{"transactions":[{"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":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":773420,"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":"2026-05-19T20:27:24.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":39562,"price":6.06,"value":239745.72,"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 1,212,859 RSUs."}],"balance_after":1283557,"source":{"system":"sec-edgar","filing":"0001882913-26-000004","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291326000004/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. 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 1,323,119 RSUs."}],"balance_after":1323119,"source":{"system":"sec-edgar","filing":"0001882913-26-000002","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000188291326000002/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":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":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":2380116,"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":"2022-02-23T23:17:47.000Z","date":"2022-02-18","kind":"exercise","acquired":true,"shares":70000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":"Represents the conversion of Class A Common Stock into the Issuer's Class B Common Stock effected pursuant to an amendment to the Issuer's Amended and Restated 2014 Stock Option and Grant Plan, which gave holders a one-time right to exchange such shares of Class A Common Stock for an equal number of shares of Class B Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":"F4","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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":6352146,"derivative":{"underlying":"Class A Common Stock","underlying_shares":70000},"source":{"system":"sec-edgar","filing":"0001567619-22-005409","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000156761922005409/doc1.xml","form_type":"4"}},{"id":2380115,"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":"2022-02-23T23:17:47.000Z","date":"2022-02-18","kind":"exercise","acquired":true,"shares":30000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":"Represents the conversion of Class A Common Stock into the Issuer's Class B Common Stock effected pursuant to an amendment to the Issuer's Amended and Restated 2014 Stock Option and Grant Plan, which gave holders a one-time right to exchange such shares of Class A Common Stock for an equal number of shares of Class B Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":"F4","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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":6282146,"derivative":{"underlying":"Class A Common 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the shares subject to the option vest on each monthly anniversary measured from September 21, 2021 (the \"Vesting Commencement Date\"), such that 100% of the shares subject to the option will be fully vested on the second anniversary of the Vesting Commencement Date."}],"balance_after":1101030,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-28","underlying":"Class A Common Stock","underlying_shares":70000},"source":{"system":"sec-edgar","filing":"0001567619-22-005409","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000156761922005409/doc1.xml","form_type":"4"}},{"id":2380113,"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":"Stock Option (Right to Buy)","published_at":"2022-02-23T23:17:47.000Z","date":"2022-02-18","kind":"exercise","acquired":false,"shares":30000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"1/48th of the shares subject to the option vest on each monthly anniversary measured from January 1, 2021 (the \"Vesting Commencement Date\"), such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date."}],"balance_after":89330,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-28","underlying":"Class A Common 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Issuer's Class B Common Stock effected pursuant to an amendment to the Issuer's Amended and Restated 2014 Stock Option and Grant Plan, which gave holders a one-time right to exchange such shares of Class A Common Stock for an equal number of shares of Class B Common Stock."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001567619-22-005409","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000156761922005409/doc1.xml","form_type":"4"}},{"id":2380111,"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 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The Class B Common Stock will convert automatically into shares of the Issuer's Class A Common Stock on a one-to-one basis upon the earlier of (a) any transfer of the Class B Common Stock by the holder, whether or not for value, subject to certain exceptions, (b) the death or incapacity of the holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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 the holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":6252146,"derivative":{"underlying":"Class A Common Stock","underlying_shares":189000},"source":{"system":"sec-edgar","filing":"0000899243-21-048406","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321048406/doc4.xml","form_type":"4"}},{"id":2472267,"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":"2021-12-16T00:06:25.000Z","date":"2021-12-13","kind":"gift","acquired":false,"shares":189000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"source":{"system":"sec-edgar","filing":"0000899243-21-048406","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321048406/doc4.xml","form_type":"4"}},{"id":2472266,"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":"2021-12-16T00:06:25.000Z","date":"2021-12-13","kind":"exercise","acquired":true,"shares":189000,"price":0,"value":0.0,"ownership":{"direct":true},"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 the holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":189000,"source":{"system":"sec-edgar","filing":"0000899243-21-048406","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321048406/doc4.xml","form_type":"4"}},{"id":2550253,"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":"2021-10-05T20:05:37.000Z","date":"2021-10-01","kind":"sale","acquired":false,"shares":25000,"price":54.228,"value":1355700.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades in prices ranging from $54.00 to $54.48, 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":0,"source":{"system":"sec-edgar","filing":"0000899243-21-039182","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321039182/doc4.xml","form_type":"4"}},{"id":2556203,"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":"2021-09-30T23:16:32.000Z","date":"2021-09-28","kind":"sale","acquired":false,"shares":25000,"price":52,"value":1300000.0,"ownership":{"direct":true},"balance_after":25000,"source":{"system":"sec-edgar","filing":"0000899243-21-038454","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321038454/doc4.xml","form_type":"4"}},{"id":2556202,"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":"2021-09-30T23:16:32.000Z","date":"2021-09-28","kind":"sale","acquired":false,"shares":550000,"price":50,"value":27500000.0,"ownership":{"direct":true},"balance_after":50000,"source":{"system":"sec-edgar","filing":"0000899243-21-038454","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321038454/doc4.xml","form_type":"4"}},{"id":2561273,"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":"2021-09-24T01:30:15.000Z","date":"2021-09-10","kind":"sale","acquired":false,"shares":290322,"price":31,"value":8999982.0,"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 the holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":"Transaction is being reported herein pursuant to Rule 16a-2(a)."},{"field":"kind","element":"transactionCoding","label":"F5","text":"The securities were sold in a private secondary sale transaction."},{"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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":7041146,"derivative":{"underlying":"Class A Common Stock","underlying_shares":290322},"source":{"system":"sec-edgar","filing":"0000899243-21-037512","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321037512/doc4.xml","form_type":"4"}},{"id":2561272,"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":"2021-09-24T01:30:15.000Z","date":"2021-09-10","kind":"gift","acquired":false,"shares":759352,"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 the holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":"Transaction is being reported herein pursuant to Rule 16a-2(a)."},{"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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":7331468,"derivative":{"underlying":"Class A Common Stock","underlying_shares":759352},"source":{"system":"sec-edgar","filing":"0000899243-21-037512","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321037512/doc4.xml","form_type":"4"}},{"id":2561271,"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":"2021-09-24T01:30:15.000Z","date":"2021-08-30","kind":"exercise","acquired":true,"shares":310000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F4","text":"In connection with the reclassification of the Issuer's Common Stock on August 30, 2021, each share of Common Stock held by the Reporting Person was automatically reclassified as Class B Common Stock."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The Class B Common Stock is convertible at any time at the option of the holder into the Issuer's Class A Common Stock on a one-to-one basis. 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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":"Transaction is being reported herein pursuant to Rule 16a-2(a)."},{"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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":8090820,"derivative":{"underlying":"Class A Common Stock","underlying_shares":310000},"source":{"system":"sec-edgar","filing":"0000899243-21-037512","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321037512/doc4.xml","form_type":"4"}},{"id":2561270,"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":"Stock Option (Right to Buy)","published_at":"2021-09-24T01:30:15.000Z","date":"2021-08-30","kind":"exercise","acquired":false,"shares":310000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Transaction is being reported herein pursuant to Rule 16a-2(a)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The option is early exercisable.  1/48th of the shares subject to the option vest on each monthly anniversary measured from January 1, 2021 (the \"Vesting Commencement Date\"), such that 100% of the shares subject to the option will be fully vested on the fourth anniversary of the Vesting Commencement Date."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F4","text":"In connection with the reclassification of the Issuer's Common Stock on August 30, 2021, each share of Common Stock held by the Reporting Person was automatically reclassified as Class B Common Stock."}],"balance_after":681700,"derivative":{"exercise_price":4.19,"expiration_date":"2030-12-28","underlying":"Common Stock","underlying_shares":310000},"source":{"system":"sec-edgar","filing":"0000899243-21-037512","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321037512/doc4.xml","form_type":"4"}},{"id":2561269,"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":"2021-09-24T01:30:15.000Z","date":"2021-09-21","kind":"exercise","acquired":false,"shares":600000,"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 the holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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 the holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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 holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":6441146,"derivative":{"underlying":"Class A Common Stock","underlying_shares":600000},"source":{"system":"sec-edgar","filing":"0000899243-21-037512","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321037512/doc4.xml","form_type":"4"}},{"id":2561268,"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":"2021-09-24T01:30:15.000Z","date":"2021-09-21","kind":"exercise","acquired":true,"shares":600000,"price":0,"value":0.0,"ownership":{"direct":true},"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 the holder, (c) the date that is six months following the date on which the holder is no longer an employee or director of the Issuer (unless such holder 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":600000,"source":{"system":"sec-edgar","filing":"0000899243-21-037512","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1882913/000089924321037512/doc4.xml","form_type":"4"}}]}