System1, Inc. - SST
Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 1 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cannae Holdings, Inc. | History | Reduced | 356,797 | 1,398 | 1.74% | 10.04% | 1 | -2,344,482 | -86.79% | Q4 2025 | Jan 06, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Reduced | 161,546 | 633 | 0.0% | 0.0% | 2 | -24 | -0.01% | Q4 2025 | Feb 17, 2026 |
| Cerity Partners LLC | History | Reduced | 116,844 | 458 | 0.0% | 0.0% | 3 | -23 | -0.02% | Q4 2025 | Feb 11, 2026 |
| VANGUARD GROUP INC | History | No change | 46,933 | 183 | 0.0% | 0.0% | 4 | 0 | 0.0% | Q4 2025 | Jan 29, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Reduced | 35,449 | 138 | 0.0% | 0.0% | 5 | -3,112 | -8.07% | Q4 2025 | Feb 17, 2026 |
| BlackRock, Inc. | History | Added to | 24,247 | 95 | 0.0% | 0.0% | 6 | +37 | 0.15% | Q4 2025 | Feb 12, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Added to | 18,620 | 72 | 0.0% | 0.0% | 7 | +1,500 | 8.76% | Q4 2025 | Feb 12, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Reduced | 14,363 | 56 | 0.0% | 0.0% | 8 | -18 | -0.13% | Q4 2025 | Feb 09, 2026 |
| CITADEL ADVISORS LLC | History | Added to | 12,759 | 50 | 0.0% | 0.0% | 9 | +2,703 | 26.88% | Q4 2025 | Feb 17, 2026 |
| XTX Topco Ltd | History | Reduced | 12,376 | 48 | 0.0% | 0.0% | 10 | -128 | -1.02% | Q4 2025 | Feb 17, 2026 |
| STATE STREET CORP | History | No change | 11,502 | 45 | 0.0% | 0.0% | 11 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| FMR LLC | History | Reduced | 1,105 | 4 | 0.0% | 0.0% | 12 | -815 | -42.45% | Q4 2025 | Feb 17, 2026 |
| Tower Research Capital LLC (TRC) | History | Added to | 988 | 3 | 0.0% | 0.0% | 13 | +348 | 54.37% | Q4 2025 | Feb 17, 2026 |
| GROUP ONE TRADING LLC | History | Reduced | 663 | 2 | 0.0% | 0.0% | 14 | -58 | -8.04% | Q4 2025 | Feb 12, 2026 |
| MORGAN STANLEY | History | Reduced | 439 | 1 | 0.0% | 0.0% | 15 | -656 | -59.91% | Q4 2025 | Feb 13, 2026 |
| UBS Group AG | History | Reduced | 417 | 1 | 0.0% | 0.0% | 16 | -19 | -4.36% | Q4 2025 | Jan 29, 2026 |
| MARSHALL WACE, LLP | History | Closed out | 0 | 0 | — | 0.0% | — | -36,271 | -100.0% | Q3 2025 | Nov 13, 2025 |
| West Branch Capital LLC | History | Closed out | 0 | 0 | — | — | — | -115 | -100.0% | Q3 2025 | Oct 21, 2025 |
| ROYAL BANK OF CANADA | History | New | 108 | 0 | — | — | — | +108 | New | Q4 2025 | Feb 17, 2026 |
| BARCLAYS PLC | History | Closed out | 0 | 0 | — | — | — | -86 | -100.0% | Q3 2025 | Mar 31, 2026 |
| GAMMA Investing LLC | History | Closed out | 0 | 0 | — | — | — | -76 | -100.0% | Q3 2025 | Oct 02, 2025 |
| NISA INVESTMENT ADVISORS, LLC | History | Closed out | 0 | 0 | — | — | — | -64 | -100.0% | Q3 2025 | Oct 23, 2025 |
| CITIGROUP INC | History | Closed out | 0 | 0 | — | — | — | -38 | -100.0% | Q3 2025 | Nov 10, 2025 |
| BNP PARIBAS FINANCIAL MARKETS | History | Reduced | 86 | 0 | — | — | — | -36 | -29.51% | Q4 2025 | Feb 10, 2026 |
| CWM, LLC | History | Reduced | 115 | 0 | — | 0.0% | — | -13 | -10.16% | Q4 2025 | Jan 26, 2026 |
| JPMORGAN CHASE & CO | History | Reduced | 42 | 0 | — | — | — | -3 | -6.67% | Q4 2025 | Feb 11, 2026 |
| OSAIC HOLDINGS, INC. | History | No change | 35 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| SBI Securities Co., Ltd. | History | No change | 60 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 03, 2026 |
| Farther Finance Advisors, LLC | History | No change | 150 | 0 | — | 0.0% | — | 0 | 0.0% | Q4 2025 | Jan 23, 2026 |