8 institutions reported holding $72,876 of C3IS INC (CISS) in SEC 13F filings for 2026-03-31. Largest institutional holders: HRT FINANCIAL LP ($63,000), StoneX Group Inc. ($8,629), SUMMIT SECURITIES GROUP LLC ($1,247), WEXFORD CAPITAL LP ($0), CITADEL ADVISORS LLC ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | HRT FINANCIAL LP | $63,000 | 76,520 | New |
| 2 | StoneX Group Inc. | $8,629 | 10,435 | New |
| 3 | SUMMIT SECURITIES GROUP LLC | $1,247 | 1,508 | New |
| 4 | WEXFORD CAPITAL LP | $0 | 0 | Exited |
| 5 | CITADEL ADVISORS LLC | $0 | 0 | Exited |
| 6 | L1 Global Manager Pty Ltd | $0 | 0 | Exited |
| 7 | Sassicaia Capital Advisers LLC | $0 | 0 | Exited |
| 8 | UBS Group AG | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31