Actinium Pharmaceuticals, Inc. (ATNM) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

31,195,891Shares Outstanding

5,485,050Shares held by institutions

$5,377,543Value of institutional holdings

17.58%Institutional ownership %

9.96%Shares Changed QoQ

59No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Actinium Pharmaceuticals, Inc. (NYSE:ATNM) showed up in the 13F filings of 59 institutional investors as of December 2025.

These investors held 17.3% of outstanding shares in December 2025, up from 16.4% in September 2025.
They increased total shares held in Actinium Pharmaceuticals by 9.41% from last quarter, and the number of investors in ATNM decreased 15.71% annually.
Of these 59 holders, 22 added to their stakes in Actinium Pharmaceuticals, 19 trimmed positions, and 18 made no changes.
Institutional investors collectively held 5.41Mn shares in Actinium Pharmaceuticals as of December 2025, up by 465.31K shares quarter on quarter, and down 3.13Mn shares year over year.
VANGUARD GROUP INC leads ownership in ATNM with 1.42Mn shares as of December 31, 2025, equal to 4.56% of outstanding shares.
The biggest buyers of Actinium Pharmaceuticals for the quarter ending December 2025 included ACADIAN ASSET MANAGEMENT LLC (116.76K), RENAISSANCE TECHNOLOGIES LLC (102.15K), Goldman Sachs Group Inc (70.36K), Squarepoint Ops LLC (65.73K), BAILARD, INC. (57.87K).
Leading sellers of Actinium Pharmaceuticals shares for the quarter ending December 2025 were TWO SIGMA INVESTMENTS, LP (24.6K), GAGNON SECURITIES LLC (24.45K), MILLENNIUM MANAGEMENT LLC (23.1K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (22.97K), UBS Group AG (14.48K).
Actinium Pharmaceuticals's 10 largest shareholders as of December 2025 include VANGUARD GROUP INC (1.42Mn), ACADIAN ASSET MANAGEMENT LLC (606.34K), MILLENNIUM MANAGEMENT LLC (601.6K), RENAISSANCE TECHNOLOGIES LLC (390.78K), BlackRock, Inc. (366.93K), GEODE CAPITAL MANAGEMENT, LLC (328.99K), TWO SIGMA INVESTMENTS, LP (209.69K), GAGNON SECURITIES LLC (201.81K), TWO SIGMA ADVISERS, LP (196.08K), State Street Corp (126.22K) per Business Quant data.

59 Institutional Holders

5,485,050 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
VANGUARD GROUP INC	31 Dec, 2025	1,421,038	36,495	2.64%	$1,932,611.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	606,339	116,762	23.85%	$823.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	601,600	-23,097	-3.70%	$818,176.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	390,784	102,154	35.39%	$531,466.00
BlackRock, Inc.	31 Dec, 2025	366,931	3,445	0.95%	$499,026.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	328,994	575	0.18%	$447,564.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	209,692	-24,601	-10.50%	$285,181.00
GAGNON SECURITIES LLC	31 Dec, 2025	201,807	-24,450	-10.81%	$274,458.00
TWO SIGMA ADVISERS, LP	31 Dec, 2025	196,076	-300	-0.15%	$266,663.00
Goldman Sachs Group Inc	31 Dec, 2025	140,716	140,716	0.00%	$191,374.00
State Street Corp	31 Dec, 2025	126,215	0	0.00%	$171,652.00
Gen-Wealth Partners Inc	31 Dec, 2025	107,131	-2,250	-2.06%	$145,698.00
JANE STREET GROUP, LLC	31 Dec, 2025	93,192	170	0.18%	$126,742.00
SUSQUEHANNA INTERNATIONAL GROUP, LLP	31 Dec, 2025	82,474	-22,966	-21.78%	$112,165.00
Squarepoint Ops LLC	31 Dec, 2025	65,730	65,730	0.00%	$89,393.00
BAILARD, INC.	31 Dec, 2025	57,867	57,867	0.00%	$78,699.00
Northern Trust Corp	31 Dec, 2025	42,610	6,715	18.71%	$57,950.00
BRIDGEWAY CAPITAL MANAGEMENT, LLC	31 Dec, 2025	40,000	0	0.00%	$54,400.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	34,923	0	0.00%	$47,495.00
Vontobel Holding Ltd.	31 Dec, 2025	30,000	0	0.00%	$40,800.00

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