System1, Inc.
SST- Exchange
- NYSE
- Industry
- Services-Computer Programming, Data Processing, Etc.
- SEC CIK
- 0001805833
No open-market purchases or sales by System1, Inc. insiders were filed in the last 90 days; 21 institutions reported holding it in 13F filings for Q2 2026, worth $1.38M in total; no superinvestor holds it.
Other share classesSSTPW
13F holders, Q1 2026
Institutional positions in System1, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 25
- +2 vs. Q4 2025
- Shares held
- 826.9K
- +58.1K (+7.6%) vs. Q4 2025
- Total value
- $2.50M
- −$514.6K (−17.1%) vs. Q4 2025
- New holders
- 6
- 4 more added
- Sold out
- 4
- 6 more reduced
1 institution that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting SST on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 21 | $1.38M |
| Q1 2026 | 25 | $2.50M |
| Q4 2025 | 24 | $3.20M |
| Q3 2025 | 30 | $22.5M |
| Q2 2025 | 36 | $17.9M |
| Q1 2025 | 55 | $13.2M |
| Q4 2024 | 59 | $31.6M |
| Q3 2024 | 60 | $39.1M |
| Q2 2024 | 60 | $53.0M |
| Q1 2024 | 47 | $69.4M |
| Q4 2023 | 49 | $76.8M |
| Q3 2023 | 48 | $41.6M |
| Q2 2023 | 44 | $154.8M |
| Q1 2023 | 34 | $138.1M |
| Q4 2022 | 30 | $133.5M |
| Q3 2022 | 38 | $182.2M |
| Q2 2022 | 37 | $193.0M |
| Q1 2022 | 31 | $421.1M |
| Q4 2021 | 1 | $9.79M |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding System1, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Cannae Holdings, Inc. | 356,797 | $1.08M | 4.39% | 00.0% | Unchanged |
| Bank of America Corp | 161,519 | $487.8K | 0.00% | −270.0% | Reduced |
| Cerity Partners LLC | 116,844 | $352.9K | 0.00% | 00.0% | Unchanged |
| Vanguard Capital Management LLC | 37,132 | $112.1K | 0.00% | +37,132 | New |
| Millennium Management LLC | 32,619 | $98.5K | 0.00% | −2,830−8.0% | Reduced |
| BlackRock, Inc. | 24,247 | $73.2K | 0.00% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 23,839 | $72.0K | 0.00% | +9,476+66.0% | Added |
| Nine Masts Capital Ltd | 18,548 | $56.0K | 0.01% | +18,548 | New |
| Renaissance Technologies LLC | 18,320 | $55.3K | 0.00% | −300−1.6% | Reduced |
| State Street Corp | 11,502 | $34.7K | 0.00% | 00.0% | Unchanged |
| Vanguard Fiduciary Trust Co | 9,141 | $27.6K | 0.00% | +9,141 | New |
| Tower Research Capital LLC (TRC) | 7,332 | $22.1K | 0.00% | +6,344+642.1% | Added |
| JPMorgan Chase & Co | 5,890 | $18.5K | 0.00% | +5,848+13,923.8% | Added |
| UBS Group AG | 1,324 | $4.00K | 0.00% | +907+217.5% | Added |
| Vanguard Global Advisers, LLC | 660 | $1.99K | 0.00% | +660 | New |
| UMA Financial Services, Inc. | 301 | $910 | 0.00% | +301 | New |
| Farther Finance Advisors, LLC | 150 | $783 | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 223 | $673 | 0.00% | −440−66.4% | Reduced |
| CWM, LLC | 114 | $344 | 0.00% | −1−0.9% | Reduced |
| Strategic Wealth Partners, Ltd. | 100 | $302 | 0.00% | 00.0% | Unchanged |
| SHP Wealth Management | 100 | $302 | 0.00% | +100 | New |
| BNP Paribas Arbitrage, SA | 86 | $260 | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 60 | $181 | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 35 | $105 | 0.00% | 00.0% | Unchanged |
| Royal Bank of Canada | 39 | $0 | 0.00% | −69−63.9% | Reduced |
| Citadel Advisors LLC | 0 | $0 | 0.00% | −12,759−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −12,376−100.0% | Sold out |
| FMR LLC | 0 | $0 | 0.00% | −1,105−100.0% | Sold out |
| Morgan Stanley | 0 | $0 | 0.00% | −439−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |