Who Owns C3IS INC (CISS)? -- Institutional Holders (2026-03-31)

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.

RankInstitutionValueSharesChange
1HRT FINANCIAL LP$63,00076,520New
2StoneX Group Inc.$8,62910,435New
3SUMMIT SECURITIES GROUP LLC$1,2471,508New
4WEXFORD CAPITAL LP$00Exited
5CITADEL ADVISORS LLC$00Exited
6L1 Global Manager Pty Ltd$00Exited
7Sassicaia Capital Advisers LLC$00Exited
8UBS Group AG$00Exited

Source: SEC Form 13F filings · as of 2026-03-31