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RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 28,140 unvested RSUs."}],"balance_after":51890,"source":{"system":"sec-edgar","filing":"0001628280-26-048715","document":"wk-form4_1784326081.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000162828026048715/wk-form4_1784326081.xml","form_type":"4"}},{"id":805691,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common 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RSUs."}],"balance_after":58948,"source":{"system":"sec-edgar","filing":"0001628280-26-025910","document":"wk-form4_1776472376.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000162828026025910/wk-form4_1776472376.xml","form_type":"4"}},{"id":927930,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2026-01-30T00:24:30.000Z","date":"2026-01-28","kind":"tax_withholding","planned":false,"acquired":false,"shares":211,"price":4.18,"value":881.98,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Upon the vesting of 375 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 211 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 42,680 unvested RSUs."}],"balance_after":59289,"source":{"system":"sec-edgar","filing":"0001628280-26-004228","document":"wk-form4_1769732667.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000162828026004228/wk-form4_1769732667.xml","form_type":"4"}},{"id":937301,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich 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vesting of 375 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 158 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 43,725 unvested RSUs."}],"balance_after":59877,"source":{"system":"sec-edgar","filing":"0001628280-25-047629","document":"wk-form4_1761862603.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000162828025047629/wk-form4_1761862603.xml","form_type":"4"}},{"id":1016841,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich 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Subject to the continued employment of Ms. Sestanovich through the applicable vesting date, one-third of the RSUs will vest on July 15, 2026, and the remaining two-thirds will vest in 8 substantially equal quarterly installments on each quarterly anniversary thereafter."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 44,770 unvested RSUs."}],"balance_after":60317,"source":{"system":"sec-edgar","filing":"0001907093-25-000012","document":"wk-form4_1753918771.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709325000012/wk-form4_1753918771.xml","form_type":"4"}},{"id":1079177,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich 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vesting of 6,700 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 2,398 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 61,900 unvested RSUs."}],"balance_after":208271,"source":{"system":"sec-edgar","filing":"0001907093-25-000006","document":"wk-form4_1744929272.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709325000006/wk-form4_1744929272.xml","form_type":"4"}},{"id":1290818,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich 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vesting of 3,750 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 1,338 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 99,856 unvested RSUs."}],"balance_after":222989,"source":{"system":"sec-edgar","filing":"0001907093-24-000018","document":"wk-form4_1730424374.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709324000018/wk-form4_1730424374.xml","form_type":"4"}},{"id":1385916,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich 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vesting of 3,750 restricted stock units (\"RSUs\") previously granted to the Reporting Person, the Company withheld 1,338 shares to cover the Reporting Person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 104,711 unvested RSUs."}],"balance_after":224722,"source":{"system":"sec-edgar","filing":"0001907093-24-000014","document":"wk-form4_1722472449.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709324000014/wk-form4_1722472449.xml","form_type":"4"}},{"id":1450487,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich 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Subject to the continued employment of the Reporting Person through the applicable vesting date, one-third of the RSUs will vest on January 15, 2025, and the remaining two-thirds will vest in 8 substantially equal quarterly installments on each quarterly anniversary thereafter."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 108,461 unvested RSUs."}],"balance_after":226060,"source":{"system":"sec-edgar","filing":"0001907093-24-000012","document":"wk-form4_1721694746.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709324000012/wk-form4_1721694746.xml","form_type":"4"}},{"id":1452666,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2024-07-18T00:13:52.000Z","date":"2024-07-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":395,"price":1.5,"value":592.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Upon the vesting of 1,105 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 395 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 28,461 unvested RSUs."}],"balance_after":146060,"source":{"system":"sec-edgar","filing":"0001907093-24-000010","document":"wk-form4_1721261625.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709324000010/wk-form4_1721261625.xml","form_type":"4"}},{"id":1460166,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Stock Appreciation Rights","published_at":"2024-07-04T01:08:13.000Z","date":"2024-07-01","kind":"grant","planned":false,"acquired":true,"shares":450000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"These stock appreciation rights (these \"SARs\") were granted to the Reporting Person pursuant to the System1, Inc. 2024 Stock Appreciation Rights Plan, as amended (the \"Plan\") and a corresponding Stock Appreciation Rights Grant Notice and Award Agreement between System1, Inc. (the \"Issuer\") and the Reporting Person.   The SARs reported on this Form 4 represent the right to receive (at the Issuer's discretion), upon exercise of the SARs by the Reporting Person, a payment in either (x) Class A Common Stock, par value $0.0001 per share (\"Class A Common Stock\") or (y) cash, in the amount equal to the number of shares of Class A Common Stock underlying the number of SARs being exercised multiplied by the excess of the fair market value of one share of Class A Common Stock on (i) the date the SARs are exercised, and (ii) $1.44, the Issuer's closing price on July 1, 2024 (the date the SARs were granted, the \"Grant Date\")."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"These Stock Appreciation Rights (\"SARs\") were granted to the Reporting Person on July 1, 2024 under the System1, Inc. 2024 Stock Appreciation Rights Plan, as amended (the \"Plan\") and vest (i) 25% upon the Issuer first achieving trailing twelve month Adjusted EBITDA (\"TTM Adjusted EBITDA\") of $50.0 million after the date of grant, (ii) 25% upon the Issuer first achieving TTM Adjusted EBITDA of $60.0 million after the date of grant, (iii) 25% upon the Issuer first achieving TTM Adjusted EBITDA of $70.0 million after the date of grant and (iv) 25% upon the Issuer first achieving TTM Adjusted EBITDA of $80.0 million after the date of grant, in each case, subject to the terms of the Plan and an award agreement entered into between the Reporting Person and the Issuer pursuant to the Plan."}],"balance_after":450000,"derivative":{"exercise_price":1.44,"expiration_date":"2031-07-01","underlying":"Class A Common Stock","underlying_shares":450000},"source":{"system":"sec-edgar","filing":"0001628280-24-031217","document":"wk-form4_1720055286.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000162828024031217/wk-form4_1720055286.xml","form_type":"4"}},{"id":1532892,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2024-05-01T00:32:28.000Z","date":"2024-04-29","kind":"tax_withholding","planned":false,"acquired":false,"shares":1338,"price":1.73,"value":2314.74,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Upon the vesting of 3,750 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 1,338 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 29,566 unvested RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 174 shares received in connection with pro-rata distributions from OpenMail2, LLC to its members, for no consideration and in an exempt transaction under Rule 16a-9, since the Reporting Person's last reportable transaction filed on Form 4."}],"balance_after":146455,"source":{"system":"sec-edgar","filing":"0001907093-24-000008","document":"wk-form4_1714523539.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709324000008/wk-form4_1714523539.xml","form_type":"4"}},{"id":1540050,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2024-04-17T23:57:13.000Z","date":"2024-04-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":395,"price":2.19,"value":865.05,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Upon the vesting of 1,105 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 395 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 174 shares received in connection with pro-rata distributions from OpenMail2, LLC to its members, for no consideration and in an exempt transaction under Rule 16a-9, since the Reporting Person's last reportable transaction filed on Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 33,316 unvested RSUs."}],"balance_after":147619,"source":{"system":"sec-edgar","filing":"0001907093-24-000006","document":"wk-form4_1713398223.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709324000006/wk-form4_1713398223.xml","form_type":"4"}},{"id":1666612,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2024-01-31T00:27:04.000Z","date":"2024-01-26","kind":"tax_withholding","planned":false,"acquired":false,"shares":15061,"price":1.98,"value":29820.78,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Upon the vesting of 36,750 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 15,061 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 34,421 unvested RSUs."}],"balance_after":147840,"source":{"system":"sec-edgar","filing":"0001907093-24-000004","document":"wk-form4_1706660814.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709324000004/wk-form4_1706660814.xml","form_type":"4"}},{"id":1677999,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich 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transaction filed on Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 71,171 unvested RSUs."}],"balance_after":162901,"source":{"system":"sec-edgar","filing":"0001907093-24-000002","document":"wk-form4_1705537425.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709324000002/wk-form4_1705537425.xml","form_type":"4"}},{"id":1753205,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common 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RSUs."}],"balance_after":162483,"source":{"system":"sec-edgar","filing":"0001907093-23-000016","document":"wk-form4_1698792220.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709323000016/wk-form4_1698792220.xml","form_type":"4"}},{"id":1759059,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2023-10-18T00:01:39.000Z","date":"2023-10-16","kind":"tax_withholding","planned":false,"acquired":false,"shares":383,"price":1.19,"value":455.77,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Upon the vesting of 1.106 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 383 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 79,026 unvested RSUs."}],"balance_after":164818,"source":{"system":"sec-edgar","filing":"0001907093-23-000014","document":"wk-form4_1697587290.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709323000014/wk-form4_1697587290.xml","form_type":"4"}},{"id":1817992,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich 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(\"SST\"). Each RSU represents the right to receive one share of SST Class A Common Stock upon vesting. Subject to the continued employment of Ms. Sestanovich through the applicable vesting date, all 30,000 of the RSUs will vest in full on January 27, 2024."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 80,132 unvested RSUs."}],"balance_after":165201,"source":{"system":"sec-edgar","filing":"0001628280-23-026880","document":"wf-form4_169101524152236.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000162828023026880/wf-form4_169101524152236.xml","form_type":"4"}},{"id":1819317,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common 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4."}],"balance_after":135201,"source":{"system":"sec-edgar","filing":"0001907093-23-000013","document":"wf-form4_169093788975040.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709323000013/wf-form4_169093788975040.xml","form_type":"4"}},{"id":1827891,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common 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RSUs."}],"balance_after":136665,"source":{"system":"sec-edgar","filing":"0001907093-23-000011","document":"wf-form4_168972653375058.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709323000011/wf-form4_168972653375058.xml","form_type":"4"}},{"id":1908428,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common 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RSUs."}],"balance_after":137048,"source":{"system":"sec-edgar","filing":"0001907093-23-000009","document":"wf-form4_168305876654521.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709323000009/wf-form4_168305876654521.xml","form_type":"4"}},{"id":1918197,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common 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RSUs."}],"balance_after":138930,"source":{"system":"sec-edgar","filing":"0001907093-23-000007","document":"wf-form4_168186744887240.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709323000007/wf-form4_168186744887240.xml","form_type":"4"}},{"id":2040424,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2023-01-31T21:05:52.000Z","date":"2023-01-30","kind":"tax_withholding","acquired":false,"shares":1251,"price":4.91,"value":6142.41,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Upon the vesting of 3,000 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 1,251 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 65,842 unvested RSUs."}],"balance_after":138510,"source":{"system":"sec-edgar","filing":"0001907093-23-000004","document":"wf-form4_167519913722701.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709323000004/wf-form4_167519913722701.xml","form_type":"4"}},{"id":2052616,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich 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consideration and in an exempt transaction under Rule 16a-9, since the Reporting Person's last reportable transaction filed on Form 4."}],"balance_after":139761,"source":{"system":"sec-edgar","filing":"0001907093-23-000002","document":"wf-form4_167409068515556.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709323000002/wf-form4_167409068515556.xml","form_type":"4"}},{"id":2136396,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common 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RSUs."}],"balance_after":139646,"source":{"system":"sec-edgar","filing":"0001907093-22-000006","document":"wf-form4_166605568896163.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709322000006/wf-form4_166605568896163.xml","form_type":"4"}},{"id":2184387,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2022-08-16T23:54:31.000Z","date":"2022-08-15","kind":"tax_withholding","acquired":false,"shares":3060,"price":8.97,"value":27448.2,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Upon the vesting of 8,842 restricted stock units (\"RSUs\") previously granted to the reporting person, the Company withheld 3,060 shares to cover the reporting person's tax withholding obligation with respect to the vesting of such RSUs."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes shares received in connection with pro-rata distributions from OpenMail2, LLC to its member, for no consideration and in an exempt transaction under Rule 16a-9. The Form 4s filed on May 12, 2022 and June 22, 2022 by the reporting person did not previously include in Column 5 an aggregate of 1,394 and 871 shares, respectively, then held by the reporting person from prior exempt pro-rata distributions from OpenMail2, LLC under Rule 16a-9."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 72,526 unvested RSUs."}],"balance_after":140284,"source":{"system":"sec-edgar","filing":"0001907093-22-000004","document":"wf-form4_166069405679315.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709322000004/wf-form4_166069405679315.xml","form_type":"4"}},{"id":2224244,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2022-06-22T22:35:24.000Z","date":"2022-06-17","kind":"grant","acquired":true,"shares":21368,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Ms. Sestanovich was granted 21,368 restricted stock units (\"RSUs\") in connection with the replacement of previously unvested Value Creation Units of the Issuer's predecessor entity (the \"Original VCUs\") outstanding as of the closing of the Issuer's business combination transaction (the \"Replacement RSUs\"), of which 6,999 of the Replacement RSUs were deemed vested as of the grant date. Each Replacement RSU represents the right to receive one (1) share of SST Class A Common Stock upon vesting.  Subject to the continued employment of Ms. Sestanovich through the applicable vesting dates, the Replacement RSUs vest in quarterly installments over the course of the Original VCU remaining vesting schedule(s)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 74,369 unvested RSUs."}],"balance_after":140209,"source":{"system":"sec-edgar","filing":"0001907093-22-000002","document":"wf-form4_165593729571366.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000190709322000002/wf-form4_165593729571366.xml","form_type":"4"}},{"id":2273596,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2022-05-13T01:44:11.000Z","date":"2022-05-10","kind":"grant","acquired":true,"shares":60000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Ms. Sestanovich was granted 60,000 restricted stock units (\"RSUs\") in connection with her continued employment with System1, Inc. (\"SST\").  Each RSU represents the right to receive one share of SST Class A Common Stock upon vesting. Subject to the continued employment of Ms. Sestanovich through the applicable vesting dates, (i) 3,000 of the RSUs will vest on January 28, 2023, (ii) 9,000 of the RSUs will vest in quarterly installments of 2,250 each on January 28, April 28, July 28 and October 28, 2024 and (iii) the remaining 48,000 RSUs will vest in eight (8) quarterly installments of 6,000 each on the quarterly anniversary thereafter."}],"balance_after":118841,"source":{"system":"sec-edgar","filing":"0000899243-22-017933","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000089924322017933/doc4.xml","form_type":"4"}},{"id":2416941,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class B Units","published_at":"2022-02-03T02:21:16.000Z","date":"2022-01-27","kind":"grant","acquired":true,"shares":208595,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F3","text":"Represents Common Units of S1 Holdco, which are redeemable (in connection with the surrender and forfeiture of the corresponding shares of Class C common stock (See Footnote 2 above)) on a one-for-one basis for shares of the Company's Class A common stock, or, at the election of the Company, cash equal to the volume weighted average market price of a share of Class A Common Stock at the time of such redemption. The Common Units were acquired pursuant to a reclassification (exempt under Section 16b-7) and reorganization of the Company in connection with the Business Combination. Upon the closing of the Business Combination, the reporting person was issued one share of Class C Common Stock for each Common Unit held by the reporting person as of the closing. See Footnote 2 above."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","text":"The Common Units are redeemable (in connection with the surrender and forfeiture of the corresponding shares of Class C common stock (See Footnote 2 above)) on a one-for-one basis for shares of the Company's Class A Common Stock, or, at the election of the Company, cash equal to the volume weighted average market price of a share of Class A Common Stock at the time of such redemption. The Common Units have no expiration date. Upon any redemption of Common Units, the corresponding share of Class C common stock held by the reporting person is automatically forfeited and cancelled at the time of such redemption of the Common Unit."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Received in connection with the business combination (the \"Business Combination\") among System1, Inc., (f/k/a Trebia Acquisition Corp., (the \"Company\"), S1 Holdco, LLC (\"S1 Holdco\"), Orchid Merger Sub I, Inc. (\"Merger Sub I\"), Orchid Merger Sub II, Inc. (\"Merger Sub II\" and, together with Merger Sub I, the \"Merger Subs\"), System1 SS Protect Holdings, Inc. (\"Protected\") and the other parties signatory to that certain business combination agreement, dated as of June 28, 2021 (as amended November 30, 2021, January 10, 2022 and January 25, 2022)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The Common Units are redeemable (in connection with the surrender and forfeiture of the corresponding shares of Class C common stock (See Footnote 2 above)) on a one-for-one basis for shares of the Company's Class A Common Stock, or, at the election of the Company, cash equal to the volume weighted average market price of a share of Class A Common Stock at the time of such redemption. The Common Units have no expiration date. Upon any redemption of Common Units, the corresponding share of Class C common stock held by the reporting person is automatically forfeited and cancelled at the time of such redemption of the Common Unit."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The Common Units are redeemable (in connection with the surrender and forfeiture of the corresponding shares of Class C common stock (See Footnote 2 above)) on a one-for-one basis for shares of the Company's Class A Common Stock, or, at the election of the Company, cash equal to the volume weighted average market price of a share of Class A Common Stock at the time of such redemption. The Common Units have no expiration date. Upon any redemption of Common Units, the corresponding share of Class C common stock held by the reporting person is automatically forfeited and cancelled at the time of such redemption of the Common Unit."}],"balance_after":208595,"derivative":{"underlying":"Class A Common Stock","underlying_shares":208595},"source":{"system":"sec-edgar","filing":"0000899243-22-004267","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000089924322004267/doc4.xml","form_type":"4"}},{"id":2416940,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class C Common Stock","published_at":"2022-02-03T02:21:16.000Z","date":"2022-01-27","kind":"grant","acquired":true,"shares":208595,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"In connection with the Business Combination, one share of the Company's Class C common stock was issued for each Class B Unit (\"Common Unit\") in S1 Holdco, LLC (\"S1 Holdco\") held by the reporting person as of the closing of the Business Combination. Pursuant to the Fifth Amended and Restated Limited Liability Company Operating Agreement of S1 Holdco, in connection with the redemption of the Common Units (at the election of the holder), the corresponding shares of Class C common stock in the Company held by the reporting person are forfeited and cancelled, on a one-for-one basis, without consideration, for either shares of Class A Common Stock, or cash, at the Issuer's election."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Received in connection with the business combination (the \"Business Combination\") among System1, Inc., (f/k/a Trebia Acquisition Corp., (the \"Company\"), S1 Holdco, LLC (\"S1 Holdco\"), Orchid Merger Sub I, Inc. (\"Merger Sub I\"), Orchid Merger Sub II, Inc. (\"Merger Sub II\" and, together with Merger Sub I, the \"Merger Subs\"), System1 SS Protect Holdings, Inc. (\"Protected\") and the other parties signatory to that certain business combination agreement, dated as of June 28, 2021 (as amended November 30, 2021, January 10, 2022 and January 25, 2022)."}],"balance_after":208595,"source":{"system":"sec-edgar","filing":"0000899243-22-004267","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000089924322004267/doc4.xml","form_type":"4"}},{"id":2416939,"issuer":{"id":7602,"kind":"organization","name":"System1, Inc."},"owners":[{"id":29771,"kind":"person","name":"Sestanovich Elizabeth","position":1,"cik":"0001907093","reported_name":"Sestanovich Elizabeth","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief People Officer"}}],"security":"Class A Common Stock","published_at":"2022-02-03T02:21:16.000Z","date":"2022-01-27","kind":"grant","acquired":true,"shares":58841,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Received in connection with the business combination (the \"Business Combination\") among System1, Inc., (f/k/a Trebia Acquisition Corp., (the \"Company\"), S1 Holdco, LLC (\"S1 Holdco\"), Orchid Merger Sub I, Inc. (\"Merger Sub I\"), Orchid Merger Sub II, Inc. (\"Merger Sub II\" and, together with Merger Sub I, the \"Merger Subs\"), System1 SS Protect Holdings, Inc. (\"Protected\") and the other parties signatory to that certain business combination agreement, dated as of June 28, 2021 (as amended November 30, 2021, January 10, 2022 and January 25, 2022)."}],"balance_after":58841,"source":{"system":"sec-edgar","filing":"0000899243-22-004267","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1805833/000089924322004267/doc4.xml","form_type":"4"}}]}