$ATNM

$1.40 -$0.12 (7.89%) Close

$ATNM Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 31.4M shares outstanding

Who owns ATNM?

By type of holder

Institutions 16.7% Insiders 9.1% Everyone else 74.3%

Concentration Top 10 holders own 20.4%

Seth Sandesh 6.3% · Vanguard Capital Management LLC 3.9%

Institutional ownership

16.7%

-0.2 pts vs last qtr

Institutional holders

-8 vs last qtr

Net shares bought

−67.1K

by institutions in Q2 2026

New / sold out

6 / 14

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Compass Financial Management LLC NEW +600.2K
Bluespring Wealth Management, LLC NEW +43.0K

Biggest sellers in Q2 2026

Susquehanna International Group, LLP SOLD OUT −124.0K
Acadian Asset Management LLC −104.5K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Actinium Pharmaceuticals Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2021–FY2025

+51.7%

+10.97% a year

Each share's claim on the business

−34.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $22.8M

over 5 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years46% 3–5 years0% 1–3 years38% Under 1 year16%

Quarterly turnover

14.4%

of institutional shares changed hands

Top 10 managers, median time held

2 years

Super Investors

Investment managers reporting ATNM on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
VC Vanguard Capital Management LLC	1.2M	3.94%	−17.2K (−1.4%)	≤2021	0.0%
Shares held by quarter Peak holding1.3M (Q1'26) Change over 8 quarters+1.2M Share of the company3.940% Vanguard Capital Management LLC's full portfolio →
AA Acadian Asset Management LLC	496.3K	1.58%	−104.5K (−17.4%)	2024	0.0%
Shares held by quarter Peak holding606.3K (Q4'25) Change over 8 quarters+42.6K Share of the company1.580% Acadian Asset Management LLC's full portfolio →

Vanguard Capital Management LLC

1.2M

% of company

3.94%

Change vs last qtr

−17.2K (−1.4%)

Held since

≤2021

Acadian Asset Management LLC

496.3K

% of company

1.58%

Change vs last qtr

−104.5K (−17.4%)

Held since

2024

28 more super investors behind a free account

See every manager holding Actinium Pharmaceuticals Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ATNM on Form N-PORT; together they hold 5.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$900K	918.6K	2.92%	0.00%	June 30, 2026
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$309K	315.4K	1.00%	0.00%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$900K

% of company

2.92%

% of the fund

0.00%

As of

June 30, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$309K

% of company

1.00%

% of the fund

0.00%

As of

June 30, 2026

10 more funds behind a free account

See every fund holding Actinium Pharmaceuticals Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
SS Seth Sandesh Insider	2.0M	6.25%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company6.250% Seth Sandesh's insider activity →
DM David Matthew T Insider	250.0K	0.80%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.800% David Matthew T's insider activity →

Seth Sandesh

Insider

2.0M

% of company

6.25%

Change vs last qtr

—

Held since

—

David Matthew T

Insider

250.0K

% of company

0.80%

Change vs last qtr

—

Held since

—

7 more holders behind a free account

See every insider and 5%+ holder of Actinium Pharmaceuticals Inc.

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