Sec Form 4 Filing - SC US (TTGP), LTD. @ Amplitude, Inc. - 2022-02-18

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person SC US (TTGP), LTD. 2. Issuer Name and Ticker or Trading Symbol Amplitude, Inc. [ AMPL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O SEQUOIA CAPITAL, 2800 SAND HILL ROAD, SUITE 101 3. Date of Earliest Transaction (MM/DD/YY) 02/18/2022 (Street) MENLO PARK, CA94025 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 02/18/2022 P 146,436 A $ 17.4936( 2 ) 146,436 I Sequoia Capital U.S. Growth Fund IX, L.P.( 1 ) Class A Common Stock 02/18/2022 P 336,696 A $ 18.4952( 3 ) 483,133 I Sequoia Capital U.S. Growth Fund IX, L.P.( 1 ) Class A Common Stock 02/18/2022 P 706,285 A $ 19.211( 4 ) 1,189,418 I Sequoia Capital U.S. Growth Fund IX, L.P.( 1 ) Class A Common Stock 02/18/2022 P 394,499 A $ 20.1427( 5 ) 1,583,917 I Sequoia Capital U.S. Growth Fund IX, L.P.( 1 ) Class A Common Stock 02/18/2022 P 6,310 A $ 17.4936( 2 ) 6,310 I Sequoia Capital U.S. Growth Partners Fund IX, L.P.( 1 ) Class A Common Stock 02/18/2022 P 14,509 A $ 18.4952( 3 ) 20,819 I Sequoia Capital U.S. Growth Partners Fund IX, L.P.( 1 ) Class A Common Stock 02/18/2022 P 30,436 A $ 19.211( 4 ) 51,255 I Sequoia Capital U.S. Growth Partners Fund IX, L.P.( 1 ) Class A Common Stock 02/18/2022 P 17,000 A $ 20.1427( 5 ) 68,255 I Sequoia Capital U.S. Growth Partners Fund IX, L.P.( 1 ) Class A Common Stock 02/18/2022 P 15,978 A $ 17.4936( 2 ) 15,978 I Sequoia Capital U.S. Growth IX Principals Fund, L.P.( 1 ) Class A Common Stock 02/18/2022 P 36,738 A $ 18.4952( 3 ) 52,717 I Sequoia Capital U.S. Growth IX Principals Fund, L.P.( 1 ) Class A Common Stock 02/18/2022 P 77,066 A $ 19.211( 4 ) 129,782 I Sequoia Capital U.S. Growth IX Principals Fund, L.P.( 1 ) Class A Common Stock 02/18/2022 P 43,046 A $ 20.1427( 5 ) 172,828 I Sequoia Capital U.S. Growth IX Principals Fund, L.P.( 1 ) Class A Common Stock 02/22/2022 P 272,258 A $ 20.0108( 6 ) 1,856,175 I Sequoia Capital U.S. Growth Fund IX, L.P.( 1 ) Class A Common Stock 02/22/2022 P 207,284 A $ 20.6755( 7 ) 2,063,459 I Sequoia Capital U.S. Growth Fund IX, L.P.( 1 ) Class A Common Stock 02/22/2022 P 11,732 A $ 20.0108( 6 ) 79,987 I Sequoia Capital U.S. Growth Partners Fund IX, L.P.( 1 ) Class A Common Stock 02/22/2022 P 8,933 A $ 20.6755( 7 ) 88,920 I Sequoia Capital U.S. Growth Partners Fund IX, L.P.( 1 ) Class A Common Stock 02/22/2022 P 29,707 A $ 20.0108( 6 ) 202,535 I Sequoia Capital U.S. Growth IX Principals Fund, L.P.( 1 ) Class A Common Stock 02/22/2022 P 22,618 A $ 20.6755( 7 ) 225,153 I Sequoia Capital U.S. Growth IX Principals Fund, L.P.( 1 ) Class A Common Stock 02/23/2022 P 158,102 A $ 20.5018( 8 ) 2,221,562 I Sequoia Capital U.S. Growth Fund IX, L.P.( 1 ) Class A Common Stock 02/23/2022 P 3,515 A $ 21.0906( 9 ) 2,225,077 I Sequoia Capital U.S. Growth Fund IX, L.P.( 1 ) Class A Common Stock 02/23/2022 P 6,814 A $ 20.5018( 8 ) 95,734 I Sequoia Capital U.S. Growth Partners Fund IX, L.P.( 1 ) Class A Common Stock 02/23/2022 P 151 A $ 21.0906( 9 ) 95,885 I Sequoia Capital U.S. Growth Partners Fund IX, L.P.( 1 ) Class A Common Stock 02/23/2022 P 17,251 A $ 20.5018( 8 ) 242,404 I Sequoia Capital U.S. Growth IX Principals Fund, L.P.( 1 ) Class A Common Stock 02/23/2022 P 384 A $ 21.0906( 9 ) 242,788 I Sequoia Capital U.S. Growth IX Principals Fund, L.P.( 1 ) Class A Common Stock 235,201 I Sequoia Capital U.S. Venture 2010 - Seed Fund, L.P( 2 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other SC US (TTGP), LTD. C/O SEQUOIA CAPITAL 2800 SAND HILL ROAD, SUITE 101 MENLO PARK, CA94025 X SC U.S. VENTURE 2010 MANAGEMENT, L.P. C/O SEQUOIA CAPITAL 2800 SAND HILL ROAD, SUITE 101 MENLO PARK, CA94025 X SEQUOIA CAPITAL U.S. VENTURE 2010-SEED FUND, L.P. C/O SEQUOIA CAPITAL 2800 SAND HILL ROAD, SUITE 101 MENLO PARK, CA94025 X SC U.S. Growth IX Management, L.P. 2800 SAND HILL ROAD, SUITE 101 MENLO PARK, CA94025 X Sequoia Capital U.S. Growth Fund IX, L.P. 2800 SAND HILL ROAD, SUITE 101 MENLO PARK, CA94025 X Sequoia Capital U.S. Growth Partners Fund IX, L.P. 2800 SAND HILL ROAD, SUITE 101 MENLO PARK, CA94025 X Sequoia Capital U.S. Growth IX Principals Fund, L.P. 2800 SAND HILL ROAD, SUITE 101 MENLO PARK, CA94025 X Signatures By: /s/ Jung Yeon Son, by power of attorney for Douglas Leone, a Director of SC US (TTGP), Ltd. 02/23/2022 Signature of Reporting Person Date 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. 02/23/2022 Signature of Reporting Person Date 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. 02/23/2022 Signature of Reporting Person Date 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. 02/23/2022 Signature of Reporting Person Date 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. 02/23/2022 Signature of Reporting Person Date 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. 02/23/2022 Signature of Reporting Person Date 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. 02/23/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )SC US (TTGP), Ltd. is (i) the general p artner 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. ( 2 )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. ( 3 )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. ( 4 )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. ( 5 )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. ( 6 )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. ( 7 )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. ( 8 )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. ( 9 )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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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