{"transactions":[{"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":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":772356,"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":"2026-05-19T20:28:13.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":101292,"price":6.06,"value":613829.52,"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, 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 1,471,366 RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 2,330 shares acquired under the Issuer's employee stock purchase plan on May 14, 2026."}],"balance_after":2032064,"source":{"system":"sec-edgar","filing":"0002121274-26-000004","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000212127426000004/primarydocument.xml","form_type":"4"}},{"id":805780,"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":974930,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Each RSU represents a right to receive one share of the Issuer's Class A Common Stock. 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. The RSUs vest in four 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 726,441 restricted stock units."}],"balance_after":1156096,"source":{"system":"sec-edgar","filing":"0002121274-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1866692/000212127426000002/primarydocument.xml","form_type":"4"}}]}