{"transactions":[{"id":1403055,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series B Common Stock","published_at":"2024-09-18T21:41:24.000Z","date":"2024-09-17","kind":"exercise","planned":true,"acquired":true,"shares":32733,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Consists of (i) 178,203 shares of Series B Common Stock and (ii) 80,844 unvested restricted stock units awarded under the Issuer's 2015 Stock Incentive Plan, each representing the contingent right to receive one share of Series B Common Stock upon vesting and settlement."}],"balance_after":259047,"derivative":{"underlying":"Series A Common Stock","underlying_shares":32733},"source":{"system":"sec-edgar","filing":"0001835830-24-000095","document":"wk-form4_1726695677.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000095/wk-form4_1726695677.xml","form_type":"4"}},{"id":1403054,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2024-09-18T21:41:24.000Z","date":"2024-09-17","kind":"exercise","planned":true,"acquired":false,"shares":32733,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The shares underlying this option are fully vested and exercisable by the Reporting Person as of the date hereof."}],"balance_after":995960,"derivative":{"exercise_price":3.055,"expiration_date":"2030-04-15","underlying":"Series B Common Stock","underlying_shares":32733},"source":{"system":"sec-edgar","filing":"0001835830-24-000095","document":"wk-form4_1726695677.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000095/wk-form4_1726695677.xml","form_type":"4"}},{"id":1403053,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series B Common Stock","published_at":"2024-09-18T21:41:24.000Z","date":"2024-09-16","kind":"exercise","planned":true,"acquired":false,"shares":130000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."}],"balance_after":226314,"derivative":{"underlying":"Series A Common Stock","underlying_shares":130000},"source":{"system":"sec-edgar","filing":"0001835830-24-000095","document":"wk-form4_1726695677.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000095/wk-form4_1726695677.xml","form_type":"4"}},{"id":1403052,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series B Common Stock","published_at":"2024-09-18T21:41:24.000Z","date":"2024-09-16","kind":"exercise","planned":true,"acquired":true,"shares":130000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."}],"balance_after":356314,"derivative":{"underlying":"Series A Common Stock","underlying_shares":130000},"source":{"system":"sec-edgar","filing":"0001835830-24-000095","document":"wk-form4_1726695677.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000095/wk-form4_1726695677.xml","form_type":"4"}},{"id":1403051,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2024-09-18T21:41:24.000Z","date":"2024-09-16","kind":"exercise","planned":true,"acquired":false,"shares":130000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The shares underlying this option are fully vested and exercisable by the Reporting Person as of the date hereof."}],"balance_after":1028693,"derivative":{"exercise_price":3.055,"expiration_date":"2030-04-15","underlying":"Series B Common Stock","underlying_shares":130000},"source":{"system":"sec-edgar","filing":"0001835830-24-000095","document":"wk-form4_1726695677.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000095/wk-form4_1726695677.xml","form_type":"4"}},{"id":1403050,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-09-18T21:41:24.000Z","date":"2024-09-16","kind":"sale","planned":true,"acquired":false,"shares":28934,"price":31.21,"value":903030.14,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $30.65 to $31.49 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001835830-24-000095","document":"wk-form4_1726695677.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000095/wk-form4_1726695677.xml","form_type":"4"}},{"id":1403049,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-09-18T21:41:24.000Z","date":"2024-09-16","kind":"sale","planned":true,"acquired":false,"shares":101066,"price":32.03,"value":3237143.98,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $31.50 to $32.50 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":28934,"source":{"system":"sec-edgar","filing":"0001835830-24-000095","document":"wk-form4_1726695677.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000095/wk-form4_1726695677.xml","form_type":"4"}},{"id":1403048,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-09-18T21:41:24.000Z","date":"2024-09-16","kind":"exercise","planned":true,"acquired":true,"shares":130000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."}],"balance_after":130000,"source":{"system":"sec-edgar","filing":"0001835830-24-000095","document":"wk-form4_1726695677.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000095/wk-form4_1726695677.xml","form_type":"4"}},{"id":1430821,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series B Common Stock","published_at":"2024-08-16T23:48:34.000Z","date":"2024-08-15","kind":"exercise","planned":false,"acquired":false,"shares":13161,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents 13,161 shares of the Issuer's Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), automatically converted into shares of the Issuer's Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), in connection with tax withholding obligations related to the vesting and settlement of restricted stock units (\"RSUs\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Consists of (i) 145,470 shares of Series B Common Stock and (ii) 80,844 unvested RSUs awarded under the Issuer's 2015 Stock Incentive Plan, each representing the contingent right to receive one share of Series B Common Stock upon vesting and settlement."}],"balance_after":226314,"derivative":{"underlying":"Series A Common Stock","underlying_shares":13161},"source":{"system":"sec-edgar","filing":"0001835830-24-000088","document":"wk-form4_1723852108.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000088/wk-form4_1723852108.xml","form_type":"4"}},{"id":1430820,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-08-16T23:48:34.000Z","date":"2024-08-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":13161,"price":31.83,"value":418914.63,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Represents shares of Series A Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of RSUs."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001835830-24-000088","document":"wk-form4_1723852108.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000088/wk-form4_1723852108.xml","form_type":"4"}},{"id":1430819,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-08-16T23:48:34.000Z","date":"2024-08-15","kind":"exercise","planned":false,"acquired":true,"shares":13161,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents 13,161 shares of the Issuer's Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), automatically converted into shares of the Issuer's Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), in connection with tax withholding obligations related to the vesting and settlement of restricted stock units (\"RSUs\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."}],"balance_after":13161,"source":{"system":"sec-edgar","filing":"0001835830-24-000088","document":"wk-form4_1723852108.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000088/wk-form4_1723852108.xml","form_type":"4"}},{"id":1433274,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series B Common Stock","published_at":"2024-08-14T21:41:14.000Z","date":"2024-08-13","kind":"exercise","planned":true,"acquired":true,"shares":32733,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Consists of (i) 131,412 shares of Series B Common Stock and (ii) 108,063 unvested restricted stock units awarded under the Issuer's 2015 Stock Incentive Plan, each representing the contingent right to receive one share of Series B Common Stock upon vesting and settlement."}],"balance_after":239475,"derivative":{"underlying":"Series A Common Stock","underlying_shares":32733},"source":{"system":"sec-edgar","filing":"0001835830-24-000083","document":"wk-form4_1723671667.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000083/wk-form4_1723671667.xml","form_type":"4"}},{"id":1433273,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2024-08-14T21:41:14.000Z","date":"2024-08-13","kind":"exercise","planned":true,"acquired":false,"shares":32733,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The shares underlying this option are fully vested and exercisable by the Reporting Person as of the date hereof."}],"balance_after":1158693,"derivative":{"exercise_price":3.055,"expiration_date":"2030-04-15","underlying":"Series B Common Stock","underlying_shares":32733},"source":{"system":"sec-edgar","filing":"0001835830-24-000083","document":"wk-form4_1723671667.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000083/wk-form4_1723671667.xml","form_type":"4"}},{"id":1433272,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series B Common Stock","published_at":"2024-08-14T21:41:14.000Z","date":"2024-08-12","kind":"exercise","planned":true,"acquired":false,"shares":130000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."}],"balance_after":206742,"derivative":{"underlying":"Series A Common Stock","underlying_shares":130000},"source":{"system":"sec-edgar","filing":"0001835830-24-000083","document":"wk-form4_1723671667.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000083/wk-form4_1723671667.xml","form_type":"4"}},{"id":1433271,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series B Common Stock","published_at":"2024-08-14T21:41:14.000Z","date":"2024-08-12","kind":"exercise","planned":true,"acquired":true,"shares":130000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Each share of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), is convertible at any time at the option of the holder into one share of Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), of the Issuer, and will automatically convert into shares of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."}],"balance_after":336742,"derivative":{"underlying":"Series A Common Stock","underlying_shares":130000},"source":{"system":"sec-edgar","filing":"0001835830-24-000083","document":"wk-form4_1723671667.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000083/wk-form4_1723671667.xml","form_type":"4"}},{"id":1433270,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Stock Option (Right to Buy)","published_at":"2024-08-14T21:41:14.000Z","date":"2024-08-12","kind":"exercise","planned":true,"acquired":false,"shares":130000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The shares underlying this option are fully vested and exercisable by the Reporting Person as of the date hereof."}],"balance_after":1191426,"derivative":{"exercise_price":3.055,"expiration_date":"2030-04-15","underlying":"Series B Common Stock","underlying_shares":130000},"source":{"system":"sec-edgar","filing":"0001835830-24-000083","document":"wk-form4_1723671667.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000083/wk-form4_1723671667.xml","form_type":"4"}},{"id":1433269,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-08-14T21:41:14.000Z","date":"2024-08-12","kind":"sale","planned":true,"acquired":false,"shares":10509,"price":31.17,"value":327565.53,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $31.00 to $31.30 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001835830-24-000083","document":"wk-form4_1723671667.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000083/wk-form4_1723671667.xml","form_type":"4"}},{"id":1433268,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-08-14T21:41:14.000Z","date":"2024-08-12","kind":"sale","planned":true,"acquired":false,"shares":119491,"price":31.63,"value":3779500.33,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2023."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $31.31 to $32.30 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":10509,"source":{"system":"sec-edgar","filing":"0001835830-24-000083","document":"wk-form4_1723671667.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000083/wk-form4_1723671667.xml","form_type":"4"}},{"id":1433267,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-08-14T21:41:14.000Z","date":"2024-08-12","kind":"exercise","planned":true,"acquired":true,"shares":130000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":130000,"source":{"system":"sec-edgar","filing":"0001835830-24-000083","document":"wk-form4_1723671667.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000083/wk-form4_1723671667.xml","form_type":"4"}},{"id":1510269,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series B Common Stock","published_at":"2024-05-17T20:18:05.000Z","date":"2024-05-15","kind":"exercise","planned":false,"acquired":false,"shares":12004,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock, and will automatically convert into Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents 12,004 shares of the Issuer's Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), automatically converted into shares of the Issuer's Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), which were subsequently withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units (\"RSUs\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock, and will automatically convert into Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock, and will automatically convert into Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Consists of (i) 98,679 shares of Series B Common Stock and (ii) 108,063 unvested RSUs awarded under the Issuer's 2015 Stock Incentive Plan, each representing the contingent right to receive one share of Series B Common Stock upon vesting and settlement."}],"balance_after":206742,"derivative":{"underlying":"Series A Common Stock","underlying_shares":12004},"source":{"system":"sec-edgar","filing":"0001991400-24-000002","document":"wk-form4_1715977065.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000199140024000002/wk-form4_1715977065.xml","form_type":"4"}},{"id":1510268,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-05-17T20:18:05.000Z","date":"2024-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":12004,"price":24.8,"value":297699.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents 12,004 shares of the Issuer's Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), automatically converted into shares of the Issuer's Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), which were subsequently withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units (\"RSUs\")."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001991400-24-000002","document":"wk-form4_1715977065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000199140024000002/wk-form4_1715977065.xml","form_type":"4"}},{"id":1510267,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-05-17T20:18:05.000Z","date":"2024-05-15","kind":"exercise","planned":false,"acquired":true,"shares":12004,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents 12,004 shares of the Issuer's Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), automatically converted into shares of the Issuer's Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\"), which were subsequently withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units (\"RSUs\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock, and will automatically convert into Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."}],"balance_after":12004,"source":{"system":"sec-edgar","filing":"0001991400-24-000002","document":"wk-form4_1715977065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000199140024000002/wk-form4_1715977065.xml","form_type":"4"}},{"id":1637394,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series B Common Stock","published_at":"2024-02-16T21:50:52.000Z","date":"2024-02-15","kind":"exercise","planned":false,"acquired":false,"shares":9220,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock of the Issuer, and will automatically convert into Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents 9,220 shares of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), automatically converted into Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\") and subsequently withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units (\"RSUs\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock of the Issuer, and will automatically convert into Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock of the Issuer, and will automatically convert into Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Amount consists of (a) 83,464 shares of Series B Common Stock and (b) 135,282 unvested RSUs awarded under the 2015 Stock Incentive Plan, each representing the contingent right to receive one share of Series B Common Stock upon vesting and settlement."}],"balance_after":218746,"derivative":{"underlying":"Series A Common Stock","underlying_shares":9220},"source":{"system":"sec-edgar","filing":"0001835830-24-000008","document":"wk-form4_1708120229.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000008/wk-form4_1708120229.xml","form_type":"4"}},{"id":1637393,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-02-16T21:50:52.000Z","date":"2024-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":9220,"price":29.71,"value":273926.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents 9,220 shares of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), automatically converted into Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\") and subsequently withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units (\"RSUs\")."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001835830-24-000008","document":"wk-form4_1708120229.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000008/wk-form4_1708120229.xml","form_type":"4"}},{"id":1637392,"issuer":{"id":3775,"kind":"organization","name":"Klaviyo, Inc.","symbol":"KVYO"},"owners":[{"id":87409,"kind":"person","name":"Chaves Allen","position":1,"cik":"0001991400","reported_name":"Chaves Allen","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Series A Common Stock","published_at":"2024-02-16T21:50:52.000Z","date":"2024-02-15","kind":"exercise","planned":false,"acquired":true,"shares":9220,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents 9,220 shares of Series B Common Stock, par value $0.001 per share (\"Series B Common Stock\"), automatically converted into Series A Common Stock, par value $0.001 per share (\"Series A Common Stock\") and subsequently withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units (\"RSUs\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Each share of Series B Common Stock is convertible at any time at the option of the holder into one share of Series A Common Stock of the Issuer, and will automatically convert into Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date."}],"balance_after":9220,"source":{"system":"sec-edgar","filing":"0001835830-24-000008","document":"wk-form4_1708120229.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1835830/000183583024000008/wk-form4_1708120229.xml","form_type":"4"}}]}