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Who owns Actinium Pharmaceuticals (ATNM) stock

43 funds reported Actinium Pharmaceuticals (ATNM) shares in their latest 13F filings, worth $7.0M in all. The largest holder is Vanguard Group ($1.9M). Last quarter 9 funds added to their stakes and 30 cut them.

Largest holders of ATNM (13F)Largest holders of ATNM (13F)Vanguard Group$1.9MVanguard Capital Management LLC$1.2MCompass Financial Management LLC$588KMillennium Management LLC$504KAcadian Asset Management LLC$485KBlackRock$388KRenaissance Technologies LLC$373KGeode Capital Management, LLC$319KTwo Sigma Investments, LP$254KGagnon Securities LLC$178K

Largest holders (13F)

FundSharesValueChangeQuarter
Vanguard Group1,421,038$1.9Mincrease2025-12-31
Vanguard Capital Management LLC1,238,302$1.2Mdecrease2026-06-30
Compass Financial Management LLC600,230$588Kbase2026-06-30
Millennium Management LLC514,580$504Kdecrease2026-06-30
Acadian Asset Management LLC496,288$485Kdecrease2026-06-30
BlackRock395,896$388Kincrease2026-06-30
Renaissance Technologies LLC380,491$373Kdecrease2026-06-30
Geode Capital Management, LLC324,945$319Kdecrease2026-06-30
Two Sigma Investments, LP259,179$254Kdecrease2026-06-30
Gagnon Securities LLC182,142$178Kdecrease2026-06-30
Vanguard Fiduciary Trust161,526$158Kincrease2026-06-30
State Street122,215$120Kdecrease2026-06-30
Northern Trust69,743$68Kdecrease2026-06-30
Qube Research & Technologies57,812$57Kincrease2026-06-30
Vontobel Holding50,000$56Kunchanged2026-09-30

Actinium Pharmaceuticals' latest quarter

Actinium Pharmaceuticals, Q2 2026: revenue $35.0M, operating margin 78.8%, net earnings $27.9M, operating cash flow −$5.2M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most ATNM stock?

By the latest 13F filings: Vanguard Group ($1.9M); Vanguard Capital Management LLC ($1.2M); Compass Financial Management LLC ($588K); Millennium Management LLC ($504K); Acadian Asset Management LLC ($485K).

What is the short interest in ATNM?

631,234 shares were sold short at the 2026-10-15 settlement, -10.57% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.