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Buy Day today: Neutral (51) Mixed market breadth · no major macro event
ATNM

Actinium Pharmaceuticals Inc

Healthcare · Biotechnology

1.20$ +2.5% vs. previous close Closing price · As of: Sep 18, 2026

Ownership

Ownership Structure

Who owns Actinium Pharmaceuticals Inc (ATNM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 98.2% of the shares are freely tradable; institutional investors hold 20.6%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 20.6%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 2.4%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 98.2%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 2.2%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 31Mio.

Largest Shareholders

No ownership data is available for this stock yet.

Insider holdings

Insider holdings ATNM
Person Role Shares Value As of Type
Seth Sandesh Chief Executive Officer 1,965,355 2,358,426 $ Sep 2, 2026 direct
Nicholson, C. David Director 63,300 75,960 $ Sep 2, 2026 direct
Steinhart Richard I Director 63,116 75,739 $ Sep 2, 2026 direct
Shetty Ajit Director 62,357 74,828 $ Sep 2, 2026 direct
Chell Jeffrey W. Director 61,600 73,920 $ Sep 2, 2026 direct
Almenoff June Sherie Director 18,000 21,600 $ Sep 2, 2026 direct

Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.

Insiders

Insider Transactions

Insider Transactions
Date Person Role Type Shares Price Value
Sep 2, 2026 Nicholson, C. David Director Other 62,800 0.00 –
Sep 2, 2026 Shetty Ajit Director Other 61,600 0.00 –
Sep 2, 2026 Almenoff June Sherie Director Other 18,000 0.00 –
Sep 2, 2026 Seth Sandesh Chief Executive Officer Other 1,027,274 0.00 –
Sep 2, 2026 Seth Sandesh Chief Executive Officer Other 753,600 0.00 –
Sep 2, 2026 Steinhart Richard I Director Other 62,800 0.00 –
Sep 2, 2026 Chell Jeffrey W. Director Other 61,600 0.00 –

Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →

Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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