68 institutions reported holding $5.4M of ACTINIUM PHARMACEUTICALS INC (ATNM) in SEC 13F filings for 2026-03-31. Largest institutional holders: VANGUARD CAPITAL MANAGEMENT LLC ($1.2M), ACADIAN ASSET MANAGEMENT LLC ($596,000), MILLENNIUM MANAGEMENT LLC ($561,946), RENAISSANCE TECHNOLOGIES LLC ($469,383), BlackRock, Inc. ($369,466). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT LLC | $1.2M | 1.3M | New |
| 2 | ACADIAN ASSET MANAGEMENT LLC | $596,000 | 600,819 | Trimmed |
| 3 | MILLENNIUM MANAGEMENT LLC | $561,946 | 564,600 | Trimmed |
| 4 | RENAISSANCE TECHNOLOGIES LLC | $469,383 | 471,600 | Added |
| 5 | BlackRock, Inc. | $369,466 | 371,210 | Added |
| 6 | TWO SIGMA INVESTMENTS, LP | $335,583 | 337,168 | Added |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $334,594 | 336,073 | Added |
| 8 | GAGNON SECURITIES LLC | $200,354 | 201,300 | Trimmed |
| 9 | VANGUARD FIDUCIARY TRUST CO | $159,464 | 160,265 | New |
| 10 | STATE STREET CORP | $125,622 | 126,215 | Hold |
| 11 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $123,415 | 123,998 | Added |
| 12 | Gen-Wealth Partners Inc | $106,608 | 107,111 | Trimmed |
| 13 | CITADEL ADVISORS LLC | $100,625 | 101,100 | Trimmed |
| 14 | NORTHERN TRUST CORP | $75,498 | 75,855 | Added |
| 15 | GOLDMAN SACHS GROUP INC | $69,911 | 70,241 | Trimmed |
| 16 | JANE STREET GROUP, LLC | $60,413 | 60,699 | Trimmed |
| 17 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $39,812 | 40,000 | Hold |
| 18 | TWO SIGMA SECURITIES, LLC | $35,718 | 35,887 | Added |
| 19 | NINE MASTS CAPITAL Ltd | $35,061 | 35,227 | Added |
| 20 | DIMENSIONAL FUND ADVISORS LP | $34,759 | 34,923 | Hold |
| 21 | XTX Topco Ltd | $30,068 | 30,210 | Added |
| 22 | Vontobel Holding Ltd. | $29,859 | 30,000 | Hold |
| 23 | AM INVESTMENT STRATEGIES LLC | $29,000 | 29,356 | Hold |
| 24 | Gerald Baker Financial Group LLC | $22,584 | 22,691 | New |
| 25 | MAYPORT, LLC | $21,897 | 22,000 | Hold |
Source: SEC Form 13F filings · as of 2026-03-31