Every Form 4 that System1, Inc. (SST) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow SST and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full SST filings page.
System1, Inc. reported that Chief People Officer Elizabeth Sestanovich had 7,058 shares of Class A common stock withheld on July 15, 2026 to satisfy tax obligations on the vesting of 13,870 restricted stock units (RSUs). After this tax-withholding disposition, she directly held 51,890 shares, including 28,140 unvested RSUs.
System1, Inc. executive Brian Coppola, Chief Ad Operations Officer, reported a tax-withholding disposition of 6,124 shares of Class A Common Stock at $2.60 per share. The shares were withheld upon the vesting of 13,954 RSUs. After this event, he holds 59,774 shares directly, including 28,308 unvested RSUs.
System1, Inc. Chief Financial Officer Kidambi Tridivesh reported a tax-withholding disposition of 6,022 shares of Class A Common Stock on July 15, 2026, at $2.60 per share. The company withheld these shares to cover taxes on the vesting of 17,338 RSUs. After this event, Tridivesh directly holds 175,793 shares, including 35,176 unvested RSUs.
System1, Inc. reported an insider equity event for General Counsel & Secretary Daniel J. Weinrot. Upon vesting of 17,995 restricted stock units (RSUs), the company withheld 9,156 shares of Class A Common Stock at $2.60 per share to satisfy his tax withholding obligation.
After this non-market tax-withholding disposition, Weinrot directly holds 59,897 shares of Class A Common Stock, which includes 36,515 unvested RSUs. No open-market purchase or sale of shares occurred as part of this transaction.
Kidambi Tridivesh reported acquisition or exercise transactions in this Form 4 filing.
System1, Inc. reported that Chief Financial Officer Tridivesh Kidambi received a grant of 35,300 restricted stock units, each equal to one share of Class A Common Stock. The award was fully vested on the grant date, increasing his direct holdings to 181,815 shares. This total includes 52,514 unvested RSUs that remain subject to vesting conditions.
System1, Inc. Chief Financial Officer Kidambi Tridivesh purchased 26,910 shares of Class A Common Stock at $3.00 per share. The shares were bought in a privately negotiated, arm’s length transaction from another existing holder, rather than through the stock exchange.
Separately, upon vesting of 838 restricted stock units, the company withheld 301 shares at $2.26 per share to satisfy his tax withholding obligation, which is a routine non-market disposition. After these transactions, he directly holds 146,515 shares, including 52,514 unvested RSUs.
System1, Inc. Chief People Officer Elizabeth Sestanovich reported a routine tax-related share disposition tied to restricted stock units. When 670 RSUs vested, the company withheld 341 shares of Class A Common Stock at $2.26 per share to cover tax obligations, rather than selling shares on the open market.
After this withholding, Sestanovich directly holds 58,948 shares of Class A Common Stock, including 42,010 unvested RSUs. This event reflects standard equity compensation and tax withholding mechanics, not a discretionary buy or sell decision.
System1, Inc. Chief Ad Operations Officer Brian Coppola reported a routine tax-related share disposition linked to restricted stock vesting. When 754 restricted stock units vested, the company withheld 331 shares of Class A Common Stock, valued at $2.26 per share, to satisfy tax withholding obligations. Following this non-market transaction, Coppola directly holds 65,898 shares of Class A Common Stock, and his position also includes 42,262 unvested RSUs.
System1, Inc. General Counsel & Secretary Daniel J. Weinrot reported a routine tax-related share disposition. When 670 restricted stock units (RSUs) vested, the company withheld 341 shares of Class A Common Stock at $2.26 per share to cover his tax withholding obligation.
After this non-market transaction, Weinrot directly holds 69,053 shares of Class A Common Stock, which include 54,510 unvested RSUs. The filing reflects compensation-related equity vesting rather than an open-market purchase or sale.
System1, Inc. Chief Financial Officer Form 4 filing shows a routine share withholding tied to equity compensation. On 01/28/2026, 258 shares of Class A Common Stock were withheld at $4.18 per share to cover taxes on the vesting of 625 restricted stock units.
After this transaction, the CFO beneficially owns 119,906 shares of Class A Common Stock, which includes 53,352 unvested RSUs. This reflects standard tax settlement mechanics rather than an open‑market sale.
System1, Inc. reported an insider transaction by Chief People Officer Elizabeth Sestanovich. When 375 previously granted restricted stock units vested, the company withheld 211 shares of Class A Common Stock at $4.18 per share to cover her tax withholding obligation. After this tax-related share withholding, she beneficially owns 59,289 shares, which include 42,680 unvested RSUs.
System1, Inc. Chief Ad Operations Officer Brian Coppola reported a small share withholding tied to restricted stock units. On 01/28/2026, 231 shares of Class A common stock were withheld at $4.18 per share to cover taxes upon vesting of 469 RSUs. After this, he beneficially owned 66,229 shares, including 43,016 unvested RSUs, all held directly.
System1, Inc. officer Daniel J. Weinrot, General Counsel & Secretary, reported an automatic share withholding tied to equity compensation. On January 28, 2026, upon vesting of 375 restricted stock units (RSUs), the company withheld 211 shares of Class A common stock at $4.18 per share to cover tax obligations.
After this tax withholding, Weinrot beneficially owned 69,394 shares of Class A common stock in total, which the disclosure states includes 55,180 unvested RSUs. The filing characterizes the transaction with code F, indicating shares withheld for taxes rather than an open‑market sale.
System1, Inc. reported an insider equity transaction by its Chief Financial Officer, Tridivesh Kidambi. On 01/15/2026, 837 previously granted restricted stock units (RSUs) vested, and the company withheld 345 shares of Class A common stock at a price of $4.40 per share to cover the CFO's tax withholding obligation related to this vesting. This withholding is coded as an "F" transaction, indicating a tax-related share disposition rather than an open-market trade.
After this event, the CFO beneficially owned 120,164 shares of System1 Class A common stock on a direct basis, which includes 53,977 unvested RSUs that remain subject to future vesting conditions.
System1, Inc.'s Chief People Officer Elizabeth Sestanovich reported an automatic share withholding tied to restricted stock vesting. On 01/15/2026, 670 previously granted restricted stock units vested, and the company withheld 377 shares of Class A common stock at $4.40 per share to cover her tax withholding obligation rather than conducting an open-market sale. After this transaction, she beneficially owned 59,500 shares of Class A common stock, which includes 43,055 unvested restricted stock units. This reflects routine equity award administration rather than a discretionary stock sale.
System1, Inc. reported an insider equity transaction by Chief Ad Operations Officer Brian Coppola. On 01/15/2026, 371 shares of Class A Common Stock were withheld at $4.40 per share to satisfy tax withholding obligations triggered by the vesting of 754 previously granted restricted stock units (RSUs). This was reported as a code "F" transaction, indicating a tax-related withholding rather than an open-market sale.
After this transaction, Coppola beneficially owned 66,460 shares of System1 Class A Common Stock, which includes 43,485 unvested RSUs. The filing reflects routine equity compensation and associated tax withholding for a company officer.
System1, Inc. officer Daniel J. Weinrot, General Counsel & Secretary, reported a tax-related share withholding tied to restricted stock unit (RSU) vesting. On January 15, 2026, 377 shares of Class A common stock were withheld by the company at a price of $4.40 per share to cover his tax obligation when 670 RSUs vested. After this transaction, he beneficially owns 69,605 shares of Class A common stock, which includes 55,555 unvested RSUs. The filing is made as a Form 4 for a single reporting person.
System1, Inc. (SST) reported an insider transaction by its Chief Financial Officer, Tridivesh Kidambi. On 10/28/2025, the company withheld 263 shares of Class A common stock at $6.18 per share to satisfy taxes due upon the vesting of 625 RSUs previously granted to the officer (transaction code F).
Following the withholding, the officer beneficially owned 120,509 shares, which includes 54,814 unvested RSUs. This filing reflects administrative tax withholding rather than an open-market sale.
System1, Inc. (SST) reported an insider tax withholding transaction. A Form 4 shows Chief People Officer Elizabeth Sestanovich had 158 shares of Class A Common Stock withheld at $6.18 on 10/28/2025 (transaction code F) to cover taxes on the vesting of previously granted RSUs.
The filing notes the vesting of 375 RSUs, with the company withholding shares to satisfy tax obligations. Following the transaction, Sestanovich beneficially owns 59,877 shares directly, which includes 43,725 unvested RSUs.
System1, Inc. (SST) reported an insider equity transaction tied to restricted stock vesting. On 10/28/2025, the issuer withheld 235 shares of Class A Common Stock at $6.18 per share (Transaction Code F) to satisfy the reporting person’s tax withholding obligation upon vesting of previously granted RSUs. Following this tax withholding, the reporting person beneficially owns 66,831 shares.
The holdings include 44,239 unvested RSUs. The reporting person is an officer of the company (Chief Ad Operations Officer).
System1, Inc. (SST) reported by officer Daniel J. Weinrot (General Counsel & Secretary) a routine tax-withholding transaction on 10/28/2025. A total of 214 shares of Class A common stock were withheld and disposed of at $6.18 per share under code F to satisfy taxes upon vesting of previously granted RSUs.
Following the transaction, the reporting person beneficially owned 69,982 shares, which includes 56,225 unvested RSUs. The filing was made as a single reporting person submission.
System1, Inc. (SST) filed a Form 4 reporting an automatic share withholding tied to equity compensation. On 10/15/2025, Chief Ad Operations Officer Brian Coppola had 377 shares of Class A common stock withheld at $7.94 per share (code F) to cover taxes upon the vesting of 754 RSUs.
Following the transaction, Coppola beneficially owned 67,066 shares in total, which includes 44,708 unvested RSUs. The filing reflects a non‑open market, tax‑withholding event rather than a discretionary purchase or sale.
System1, Inc. (SST) reported insider activity by its Chief Financial Officer, Tridivesh Kidambi. A Form 4 shows an F-coded transaction on 10/15/2025 where 352 shares of Class A common stock were withheld at $7.94 per share to satisfy tax obligations tied to the vesting of 837 RSUs.
Following this event, the reporting person beneficially owns 120,772 shares. This figure includes 55,439 unvested RSUs as noted in the footnotes.
System1, Inc. (SST) reported an insider transaction by Chief People Officer Elizabeth Sestanovich. On 10/15/2025, 282 shares of Class A Common Stock were withheld at $7.94 per share to satisfy tax obligations upon the vesting of 670 RSUs, coded “F” (tax withholding).
Following the transaction, she beneficially owned 60,035 shares directly. This figure includes 44,100 unvested RSUs, as noted in the footnotes.
System1, Inc. (SST) reported an insider equity transaction by its General Counsel & Secretary, Daniel J. Weinrot. On 10/15/2025, 670 restricted stock units vested, and the company withheld 382 shares at $7.94 under code F to cover tax withholding.
Following the transaction, the reporting person beneficially owned 70,196 shares. This figure includes 56,600 unvested RSUs, reflecting both vested holdings and remaining unvested awards.