System1, Inc. (SST) Institutional Ownership

Ownership Summary

System1, Inc. (NYSE:SST) appears in 23 institutional 13F filings for the quarter ending December 2025.

• They owned 10.1% of outstanding stock in December 2025, down from 41.6% the prior quarter.
• They decreased total shares held in SST by -75.36% quarter over quarter, and investors in System1 decreased 61.67% from a year ago.
• Among the 23 funds, 5 bought more System1 shares, 13 sold down, and 5 held their ground.
• Altogether, these fund groups held 815.64K shares in SST by December 2025, down by 2.5Mn shares quarter on quarter, and down 34.7Mn shares year over year.
• As of December 31, 2025, the biggest holder of System1 is Cannae Holdings, Inc. at 356.8K shares, representing 4.43% of shares outstanding.
• Leading buyers of System1 shares for the quarter ending December 2025 were VANGUARD CAPITAL MANAGEMENT LLC (37.13K), NINE MASTS CAPITAL Ltd (18.55K), GEODE CAPITAL MANAGEMENT, LLC (9.48K), VANGUARD FIDUCIARY TRUST CO (9.14K), Tower Research Capital LLC (TRC) (6.34K).
• Top sellers of SST stock for the quarter ending December 2025 included MILLENNIUM MANAGEMENT LLC (2.83K), GROUP ONE TRADING LLC (440), RENAISSANCE TECHNOLOGIES LLC (300), Royal Bank Of Canada (69), Bank Of America Corp /De/ (27).
• Business Quant data shows the 10 biggest positions in System1 as of December 2025 are held by Cannae Holdings, Inc. (356.8K), Bank Of America Corp /De/ (161.52K), Cerity Partners LLC (116.84K), VANGUARD CAPITAL MANAGEMENT LLC (37.13K), MILLENNIUM MANAGEMENT LLC (32.62K), BlackRock, Inc. (24.25K), GEODE CAPITAL MANAGEMENT, LLC (23.84K), NINE MASTS CAPITAL Ltd (18.55K), RENAISSANCE TECHNOLOGIES LLC (18.32K), State Street Corp (11.5K).