Actinium Pharmaceuticals ATNM Institutional Ownership

NYSE ATNM

$1.14 +0.02 (+1.79%)

As of: Oct 1, 2026 · 3:57 PM EDT

Institutions by Trading Activity

48 Institutions

Increased 13 27.1%

Unchanged 15 31.3%

Reduced 20 41.7%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

16.85%

▼-0.12 pp QoQ

Shares Held by Institutions

5.29Mn

of 31.40Mn outstanding

▲+4.91% QoQ

Shares Outstanding

31.40Mn

26.11Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▼-6 vs prior quarter

Net Shares Added (QoQ)

+247.68K

accumulated since last quarter

Value of Holdings

$6.08Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Actinium Pharmaceuticals, Inc. (NYSE:ATNM) has 48 institutional investors that have filed 13F reports for the period ending June 2026.

Collectively, these holders controlled 16.9% of Actinium Pharmaceuticals's outstanding shares in June 2026, down from 17.0% in March 2026.
They increased total shares held in ATNM by 4.91% quarter over quarter, and investors in Actinium Pharmaceuticals decreased 22.58% from a year ago.
Of these 48 funds, 13 grew their exposure to Actinium Pharmaceuticals, 20 cut back, and 15 maintained positions.
Combined, these investors held 5.29Mn shares in ATNM for June 2026, up by 247.68K shares quarter on quarter, and down 96.74K shares year over year.
VANGUARD CAPITAL MANAGEMENT LLC is the top holder of Actinium Pharmaceuticals as of June 30, 2026, with 1.24Mn shares representing 3.94% of outstanding stock.
The largest buyers of Actinium Pharmaceuticals for the quarter ending June 2026 were COMPASS FINANCIAL MANAGEMENT LLC (600.23K), Bluespring Wealth Management, LLC (43.0K), Qube Research & Technologies Ltd (39.76K), BlackRock, Inc. (24.69K), Vontobel Holding Ltd. (20.0K).
Top sellers of ATNM stock for the quarter ending June 2026 included ACADIAN ASSET MANAGEMENT LLC (104.53K), RENAISSANCE TECHNOLOGIES LLC (91.11K), TWO SIGMA INVESTMENTS, LP (77.99K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (67.18K), MILLENNIUM MANAGEMENT LLC (50.02K).
According to Business Quant data, leading holders of ATNM for June 2026 are VANGUARD CAPITAL MANAGEMENT LLC (1.24Mn), COMPASS FINANCIAL MANAGEMENT LLC (600.23K), MILLENNIUM MANAGEMENT LLC (514.58K), ACADIAN ASSET MANAGEMENT LLC (496.29K), BlackRock, Inc. (395.9K), RENAISSANCE TECHNOLOGIES LLC (380.49K), GEODE CAPITAL MANAGEMENT, LLC (324.94K), TWO SIGMA INVESTMENTS, LP (259.18K), GAGNON SECURITIES LLC (182.14K), VANGUARD FIDUCIARY TRUST CO (161.53K).

Form 13F Holdings

48 Institutional Holders

Report period 30 Jun, 2026

Total shares held 5.29Mn

Of outstanding 16.85%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	1,238,302	3.94%	▼17,214	-1.37%	$1.21Mn
2	COMPASS FINANCIAL MANAGEMENT LLC	0002148724	600,230	1.91%	▲600,230	0.00%	$588.23K
3	MILLENNIUM MANAGEMENT LLC	0001273087	514,580	1.64%	▼50,020	-8.86%	$504.29K
4	ACADIAN ASSET MANAGEMENT LLC	0000916542	496,288	1.58%	▼104,531	-17.40%	$485
5	BlackRock, Inc.	0002012383	395,896	1.26%	▲24,686	+6.65%	$387.98K
6	RENAISSANCE TECHNOLOGIES LLC	0001037389	380,491	1.21%	▼91,109	-19.32%	$372.88K
7	GEODE CAPITAL MANAGEMENT, LLC	0001214717	324,945	1.03%	▼11,128	-3.31%	$318.55K
8	TWO SIGMA INVESTMENTS, LP	0001179392	259,179	0.83%	▼77,989	-23.13%	$254.00K
9	GAGNON SECURITIES LLC	0001125725	182,142	0.58%	▼19,158	-9.52%	$178.50K
10	VANGUARD FIDUCIARY TRUST CO	0000933478	161,526	0.51%	▲1,261	+0.79%	$158.30K
11	State Street Corp	0000093751	122,215	0.39%	▼4,000	-3.17%	$119.77K
12	Gen-Wealth Partners Inc	0002023375	105,111	0.33%	▼2,000	-1.87%	$103.01K
13	Northern Trust Corp	0000073124	69,743	0.22%	▼6,112	-8.06%	$68.35K
14	Qube Research & Technologies Ltd	0001729829	57,812	0.18%	▲39,764	+220.32%	$56.66K
15	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0001446194	56,822	0.18%	▼67,176	-54.18%	$55.69K
16	Vontobel Holding Ltd.	0001588340	50,000	0.16%	▲20,000	+66.67%	$49.00K
17	Bluespring Wealth Management, LLC	0001557485	43,000	0.14%	▲43,000	0.00%	$42.14K
18	BRIDGEWAY CAPITAL MANAGEMENT, LLC	0001107261	40,000	0.13%	0	0.00%	$39.20K
19	AM INVESTMENT STRATEGIES LLC	0001818897	29,356	0.09%	0	0.00%	$29
20	Gerald Baker Financial Group LLC	0002133489	22,691	0.07%	0	0.00%	$22.24K

Showing 1 to 20 of 48 holders