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
Q3 2025 vs. Q2 2025
How the institutions holding System1, Inc. changed between Q2 2025 and Q3 2025.
All holders in Q3 2025All holders in Q2 2025
| Measure | Q2 2025 | Q3 2025 | Change |
|---|---|---|---|
| Holders | 36 | 30 | −6 |
| Shares | 3.24M | 3.20M | −43.8K (−1.4%) |
| Value | $17.9M | $22.5M | +$4.59M (+25.6%) |
New holders (3)
Institutions that held System1, Inc. at the end of Q3 2025 but not at the end of Q2 2025.
| Institution | Shares | Value | % of portfolio |
|---|---|---|---|
| Marshall Wace, LLP | 36,271 | $255.3K | 0.00% |
| XTX Topco Ltd | 12,504 | $88.0K | 0.00% |
| Citadel Advisors LLC | 10,056 | $70.8K | 0.00% |
Sold out (9)
Institutions that held System1, Inc. at the end of Q2 2025 and filed for Q3 2025 without it.
| Institution | Shares, Q2 2025 | Value, Q2 2025 |
|---|---|---|
| Jane Street Group, LLC | 31,681 | $175.2K |
| Susquehanna International Group, LLP | 12,374 | $68.4K |
| HRT Financial LP | 11,870 | $65.0K |
| Clear Street Markets LLC | 1,849 | $10.2K |
| Wells Fargo & Company | 891 | $4.93K |
| Russell Investments Group, Ltd. | 17 | $94 |
| EverSource Wealth Advisors, LLC | 11 | $61 |
| Rhumbline Advisers | 0 | $9 |
| Essential Partners LLC | 1 | $6 |