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
Q4 2025 vs. Q3 2025
How the institutions holding System1, Inc. changed between Q3 2025 and Q4 2025.
All holders in Q4 2025All holders in Q3 2025
| Measure | Q3 2025 | Q4 2025 | Change |
|---|---|---|---|
| Holders | 30 | 24 | −6 |
| Shares | 3.20M | 815.7K | −2.38M (−74.5%) |
| Value | $22.5M | $3.20M | −$19.3M (−85.8%) |
New holders (0)
Institutions that held System1, Inc. at the end of Q4 2025 but not at the end of Q3 2025.
None.
Sold out (6)
Institutions that held System1, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.
| Institution | Shares, Q3 2025 | Value, Q3 2025 |
|---|---|---|
| Marshall Wace, LLP | 36,271 | $255.3K |
| Barclays PLC | 86 | $605 |
| GAMMA Investing LLC | 76 | $535 |
| Nisa Investment Advisors, LLC | 64 | $451 |
| Citigroup Inc | 38 | $267 |
| West Branch Capital LLC | 115 | $51 |