Actinium Pharmaceuticals ATNM Insider Ownership

NYSE ATNM
$1.37 -0.03 (-2.51%)
As of: Oct 21, 2026 · 1:49 PM EDT

Insider Holdings by Owner

2.48Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
7.10%
▲+6.52% pp QoQ
Shares Held by Insiders
2.23Mn
filed for Sep 2026
▲+1,110.82% QoQ
Shares Outstanding
31.44Mn
31,441,436 shares
Direct Holdings
2.23Mn
Indirect: 0
Net Shares Traded (QoQ)
+2.05Mn
net buying in Sep 2026
Insiders Holding Shares
7
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Updated

Over the past year, ATNM insiders did not buy or sell the stock on the open market.

Form 4 Holdings

Insiders Holding ATNM

Insiders 7
Shares held 2.48Mn
Of outstanding 7.90%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Sandesh Seth Chief Executive Officer 1,965,355 0 1,965,355 79.1% 04 Sep, 2026
2 Matthew T David Chief Financial Officer 250,000 0 250,000 10.1% 16 Oct, 2026
3 C. David Nicholson, Director 63,300 0 63,300 2.5% 04 Sep, 2026
4 Richard I Steinhart Director 63,116 0 63,116 2.5% 04 Sep, 2026
5 Ajit Shetty Director 62,357 0 62,357 2.5% 04 Sep, 2026
6 Jeffrey W. Chell Director 61,600 0 61,600 2.5% 04 Sep, 2026
7 June Sherie Almenoff Director 18,000 0 18,000 0.7% 04 Sep, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

310 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
14 Oct, 2026 Matthew T David Chief Financial Officer Acquired A 250,000 $0.00 $0 250,000 Direct
14 Oct, 2026 Matthew T David Chief Financial Officer Acquired A 250,000 $0.00 $0 250,000 Direct
02 Sep, 2026 Ajit Shetty Director Acquired A 61,600 $0.00 $0 62,357 Direct
02 Sep, 2026 C. David Nicholson, Director Acquired A 62,800 $0.00 $0 63,300 Direct
02 Sep, 2026 Sandesh Seth Chief Executive Officer Acquired A 753,600 $0.00 $0 938,081 Direct
02 Sep, 2026 Jeffrey W. Chell Director Acquired A 61,600 $0.00 $0 61,600 Direct
02 Sep, 2026 June Sherie Almenoff Director Acquired A 18,000 $0.00 $0 18,000 Direct
02 Sep, 2026 Richard I Steinhart Director Acquired A 62,800 $0.00 $0 63,116 Direct
02 Sep, 2026 C. David Nicholson, Director Acquired A 94,200 $0.00 $0 94,200 Direct
02 Sep, 2026 Jeffrey W. Chell Director Acquired A 92,400 $0.00 $0 92,400 Direct
02 Sep, 2026 June Sherie Almenoff Director Acquired A 27,000 $0.00 $0 27,000 Direct
02 Sep, 2026 Sandesh Seth Chief Executive Officer Acquired A 1,027,274 $0.00 $0 1,965,355 Direct
02 Sep, 2026 Ajit Shetty Director Acquired A 92,400 $0.00 $0 92,400 Direct
02 Sep, 2026 Richard I Steinhart Director Acquired A 94,200 $0.00 $0 94,200 Direct
02 Sep, 2026 Sandesh Seth Chief Executive Officer Acquired A 1,130,400 $0.00 $0 1,130,400 Direct
18 Aug, 2025 Sandesh Seth Chief Executive Officer Disposed F 120,900 $1.71 $206.74K 184,481 Direct
31 Mar, 2025 Ajit Shetty Director Disposed D 2,500 $0.00 $0 0 Direct
31 Mar, 2025 Steve O'Loughlin Chief Financial Officer Disposed D 3,333 $0.00 $0 0 Direct
31 Mar, 2025 June Sherie Almenoff Director Disposed D 50,000 $0.00 $0 0 Direct
31 Mar, 2025 Sandesh Seth Chief Executive Officer Disposed D 16,666 $0.00 $0 0 Direct