ACTINIUM PHARMACEUTICALS INC ATNM
COM · Common Stock · CUSIP 00507W206 · ISIN US00507W2061
- SectorHealth care
- IndustryPharmaceutical Preparations
- HeadquartersNew York, NY
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 31.4m as of 2026-08-06, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $0.98. Options: 3 managers hold calls ($25.3k notional), 0 hold puts (—).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 57 |
| Q4 2022 | 59 |
| Q1 2023 | 65 |
| Q2 2023 | 72 |
| Q3 2023 | 59 |
| Q4 2023 | 60 |
| Q1 2024 | 68 |
| Q2 2024 | 75 |
| Q3 2024 | 73 |
| Q4 2024 | 70 |
| Q1 2025 | 70 |
| Q2 2025 | 64 |
| Q3 2025 | 61 |
| Q4 2025 | 60 |
| Q1 2026 | 54 |
| Q2 2026 | 47 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 39 | 37 |
| Q4 2024 | 37 | 31 |
| Q1 2025 | 33 | 25 |
| Q2 2025 | 29 | 47 |
| Q3 2025 | 18 | 39 |
| Q4 2025 | 22 | 27 |
| Q1 2026 | 15 | 26 |
| Q2 2026 | 10 | 32 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $113.0k | $800 | 0.01 |
| Q4 2025 | $219.4k | $0 | 0.00 |
| Q1 2026 | $147.5k | $0 | 0.00 |
| Q2 2026 | $25.3k | $0 | 0.00 |
Biggest buyers
| Bluespring Wealth Management, LLC | New | +43.0k |
| Qube Research & Technologies Ltd | Added | +39.8k |
| BlackRock, Inc. | Added | +24.7k |
| Vontobel Holding Ltd. | Added | +20.0k |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | Added | +1.6k |
| VANGUARD FIDUCIARY TRUST CO | Added | +1.3k |
| JONES FINANCIAL COMPANIES LLLP | Added | +1.0k |
| HARBOUR INVESTMENTS, INC. | New | +334 |
| BARCLAYS PLC | New | +203 |
| Axiom Investment Management LLC | New | +5 |
Biggest sellers
| ACADIAN ASSET MANAGEMENT LLC | Reduced | -104.5k |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | -91.1k |
| TWO SIGMA INVESTMENTS, LP | Reduced | -78.0k |
| GOLDMAN SACHS GROUP INC | Sold out | -70.2k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | -67.2k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -50.0k |
| TWO SIGMA SECURITIES, LLC | Sold out | -35.9k |
| NINE MASTS CAPITAL Ltd | Sold out | -35.2k |
| DIMENSIONAL FUND ADVISORS LP | Sold out | -34.9k |
| JANE STREET GROUP, LLC | Sold out | -34.3k |
Biggest calls
| JANE STREET GROUP, LLC | Reduced | $19.1k19.5k shares |
| GROUP ONE TRADING LLC | Added | $3.6k3.7k shares |
| SIMPLEX TRADING, LLC | Reduced | $2.5k2.6k shares |
Biggest puts
| None |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
None reported since 1 Apr 2026.
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 1.2m $1.2m | Reduced -17.2k |
| COMPASS FINANCIAL MANAGEMENT LLC 0.07% of their portfolio | 600.2k $588.2k | First filing |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 514.6k $504.3k | Reduced -50.0k |
| ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio | 496.3k $485.0k | Reduced -104.5k |
| BlackRock, Inc. 0.00% of their portfolio | 395.9k $388.0k | Added +24.7k |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 380.5k $372.9k | Reduced -91.1k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 324.9k $318.6k | Reduced -11.1k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 259.2k $254.0k | Reduced -78.0k |
| GAGNON SECURITIES LLC 0.03% of their portfolio | 182.1k $178.5k | Reduced -19.2k |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 161.5k $158.3k | Added +1.3k |
| STATE STREET CORP 0.00% of their portfolio | 122.2k $119.8k | Reduced -4.0k |
| Gen-Wealth Partners Inc 0.03% of their portfolio | 105.1k $103.0k | Reduced -2.0k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 69.7k $68.3k | Reduced -6.1k |
| Qube Research & Technologies Ltd 0.00% of their portfolio | 57.8k $56.7k | Added +39.8k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 56.8k $55.7k | Reduced -67.2k |
| Vontobel Holding Ltd. 0.00% of their portfolio | 50.0k $49.0k | Added +20.0k |
| Bluespring Wealth Management, LLC 0.00% of their portfolio | 43.0k $42.1k | New |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 40.0k $39.2k | Unchanged |
| AM INVESTMENT STRATEGIES LLC 0.01% of their portfolio | 29.4k $29.0k | Unchanged |
| Gerald Baker Financial Group LLC 0.01% of their portfolio | 22.7k $22.2k | Unchanged |
| MAYPORT, LLC 0.00% of their portfolio | 22.0k $21.6k | Unchanged |
| NORTH STAR ASSET MANAGEMENT INC 0.00% of their portfolio | 20.0k $19.6k | Unchanged |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 19.8k $19.4k | Unchanged |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 18.9k $18.5k | Reduced -1.0k |
| XTX Topco Ltd 0.00% of their portfolio | 13.7k $13.5k | Reduced -16.5k |
| Savvy Advisors, Inc. 0.00% of their portfolio | 10.0k $9.8k | Unchanged |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 8.9k $8.7k | Unchanged |
| UBS Group AG 0.00% of their portfolio | 6.8k $6.6k | Reduced -7.9k |
| MORGAN STANLEY 0.00% of their portfolio | 6.3k $6.2k | Reduced -7.3k |
| Rockefeller Capital Management L.P. 0.00% of their portfolio | 4.0k $3.9k | Unchanged |
| Steward Partners Investment Advisory, LLC 0.00% of their portfolio | 2.0k $2.0k | Reduced -166 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO 0.00% of their portfolio | 1.7k $1.6k | Added +1.6k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 1.5k $1.5k | Unchanged |
| JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio | 1.4k $1.3k | Added +1.0k |
| NATIONAL BANK OF CANADA /FI/ 0.00% of their portfolio | 921 $903 | Reduced -100 |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 492 $482 | Reduced -50 |
| PITTENGER & ANDERSON INC 0.00% of their portfolio | 341 $335 | Unchanged |
| HARBOUR INVESTMENTS, INC. 0.00% of their portfolio | 334 $327 | New |
| NISA INVESTMENT ADVISORS, LLC 0.00% of their portfolio | 330 $323 | Unchanged |
| Investors Research Corp 0.00% of their portfolio | 300 $294 | Unchanged |
| Allied Private Wealth LLC 0.00% of their portfolio | 240 $232 | First filing |
| BARCLAYS PLC 0.00% of their portfolio | 203 $199 | New |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 201 $197 | Reduced -36 |
| FEDERATED HERMES, INC. 0.00% of their portfolio | 137 $134 | Reduced -1.3k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 45 $0 | Unchanged |
| Axiom Investment Management LLC 0.00% of their portfolio | 5 $5 | New |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 1 $1 | Unchanged |