AMPL

SEC source: 0001209191-21-067272 · doc4.xml · nonDerivative · entry 1

Battery Management Corp. · CIK 0001548594 · 10% owner

BROWN MICHAEL MAURICE · CIK 0001354614 · 10% owner

Feldman Jesse · CIK 0001568322 · 10% owner

FLEISCHER RUSSELL L · CIK 0001108424 · 10% owner

Lee Roger H · CIK 0001404868 · 10% owner

Stoner Chelsea R. · CIK 0001741527 · 10% owner

Thakker Dharmesh · CIK 0001869544 · 10% owner

TOBIN SCOTT R · CIK 0001199926 · 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: 19,373

F1 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Investment Partners XI, LLC to its members without additional consideration.

F2 · ownership.nature: Shares held by Battery Investment Partners XI, LLC ("BIP XI"). Battery Partners XI, LLC ("BP XI") is the managing member of BIP XI and may be deemed to beneficially own the shares held by BIP XI. BP XI's investment adviser is Battery Management Corp. Neeraj Agrawal, Michael Brown, Jesse Feldman, Russell Fleischer, Roger Lee, Chelsea Stoner, Dharmesh Thakker, and Scott Tobin (collectively the "BP XI Managing Members") are the managing members of BP XI and may be deemed to share voting and dispositive power over the securities held by BIP XI. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 10

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,930

F17 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.00 to $71.64 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.

F18 · balance_after: Reflects receipt of shares in the distribution in kind described in footnotes (1), (13) and (16).

F19 · ownership.direct: Shares are held by Jesse Feldman.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 9

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 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

F16 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by BP XI SF to its members without consideration.

F15 · ownership.nature: Shares held by BP XI SF. BP XI SF's investment adviser is Battery Management Corp. The BP XI Managing Members are the managing members of BP XI SF and may be deemed to share voting and dispositive power over the securities held by BP XI. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 8

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 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: 150,939

F14 · kind: Represents receipt of shares in the distribution in kind described in footnotes (5) and (9).

F15 · ownership.nature: Shares held by BP XI SF. BP XI SF's investment adviser is Battery Management Corp. The BP XI Managing Members are the managing members of BP XI SF and may be deemed to share voting and dispositive power over the securities held by BP XI. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 7

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 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

F13 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by BP XI to its members without consideration.

F12 · ownership.nature: Shares held by BP XI. BP XI's investment adviser is Battery Management Corp. The BP XI Managing Members are the managing members of BP XI and may be deemed to share voting and dispositive power over the securities held by BP XI. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 6

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 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: 150,939

F11 · kind: Represents receipt of shares in the distribution in kind described in footnotes (1), (3) and (7).

F12 · ownership.nature: Shares held by BP XI. BP XI's investment adviser is Battery Management Corp. The BP XI Managing Members are the managing members of BP XI and may be deemed to share voting and dispositive power over the securities held by BP XI. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 5

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 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: 94,176

F9 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Ventures XI-B Side Fund, L.P. to its general partner and limited partners without additional consideration.

F10 · ownership.nature: Shares held by Battery Ventures XI-B Side Fund, L.P. ("BV XI-B SF"). BP XI SF is the general partner of BV XI-B SF and may be deemed to beneficially own the shares held by BV XI-B SF. BP XI SF's investment adviser is Battery Management Corp. The BP XI Managing Members are the managing members of BP XI SF and may be deemed to share voting and dispositive power over the securities held by BP XI-B SF. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 4

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 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: 110,454

F7 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Ventures XI-B, L.P. to its general partner and limited partners without additional consideration.

F8 · ownership.nature: Shares held by Battery Ventures XI-B, L.P. ("BV XI-B"). BP XI is the general partner of BV XI-B and may be deemed to beneficially own the shares held by BV XI-B. BP XI 's investment adviser is Battery Management Corp. The BP XI Managing Members are the managing members of BP XI and may be deemed to share voting and dispositive power over the securities held by BP XI-B. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 3

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 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: 434,310

F5 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Ventures XI-A Side Fund, L.P. to its general partner and limited partners without additional consideration.

F6 · ownership.nature: Shares held by Battery Ventures XI-A Side Fund, L.P. ("BV XI-A SF"). Battery Partners XI Side Fund, LLC ("BP XI SF") is the general partner of BV XI-A SF and may be deemed to beneficially own the shares held by BV XI-A SF. BP XI SF's investment adviser is Battery Management Corp. The BP XI Managing Members are the managing members of BP XI SF and may be deemed to share voting and dispositive power over the securities held by BP XI-A SF. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 2

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 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: 418,032

F3 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Ventures XI-A, L.P. to its general partner and limited partners without additional consideration.

F4 · ownership.nature: Shares held by Battery Ventures XI-A, L.P. ("BV XI-A"). BP XI is the general partner of BV XI-A and may be deemed to beneficially own the shares held by BV XI-A. BP XI's investment adviser is Battery Management Corp. The BP XI Managing Members are the managing members of BP XI and may be deemed to share voting and dispositive power over the securities held by BP XI-A. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001209191-21-067268 · doc4.xml · nonDerivative · entry 1

Battery Partners XI, LLC · CIK 0001870316 · 10% owner

Battery Partners XI Side Fund, LLC · CIK 0001869817 · 10% owner

Battery Investment Partners XI, LLC · CIK 0001665602 · 10% owner

Battery Ventures XI-A Side Fund, L.P. · CIK 0001665600 · 10% owner

Battery Ventures XI-A, L.P. · CIK 0001665603 · 10% owner

Battery Ventures XI-B Side Fund, L.P. · CIK 0001665599 · 10% owner

Battery Ventures XI-B, L.P. · CIK 0001665601 · 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: 19,373

F1 · kind: Represents a pro rata, in-kind distribution, and not a purchase or sale of securities, by Battery Investment Partners XI, LLC to its members without additional consideration.

F2 · ownership.nature: Shares held by Battery Investment Partners XI, LLC ("BIP XI"). Battery Partners XI, LLC ("BP XI") is the managing member of BIP XI and may be deemed to beneficially own the shares held by BIP XI. BP XI's investment adviser is Battery Management Corp. Neeraj Agrawal, Michael Brown, Jesse Feldman, Russell Fleischer, Roger Lee, Chelsea Stoner, Dharmesh Thakker, and Scott Tobin (collectively the "BP XI Managing Members") are the managing members of BP XI and may be deemed to share voting and dispositive power over the securities held by BIP XI. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of his, her or 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 of for any other purpose. Mr. Agrawal is a director of the Issuer and files separate Section 16 reports.

SEC source: 0001104659-21-145480 · tm2134332d1_4.xml · nonDerivative · entry 1

FENTON PETER H · CIK 0001219230 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 149,520

F1 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 29, 2021. The actual sale prices ranged from a low of $71.12 to a high of $71.96, 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.

F2 · ownership.nature: Shares are held by Peter H. Fenton's trust entities.

SEC source: 0001209191-21-066657 · doc4.xml · nonDerivative · entry 3

Feldman Jesse · CIK 0001568322 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,641

F2 · balance_after: The shares held by the Reporting Person prior to the transactions reported herein reflect the receipt of shares pursuant to a pro rata distribution in kind, effected by Battery Investment Partners XI, LLC ("BIP XI") to its members for no additional consideration, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

F3 · balance_after: The shares held by the Reporting Person prior to the transactions reported herein include the receipt of shares pursuant to pro rata distributions in kind, effected by each of Battery Ventures XI-A, L.P. ("BV XI-A") and Battery Ventures XI-B, L.P. ("BV XI-B") to its general partner and limited partners for no additional consideration, and the further pro rata distribution in kind by the general partner of BV XI-A and BV XI-B , for no additional consideration to its members, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

F4 · balance_after: The shares held by the Reporting Person prior to the transactions reported herein include the receipt of shares pursuant to pro rata distributions in kind, effected by each of Battery Ventures XI-A Side Fund, L.P. ("BV XI-A SF") and Battery Ventures XI-B Side Fund, L.P. ("BV XI-B SF") to its general partner and limited partners for no additional consideration, and the further pro rata distribution in kind by the general partner of BV XI-A SF and BV XI-B SF, for no additional consideration to its members, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

SEC source: 0001562180-21-007286 · primarydocument.xml · nonDerivative · entry 1

Wong Catherine · CIK 0001744910 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 117,970

F1 · kind: Shares sold to satisfy tax obligations in connection with the vesting of Restricted Stock Units ("RSUs").

F2 · balance_after: Includes 109,375 RSUs.

SEC source: 0001104659-21-143953 · tm2133999-1_4seq1.xml · nonDerivative · entry 5

Cohler Matt · CIK 0001572685 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 188,753

F6 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 23, 2021. The actual sale prices ranged from a low of $69.54 to a high of $70.22, 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.

F2 · ownership.nature: Shares are held by Matthew Cohler's trust entity.

SEC source: 0001104659-21-143953 · tm2133999-1_4seq1.xml · nonDerivative · entry 4

Cohler Matt · CIK 0001572685 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 189,853

F5 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 23, 2021. The actual sale prices ranged from a low of $68.14 to a high of $68.74, 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.

F2 · ownership.nature: Shares are held by Matthew Cohler's trust entity.

SEC source: 0001104659-21-143953 · tm2133999-1_4seq1.xml · nonDerivative · entry 3

Cohler Matt · CIK 0001572685 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 201,381

F4 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 23, 2021. The actual sale prices ranged from a low of $67.14 to a high of $68.13, 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.

F2 · ownership.nature: Shares are held by Matthew Cohler's trust entity.

SEC source: 0001104659-21-143953 · tm2133999-1_4seq1.xml · nonDerivative · entry 2

Cohler Matt · CIK 0001572685 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 211,421

F3 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 23, 2021. The actual sale prices ranged from a low of $66.13 to a high of $67.11, 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.

F2 · ownership.nature: Shares are held by Matthew Cohler's trust entity.

SEC source: 0001104659-21-143953 · tm2133999-1_4seq1.xml · nonDerivative · entry 1

Cohler Matt · CIK 0001572685 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 218,154

F1 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 23, 2021. The actual sale prices ranged from a low of $65.13 to a high of $66.11, 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.

F2 · ownership.nature: Shares are held by Matthew Cohler's trust entity.

SEC source: 0001209191-21-065991 · doc4.xml · nonDerivative · entry 2

Phelps Dennis B · CIK 0001299965 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,510

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.91 to $69.05 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.

SEC source: 0001209191-21-065991 · doc4.xml · nonDerivative · entry 1

Phelps Dennis B · CIK 0001299965 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,616

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.93 to $68.91 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 · balance_after: The shares held directly by the Reporting Person prior to the transactions reported herein reflect the receipt of shares pursuant to pro rata distributions in kind, effected by Institutional Venture Partners XV, L.P. ("IVP XV LP") to its general partner and limited partners for no additional consideration, and the further pro rata distribution in kind by the general partner of IVP XV LP, for no additional consideration to its members, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

SEC source: 0001209191-21-066657 · doc4.xml · nonDerivative · entry 2

Feldman Jesse · CIK 0001568322 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · By Trust

Disclosed balance after: 0

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.80 to $69.07 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 · balance_after: The shares held by the Reporting Person prior to the transactions reported herein reflect the receipt of shares pursuant to a pro rata distribution in kind, effected by Battery Investment Partners XI, LLC ("BIP XI") to its members for no additional consideration, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

F3 · balance_after: The shares held by the Reporting Person prior to the transactions reported herein include the receipt of shares pursuant to pro rata distributions in kind, effected by each of Battery Ventures XI-A, L.P. ("BV XI-A") and Battery Ventures XI-B, L.P. ("BV XI-B") to its general partner and limited partners for no additional consideration, and the further pro rata distribution in kind by the general partner of BV XI-A and BV XI-B , for no additional consideration to its members, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

F4 · balance_after: The shares held by the Reporting Person prior to the transactions reported herein include the receipt of shares pursuant to pro rata distributions in kind, effected by each of Battery Ventures XI-A Side Fund, L.P. ("BV XI-A SF") and Battery Ventures XI-B Side Fund, L.P. ("BV XI-B SF") to its general partner and limited partners for no additional consideration, and the further pro rata distribution in kind by the general partner of BV XI-A SF and BV XI-B SF, for no additional consideration to its members, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

F5 · ownership.nature: Shares are held by The Jesse Feldman Irrevocable Trust of 2016 (the "Trust"), of which the Reporting Person's spouse is the trustee. The Reporting Person disclaims beneficial ownership of the shares held by the Trust except to the extent of his proportionate pecuniary interest therein.

SEC source: 0001209191-21-066657 · doc4.xml · nonDerivative · entry 1

Feldman Jesse · CIK 0001568322 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,741

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.80 to $69.07 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 · balance_after: The shares held by the Reporting Person prior to the transactions reported herein reflect the receipt of shares pursuant to a pro rata distribution in kind, effected by Battery Investment Partners XI, LLC ("BIP XI") to its members for no additional consideration, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

F3 · balance_after: The shares held by the Reporting Person prior to the transactions reported herein include the receipt of shares pursuant to pro rata distributions in kind, effected by each of Battery Ventures XI-A, L.P. ("BV XI-A") and Battery Ventures XI-B, L.P. ("BV XI-B") to its general partner and limited partners for no additional consideration, and the further pro rata distribution in kind by the general partner of BV XI-A and BV XI-B , for no additional consideration to its members, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

F4 · balance_after: The shares held by the Reporting Person prior to the transactions reported herein include the receipt of shares pursuant to pro rata distributions in kind, effected by each of Battery Ventures XI-A Side Fund, L.P. ("BV XI-A SF") and Battery Ventures XI-B Side Fund, L.P. ("BV XI-B SF") to its general partner and limited partners for no additional consideration, and the further pro rata distribution in kind by the general partner of BV XI-A SF and BV XI-B SF, for no additional consideration to its members, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

SEC source: 0001209191-21-065989 · doc4.xml · nonDerivative · entry 2

Chaffee Todd C · CIK 0001300134 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 58,401

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.95 to $72.38 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.

SEC source: 0001209191-21-065989 · doc4.xml · nonDerivative · entry 1

Chaffee Todd C · CIK 0001300134 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,868

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.95 to $71.26 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 · balance_after: The shares held directly by the Reporting Person prior to the transactions reported herein include the receipt of shares pursuant to pro rata distributions in kind, effected by Institutional Venture Partners XV, L.P. ("IVP XV LP") to its general partner and limited partners for no additional consideration, and the further pro rata distribution in kind by the general partner of IVP XV LP, for no additional consideration to its members, including the Reporting Person. The receipt of such shares by the Reporting Person constituted a change in form of ownership from indirect to direct, which was exempt from reporting pursuant to Rule 16a-13.

SEC source: 0001104659-21-141410 · tm2133398d3_4seq1.xml · nonDerivative · entry 2

Cohler Matt · CIK 0001572685 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 238,753

F3 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $72.28 to a high of $72.53, 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.

F2 · ownership.nature: Shares are held by Matthew Cohler's trust entity.

SEC source: 0001104659-21-141410 · tm2133398d3_4seq1.xml · nonDerivative · entry 1

Cohler Matt · CIK 0001572685 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 240,753

F1 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $71.2 to a high of $71.99, 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.

F2 · ownership.nature: Shares are held by Matthew Cohler's trust entity.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 10

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 500

F11 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $71.23 to a high of $72.08, 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.

F7 · ownership.nature: Shares are held by J. William Gurley's trust entity.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 9

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 8,119

F10 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $70.23 to a high of $71.22, 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.

F7 · ownership.nature: Shares are held by J. William Gurley's trust entity.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 8

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 62,292

F9 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $69.23 to a high of $70.225, 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.

F7 · ownership.nature: Shares are held by J. William Gurley's trust entity.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 7

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 135,920

F8 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $68.23 to a high of $69.18, 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.

F7 · ownership.nature: Shares are held by J. William Gurley's trust entity.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 6

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 140,720

F6 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $67.07 to a high of $68.05, 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.

F7 · ownership.nature: Shares are held by J. William Gurley's trust entity.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 5

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F2 · ownership.nature: Shares are held by J. William Gurley's family partnerships.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 4

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 2

F5 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $71.21 to a high of $72.08, 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.

F2 · ownership.nature: Shares are held by J. William Gurley's family partnerships.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 3

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 3,204

F4 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $70.05 to a high of $71, 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.

F2 · ownership.nature: Shares are held by J. William Gurley's family partnerships.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 2

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 4,204

F3 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $68.39 to a high of $69.32, 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.

F2 · ownership.nature: Shares are held by J. William Gurley's family partnerships.

SEC source: 0001104659-21-141407 · tm2133398-2_4seq1.xml · nonDerivative · entry 1

GURLEY J WILLIAM · CIK 0001190191 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 9,562

F1 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 16, 2021. The actual sale prices ranged from a low of $67.07 to a high of $68.02, 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.

F2 · ownership.nature: Shares are held by J. William Gurley's family partnerships.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 13

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: 0

F15 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $73.075 to a high of $73.425, 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.

F9 · ownership.nature: Shares held by Chetan Puttagunta's trust entity.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 12

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: 1,609

F14 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $72.02 to a high of $72.965, 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.

F9 · ownership.nature: Shares held by Chetan Puttagunta's trust entity.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 11

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: 10,767

F13 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $71.02 to a high of $72.015, 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.

F9 · ownership.nature: Shares held by Chetan Puttagunta's trust entity.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 10

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: 24,778

F12 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $70.02 to a high of $70.98, 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.

F9 · ownership.nature: Shares held by Chetan Puttagunta's trust entity.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 9

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: 29,118

F11 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $68.98 to a high of $69.97, 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.

F9 · ownership.nature: Shares held by Chetan Puttagunta's trust entity.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 8

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: 30,781

F10 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $67.85 to a high of $68.8, 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.

F9 · ownership.nature: Shares held by Chetan Puttagunta's trust entity.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 6

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: 0

F7 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $72.8 to a high of $73.5, 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.

F8 · ownership.nature: Shares held by Chetan Puttagunta.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 5

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: 139

F6 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $71.8 to a high of $72.795, 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.

F8 · ownership.nature: Shares held by Chetan Puttagunta.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 4

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: 337

F5 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $70.775 to a high of $71.77 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.

F8 · ownership.nature: Shares held by Chetan Puttagunta.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · entry 3

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: 709

F4 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $69.77 to a high of $70.765, 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.

F8 · ownership.nature: Shares held by Chetan Puttagunta.

SEC source: 0001104659-21-140216 · tm2133136d6_4.xml · nonDerivative · 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: 1,053

F3 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $68.65 to a high of $69.64, 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.

F8 · ownership.nature: Shares held by Chetan Puttagunta.

SEC source: 0001104659-21-140216 · tm2133136d6_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: 1,197

F2 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $67.57 to a high of $67.85, 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.

F8 · ownership.nature: Shares held by Chetan Puttagunta.

SEC source: 0001104659-21-140215 · tm2133136d5_4.xml · nonDerivative · entry 28

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: 139,127

F10 · price: Represents the weighted-average sale price per share of a series of transactions, all of which were executed on November 15, 2021. The actual sale prices ranged from a low of $72.8 to a high of $73.5, 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.

F17 · ownership.nature: Shares are held by Sarah Tavel.