5 institutions reported holding $123,003 of C3IS INC (CISS) in SEC 13F filings for 2026-06-30. Largest institutional holders: TOWERVIEW LLC ($83,000), HRT FINANCIAL LP ($40,000), Caitong International Asset Management Co., Ltd ($3), SUMMIT SECURITIES GROUP LLC ($0), StoneX Group Inc. ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | TOWERVIEW LLC | $83,000 | 50,000 | New |
| 2 | HRT FINANCIAL LP | $40,000 | 24,459 | Trimmed |
| 3 | Caitong International Asset Management Co., Ltd | $3 | 2 | New |
| 4 | SUMMIT SECURITIES GROUP LLC | $0 | 0 | Exited |
| 5 | StoneX Group Inc. | $0 | 0 | Exited |
来源：SEC 13F 申报文件 · 截至 2026-06-30