Welcome to our dedicated page for System1 SEC filings (Ticker: SST), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
System1, Inc. filings document the company’s operating results, supplemental financial information and material corporate events as a public customer acquisition marketing platform. Recent Form 8-K disclosures include quarterly and annual financial-result releases, Regulation FD exhibits, investor presentations, and reconciliations for non-GAAP measures such as adjusted gross profit and adjusted EBITDA.
The filing record also covers governance and capital-structure matters, including director changes, ownership-related transactions involving Class A common stock, and NYSE continued-listing compliance disclosures. These filings provide formal records of System1’s reported financial performance, board composition, securities matters and exchange-status communications.
System1, Inc. (SST) furnished an 8-K under Item 2.02 announcing financial results for the quarter ended September 30, 2025. The company issued a press release, attached as Exhibit 99.1, which includes details of the quarter’s performance.
The Item 2.02 information, including Exhibit 99.1, is furnished and not deemed “filed” under the Exchange Act. The press release references certain non-GAAP financial measures, with reconciliations to GAAP and explanations of their use included in the release.
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.
CEE Holdings Trust, a reporting person identified as a director of System1, Inc. (SST), purchased 11,015 shares of Class A common stock on 08/22/2025 at a weighted-average price of $7.32 per share. After the transaction the trust beneficially owned 919,555 shares. The filing states the purchase occurred in multiple trades at prices ranging from $6.79 to $7.50, and the trustee who signed the Form 4 is Brittany Gale of Jackson Hole Trust Company. This disclosure reports an insider acquisition by a director and provides the mandatory details required under Section 16.