2 institutions reported holding $6,174 of ACTINIUM PHARMACEUTICALS INC (ATNRW) in SEC 13F filings for 2026-06-30. Largest institutional holders: GROUP ONE TRADING LLC ($3,626), SIMPLEX TRADING, LLC ($2,548). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GROUP ONE TRADING LLC | $3,626 | 3,700 | Added |
| 2 | SIMPLEX TRADING, LLC | $2,548 | 2,600 | Trimmed |
Source: SEC Form 13F filings · as of 2026-06-30