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, Q3 2025
Institutional positions in System1, Inc. as of Sep 30, 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
- 30
- −6 vs. Q2 2025
- Shares held
- 3.20M
- −43.8K (−1.4%) vs. Q2 2025
- Total value
- $22.5M
- +$4.59M (+25.6%) vs. Q2 2025
- New holders
- 3
- 5 more added
- Sold out
- 9
- 14 more reduced
Compare with Q2 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, Q3 2025
Shares, value and share of portfolio for each institution holding System1, Inc.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| West Branch Capital LLC | 115 | $51 | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 35 | $255 | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 38 | $267 | 0.00% | +1+2.7% | Added |
| JPMorgan Chase & Co | 45 | $317 | 0.00% | −96−68.1% | Reduced |
| SBI Securities Co., Ltd. | 60 | $422 | 0.00% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 64 | $451 | 0.00% | 00.0% | Unchanged |
| GAMMA Investing LLC | 76 | $535 | 0.00% | +40+111.1% | Added |
| Barclays PLC | 86 | $605 | 0.00% | −104−54.7% | Reduced |
| Strategic Wealth Partners, Ltd. | 100 | $704 | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 122 | $859 | 0.00% | −4,389−97.3% | Reduced |
| CWM, LLC | 128 | $1.00K | 0.00% | −110−46.2% | Reduced |
| Farther Finance Advisors, LLC | 150 | $1.06K | 0.00% | 00.0% | Unchanged |
| UBS Group AG | 436 | $3.07K | 0.00% | −10,213−95.9% | Reduced |
| Tower Research Capital LLC (TRC) | 640 | $4.51K | 0.00% | −1,940−75.2% | Reduced |
| Group One Trading, L.P. | 721 | $5.08K | 0.00% | −1,353−65.2% | Reduced |
| Morgan Stanley | 1,095 | $7.71K | 0.00% | −264−19.4% | Reduced |
| Royal Bank of Canada | 1,394 | $10.0K | 0.00% | +1,143+455.4% | Added |
| FMR LLC | 1,920 | $13.5K | 0.00% | −3−0.2% | Reduced |
| Citadel Advisors LLC | 10,056 | $70.8K | 0.00% | +10,056 | New |
| State Street Corp | 11,502 | $81.0K | 0.00% | 00.0% | Unchanged |
| XTX Topco Ltd | 12,504 | $88.0K | 0.00% | +12,504 | New |
| Geode Capital Management, LLC | 14,381 | $101.3K | 0.00% | −7,149−33.2% | Reduced |
| Renaissance Technologies LLC | 17,120 | $120.5K | 0.00% | +5,100+42.4% | Added |
| BlackRock, Inc. | 24,210 | $170.4K | 0.00% | −14,912−38.1% | Reduced |
| Marshall Wace, LLP | 36,271 | $255.3K | 0.00% | +36,271 | New |
| Millennium Management LLC | 38,561 | $271.5K | 0.00% | −4,217−9.9% | Reduced |
| Vanguard Group Inc | 46,933 | $330.4K | 0.00% | −373−0.8% | Reduced |
| Cerity Partners LLC | 116,867 | $822.7K | 0.00% | +7,581+6.9% | Added |
| Bank of America Corp | 161,570 | $1.14M | 0.00% | −12,719−7.3% | Reduced |
| Cannae Holdings, Inc. | 2,701,279 | $19.0M | 10.04% | 00.0% | Unchanged |
| Rhumbline Advisers | 0 | $0 | 0.00% | 0 | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −31,681−100.0% | Sold out |
| Susquehanna International Group, LLP | 0 | $0 | 0.00% | −12,374−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −11,870−100.0% | Sold out |
| Clear Street Markets LLC | 0 | $0 | 0.00% | −1,849−100.0% | Sold out |
| Wells Fargo & Company | 0 | $0 | 0.00% | −891−100.0% | Sold out |
| Russell Investments Group, Ltd. | 0 | $0 | 0.00% | −17−100.0% | Sold out |
| EverSource Wealth Advisors, LLC | 0 | $0 | 0.00% | −11−100.0% | Sold out |
| Essential Partners LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |