X0306 4 2022-02-18 0001866692 Amplitude, Inc. AMPL 0001607841 SC US (TTGP), LTD. C/O SEQUOIA CAPITAL 2800 SAND HILL ROAD, SUITE 101 MENLO PARK CA 94025 0 0 1 0 0001611355 SC U.S. VENTURE 2010 MANAGEMENT, L.P. C/O SEQUOIA CAPITAL 2800 SAND HILL ROAD, SUITE 101 MENLO PARK CA 94025 0 0 1 0 0001563112 SEQUOIA CAPITAL U.S. VENTURE 2010-SEED FUND, L.P. C/O SEQUOIA CAPITAL 2800 SAND HILL ROAD, SUITE 101 MENLO PARK CA 94025 0 0 1 0 0001836414 SC U.S. Growth IX Management, L.P. 2800 SAND HILL ROAD, SUITE 101 MENLO PARK CA 94025 0 0 1 0 0001814893 Sequoia Capital U.S. Growth Fund IX, L.P. 2800 SAND HILL ROAD, SUITE 101 MENLO PARK CA 94025 0 0 1 0 0001814914 Sequoia Capital U.S. Growth Partners Fund IX, L.P. 2800 SAND HILL ROAD, SUITE 101 MENLO PARK CA 94025 0 0 1 0 0001814912 Sequoia Capital U.S. Growth IX Principals Fund, L.P. 2800 SAND HILL ROAD, SUITE 101 MENLO PARK CA 94025 0 0 1 0 Class A Common Stock 2022-02-18 4 P 0 146436 17.4936 A 146436 I Sequoia Capital U.S. Growth Fund IX, L.P. Class A Common Stock 2022-02-18 4 P 0 336696 18.4952 A 483133 I Sequoia Capital U.S. Growth Fund IX, L.P. Class A Common Stock 2022-02-18 4 P 0 706285 19.2110 A 1189418 I Sequoia Capital U.S. Growth Fund IX, L.P. Class A Common Stock 2022-02-18 4 P 0 394499 20.1427 A 1583917 I Sequoia Capital U.S. Growth Fund IX, L.P. Class A Common Stock 2022-02-18 4 P 0 6310 17.4936 A 6310 I Sequoia Capital U.S. Growth Partners Fund IX, L.P. Class A Common Stock 2022-02-18 4 P 0 14509 18.4952 A 20819 I Sequoia Capital U.S. Growth Partners Fund IX, L.P. Class A Common Stock 2022-02-18 4 P 0 30436 19.2110 A 51255 I Sequoia Capital U.S. Growth Partners Fund IX, L.P. Class A Common Stock 2022-02-18 4 P 0 17000 20.1427 A 68255 I Sequoia Capital U.S. Growth Partners Fund IX, L.P. Class A Common Stock 2022-02-18 4 P 0 15978 17.4936 A 15978 I Sequoia Capital U.S. Growth IX Principals Fund, L.P. Class A Common Stock 2022-02-18 4 P 0 36738 18.4952 A 52717 I Sequoia Capital U.S. Growth IX Principals Fund, L.P. Class A Common Stock 2022-02-18 4 P 0 77066 19.2110 A 129782 I Sequoia Capital U.S. Growth IX Principals Fund, L.P. Class A Common Stock 2022-02-18 4 P 0 43046 20.1427 A 172828 I Sequoia Capital U.S. Growth IX Principals Fund, L.P. Class A Common Stock 2022-02-22 4 P 0 272258 20.0108 A 1856175 I Sequoia Capital U.S. Growth Fund IX, L.P. Class A Common Stock 2022-02-22 4 P 0 207284 20.6755 A 2063459 I Sequoia Capital U.S. Growth Fund IX, L.P. Class A Common Stock 2022-02-22 4 P 0 11732 20.0108 A 79987 I Sequoia Capital U.S. Growth Partners Fund IX, L.P. Class A Common Stock 2022-02-22 4 P 0 8933 20.6755 A 88920 I Sequoia Capital U.S. Growth Partners Fund IX, L.P. Class A Common Stock 2022-02-22 4 P 0 29707 20.0108 A 202535 I Sequoia Capital U.S. Growth IX Principals Fund, L.P. Class A Common Stock 2022-02-22 4 P 0 22618 20.6755 A 225153 I Sequoia Capital U.S. Growth IX Principals Fund, L.P. Class A Common Stock 2022-02-23 4 P 0 158102 20.5018 A 2221562 I Sequoia Capital U.S. Growth Fund IX, L.P. Class A Common Stock 2022-02-23 4 P 0 3515 21.0906 A 2225077 I Sequoia Capital U.S. Growth Fund IX, L.P. Class A Common Stock 2022-02-23 4 P 0 6814 20.5018 A 95734 I Sequoia Capital U.S. Growth Partners Fund IX, L.P. Class A Common Stock 2022-02-23 4 P 0 151 21.0906 A 95885 I Sequoia Capital U.S. Growth Partners Fund IX, L.P. Class A Common Stock 2022-02-23 4 P 0 17251 20.5018 A 242404 I Sequoia Capital U.S. Growth IX Principals Fund, L.P. Class A Common Stock 2022-02-23 4 P 0 384 21.0906 A 242788 I Sequoia Capital U.S. Growth IX Principals Fund, L.P. Class A Common Stock 235201 I Sequoia Capital U.S. Venture 2010 - Seed Fund, L.P SC US (TTGP), Ltd. is (i) 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. (USV 2010-Seed), and (ii) the general partner of SC U.S. Growth IX Management, L.P., which is the general partner of Sequoia Capital U.S. Growth Fund IX, L.P., Sequoia Capital U.S. Growth Partners Fund IX, L.P., and Sequoia Capital U.S. Growth IX Principals Fund, L.P. (collectively "the GFIX Funds"). Each of SC US (TTGP), Ltd., SC U.S. Venture 2010 Management, L.P., and SC U.S. Growth IX Management, L.P. disclaims beneficial ownership of the shares held by USV 2010-Seed, and the GFIX Funds except to the extent of their 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. The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $16.7900 to $17.7899. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above. The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $17.7900 to $18.7899. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above. The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $18.7900 to $19.7899. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above. The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $19.7900 to $20.6900. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above. The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $19.3200 to $20.3199. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above. The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $20.3200 to $21.3100. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above. The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $20.0500 to $21.0499. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above. The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $21.0500 to $21.1200. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff at the Securities and Exchange Commission, upon request, the full information regarding the number of shares purchased at each separate price within the ranges set forth above. By: /s/ Jung Yeon Son, by power of attorney for Douglas Leone, a Director of SC US (TTGP), Ltd. 2022-02-23 By: /s/ Jung Yeon Son, by power of attorney for Douglas Leone, a Director of SC US (TTGP), Ltd., the General Partner of SC U.S. Venture 2010 Management, L.P. 2022-02-23 By: /s/ Jung Yeon Son, by power of attorney for Douglas Leone, a Director of SC US (TTGP), Ltd., the General Partner of SC U.S. Venture 2010 Management, L.P., the General Partner of Sequoia Capital U.S. Venture 2010-Seed Fund, L.P. 2022-02-23 By: /s/ Jung Yeon Son, by power of attorney for Douglas Leone, a Director of SC US (TTGP), Ltd., the General Partner of SC U.S. Growth IX Management, L.P. 2022-02-23 By: /s/ Jung Yeon Son, by power of attorney for Douglas Leone, a Director of SC US (TTGP), Ltd., the General Partner of SC U.S. Growth IX Management, L.P., which is the general partner of Sequoia Capital U.S. Growth Fund IX, L.P. 2022-02-23 By: /s/ Jung Yeon Son, by power of attorney for Douglas Leone, a Director of SC US (TTGP), Ltd., the General Partner of SC U.S. Growth IX Management, L.P., which is the general partner of Sequoia Capital U.S. Growth Partners Fund IX, L.P. 2022-02-23 By: /s/ Jung Yeon Son, by power of attorney for Douglas Leone, a Director of SC US (TTGP), Ltd., the General Partner of SC U.S. Growth IX Management, L.P., which is the general partner of Sequoia Capital U.S. Growth IX Principals Fund, L.P. 2022-02-23