SYSTEM1SST
13F holders, Q3 2025 (September 30)At the end of Q3 2025, 30 institutions reported holding SYSTEM1 Inc. (SST) in their 13F filings, down 5 from Q2 2025. 3 opened new positions and 8 sold out. The largest holders were Cannae Holdings, Inc. ($19.0M), Bank of America Corp. ($1.1M) and Cerity Partners LLC ($823K). 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 Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 3 | $414K |
| Exits | 8 | $324K |
All 13F filers, Q2 2025 → Q3 2025: 72,696 shares bought and 116,536 shares sold, net −43,840 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 30 holders
| Cannae Holdings, Inc. | 10.04% | No change | 2,701,279 | $19.0M |
| Bank of America Corp. | 0.00% | Reduce -7.3% | 161,570 | $1.1M |
| Cerity Partners LLC | 0.00% | Add +6.9% | 116,867 | $823K |
| Vanguard Group Inc. | 0.00% | Reduce -0.8% | 46,933 | $330K |
| Millennium Management | 0.00% | Reduce -9.9% | 38,561 | $271K |
| Marshall Wace, LLP | 0.00% | New | 36,271 | $255K |
| BlackRock, Inc. | 0.00% | Reduce -38.1% | 24,210 | $170K |
| Renaissance Technologies | 0.00% | Add +42.4% | 17,120 | $121K |
| Geode Capital Management, LLC | 0.00% | Reduce -33.2% | 14,381 | $101K |
| XTX Topco Ltd | 0.00% | New | 12,504 | $88K |
| State Street Corp. | 0.00% | No change | 11,502 | $81K |
| Citadel Advisors | 0.00% | New | 10,056 | $71K |
| FMR LLC | 0.00% | Reduce -0.2% | 1,920 | $14K |
| Royal Bank of Canada | 0.00% | Add +455.4% | 1,394 | $10K |
| Morgan Stanley | 0.00% | Reduce -19.4% | 1,095 | $8K |
| Group One Trading LLC | 0.00% | Reduce -65.2% | 721 | $5K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -75.2% | 640 | $5K |
| UBS Group AG | 0.00% | Reduce -95.9% | 436 | $3K |
| Farther Finance Advisors, LLC | 0.00% | No change | 150 | $1K |
| Cwm, LLC | 0.00% | Reduce -46.2% | 128 | $1K |
| BNP Paribas Financial Markets | 0.00% | Reduce -97.3% | 122 | $859 |
| Strategic Wealth Partners, Ltd. | 0.00% | No change | 100 | $704 |
| Barclays PLC | 0.00% | Reduce -54.7% | 86 | $605 |
| GAMMA Investing LLC | 0.00% | Add +111.1% | 76 | $535 |
| Nisa Investment Advisors, LLC | 0.00% | No change | 64 | $451 |
| SBI Securities Co., Ltd. | 0.00% | No change | 60 | $422 |
| JPMorgan Chase & Co. | 0.00% | Reduce -68.1% | 45 | $317 |
| Citigroup Inc. | 0.00% | Add +2.7% | 38 | $267 |
| Osaic Holdings, Inc. | 0.00% | No change | 35 | $255 |
| West Branch Capital LLC | 0.00% | No change | 115 | $51 |
"% of holder's portfolio" is SST's weight in each manager's 13F, not the share of SYSTEM1 Inc. the manager owns.