Actinium PharmaceuticalsATNM
13F holders, Q1 2026 (March 31)At the end of Q1 2026, 54 institutions reported holding Actinium Pharmaceuticals Inc. (ATNM) in their 13F filings, down 6 from Q4 2025. 3 opened new positions and 11 sold out. The largest holders were Vanguard Capital Management LLC ($1.2M), Acadian Asset Management LLC ($596K) and Millennium Management ($562K). 2 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Actinium Pharmaceuticals Inc.
- CUSIP
- 00507W206
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 3 | $13K |
| Exits | 11 | $240K |
All 13F filers, Q4 2025 → Q1 2026: 372,582 shares bought and 312,457 shares sold, net +60,125 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 54 holders
| Vanguard Capital Management LLC | 0.00% | — | 1,255,516 | $1.2M |
| Acadian Asset Management LLC | 0.00% | Reduce -0.9% | 600,819 | $596K |
| Millennium Management | 0.00% | Reduce -6.2% | 564,600 | $562K |
| Renaissance Technologies | 0.00% | Add +20.7% | 471,600 | $469K |
| BlackRock, Inc. | 0.00% | Add +1.2% | 371,210 | $369K |
| Two Sigma Investments, LP | 0.00% | Add +60.8% | 337,168 | $336K |
| Geode Capital Management, LLC | 0.00% | Add +2.1% | 336,073 | $335K |
| Gagnon Securities LLC | 0.05% | Reduce -0.3% | 201,300 | $200K |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 160,265 | $159K |
| State Street Corp. | 0.00% | No change | 126,215 | $126K |
| Susquehanna International Group, LLP | 0.00% | Add +50.4% | 123,998 | $123K |
| Gen-Wealth Partners Inc | 0.03% | Reduce -0.0% | 107,111 | $107K |
| Northern Trust Corp. | 0.00% | Add +78.0% | 75,855 | $75K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -0.2% | 70,241 | $70K |
| Bridgeway Capital Management, LLC | 0.00% | No change | 40,000 | $40K |
| Two Sigma Securities, LLC | 0.00% | Add +176.8% | 35,887 | $36K |
| NINE MASTS CAPITAL Ltd | 0.01% | Add +172.2% | 35,227 | $35K |
| Dimensional Fund Advisors LP | 0.00% | No change | 34,923 | $35K |
| Jane Street Group, LLC | 0.00% | Reduce -63.2% | 34,299 | $34K |
| XTX Topco Ltd | 0.00% | Add +16.3% | 30,210 | $30K |
| Vontobel Holding Ltd. | 0.00% | No change | 30,000 | $30K |
| Am Investment Strategies LLC | 0.01% | No change | 29,356 | $29K |
| Gerald Baker Financial Group LLC | 0.01% | — | 22,691 | $23K |
| Mayport, LLC | 0.00% | No change | 22,000 | $22K |
| North Star Asset Management Inc. | 0.00% | No change | 20,000 | $20K |
| Osaic Holdings, Inc. | 0.00% | Reduce -2.0% | 19,865 | $20K |
| Wells Fargo & Company | 0.00% | No change | 19,800 | $20K |
| Qube Research & Technologies Ltd | 0.00% | Reduce -4.1% | 18,048 | $18K |
| UBS Group AG | 0.00% | Add +15127.1% | 14,618 | $15K |
| Morgan Stanley | 0.00% | Reduce -28.7% | 13,597 | $14K |
| Virtu Financial LLC | 0.00% | New | 12,324 | $12K |
| Callan Family Office, LLC | 0.00% | Reduce -49.4% | 11,944 | $12K |
| Intrepid Financial Planning Group LLC | 0.00% | No change | 10,500 | $10K |
| Level Four Advisory Services, LLC | 0.00% | No change | 10,000 | $10K |
| Savvy Advisors, Inc. | 0.00% | No change | 10,000 | $10K |
| Vanguard Global Advisers, LLC | 0.00% | — | 8,893 | $9K |
| Rockefeller Capital Management L.P. | 0.00% | No change | 4,000 | $4K |
| Steward Partners Investment Advisory, LLC | 0.00% | No change | 2,166 | $2K |
| JPMorgan Chase & Co. | 0.00% | No change | 1,494 | $1K |
| Advisory Services Network, LLC | 0.00% | New | 1,460 | $1K |
| Federated Hermes, Inc. | 0.00% | No change | 1,403 | $1K |
| National Bank of Canada | 0.00% | Add +19.4% | 1,021 | $1K |
| Citigroup Inc. | 0.00% | Add +57.3% | 678 | $675 |
| SBI Securities Co., Ltd. | 0.00% | No change | 542 | $539 |
| Jones Financial Companies LLLP | 0.00% | No change | 351 | $362 |
| Cwm, LLC | 0.00% | Reduce -43.4% | 351 | $349 |
| Pittenger & Anderson Inc. | 0.00% | No change | 341 | $340 |
| Nisa Investment Advisors, LLC | 0.00% | Reduce -65.5% | 330 | $328 |
| Investors Research Corp | 0.00% | No change | 300 | $299 |
| BNP Paribas Financial Markets | 0.00% | No change | 237 | $236 |
| Northwestern Mutual Wealth Management Co. | 0.00% | No change | 107 | $106 |
| FMR LLC | 0.00% | Reduce -99.5% | 79 | $79 |
| Caitong International Asset Management Co., Ltd | 0.00% | New | 1 | $1 |
| Royal Bank of Canada | 0.00% | Reduce -43.8% | 45 | $0 |
"% of holder's portfolio" is ATNM's weight in each manager's 13F, not the share of Actinium Pharmaceuticals Inc. the manager owns.