System1, Inc. (SST) Institutional Ownership

Ownership Summary

System1, Inc. (NYSE:SST) has 23 institutional investors with active 13F positions as of December 2025.

• Collectively, these holders controlled 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.
• During the quarter, 5 of these 23 funds increased positions in SST, 13 reduced exposure, and 5 held steady.
• Combined, these investors held 815.64K shares in SST for December 2025, down by 2.5Mn shares quarter on quarter, and down 34.7Mn shares year over year.
• Cannae Holdings, Inc. holds the largest position in SST at 356.8K shares as of December 31, 2025, or 4.43% of shares outstanding.
• Top purchasers of SST stock 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).
• 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).
• System1's 10 largest shareholders as of December 2025 include 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) per Business Quant data.