SYSTEM1SST
13F holders, Q4 2025 (December 31)At the end of Q4 2025, 24 institutions reported holding SYSTEM1 Inc. (SST) in their 13F filings, down 6 from Q3 2025. 0 opened new positions and 7 sold out. The largest holders were Cannae Holdings, Inc. ($1.4M), Bank of America Corp. ($633K) and Cerity Partners LLC ($458K). 3 famous investors held it, including Israel Englander (0.0% of Millennium Management's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- SYSTEM1 Inc.
- CUSIP
- 87200P208
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 0 | $0 |
| Exits | 7 | $257K |
All 13F filers, Q3 2025 → Q4 2025: 4,588 shares bought and 2,387,323 shares sold, net −2,382,735 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 24 holders
| Cannae Holdings, Inc. | 1.74% | Reduce -86.8% | 356,797 | $1.4M |
| Bank of America Corp. | 0.00% | Reduce -0.0% | 161,546 | $633K |
| Cerity Partners LLC | 0.00% | Reduce -0.0% | 116,844 | $458K |
| Vanguard Group Inc. | 0.00% | No change | 46,933 | $184K |
| Millennium Management | 0.00% | Reduce -8.1% | 35,449 | $139K |
| BlackRock, Inc. | 0.00% | Add +0.1% | 24,247 | $95K |
| Renaissance Technologies | 0.00% | Add +8.8% | 18,620 | $73K |
| Geode Capital Management, LLC | 0.00% | Reduce -0.1% | 14,363 | $56K |
| Citadel Advisors | 0.00% | Add +26.9% | 12,759 | $50K |
| XTX Topco Ltd | 0.00% | Reduce -1.0% | 12,376 | $49K |
| State Street Corp. | 0.00% | No change | 11,502 | $45K |
| FMR LLC | 0.00% | Reduce -42.5% | 1,105 | $4K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +54.4% | 988 | $4K |
| Group One Trading LLC | 0.00% | Reduce -8.0% | 663 | $3K |
| Morgan Stanley | 0.00% | Reduce -59.9% | 439 | $2K |
| UBS Group AG | 0.00% | Reduce -4.4% | 417 | $2K |
| Farther Finance Advisors, LLC | 0.00% | No change | 150 | $588 |
| Strategic Wealth Partners, Ltd. | 0.00% | No change | 100 | $392 |
| BNP Paribas Financial Markets | 0.00% | Reduce -29.5% | 86 | $337 |
| SBI Securities Co., Ltd. | 0.00% | No change | 60 | $235 |
| JPMorgan Chase & Co. | 0.00% | Reduce -6.7% | 42 | $165 |
| Osaic Holdings, Inc. | 0.00% | No change | 35 | $137 |
| Royal Bank of Canada | 0.00% | Reduce -92.3% | 108 | $0 |
| Cwm, LLC | 0.00% | Reduce -10.2% | 115 | $0 |
"% of holder's portfolio" is SST's weight in each manager's 13F, not the share of SYSTEM1 Inc. the manager owns.