ATNM · Actinium Pharmaceuticals, Inc. · Shareholders & Ownership

$1.38 -0.02 (-1.43%)

Market Cap

$43.70M

31.44M

Volume · Oct 20 901.05K Avg daily vol (3M) 164.32K

Every disclosed holder of ATNM in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns ATNM

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	46	5,287,668	16.82%	Yes
Insiders (Forms 3, 4, 5)	8	2,601,244	8.27%	Yes
13D/G-only blocks	1	1,895,202	6.03%	Yes
Remaining	—	21,657,322	68.88%	Rest
Registered funds (N-PORT, not summed)	11	1,662,427	5.29%	No

Shares outstanding: 31,441,436, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of ATNM

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	SETH SANDESH Insider CIK 1566175 · Sep 2, 2026 Director, Chief Executive Officer, issuer-wide	1,965,355	6.25%	+1,780,874	Sep 2, 2026	Director, Chief Executive Officer, issuer-wide
2	Michael Bigger 13G CIK 1996245 · Unknown · Dec 31, 2023 Rule 13d-1(c), passive investor	1,895,202	6.03%	—	Dec 31, 2023	Rule 13d-1(c), passive investor
3	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,238,302	3.94%	-17,214	Jun 30, 2026	carried, not yet filed for the newest quarter
4	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	918,557	2.92%	0	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
5	COMPASS FINANCIAL MANAGEMENT LLC 13F CIK 2148724 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	600,230	1.91%	—	Jun 30, 2026	carried, not yet filed for the newest quarter
6	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	514,580	1.64%	-50,020	Jun 30, 2026	carried, not yet filed for the newest quarter
7	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	496,288	1.58%	-104,531	Jun 30, 2026	carried, not yet filed for the newest quarter
8	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	395,896	1.26%	+24,686	Jun 30, 2026	carried, not yet filed for the newest quarter
8.1	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	106,723	0.34%	+24,180	Jun 30, 2026	iShares Trust, not summed
9	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	380,491	1.21%	-91,109	Jun 30, 2026	carried, not yet filed for the newest quarter
10	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	324,945	1.03%	-11,128	Jun 30, 2026	carried, not yet filed for the newest quarter
11	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	315,369	1.00%	+11,175	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
12	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	259,179	0.82%	-77,989	Jun 30, 2026	carried, not yet filed for the newest quarter
13	Kamal Adeela Insider CIK 2153988 · Sep 3, 2026 Chief Scientific Officer, issuer-wide	213,648	0.68%	—	Sep 3, 2026	Chief Scientific Officer, issuer-wide
14	GAGNON SECURITIES LLC 13F CIK 1125725 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	182,142	0.58%	-19,158	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Fidelity Extended Market Index Fund Fund S000006021 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	171,447	0.55%	+5,641	May 31, 2026	Fidelity Concord Street Trust, not summed
16	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	161,526	0.51%	+1,261	Jun 30, 2026	carried, not yet filed for the newest quarter
17	Heeger Steffen Wilhem Insider CIK 2154146 · Sep 3, 2026 Chief Medical Officer, issuer-wide	153,868	0.49%	—	Sep 3, 2026	Chief Medical Officer, issuer-wide
18	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	122,215	0.39%	-4,000	Jun 30, 2026	carried, not yet filed for the newest quarter
19	Gen-Wealth Partners Inc 13F CIK 2023375 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	105,111	0.33%	-2,000	Jun 30, 2026	carried, not yet filed for the newest quarter
20	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	69,743	0.22%	-6,112	Jun 30, 2026	carried, not yet filed for the newest quarter
21	Nicholson, C. David Insider CIK 1636168 · Sep 2, 2026 Director, issuer-wide	63,300	0.20%	—	Sep 2, 2026	Director, issuer-wide
22	Steinhart Richard I Insider CIK 1293789 · Sep 2, 2026 Director, issuer-wide	63,116	0.20%	—	Sep 2, 2026	Director, issuer-wide
23	Shetty Ajit Insider CIK 1667471 · Sep 2, 2026 Director, issuer-wide	62,357	0.20%	—	Sep 2, 2026	Director, issuer-wide
24	Chell Jeffrey W. Insider CIK 1738374 · Sep 2, 2026 Director, issuer-wide	61,600	0.20%	—	Sep 2, 2026	Director, issuer-wide
25	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	57,812	0.18%	+39,764	Jun 30, 2026	carried, not yet filed for the newest quarter
26	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	56,822	0.18%	-67,176	Jun 30, 2026	carried, not yet filed for the newest quarter
27	Fidelity Total Market Index Fund Fund S000006026 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	52,287	0.17%	0	May 31, 2026	Fidelity Concord Street Trust, not summed
28	Vontobel Holding Ltd. 13F CIK 1588340 · Unknown · Sep 30, 2026	50,000	0.16%	0	Sep 30, 2026
29	Fidelity Series Total Market Index Fund Fund S000065248 · Registered fund · May 31, 2026 Fidelity Concord Street Trust, not summed	44,530	0.14%	0	May 31, 2026	Fidelity Concord Street Trust, not summed
30	SNS Financial Group, LLC 13F CIK 1557485 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	43,000	0.14%	+43,000	Jun 30, 2026	carried, not yet filed for the newest quarter
31	BRIDGEWAY CAPITAL MANAGEMENT, LLC 13F CIK 1107261 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	40,000	0.13%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
31.1	Ultra-Small Company Market Fund Fund S000004424 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	40,000	0.13%	0	Jun 30, 2026	Bridgeway Funds, Inc., not summed
32	AM INVESTMENT STRATEGIES LLC 13F CIK 1818897 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	29,356	0.09%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
33	MAYPORT, LLC 13F CIK 1922875 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	22,000	0.07%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
34	NORTH STAR ASSET MANAGEMENT INC 13F CIK 1056559 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	20,000	0.06%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
35	Gerald Baker Financial Group LLC 13F CIK 2133489 · Unknown · Sep 30, 2026	19,920	0.06%	-2,771	Sep 30, 2026
36	WELLS FARGO & COMPANY/MN 13F CIK 72971 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	19,800	0.06%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
37	OSAIC HOLDINGS, INC. 13F CIK 1677044 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	18,865	0.06%	-1,000	Jun 30, 2026	carried, not yet filed for the newest quarter
38	Almenoff June Sherie Insider CIK 1492647 · Sep 2, 2026 Director, issuer-wide	18,000	0.06%	—	Sep 2, 2026	Director, issuer-wide
39	XTX Topco Ltd 13F CIK 1828301 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	13,731	0.04%	-16,479	Jun 30, 2026	carried, not yet filed for the newest quarter
40	Savvy Advisors, Inc. 13F CIK 2003633 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	10,000	0.03%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
41	Vanguard Global Advisers, LLC 13F CIK 1811242 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	8,893	0.03%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
42	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	6,758	0.02%	-7,860	Jun 30, 2026	carried, not yet filed for the newest quarter
43	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	6,341	0.02%	-7,256	Jun 30, 2026	carried, not yet filed for the newest quarter
44	1290 VT Micro Cap Portfolio Fund S000044688 · Registered fund · Jun 30, 2026 EQ Advisors Trust, not summed	5,849	0.02%	0	Jun 30, 2026	EQ Advisors Trust, not summed
45	VANGUARD BALANCED INDEX FUND Fund S000002560 · Registered fund · Jun 30, 2026 VANGUARD VALLEY FORGE FUNDS, not summed	4,376	0.01%	-24,753	Jun 30, 2026	VANGUARD VALLEY FORGE FUNDS, not summed
46	Rockefeller Capital Management L.P. 13F CIK 1739439 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,000	0.01%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
47	Blackstone Alternative Multi-Strategy Fund Fund S000045538 · Registered fund · Jun 30, 2026 Blackstone Alternative Investment Funds, not summed	3,114	0.01%	0	Jun 30, 2026	Blackstone Alternative Investment Funds, not summed
48	Steward Partners Investment Advisory, LLC 13F CIK 1723397 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,000	0.01%	-166	Jun 30, 2026	carried, not yet filed for the newest quarter
49	NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO 13F CIK 1141802 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,657	0.01%	+1,550	Jun 30, 2026	carried, not yet filed for the newest quarter
50	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,494	0.00%	0	Jun 30, 2026	carried, not yet filed for the newest quarter

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 64 holders

Create a free account to page through every holder, filter by source and group by ultimate parent.

Key facts CIK 1388320 CUSIP 00507W206 13F (30d) 4 filings 4 filers Visit website Investor relations