System1, Inc. (SST) Institutional Ownership

Ownership Summary

System1, Inc. (NYSE:SST) is held by 23 institutional investors per 13F filings through December 2025.

• These investors collectively held 10.1% of System1's outstanding shares in December 2025, down from 41.6% in September 2025.
• Their total shares held in SST decreased -75.36% quarter over quarter, and separately, investors owning 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.
• Cannae Holdings, Inc. leads ownership in SST with 356.8K shares as of December 31, 2025, equal to 4.43% of outstanding shares.
• The biggest buyers of System1 for the quarter ending December 2025 included 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).
• The largest sales of SST for the quarter ending December 2025 came from 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).
• According to Business Quant data, leading holders of SST for December 2025 are 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).