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Issuance of the RSU shares has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 29,086 RSUs."}],"balance_after":143992,"source":{"system":"sec-edgar","filing":"0001610717-26-000433","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000161071726000433/form4.xml","form_type":"4"}},{"id":4637111,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31726,"kind":"person","name":"Tzuo Tien","position":1,"cik":"0001735409","reported_name":"Tzuo Tien","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-10-07T20:27:41.000Z","date":"2026-10-05","kind":"grant","planned":false,"acquired":true,"shares":818,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the\"Program\") in lieu of retainer fees. Each RSU represents a right to receive one share of Class A Common Stock. Issuance of the RSU shares has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 51,607 RSUs."}],"balance_after":102419,"source":{"system":"sec-edgar","filing":"0001610717-26-000432","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000161071726000432/form4.xml","form_type":"4"}},{"id":4636068,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class B Common Stock","published_at":"2026-10-06T20:17:18.000Z","date":"2026-10-02","kind":"exercise","planned":true,"acquired":false,"shares":70087,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"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. 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":307157,"derivative":{"underlying":"Class A Common Stock","underlying_shares":70087},"source":{"system":"sec-edgar","filing":"0001610717-26-000427","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071726000427/form4.xml","form_type":"4"}},{"id":4636067,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-10-06T20:17:18.000Z","date":"2026-10-02","kind":"sale","planned":true,"acquired":false,"shares":70087,"price":14.5203,"value":1017684.2661,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on June 11, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $14.4500 to $14.6700. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001610717-26-000427","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071726000427/form4.xml","form_type":"4"}},{"id":4636066,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-10-06T20:17:18.000Z","date":"2026-10-02","kind":"exercise","planned":true,"acquired":true,"shares":70087,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"price","element":"transactionPricePerShare","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":70087,"source":{"system":"sec-edgar","filing":"0001610717-26-000427","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071726000427/form4.xml","form_type":"4"}},{"id":4628761,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class B Common Stock","published_at":"2026-10-02T22:44:05.000Z","date":"2026-10-01","kind":"exercise","planned":true,"acquired":false,"shares":3539,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"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. 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":377244,"derivative":{"underlying":"Class A Common Stock","underlying_shares":3539},"source":{"system":"sec-edgar","filing":"0001610717-26-000424","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071726000424/form4.xml","form_type":"4"}},{"id":4628760,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class B Common Stock","published_at":"2026-10-02T22:44:05.000Z","date":"2026-09-30","kind":"exercise","planned":true,"acquired":false,"shares":1374,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"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. 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":380783,"derivative":{"underlying":"Class A Common Stock","underlying_shares":1374},"source":{"system":"sec-edgar","filing":"0001610717-26-000424","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071726000424/form4.xml","form_type":"4"}},{"id":4628759,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-10-02T22:44:05.000Z","date":"2026-10-01","kind":"sale","planned":true,"acquired":false,"shares":3539,"price":14.45,"value":51138.55,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on June 11, 2026."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001610717-26-000424","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071726000424/form4.xml","form_type":"4"}},{"id":4628758,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-10-02T22:44:05.000Z","date":"2026-10-01","kind":"exercise","planned":true,"acquired":true,"shares":3539,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"price","element":"transactionPricePerShare","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":3539,"source":{"system":"sec-edgar","filing":"0001610717-26-000424","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071726000424/form4.xml","form_type":"4"}},{"id":4628757,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-10-02T22:44:05.000Z","date":"2026-09-30","kind":"sale","planned":true,"acquired":false,"shares":1374,"price":14.453,"value":19858.422,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on June 11, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $14.4500 to $14.4700. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001610717-26-000424","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071726000424/form4.xml","form_type":"4"}},{"id":4628756,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-10-02T22:44:05.000Z","date":"2026-09-30","kind":"exercise","planned":true,"acquired":true,"shares":1374,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"price","element":"transactionPricePerShare","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":1374,"source":{"system":"sec-edgar","filing":"0001610717-26-000424","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071726000424/form4.xml","form_type":"4"}},{"id":4617126,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"CEO and President"}}],"security":"Class B Common Stock","published_at":"2026-09-14T20:59:44.000Z","date":"2026-09-10","kind":"exercise","planned":true,"acquired":false,"shares":185000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"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. 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":382157,"derivative":{"underlying":"Class A Common Stock","underlying_shares":185000},"source":{"system":"sec-edgar","filing":"0001866692-26-000018","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000186669226000018/form4.xml","form_type":"4"}},{"id":4617125,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-09-14T20:59:44.000Z","date":"2026-09-10","kind":"sale","planned":true,"acquired":false,"shares":185000,"price":12.3006,"value":2275611.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on June 11, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $12.0300 to $12.5100. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001866692-26-000018","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000186669226000018/form4.xml","form_type":"4"}},{"id":4617124,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-09-14T20:59:44.000Z","date":"2026-09-10","kind":"exercise","planned":true,"acquired":true,"shares":185000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"price","element":"transactionPricePerShare","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":185000,"source":{"system":"sec-edgar","filing":"0001866692-26-000018","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000186669226000018/form4.xml","form_type":"4"}},{"id":4613543,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22299,"kind":"person","name":"Crook Nathaniel Glenn","position":1,"cik":"0002121274","reported_name":"Crook Nathaniel Glenn","relationship":{"officer":true,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-09T21:03:52.000Z","date":"2026-09-04","kind":"sale","planned":true,"acquired":false,"shares":300000,"price":12.9925,"value":3897750.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on June 2, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $12.6150 to $13.5100. 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 1,241,362 restricted stock units."}],"balance_after":1622696,"source":{"system":"sec-edgar","filing":"0001866692-26-000015","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2121274/000186669226000015/form4.xml","form_type":"4"}},{"id":683753,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu Curtis","position":1,"cik":"0001883022","reported_name":"Liu Curtis","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-08-18T21:19:27.000Z","date":"2026-08-17","kind":"tax_withholding","planned":false,"acquired":false,"shares":53878,"price":13.03,"value":702030.34,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on August 15, 2026, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the Reporting Person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 774,628 RSUs."}],"balance_after":950316,"source":{"system":"sec-edgar","filing":"0001866692-26-000013","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000186669226000013/form4.xml","form_type":"4"}},{"id":684508,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-08-18T21:18:20.000Z","date":"2026-08-17","kind":"tax_withholding","planned":false,"acquired":false,"shares":52369,"price":13.03,"value":682368.07,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on August 15, 2026, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the Reporting Person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,102,599 RSUs."}],"balance_after":1231188,"source":{"system":"sec-edgar","filing":"0001866692-26-000012","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000186669226000012/form4.xml","form_type":"4"}},{"id":683725,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22299,"kind":"person","name":"Crook Nathaniel Glenn","position":1,"cik":"0002121274","reported_name":"Crook Nathaniel Glenn","relationship":{"officer":true,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-08-18T21:16:57.000Z","date":"2026-08-17","kind":"tax_withholding","planned":false,"acquired":false,"shares":109368,"price":13.03,"value":1425065.04,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on August 15, 2026, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the Reporting Person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,241,362 RSUs."}],"balance_after":1922696,"source":{"system":"sec-edgar","filing":"0001866692-26-000011","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000186669226000011/form4.xml","form_type":"4"}},{"id":683947,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22367,"kind":"person","name":"Casey Andrew","position":1,"cik":"0002032390","reported_name":"Casey Andrew","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2026-08-18T21:14:54.000Z","date":"2026-08-17","kind":"tax_withholding","planned":false,"acquired":false,"shares":72814,"price":13.03,"value":948766.42,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on August 15, 2026, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the Reporting Person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 814,949 RSUs."}],"balance_after":1363338,"source":{"system":"sec-edgar","filing":"0001866692-26-000010","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000186669226000010/form4.xml","form_type":"4"}},{"id":711254,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu Curtis","position":1,"cik":"0001883022","reported_name":"Liu Curtis","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class B Common Stock","published_at":"2026-07-10T20:13:00.000Z","date":"2026-07-08","kind":"gift","planned":false,"acquired":true,"shares":175000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"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. 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, (b) the death or incapacity of the reporting person, (c) the date that is six months following the date on which the reporting person is no longer an employee or director of the Issuer (unless such reporting person has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","label":"F2","text":"This transaction involved a gift of securities by the trust to the reporting person's spouse. This is not a market transaction, thus no price has been reported. No value was received for the gifted shares."},{"field":"derivative.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of the reporting person, (c) the date that is six months following the date on which the reporting person is no longer an employee or director of the Issuer (unless such reporting person has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of the reporting person, (c) the date that is six months following the date on which the reporting person is no longer an employee or director of the Issuer (unless such reporting person has rejoined the Issuer during such six-month period) or (d) 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":175000,"derivative":{"underlying":"Class A Common Stock","underlying_shares":175000},"source":{"system":"sec-edgar","filing":"0001883022-26-000016","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000188302226000016/primarydocument.xml","form_type":"4"}},{"id":711253,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu Curtis","position":1,"cik":"0001883022","reported_name":"Liu Curtis","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class B Common Stock","published_at":"2026-07-10T20:13:00.000Z","date":"2026-07-08","kind":"gift","planned":false,"acquired":false,"shares":175000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Trust"},"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. 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, (b) the death or incapacity of the reporting person, (c) the date that is six months following the date on which the reporting person is no longer an employee or director of the Issuer (unless such reporting person has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","label":"F2","text":"This transaction involved a gift of securities by the trust to the reporting person's spouse. This is not a market transaction, thus no price has been reported. No value was received for the gifted shares."},{"field":"derivative.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of the reporting person, (c) the date that is six months following the date on which the reporting person is no longer an employee or director of the Issuer (unless such reporting person has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of the reporting person, (c) the date that is six months following the date on which the reporting person is no longer an employee or director of the Issuer (unless such reporting person has rejoined the Issuer during such six-month period) or (d) 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":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Securities held by a trust over which the reporting person exercises voting and dispositive control."}],"balance_after":7207208,"derivative":{"underlying":"Class A Common Stock","underlying_shares":175000},"source":{"system":"sec-edgar","filing":"0001883022-26-000016","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000188302226000016/primarydocument.xml","form_type":"4"}},{"id":713709,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31726,"kind":"person","name":"Tzuo Tien","position":1,"cik":"0001735409","reported_name":"Tzuo Tien","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-07-07T22:19:41.000Z","date":"2026-07-05","kind":"grant","planned":false,"acquired":true,"shares":1521,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the\"Program\") in lieu of retainer fees. Each RSU represents a right to receive one share of Class A Common Stock. Issuance of the RSU shares has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 50,789 RSUs."}],"balance_after":101601,"source":{"system":"sec-edgar","filing":"0001735409-26-000007","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000173540926000007/primarydocument.xml","form_type":"4"}},{"id":713708,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-07-07T22:18:37.000Z","date":"2026-07-05","kind":"grant","planned":false,"acquired":true,"shares":1659,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the\"Program\") in lieu of retainer fees. Each RSU represents a right to receive one share of Class A Common Stock. Issuance of the RSU shares has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 28,194 RSUs."}],"balance_after":143100,"source":{"system":"sec-edgar","filing":"0001542687-26-000006","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268726000006/primarydocument.xml","form_type":"4"}},{"id":736406,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu Curtis","position":1,"cik":"0001883022","reported_name":"Liu Curtis","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-06-16T21:15:11.000Z","date":"2026-06-01","kind":"sale","planned":true,"acquired":false,"shares":22786,"price":8.0259,"value":182878.1574,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on November 26, 2025."},{"field":"shares","element":"transactionShares","label":"F2","text":"This Form 4/A is being filed solely to correct the number of shares reported as sold on June 1, 2026 and the total number of shares owned following the transaction. Due to a broker administrative error, 585 fewer shares were sold than were required pursuant to the Reporting Person's Rule 10b5-1 trading plan. The error was corrected through the broker's error account, with the broker crediting the Reporting Person for the additional 585 shares at the applicable June 1, 2026 sale price and absorbing the cost of the correction. No additional open-market sale was effected in connection with the correction."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $8.0000 to $8.0600. 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":"F4","text":"Includes 880,520 restricted stock units."}],"balance_after":1004194,"source":{"system":"sec-edgar","filing":"0001610717-26-000228","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000161071726000228/form4.xml","form_type":"4/A","original_submission_date":"2026-06-03"}},{"id":737965,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":38220,"kind":"person","name":"Wong Catherine","position":1,"cik":"0001744910","reported_name":"Wong Catherine","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-15T20:26:36.000Z","date":"2026-06-12","kind":"sale","planned":true,"acquired":false,"shares":7453,"price":6.7865,"value":50579.7845,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares sold to satisfy tax obligations in connection with the vesting of restricted stock units (\"RSUs\"), pursuant to a 10b5-1 trading plan adopted by the Reporting Person on December 11, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $6.5800 to $6.9400, 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 24,857 RSUs."}],"balance_after":111462,"source":{"system":"sec-edgar","filing":"0001744910-26-000004","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000174491026000004/primarydocument.xml","form_type":"4"}},{"id":741879,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":15619,"kind":"person","name":"Whitehurst James M","position":1,"cik":"0001292272","reported_name":"Whitehurst James M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-11T20:42:56.000Z","date":"2026-06-09","kind":"grant","planned":false,"acquired":true,"shares":24857,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the \"Program\"). Each RSU represents a right to receive one share of Class A Common Stock. The RSUs will vest in full on the earlier of (i) June 9, 2027 or (ii) immediately before the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 36,214 RSUs."}],"balance_after":187201,"source":{"system":"sec-edgar","filing":"0001292272-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000129227226000002/primarydocument.xml","form_type":"4"}},{"id":741878,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":38220,"kind":"person","name":"Wong Catherine","position":1,"cik":"0001744910","reported_name":"Wong Catherine","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-11T20:42:27.000Z","date":"2026-06-09","kind":"grant","planned":false,"acquired":true,"shares":24857,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the \"Program\"). Each RSU represents a right to receive one share of Class A Common Stock. The RSUs will vest in full on the earlier of (i) June 9, 2027 or (ii) immediately before the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 24,857 RSUs."}],"balance_after":118915,"source":{"system":"sec-edgar","filing":"0001744910-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000174491026000002/primarydocument.xml","form_type":"4"}},{"id":741876,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":39311,"kind":"person","name":"Gill Ronald S","position":1,"cik":"0001494474","reported_name":"Gill Ronald S","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-11T20:42:01.000Z","date":"2026-06-09","kind":"grant","planned":false,"acquired":true,"shares":24857,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the \"Program\"). 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The RSUs will vest in full on the earlier of (i) June 9, 2027 or (ii) immediately before the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (i) 13,729 shares of Class A Common Stock received in a pro rata in-kind distribution exempt from reporting pursuant to Rule 16a-9, and (ii) 58,657 RSUs."}],"balance_after":99535,"source":{"system":"sec-edgar","filing":"0001494474-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000149447426000002/primarydocument.xml","form_type":"4"}},{"id":741877,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-11T20:41:36.000Z","date":"2026-06-09","kind":"grant","planned":false,"acquired":true,"shares":24857,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the \"Program\"). Each RSU represents a right to receive one share of Class A Common Stock. Vesting of the RSUs has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 26,535 RSUs."}],"balance_after":141441,"source":{"system":"sec-edgar","filing":"0001542687-26-000004","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268726000004/primarydocument.xml","form_type":"4"}},{"id":741871,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":39310,"kind":"person","name":"Grady Patrick W","position":1,"cik":"0001700423","reported_name":"Grady Patrick W","relationship":{"director":true,"ten_percent_owner":true}}],"security":"Class A Common Stock","published_at":"2026-06-11T20:21:02.000Z","date":"2026-06-09","kind":"grant","planned":false,"acquired":true,"shares":24857,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program. Each RSU represents a right to receive one share of Class A Common Stock. The RSUs will vest in full on the earlier of (i) June 9, 2027 or (ii) immediately before the Issuer's 2027 annual meeting of stockholders, subject to the Reporting Person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 24,857 RSUs."}],"balance_after":85806,"source":{"system":"sec-edgar","filing":"0001610717-26-000214","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000161071726000214/form4.xml","form_type":"4"}},{"id":752144,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu Curtis","position":1,"cik":"0001883022","reported_name":"Liu Curtis","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-06-03T21:17:17.000Z","date":"2026-06-01","kind":"sale","planned":true,"acquired":false,"shares":22201,"price":8.0259,"value":178183.0059,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on November 26, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $8.0000 to $8.0600. 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 880,520 restricted stock units."}],"balance_after":1004779,"source":{"system":"sec-edgar","filing":"0001883022-26-000014","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000188302226000014/primarydocument.xml","form_type":"4"}},{"id":772381,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu Curtis","position":1,"cik":"0001883022","reported_name":"Liu 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shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on May 15, 2026, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the Reporting Person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 958,054 RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 2,500 shares acquired under the Issuer's employee stock purchase plan on May 14, 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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 986,412 restricted stock units."}],"balance_after":1067259,"source":{"system":"sec-edgar","filing":"0001883022-26-000010","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000188302226000010/primarydocument.xml","form_type":"4"}},{"id":803341,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"CEO and President"}}],"security":"Class A Common Stock","published_at":"2026-04-22T21:11:04.000Z","date":"2026-04-21","kind":"grant","planned":false,"acquired":true,"shares":1323119,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a right to receive one share of the Issuer's Class A Common Stock. 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The RSUs vest in twelve substantially equal quarterly installments beginning on May 15, 2026, subject to the continued service of the reporting person through each vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 986,412 RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"The Form 4s filed by the reporting person on March 9, 2026 and March 10, 2026 understated the reporting person's beneficial ownership by 63,262 shares. 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The RSUs vest in twelve substantially equal quarterly installments beginning on May 15, 2026, subject to the continued service of the reporting person through each vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 1,701,371 RSUs."}],"balance_after":2131026,"source":{"system":"sec-edgar","filing":"0002121274-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000212127426000002/primarydocument.xml","form_type":"4"}},{"id":805779,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22299,"kind":"person","name":"Crook Nathaniel Glenn","position":1,"cik":"0002121274","reported_name":"Crook Nathaniel Glenn","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Commercial Officer"}}],"security":"Class A Common Stock","published_at":"2026-04-17T21:54:46.000Z","date":"2026-04-15","kind":"grant","planned":false,"acquired":true,"shares":278551,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a right to receive one share of the Issuer's Class A Common Stock. 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The RSUs vest in twelve substantially equal quarterly installments beginning on May 15, 2026, subject to the continued service of the reporting person through each vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,101,159 RSUs."}],"balance_after":1498524,"source":{"system":"sec-edgar","filing":"0002032390-26-000004","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000203239026000004/primarydocument.xml","form_type":"4"}},{"id":813525,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-04-07T21:31:05.000Z","date":"2026-04-05","kind":"grant","planned":false,"acquired":true,"shares":1678,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the\"Program\") in lieu of retainer fees. Each RSU represents a right to receive one share of Class A Common Stock. Issuance of the RSU shares has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 16,584 RSUs."}],"balance_after":116584,"source":{"system":"sec-edgar","filing":"0001542687-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268726000002/primarydocument.xml","form_type":"4"}},{"id":813524,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31726,"kind":"person","name":"Tzuo Tien","position":1,"cik":"0001735409","reported_name":"Tzuo Tien","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-04-07T21:30:13.000Z","date":"2026-04-05","kind":"grant","planned":false,"acquired":true,"shares":1538,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the\"Program\") in lieu of retainer fees. Each RSU represents a right to receive one share of Class A Common Stock. Issuance of the RSU shares has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 49,268 RSUs."}],"balance_after":100080,"source":{"system":"sec-edgar","filing":"0001735409-26-000005","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000173540926000005/primarydocument.xml","form_type":"4"}},{"id":851305,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu Curtis","position":1,"cik":"0001883022","reported_name":"Liu Curtis","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-03-10T20:54:06.000Z","date":"2026-03-06","kind":"sale","planned":true,"acquired":false,"shares":33201,"price":8.007,"value":265840.407,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the reporting person on November 26, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $8.00 to $8.04. 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 568,585 restricted stock units."}],"balance_after":603756,"source":{"system":"sec-edgar","filing":"0001883022-26-000006","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000188302226000006/primarydocument.xml","form_type":"4"}},{"id":853748,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu Curtis","position":1,"cik":"0001883022","reported_name":"Liu Curtis","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2026-03-09T20:44:16.000Z","date":"2026-03-05","kind":"sale","planned":true,"acquired":false,"shares":30061,"price":8.0017,"value":240539.1037,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the reporting person on November 26, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $8.00 to $8.02, 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 568,585 restricted stock units."}],"balance_after":636957,"source":{"system":"sec-edgar","filing":"0001883022-26-000005","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000188302226000005/primarydocument.xml","form_type":"4"}},{"id":901259,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":66223,"kind":"person","name":"HANSEN THOMAS NEERGAARD","position":1,"cik":"0001728084","reported_name":"HANSEN THOMAS 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of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on February 15, 2026, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes  568,585 RSUs."}],"balance_after":730280,"source":{"system":"sec-edgar","filing":"0001883022-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000188302226000002/primarydocument.xml","form_type":"4"}},{"id":901458,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22367,"kind":"person","name":"Casey 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RSUs."}],"balance_after":1066770,"source":{"system":"sec-edgar","filing":"0002032390-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000203239026000002/primarydocument.xml","form_type":"4"}},{"id":944729,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31726,"kind":"person","name":"Tzuo Tien","position":1,"cik":"0001735409","reported_name":"Tzuo Tien","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-01-07T22:24:22.000Z","date":"2026-01-05","kind":"grant","planned":false,"acquired":true,"shares":999,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the\"Program\") in lieu of retainer fees. Each RSU represents a right to receive one share of Class A Common Stock. Issuance of the RSU shares has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 47,730 RSUs."}],"balance_after":98542,"source":{"system":"sec-edgar","filing":"0001735409-26-000003","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000173540926000003/primarydocument.xml","form_type":"4"}},{"id":957635,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class B Common Stock","published_at":"2025-12-30T23:04:23.000Z","date":"2025-12-26","kind":"exercise","planned":true,"acquired":false,"shares":100,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"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. 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":567157,"derivative":{"underlying":"Class A Common Stock","underlying_shares":100},"source":{"system":"sec-edgar","filing":"0001882913-25-000007","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291325000007/primarydocument.xml","form_type":"4"}},{"id":957634,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-12-30T23:04:23.000Z","date":"2025-12-26","kind":"sale","planned":true,"acquired":false,"shares":100,"price":12,"value":1200.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on August 8, 2025."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001882913-25-000007","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291325000007/primarydocument.xml","form_type":"4"}},{"id":957633,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-12-30T23:04:23.000Z","date":"2025-12-26","kind":"exercise","planned":true,"acquired":true,"shares":100,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"price","element":"transactionPricePerShare","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":100,"source":{"system":"sec-edgar","filing":"0001882913-25-000007","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291325000007/primarydocument.xml","form_type":"4"}},{"id":959019,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class B Common Stock","published_at":"2025-12-29T22:08:38.000Z","date":"2025-12-24","kind":"exercise","planned":true,"acquired":false,"shares":42743,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"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. 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":567257,"derivative":{"underlying":"Class A Common Stock","underlying_shares":42743},"source":{"system":"sec-edgar","filing":"0001882913-25-000005","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291325000005/primarydocument.xml","form_type":"4"}},{"id":959018,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-12-29T22:08:38.000Z","date":"2025-12-24","kind":"sale","planned":true,"acquired":false,"shares":42743,"price":12.0121,"value":513433.1903,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on August 8, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $12.0000 to $12.0400. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001882913-25-000005","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291325000005/primarydocument.xml","form_type":"4"}},{"id":959017,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-12-29T22:08:38.000Z","date":"2025-12-24","kind":"exercise","planned":true,"acquired":true,"shares":42743,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"price","element":"transactionPricePerShare","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":42743,"source":{"system":"sec-edgar","filing":"0001882913-25-000005","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291325000005/primarydocument.xml","form_type":"4"}},{"id":965309,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-12-17T22:29:04.000Z","date":"2025-12-15","kind":"exercise","planned":true,"acquired":false,"shares":10000,"price":4.19,"value":41900.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The option is early exercisable. 1/48th of the shares subject to the option vest on each monthly anniversary measured from December 10, 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."}],"balance_after":49500,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-15","underlying":"Class A Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001542687-25-000011","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000011/primarydocument.xml","form_type":"4"}},{"id":965308,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-12-17T22:29:04.000Z","date":"2025-12-15","kind":"sale","planned":true,"acquired":false,"shares":10000,"price":10.8758,"value":108758.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the reporting person on March 12, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $10.7200 to $11.1900. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 14,906 RSUs."}],"balance_after":114906,"source":{"system":"sec-edgar","filing":"0001542687-25-000011","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000011/primarydocument.xml","form_type":"4"}},{"id":965307,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-12-17T22:29:04.000Z","date":"2025-12-15","kind":"exercise","planned":true,"acquired":true,"shares":10000,"price":4.19,"value":41900.0,"ownership":{"direct":true},"balance_after":124906,"source":{"system":"sec-edgar","filing":"0001542687-25-000011","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000011/primarydocument.xml","form_type":"4"}},{"id":994069,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-11-19T22:02:09.000Z","date":"2025-11-17","kind":"exercise","planned":true,"acquired":false,"shares":10000,"price":4.19,"value":41900.0,"ownership":{"direct":true},"footnotes":[{"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 December 10, 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."}],"balance_after":59500,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-15","underlying":"Class A Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001542687-25-000009","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000009/primarydocument.xml","form_type":"4"}},{"id":994068,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-11-19T22:02:09.000Z","date":"2025-11-17","kind":"sale","planned":true,"acquired":false,"shares":10000,"price":10.2295,"value":102295.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the reporting person on March 12, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $9.5000 to $10.5800. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":107406,"source":{"system":"sec-edgar","filing":"0001542687-25-000009","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000009/primarydocument.xml","form_type":"4"}},{"id":994067,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common 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shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on November 15, 2025, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,140,440 RSUs."}],"balance_after":1106208,"source":{"system":"sec-edgar","filing":"0002032390-25-000006","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000203239025000006/primarydocument.xml","form_type":"4"}},{"id":995984,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":66223,"kind":"person","name":"HANSEN THOMAS 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RSUs."}],"balance_after":1914987,"source":{"system":"sec-edgar","filing":"0001728084-25-000003","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000172808425000003/primarydocument.xml","form_type":"4"}},{"id":1000973,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class B Common Stock","published_at":"2025-11-13T22:12:16.000Z","date":"2025-11-11","kind":"exercise","planned":true,"acquired":false,"shares":400000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"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. 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":610000,"derivative":{"underlying":"Class A Common Stock","underlying_shares":400000},"source":{"system":"sec-edgar","filing":"0001882913-25-000003","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291325000003/primarydocument.xml","form_type":"4"}},{"id":1000972,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-11-13T22:12:16.000Z","date":"2025-11-11","kind":"sale","planned":true,"acquired":false,"shares":400000,"price":10.9883,"value":4395320.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on August 8, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $10.5500 to $11.2700. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001882913-25-000003","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291325000003/primarydocument.xml","form_type":"4"}},{"id":1000971,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Class A Common Stock","published_at":"2025-11-13T22:12:16.000Z","date":"2025-11-11","kind":"exercise","planned":true,"acquired":true,"shares":400000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"footnotes":[{"field":"price","element":"transactionPricePerShare","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":400000,"source":{"system":"sec-edgar","filing":"0001882913-25-000003","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291325000003/primarydocument.xml","form_type":"4"}},{"id":1002234,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22367,"kind":"person","name":"Casey Andrew","position":1,"cik":"0002032390","reported_name":"Casey Andrew","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2025-11-12T22:16:12.000Z","date":"2025-11-07","kind":"purchase","planned":false,"acquired":true,"shares":30000,"price":9.993,"value":299790.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $9.90 to $10.07, inclusive. The price reported in Column 4 above reflects the weighted average 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 purchased at each respective price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 883,657 RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 2,500 shares acquired under the Issuer's employee stock purchase plan on May 14, 2025."}],"balance_after":1160608,"source":{"system":"sec-edgar","filing":"0002032390-25-000004","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000203239025000004/primarydocument.xml","form_type":"4"}},{"id":1016935,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-10-17T21:49:48.000Z","date":"2025-10-15","kind":"exercise","planned":true,"acquired":false,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"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 December 10, 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."}],"balance_after":69500,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-15","underlying":"Class A Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001542687-25-000007","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000007/primarydocument.xml","form_type":"4"}},{"id":1016934,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-10-17T21:49:48.000Z","date":"2025-10-15","kind":"sale","planned":true,"acquired":false,"shares":10000,"price":10.1229,"value":101229.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the reporting person on March 12, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $10.0200 to $10.2900. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":107406,"source":{"system":"sec-edgar","filing":"0001542687-25-000007","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000007/primarydocument.xml","form_type":"4"}},{"id":1016933,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-10-17T21:49:48.000Z","date":"2025-10-15","kind":"exercise","planned":true,"acquired":true,"shares":10000,"price":4.19,"value":41900.0,"ownership":{"direct":true},"balance_after":117406,"source":{"system":"sec-edgar","filing":"0001542687-25-000007","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000007/primarydocument.xml","form_type":"4"}},{"id":1022279,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31726,"kind":"person","name":"Tzuo Tien","position":1,"cik":"0001735409","reported_name":"Tzuo Tien","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-10-07T21:27:30.000Z","date":"2025-10-05","kind":"grant","planned":false,"acquired":true,"shares":977,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the\"Program\") in lieu of retainer fees. Each RSU represents a right to receive one share of Class A Common Stock. Issuance of the RSU shares has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 46,731 RSUs."}],"balance_after":97543,"source":{"system":"sec-edgar","filing":"0001735409-25-000005","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000173540925000005/primarydocument.xml","form_type":"4"}},{"id":1038028,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-09-17T21:31:20.000Z","date":"2025-09-15","kind":"exercise","planned":true,"acquired":false,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"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 December 10, 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."}],"balance_after":79500,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-15","underlying":"Class A Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001542687-25-000005","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000005/primarydocument.xml","form_type":"4"}},{"id":1038027,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-09-17T21:31:20.000Z","date":"2025-09-15","kind":"sale","planned":true,"acquired":false,"shares":10000,"price":11.0633,"value":110633.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the reporting person on March 12, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $10.8500 to $11.3100. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":107406,"source":{"system":"sec-edgar","filing":"0001542687-25-000005","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000154268725000005/primarydocument.xml","form_type":"4"}},{"id":1038026,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common 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shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on August 15, 2025, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 883,657 RSUs."}],"balance_after":1128108,"source":{"system":"sec-edgar","filing":"0001562180-25-005898","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000156218025005898/primarydocument.xml","form_type":"4"}},{"id":1062024,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu 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the shares subject to the option vest on each monthly anniversary measured from December 10, 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 VestingCommencement Date."}],"balance_after":89500,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-15","underlying":"Class A Common Stock","underlying_shares":7500},"source":{"system":"sec-edgar","filing":"0001562180-25-005896","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025005896/primarydocument.xml","form_type":"4"}},{"id":1062003,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz 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The price reported above reflects the weighted average sale price. The reporting person hereby\nundertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was\neffected."}],"balance_after":107406,"source":{"system":"sec-edgar","filing":"0001562180-25-005896","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025005896/primarydocument.xml","form_type":"4"}},{"id":1062002,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-08-19T21:44:11.000Z","date":"2025-08-15","kind":"exercise","planned":true,"acquired":true,"shares":7500,"price":4.19,"value":31425.0,"ownership":{"direct":true},"balance_after":114906,"source":{"system":"sec-edgar","filing":"0001562180-25-005896","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025005896/primarydocument.xml","form_type":"4"}},{"id":1073465,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Chief Executive Officer"}}],"security":"Class B Common Stock","published_at":"2025-08-06T21:57:36.000Z","date":"2025-08-04","kind":"gift","planned":false,"acquired":true,"shares":1010000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Spouse"},"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. 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","label":"F2","text":"This transaction involved a gift of securities by the reporting person to his wife. This is not a market transaction, thus no price has been reported. No value was received for the gifted shares."},{"field":"derivative.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":1010000,"derivative":{"underlying":"Class A Common Stock","underlying_shares":1010000},"source":{"system":"sec-edgar","filing":"0001610717-25-000291","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071725000291/form4.xml","form_type":"4"}},{"id":1073464,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22539,"kind":"person","name":"Skates Spenser","position":1,"cik":"0001882913","reported_name":"Skates Spenser","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Chief Executive Officer"}}],"security":"Class B Common Stock","published_at":"2025-08-06T21:57:36.000Z","date":"2025-08-04","kind":"gift","planned":false,"acquired":false,"shares":1010000,"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. 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":"kind","element":"transactionCoding","label":"F2","text":"This transaction involved a gift of securities by the reporting person to his wife. This is not a market transaction, thus no price has been reported. No value was received for the gifted shares."},{"field":"derivative.exercise_date","element":"exerciseDate","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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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, (b) the death or incapacity of Mr. Skates, (c) the date that is six months following the date on which Mr. Skates is no longer an employee or director of the Issuer (unless Mr. Skates has rejoined the Issuer during such six-month period) or (d) 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":5342146,"derivative":{"underlying":"Class A Common Stock","underlying_shares":1010000},"source":{"system":"sec-edgar","filing":"0001610717-25-000291","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000161071725000291/form4.xml","form_type":"4"}},{"id":1085646,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-07-17T21:47:32.000Z","date":"2025-07-15","kind":"exercise","planned":true,"acquired":false,"shares":7500,"price":4.19,"value":31425.0,"ownership":{"direct":true},"footnotes":[{"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 December 10, 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."}],"balance_after":97000,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-15","underlying":"Class A Common Stock","underlying_shares":7500},"source":{"system":"sec-edgar","filing":"0001562180-25-005458","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025005458/primarydocument.xml","form_type":"4"}},{"id":1085645,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2025-07-17T21:47:32.000Z","date":"2025-06-11","kind":"exercise","planned":true,"acquired":false,"shares":7500,"price":4.19,"value":31425.0,"ownership":{"direct":true},"footnotes":[{"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 December 10, 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."}],"balance_after":104500,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-15","underlying":"Class A Common Stock","underlying_shares":7500},"source":{"system":"sec-edgar","filing":"0001562180-25-005458","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025005458/primarydocument.xml","form_type":"4"}},{"id":1085644,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-07-17T21:47:32.000Z","date":"2025-07-15","kind":"sale","planned":true,"acquired":false,"shares":7500,"price":12.5607,"value":94205.25,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on March 12, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $12.41 to $12.81. The price reported above reflects the weighted average sale price. The reporting person hereby\nundertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was\neffected."}],"balance_after":107406,"source":{"system":"sec-edgar","filing":"0001562180-25-005458","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025005458/primarydocument.xml","form_type":"4"}},{"id":1085643,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-07-17T21:47:32.000Z","date":"2025-07-15","kind":"exercise","planned":true,"acquired":true,"shares":7500,"price":4.19,"value":31425.0,"ownership":{"direct":true},"balance_after":114906,"source":{"system":"sec-edgar","filing":"0001562180-25-005458","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025005458/primarydocument.xml","form_type":"4"}},{"id":1085642,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-07-17T21:47:32.000Z","date":"2025-06-11","kind":"exercise","planned":true,"acquired":true,"shares":7500,"price":4.19,"value":31425.0,"ownership":{"direct":true},"balance_after":100000,"source":{"system":"sec-edgar","filing":"0001562180-25-005458","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025005458/primarydocument.xml","form_type":"4"}},{"id":1090718,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31726,"kind":"person","name":"Tzuo Tien","position":1,"cik":"0001735409","reported_name":"Tzuo Tien","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-07-08T20:55:21.000Z","date":"2025-07-05","kind":"grant","planned":false,"acquired":true,"shares":894,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the\"Program\") in lieu of retainer fees. Each RSU represents a right to receive one share of Class A Common Stock. Vesting of the RSUs has been deferred pursuant to the terms of the Program."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 45,754 RSUs."}],"balance_after":96566,"source":{"system":"sec-edgar","filing":"0001562180-25-005351","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025005351/primarydocument.xml","form_type":"4"}},{"id":1109949,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":19580,"kind":"person","name":"Vishria Eric","position":1,"cik":"0001617474","reported_name":"Vishria Eric","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-06-16T21:53:08.000Z","date":"2025-06-12","kind":"grant","planned":false,"acquired":true,"shares":14906,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the \"Program\"). Each RSU represents a right to receive one share of Class A Common Stock. The RSUs will vest in full on the earlier of (i) June 12, 2026 or (ii) immediately before the Issuer's 2026 annual meeting of stockholders, subject to the reporting person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 14,906 RSUs."}],"balance_after":64712,"source":{"system":"sec-edgar","filing":"0001562180-25-004863","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025004863/primarydocument.xml","form_type":"4"}},{"id":1109948,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":39310,"kind":"person","name":"Grady Patrick W","position":1,"cik":"0001700423","reported_name":"Grady Patrick W","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2025-06-16T21:18:14.000Z","date":"2025-06-12","kind":"grant","planned":false,"acquired":true,"shares":14906,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program. Each RSU represents a right to receive one share of Class A Common Stock. The RSUs will vest in full on the earlier of (ii) June 12, 2026 or immediately before the Issuer's 2026 annual meeting of stockholders, subject to the Reporting Person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 14,906 RSUs."}],"balance_after":60949,"source":{"system":"sec-edgar","filing":"0000950170-25-086864","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000095017025086864/ownership.xml","form_type":"4"}},{"id":1109947,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":39311,"kind":"person","name":"Gill Ronald S","position":1,"cik":"0001494474","reported_name":"Gill Ronald S","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-06-16T21:03:17.000Z","date":"2025-06-12","kind":"grant","planned":false,"acquired":true,"shares":14906,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the \"Program\"). Each RSU represents a right to receive one share of Class A Common Stock. The RSUs will vest in full on the earlier of (i) June 12, 2026 or (ii) immediately before the Issuer's 2026 annual meeting of stockholders, subject to the reporting person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 14,906 RSUs."}],"balance_after":74678,"source":{"system":"sec-edgar","filing":"0001562180-25-004858","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025004858/primarydocument.xml","form_type":"4"}},{"id":1109946,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":15619,"kind":"person","name":"Whitehurst James M","position":1,"cik":"0001292272","reported_name":"Whitehurst James M","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-06-16T21:03:05.000Z","date":"2025-06-12","kind":"grant","planned":false,"acquired":true,"shares":14906,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the \"Program\"). Each RSU represents a right to receive one share of Class A Common Stock. The RSUs will vest in full on the earlier of (i) June 12, 2026 or (ii) immediately before the Issuer's 2026 annual meeting of stockholders, subject to the reporting person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 26,263 RSUs."}],"balance_after":162344,"source":{"system":"sec-edgar","filing":"0001562180-25-004857","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025004857/primarydocument.xml","form_type":"4"}},{"id":1109945,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-06-16T21:02:55.000Z","date":"2025-06-12","kind":"grant","planned":false,"acquired":true,"shares":14906,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the \"Program\"). Each RSU represents a right to receive one share of Class A Common Stock. The RSUs will vest in full on the earlier of (i) June 12, 2026 or (ii) immediately before the Issuer's 2026 annual meeting of stockholders, subject to the reporting person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 14,906 RSUs."}],"balance_after":107406,"source":{"system":"sec-edgar","filing":"0001562180-25-004856","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025004856/primarydocument.xml","form_type":"4"}},{"id":1109944,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":38220,"kind":"person","name":"Wong Catherine","position":1,"cik":"0001744910","reported_name":"Wong Catherine","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-06-16T21:02:42.000Z","date":"2025-06-12","kind":"grant","planned":false,"acquired":true,"shares":14906,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units (\"RSUs\") that were granted pursuant to the Issuer's Non-Employee Director Compensation Program (the \"Program\"). Each RSU represents a right to receive one share of Class A Common Stock. The RSUs will vest in full on the earlier of (i) June 12, 2026 or (ii) immediately before the Issuer's 2026 annual meeting of stockholders, subject to the reporting person's continued service on the Board through such vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 14,906 RSUs."}],"balance_after":94058,"source":{"system":"sec-edgar","filing":"0001562180-25-004855","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025004855/primarydocument.xml","form_type":"4"}},{"id":1111971,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":31725,"kind":"person","name":"Schultz Erica","position":1,"cik":"0001542687","reported_name":"Schultz Erica","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-06-13T20:48:10.000Z","date":"2025-06-11","kind":"sale","planned":true,"acquired":false,"shares":26394,"price":12.4926,"value":329729.6844,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on March 12, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $12.3000 to $12.6800, 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."}],"balance_after":92500,"source":{"system":"sec-edgar","filing":"0001562180-25-004823","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025004823/primarydocument.xml","form_type":"4"}},{"id":1111970,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":38220,"kind":"person","name":"Wong Catherine","position":1,"cik":"0001744910","reported_name":"Wong Catherine","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-06-13T20:47:58.000Z","date":"2025-06-11","kind":"sale","planned":true,"acquired":false,"shares":8502,"price":12.4917,"value":106204.4334,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares sold to satisfy tax obligations in connection with the vesting of restricted stock units (\"RSUs\"), pursuant to a 10b5-1 trading plan adopted by the Reporting Person on December 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $12.3000 to $12.6900, 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."}],"balance_after":79152,"source":{"system":"sec-edgar","filing":"0001562180-25-004822","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025004822/primarydocument.xml","form_type":"4"}},{"id":1139138,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":38220,"kind":"person","name":"Wong Catherine","position":1,"cik":"0001744910","reported_name":"Wong Catherine","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-05-21T21:22:52.000Z","date":"2025-05-19","kind":"sale","planned":true,"acquired":false,"shares":3515,"price":11.7514,"value":41306.171,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Shares sold to satisfy tax obligations in connection with the vesting of restricted stock units (\"RSUs\"), pursuant to a 10b5-1 trading plan adopted by the Reporting Person on December 10, 2024."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades in prices ranging from $11.5900 to $11.8900, 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 18,894 RSUs."}],"balance_after":87654,"source":{"system":"sec-edgar","filing":"0001562180-25-004067","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025004067/primarydocument.xml","form_type":"4"}},{"id":1143083,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":22313,"kind":"person","name":"Liu Curtis","position":1,"cik":"0001883022","reported_name":"Liu Curtis","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Class A Common Stock","published_at":"2025-05-19T21:22:54.000Z","date":"2025-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":25533,"price":12.14,"value":309970.62,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on May 15, 2025, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 781,805 RSUs."}],"balance_after":827345,"source":{"system":"sec-edgar","filing":"0001562180-25-004004","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1883022/000156218025004004/primarydocument.xml","form_type":"4"}},{"id":1143021,"issuer":{"id":4566,"kind":"organization","name":"Amplitude, Inc.","symbol":"AMPL"},"owners":[{"id":66223,"kind":"person","name":"HANSEN THOMAS NEERGAARD","position":1,"cik":"0001728084","reported_name":"HANSEN THOMAS NEERGAARD","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Class A Common Stock","published_at":"2025-05-19T21:22:43.000Z","date":"2025-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":95810,"price":12.14,"value":1163133.4,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents shares of the Issuer's Class A Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of the Issuer's Class A Common Stock delivered to the reporting person on May 15, 2025, from the vesting of restricted stock units (\"RSUs\"), and does not represent a sale by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,509,531 RSUs."}],"balance_after":2102414,"source":{"system":"sec-edgar","filing":"0001562180-25-004003","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000156218025004003/primarydocument.xml","form_type":"4"}}],"next_cursor":"2025-05-19T21:22:43.000000Z,1143021"}