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
Q1 2026 vs. Q4 2025
How the institutions holding System1, Inc. changed between Q4 2025 and Q1 2026.
All holders in Q1 2026All holders in Q4 2025
| Measure | Q4 2025 | Of which not filed for Q1 2026 | Q1 2026 | Change |
|---|---|---|---|---|
| Holders | 24 | 1 | 25 | +2 |
| Shares | 815.7K | 46.9K | 826.9K | +58.1K (+7.6%) |
| Value | $3.20M | $184.0K | $2.50M | −$514.6K (−17.1%) |
1 institution that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so the changes leave them out.
New holders (6)
Institutions that held System1, Inc. at the end of Q1 2026 but not at the end of Q4 2025.
| Institution | Shares | Value | % of portfolio |
|---|---|---|---|
| Vanguard Capital Management LLC | 37,132 | $112.1K | 0.00% |
| Nine Masts Capital Ltd | 18,548 | $56.0K | 0.01% |
| Vanguard Fiduciary Trust Co | 9,141 | $27.6K | 0.00% |
| Vanguard Global Advisers, LLC | 660 | $1.99K | 0.00% |
| UMA Financial Services, Inc. | 301 | $910 | 0.00% |
| SHP Wealth Management | 100 | $302 | 0.00% |
Sold out (4)
Institutions that held System1, Inc. at the end of Q4 2025 and filed for Q1 2026 without it.
| Institution | Shares, Q4 2025 | Value, Q4 2025 |
|---|---|---|
| Citadel Advisors LLC | 12,759 | $50.0K |
| XTX Topco Ltd | 12,376 | $48.5K |
| FMR LLC | 1,105 | $4.33K |
| Morgan Stanley | 439 | $1.72K |
Not filed for Q1 2026 yet (1)
Institutions that held System1, Inc. at the end of Q4 2025 and haven't filed a 13F for Q1 2026. Not filing isn't selling, so they aren't counted as sold out.
| Institution | Shares, Q4 2025 | Value, Q4 2025 |
|---|---|---|
| Vanguard Group Inc | 46,933 | $184.0K |