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, Q4 2025
Institutional positions in System1, Inc. as of Dec 31, 2025. 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
- 24
- −6 vs. Q3 2025
- Shares held
- 815.7K
- −2.38M (−74.5%) vs. Q3 2025
- Total value
- $3.20M
- −$19.3M (−85.8%) vs. Q3 2025
- New holders
- 0
- 4 more added
- Sold out
- 6
- 14 more reduced
Compare with Q3 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, Q4 2025
Shares, value and share of portfolio for each institution holding System1, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Cannae Holdings, Inc. | 356,797 | $1.40M | 1.74% | −2,344,482−86.8% | Reduced |
| Bank of America Corp | 161,546 | $633.3K | 0.00% | −240.0% | Reduced |
| Cerity Partners LLC | 116,844 | $458.0K | 0.00% | −230.0% | Reduced |
| Vanguard Group Inc | 46,933 | $184.0K | 0.00% | 00.0% | Unchanged |
| Millennium Management LLC | 35,449 | $139.0K | 0.00% | −3,112−8.1% | Reduced |
| BlackRock, Inc. | 24,247 | $95.0K | 0.00% | +37+0.2% | Added |
| Renaissance Technologies LLC | 18,620 | $73.0K | 0.00% | +1,500+8.8% | Added |
| Geode Capital Management, LLC | 14,363 | $56.3K | 0.00% | −18−0.1% | Reduced |
| Citadel Advisors LLC | 12,759 | $50.0K | 0.00% | +2,703+26.9% | Added |
| XTX Topco Ltd | 12,376 | $48.5K | 0.00% | −128−1.0% | Reduced |
| State Street Corp | 11,502 | $45.1K | 0.00% | 00.0% | Unchanged |
| FMR LLC | 1,105 | $4.33K | 0.00% | −815−42.4% | Reduced |
| Tower Research Capital LLC (TRC) | 988 | $3.87K | 0.00% | +348+54.4% | Added |
| Group One Trading, L.P. | 663 | $2.60K | 0.00% | −58−8.0% | Reduced |
| Morgan Stanley | 439 | $1.72K | 0.00% | −656−59.9% | Reduced |
| UBS Group AG | 417 | $1.64K | 0.00% | −19−4.4% | Reduced |
| Farther Finance Advisors, LLC | 150 | $588 | 0.00% | 00.0% | Unchanged |
| Strategic Wealth Partners, Ltd. | 100 | $392 | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 86 | $337 | 0.00% | −36−29.5% | Reduced |
| SBI Securities Co., Ltd. | 60 | $235 | 0.00% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 42 | $165 | 0.00% | −3−6.7% | Reduced |
| Advisor Group Holdings, Inc. | 35 | $137 | 0.00% | 00.0% | Unchanged |
| Royal Bank of Canada | 108 | $0 | 0.00% | −1,286−92.3% | Reduced |
| CWM, LLC | 115 | $0 | 0.00% | −13−10.2% | Reduced |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −36,271−100.0% | Sold out |
| Barclays PLC | 0 | $0 | 0.00% | −86−100.0% | Sold out |
| GAMMA Investing LLC | 0 | $0 | 0.00% | −76−100.0% | Sold out |
| Nisa Investment Advisors, LLC | 0 | $0 | 0.00% | −64−100.0% | Sold out |
| Citigroup Inc | 0 | $0 | 0.00% | −38−100.0% | Sold out |
| West Branch Capital LLC | 0 | $0 | 0.00% | −115−100.0% | Sold out |