), Ltd. is the general partner of SC U.S. Venture 2010 Management, L.P., which is the general partner of Sequoia Capital U.S. Venture 2010-Seed Fund, L.P. The Reporting Person is a Director of SC US (TTGP), Ltd. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

SEC source: 0001104659-21-119441 · tm2128369d2_4.xml · derivative · entry 2

SPURLOCK STEVEN M · CIK 0001190193 · 10% owner

Cohler Matt · CIK 0001572685 · 10% owner

FENTON PETER H · CIK 0001219230 · 10% owner

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

Hu An-Yen · CIK 0001825956 · 10% owner

LASKY MITCHELL · CIK 0001091435 · 10% owner

Puttagunta Chetan · CIK 0001695859 · 10% owner

Tavel Sarah E · CIK 0001774645 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 13,737,868

Underlying: Class A Common Stock · 1,526,430 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.

F3 · derivative.exercise_price: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F3 · derivative.exercise_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F3 · derivative.expiration_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F2 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII"), Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-119441 · tm2128369d2_4.xml · nonDerivative · entry 1

SPURLOCK STEVEN M · CIK 0001190193 · 10% owner

Cohler Matt · CIK 0001572685 · 10% owner

FENTON PETER H · CIK 0001219230 · 10% owner

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

Hu An-Yen · CIK 0001825956 · 10% owner

LASKY MITCHELL · CIK 0001091435 · 10% owner

Puttagunta Chetan · CIK 0001695859 · 10% owner

Tavel Sarah E · CIK 0001774645 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,526,430

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 · kind: Conversion of a derivative security in accordance of its terms.

F2 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII"), Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0000899243-21-037672 · doc4.xml · derivative · entry 2

Sarkis Ninos · CIK 0001883039 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 27,500 shares

Expires not disclosed

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

F1 · derivative.exercise_price: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F1 · derivative.exercise_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F1 · derivative.expiration_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

SEC source: 0000899243-21-037672 · doc4.xml · nonDerivative · entry 1

Sarkis Ninos · CIK 0001883039 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,500

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: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

SEC source: 0001104659-21-119443 · tm2128369d3_4.xml · derivative · entry 2

Benchmark Capital Management Co. VIII, L.L.C. · CIK 0001593049 · 10% owner

Benchmark Capital Partners VIII, L.P. · CIK 0001593052 · 10% owner

Benchmark Founders' Fund VIII, L.P. · CIK 0001597415 · 10% owner

Benchmark Founders' Fund VIII-B, L.P. · CIK 0001597399 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 13,737,868

Underlying: Class A Common Stock · 1,526,430 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.

F3 · derivative.exercise_price: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F3 · derivative.exercise_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F3 · derivative.expiration_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F2 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII"), Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-119443 · tm2128369d3_4.xml · nonDerivative · entry 1

Benchmark Capital Management Co. VIII, L.L.C. · CIK 0001593049 · 10% owner

Benchmark Capital Partners VIII, L.P. · CIK 0001593052 · 10% owner

Benchmark Founders' Fund VIII, L.P. · CIK 0001597415 · 10% owner

Benchmark Founders' Fund VIII-B, L.P. · CIK 0001597399 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,526,430

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 · kind: Conversion of a derivative security in accordance of its terms.

F2 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII"), Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-119439 · tm2128369d1_4.xml · derivative · entry 2

Vishria Eric · CIK 0001617474 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 13,737,868

Underlying: Class A Common Stock · 1,526,430 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.

F3 · derivative.exercise_price: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F3 · derivative.exercise_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F3 · derivative.expiration_date: The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions or (b) the date that is six months following the date on which none of the Issuer's founders is an employee or director of the Issuer (unless a founder has rejoined the Issuer during such six-month period).

F2 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII"), Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.

SEC source: 0001104659-21-119439 · tm2128369d1_4.xml · nonDerivative · entry 1

Vishria Eric · CIK 0001617474 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,526,430

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 · kind: Conversion of a derivative security in accordance of its terms.

F2 · ownership.nature: Shares are held directly by Benchmark Capital Partners VIII, L.P. ("BCP VIII") for itself and as nominee for Benchmark Founders' Fund VIII, L.P. ("BFF VIII"), Benchmark Founders' Fund VIII-B, L.P. ("BFF VIII-B"). Benchmark Capital Management Co. VIII, L.L.C. ("BCMC VIII"), the general partner of BCP VIII, BFF VIII and BFF VIII-B, may be deemed to have sole voting and dispositive power over the securities. Eric Vishria, a member of the Issuer's board of directors, Matthew R. Cohler, Peter H. Fenton, J. William Gurley, An-Yen Hu, Mitchell H. Lasky, Chetan Puttagunta, Steven M. Spurlock and Sarah E. Tavel are the managing members of BCMC VIII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities.