{"transactions":[{"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":772616,"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":"2026-05-19T20:27:54.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":64872,"price":6.06,"value":393124.32,"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 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, 2026."}],"balance_after":1436152,"source":{"system":"sec-edgar","filing":"0002032390-26-000006","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000203239026000006/primarydocument.xml","form_type":"4"}},{"id":805904,"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":"2026-04-17T21:54:10.000Z","date":"2026-04-15","kind":"grant","planned":false,"acquired":true,"shares":431754,"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 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":901458,"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":"2026-02-17T21:34:03.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":39438,"price":6.34,"value":250036.92,"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 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  669,405 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":996141,"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":"2025-11-18T22:17:30.000Z","date":"2025-11-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":54400,"price":10.73,"value":583712.0,"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 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":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":1062201,"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":"2025-08-19T21:44:48.000Z","date":"2025-08-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":54399,"price":11.47,"value":623956.53,"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, 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":1143252,"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":"2025-05-19T21:22:24.000Z","date":"2025-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":54399,"price":12.14,"value":660403.86,"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 990,782 RSUs."}],"balance_after":1182507,"source":{"system":"sec-edgar","filing":"0001562180-25-004002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000156218025004002/primarydocument.xml","form_type":"4"}},{"id":1164000,"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":"2025-04-29T20:59:34.000Z","date":"2025-04-25","kind":"grant","planned":false,"acquired":true,"shares":159914,"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 twelve substantially equal quarterly installments beginning on May 15, 2025, subject to the continued service of the reporting person through each vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,097,907 RSUs."}],"balance_after":1236906,"source":{"system":"sec-edgar","filing":"0001562180-25-003351","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000156218025003351/primarydocument.xml","form_type":"4"}},{"id":1204267,"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":"2025-03-17T20:34:08.000Z","date":"2025-03-13","kind":"purchase","planned":false,"acquired":true,"shares":21000,"price":11.4174,"value":239765.4,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $11.27 to $11.52, 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 937,993 restricted stock units."}],"balance_after":1076992,"source":{"system":"sec-edgar","filing":"0001562180-25-002468","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000156218025002468/primarydocument.xml","form_type":"4"}},{"id":1264382,"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":"2025-02-18T21:30:23.000Z","date":"2025-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":35748,"price":12.04,"value":430405.92,"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 February 15, 2025, from the vesting of RSUs, and does not represent a sale by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 937,993 RSUs."}],"balance_after":1055992,"source":{"system":"sec-edgar","filing":"0001562180-25-001239","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000156218025001239/primarydocument.xml","form_type":"4"}},{"id":1359804,"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":"2024-11-19T21:42:08.000Z","date":"2024-11-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":33852,"price":9.59,"value":324640.68,"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 November 15, 2024, from the vesting of RSUs, and does not represent a sale by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,031,793 RSUs."}],"balance_after":1091740,"source":{"system":"sec-edgar","filing":"0001562180-24-007799","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000156218024007799/primarydocument.xml","form_type":"4"}},{"id":1405501,"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":"2024-09-17T21:06:08.000Z","date":"2024-09-15","kind":"grant","planned":false,"acquired":true,"shares":1125592,"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 twelve substantially equal quarterly installments beginning on November 15, 2024, subject to the continued service of the reporting person through each vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Consists of 1,125,592 RSUs."}],"balance_after":1125592,"source":{"system":"sec-edgar","filing":"0001562180-24-006847","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2032390/000156218024006847/primarydocument.xml","form_type":"4"}}]}