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The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 33,445 RSUs."}],"balance_after":83891,"source":{"system":"sec-edgar","filing":"0001562180-23-001590","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000156218023001590/primarydocument.xml","form_type":"4"}},{"id":2053879,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Class A Common Stock","published_at":"2023-01-17T18:30:00.000Z","date":"2023-01-15","kind":"grant","acquired":true,"shares":32298,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents Restricted Stock Units (\"RSUs\"). 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The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 1,481 shares acquired under the Issuer's employee stock purchase plan on November 14, 2022."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 6,480 RSUs."}],"balance_after":55597,"source":{"system":"sec-edgar","filing":"0001562180-22-007819","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000156218022007819/primarydocument.xml","form_type":"4"}},{"id":2167861,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2022-09-02T18:05:54.000Z","date":"2022-08-31","kind":"exercise","acquired":false,"shares":5116,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"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."}],"balance_after":47732,"derivative":{"exercise_price":4.19,"expiration_date":"2030-11-09","underlying":"Class A Common Stock","underlying_shares":5116},"source":{"system":"sec-edgar","filing":"0001562180-22-006455","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000156218022006455/primarydocument.xml","form_type":"4"}},{"id":2167860,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Class A Common Stock","published_at":"2022-09-02T18:05:54.000Z","date":"2022-08-31","kind":"exercise","acquired":true,"shares":5116,"price":4.19,"value":21436.04,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 7,776 restricted stock units."}],"balance_after":54611,"source":{"system":"sec-edgar","filing":"0001562180-22-006455","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000156218022006455/primarydocument.xml","form_type":"4"}},{"id":2176278,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Class A Common Stock","published_at":"2022-08-23T16:15:43.000Z","date":"2022-08-15","kind":"sale","acquired":false,"shares":478,"price":17.6142,"value":8419.5876,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Pursuant to a mandatory sell-to-cover provision under the Issuer's 2021 Incentive Award Plan, the shares were sold upon the vesting of restricted stock units (\"RSUs\") solely to cover applicable withholding taxes."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $17.37 to $17.67, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 7,776 RSUs."}],"balance_after":49495,"source":{"system":"sec-edgar","filing":"0001562180-22-006282","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000156218022006282/primarydocument.xml","form_type":"4"}},{"id":2236417,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Stock Options (Right to buy)","published_at":"2022-06-10T17:16:08.000Z","date":"2022-06-10","kind":"exercise","acquired":false,"shares":3750,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"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."}],"balance_after":52848,"derivative":{"exercise_price":4.19,"expiration_date":"2030-11-10","underlying":"Class A Common Stock","underlying_shares":3750},"source":{"system":"sec-edgar","filing":"0001562180-22-005048","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000156218022005048/primarydocument.xml","form_type":"4"}},{"id":2236416,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Class A Common Stock","published_at":"2022-06-10T17:16:08.000Z","date":"2022-06-10","kind":"exercise","acquired":true,"shares":3750,"price":4.19,"value":15712.5,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 9,072 restricted stock units."}],"balance_after":49973,"source":{"system":"sec-edgar","filing":"0001562180-22-005048","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000156218022005048/primarydocument.xml","form_type":"4"}},{"id":2264052,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Class A Common Stock","published_at":"2022-05-19T16:07:55.000Z","date":"2022-05-17","kind":"sale","acquired":false,"shares":232,"price":17.2903,"value":4011.3496,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Pursuant to a mandatory sell-to-cover provision under the Issuer's 2021 Incentive Award Plan, the shares were sold upon the vesting of restricted stock units (\"RSUs\") solely to cover applicable withholding taxes"},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades in prices ranging from $17.1400 to $17.7400, inclusive. 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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)."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"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)."}],"balance_after":27500,"derivative":{"underlying":"Class A Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0000899243-21-037672","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000089924321037672/doc4.xml","form_type":"4"}},{"id":2560108,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-09-24T19:39:22.000Z","date":"2021-05-17","kind":"exercise","acquired":false,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Transaction is being reported herein pursuant to Rule 16a-2(a)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The option is early exercisable.  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 on the fourth anniversary of the Vesting Commencement Date."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F4","text":"In connection with the reclassification of the Issuer's Common Stock on August 30, 2021, each share of Common Stock held by the Reporting Person was automatically reclassified as Class B Common Stock."}],"balance_after":57036,"derivative":{"exercise_price":4.19,"expiration_date":"2030-11-10","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0000899243-21-037672","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000089924321037672/doc4.xml","form_type":"4"}},{"id":2560107,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Class B Common Stock","published_at":"2021-09-24T19:39:22.000Z","date":"2021-03-30","kind":"exercise","acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F4","text":"In connection with the reclassification of the Issuer's Common Stock on August 30, 2021, each share of Common Stock held by the Reporting Person was automatically reclassified as Class B Common Stock."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"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. 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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)."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"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)."}],"balance_after":17500,"derivative":{"underlying":"Class A Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0000899243-21-037672","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000089924321037672/doc4.xml","form_type":"4"}},{"id":2560106,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2021-09-24T19:39:22.000Z","date":"2021-03-30","kind":"exercise","acquired":false,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Transaction is being reported herein pursuant to Rule 16a-2(a)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The option is early exercisable.  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 on the fourth anniversary of the Vesting Commencement Date."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F4","text":"In connection with the reclassification of the Issuer's Common Stock on August 30, 2021, each share of Common Stock held by the Reporting Person was automatically reclassified as Class B Common Stock."}],"balance_after":67036,"derivative":{"exercise_price":4.19,"expiration_date":"2030-11-10","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0000899243-21-037672","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1883039/000089924321037672/doc4.xml","form_type":"4"}},{"id":2560105,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":116680,"kind":"person","name":"Sarkis Ninos","position":1,"cik":"0001883039","reported_name":"Sarkis Ninos","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Class B Common Stock","published_at":"2021-09-24T19:39:22.000Z","date":"2021-09-22","kind":"exercise","acquired":false,"shares":27500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"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. 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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)."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"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. 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