ASPI · ASP Isotopes Inc. · Shareholders & Ownership

$1.98 -0.12 (-5.50%)

Russell 2000 member Rebalance outlook locked

Market Cap

$312.75M

153.31M

Volume · Oct 23 960.86K Avg daily vol (3M) 4.09M

Every disclosed holder of ASPI 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 ASPI

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)	187	65,618,170	42.80%	Yes
Insiders (Forms 3, 4, 5)	1	100,000	0.07%	Yes
13D/G-only blocks	2	12,714,799	8.29%	Yes
Remaining	—	74,876,411	48.84%	Rest
Registered funds (N-PORT, not summed)	113	20,160,575	13.15%	No

Shares outstanding: 153,309,380, 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 ASPI

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	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	9,217,198	6.01%	+889,054	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	3,041,965	1.98%	+289,866	Jun 30, 2026	iShares Trust, not summed
1.2	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	903,929	0.59%	-23,272	Jun 30, 2026	iShares Trust, not summed
1.3	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	391,459	0.26%	+104,746	Jun 30, 2026	iShares Trust, not summed
1.4	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	217,728	0.14%	+64,013	Jun 30, 2026	Quantitative Master Series LLC, not summed
1.5	iShares Core S&P Total U.S. Stock Market ETF Fund S000004317 · Registered fund · Jun 30, 2026 iShares Trust, not summed	181,937	0.12%	+4,352	Jun 30, 2026	iShares Trust, not summed
2	Mann Paul Elliot 13G CIK 1744816 · Unknown · Dec 31, 2025 Rule 13d-1(d), exempt investor	7,759,538	5.06%	+46,556	Dec 31, 2025	Rule 13d-1(d), exempt investor
3	Encompass Capital Advisors LLC 13F CIK 1541901 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	6,561,754	4.28%	-350,300	Jun 30, 2026	carried, not yet filed for the newest quarter
4	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,982,953	3.25%	-77,511	Jun 30, 2026	carried, not yet filed for the newest quarter
5	AK Jensen Investment Management Limited 13G CIK 1962663 · Non-US institution · Sep 30, 2025 Rule 13d-1(b), qualified institution	4,955,261	3.23%	+246,710	Sep 30, 2025	Rule 13d-1(b), qualified institution
6	Rovida Investment Management Ltd 13F CIK 2053064 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	4,100,000	2.67%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
7	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	3,593,895	2.34%	-108,200	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
8	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	3,247,633	2.12%	+405,924	Jun 30, 2026	carried, not yet filed for the newest quarter
9	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,945,901	1.92%	+205,437	Jun 30, 2026	carried, not yet filed for the newest quarter
10	Alyeska Investment Group, L.P. 13F CIK 1453072 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,843,503	1.85%	+151,337	Jun 30, 2026	carried, not yet filed for the newest quarter
11	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	2,595,573	1.69%	+273,414	Jun 30, 2026	carried, not yet filed for the newest quarter
11.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	41,100	0.03%	+2,200	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
11.2	State Street(R) SPDR(R) Portfolio MSCI Global Stock Market ETF Fund S000036082 · Registered fund · Jun 30, 2026 SPDR INDEX SHARES FUNDS, not summed	5,146	0.00%	+1,306	Jun 30, 2026	SPDR INDEX SHARES FUNDS, not summed
11.3	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	3,045	0.00%	+401	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
11.4	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	414	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
12	EXCHANGE TRADED CONCEPTS, LLC 13F CIK 1457320 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,255,509	1.47%	+71,955	Jun 30, 2026	carried, not yet filed for the newest quarter
12.1	Range Nuclear Renaissance Index ETF Fund S000083243 · Registered fund · May 31, 2026 EXCHANGE TRADED CONCEPTS TRUST, not summed	2,266,579	1.48%	+804,965	May 31, 2026	EXCHANGE TRADED CONCEPTS TRUST, not summed
13	AWM Investment Company, Inc. 13F CIK 1535264 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,581,490	1.03%	-543,006	Jun 30, 2026	carried, not yet filed for the newest quarter
14	BNP PARIBAS ASSET MANAGEMENT Holding S.A. 13F CIK 1520354 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	1,577,016	1.03%	+689,771	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Philadelphia Financial Management of San Francisco, LLC 13F CIK 1351407 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,343,007	0.88%	+694,666	Jun 30, 2026	carried, not yet filed for the newest quarter
16	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,255,393	0.82%	+5,877	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
17	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,162,320	0.76%	-414,093	Jun 30, 2026	carried, not yet filed for the newest quarter
18	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,115,391	0.73%	+138,221	Jun 30, 2026	carried, not yet filed for the newest quarter
19	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,007,214	0.66%	+69,691	Jun 30, 2026	carried, not yet filed for the newest quarter
19.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	58,929	0.04%	+3,624	Jun 30, 2026	Northern Funds, not summed
20	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	935,352	0.61%	+38,116	Jun 30, 2026	carried, not yet filed for the newest quarter
20.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	537,784	0.35%	+8,119	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
20.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	277,199	0.18%	+27,560	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
20.3	Schwab Total Stock Market Index Fund Fund S000005913 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	70,427	0.05%	-20,000	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
20.4	Schwab U.S. Broad Market ETF Fund S000026631 · Registered fund · May 31, 2026 SCHWAB STRATEGIC TRUST, not summed	66,473	0.04%	-14,042	May 31, 2026	SCHWAB STRATEGIC TRUST, not summed
21	BARCLAYS PLC 13F CIK 312069 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	847,781	0.55%	-165,175	Jun 30, 2026	carried, not yet filed for the newest quarter
22	American Beacon GLG Natural Resources ETF Fund S000083896 · Registered fund · Jul 31, 2026 AMERICAN BEACON SELECT FUNDS, not summed	839,371	0.55%	—	Jul 31, 2026	AMERICAN BEACON SELECT FUNDS, not summed
23	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	835,656	0.55%	+835,656	Jun 30, 2026	carried, not yet filed for the newest quarter
24	Man Group plc 13F CIK 1637460 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	828,377	0.54%	+828,377	Jun 30, 2026	carried, not yet filed for the newest quarter
25	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	788,561	0.51%	+35,245	Jun 30, 2026	carried, not yet filed for the newest quarter
26	Pacer Data & Infrastructure Real Estate ETF Fund S000061573 · Registered fund · Jul 31, 2026 Pacer Funds Trust, not summed	738,035	0.48%	+227,431	Jul 31, 2026	Pacer Funds Trust, not summed
27	Pacer Advisors, Inc. 13F CIK 1616667 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	734,960	0.48%	+231,035	Jun 30, 2026	carried, not yet filed for the newest quarter
28	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	709,057	0.46%	+540,060	Jun 30, 2026	carried, not yet filed for the newest quarter
29	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	705,153	0.46%	-352,187	Jun 30, 2026	carried, not yet filed for the newest quarter
30	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	584,502	0.38%	+125,907	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
31	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	576,276	0.38%	+49,481	Jun 30, 2026	carried, not yet filed for the newest quarter
31.1	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	8,685	0.01%	+3,962	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
32	WIM INVESTMENT MANAGEMENT Ltd 13F CIK 2042565 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	541,400	0.35%	-60,000	Jun 30, 2026	carried, not yet filed for the newest quarter
33	Diametric Capital, LP 13F CIK 1719087 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	538,517	0.35%	-414,988	Jun 30, 2026	carried, not yet filed for the newest quarter
34	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	493,421	0.32%	+285,979	Jun 30, 2026	carried, not yet filed for the newest quarter
34.1	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	275,656	0.18%	+211,865	Jul 31, 2026	TIAA-CREF Funds, not summed
34.2	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	154,067	0.10%	+18,147	Jul 31, 2026	TIAA-CREF Funds, not summed
34.3	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	31,660	0.02%	—	Jun 30, 2026	College Retirement Equities Fund, not summed
34.4	TIAA Separate Account VA-1 - Stock Index Account Fund S000005098 · Registered fund · Jun 30, 2026 TIAA Separate Account VA-1, not summed	1,604	0.00%	0	Jun 30, 2026	TIAA Separate Account VA-1, not summed
34.5	Nuveen Life Stock Index Fund Fund S000005094 · Registered fund · Jun 30, 2026 TIAA-CREF Life Funds, not summed	767	0.00%	0	Jun 30, 2026	TIAA-CREF Life Funds, not summed
35	GROUP ONE TRADING LLC 13F CIK 932540 · Broker-dealer · Jun 30, 2026 carried, not yet filed for the newest quarter	458,383	0.30%	-137,242	Jun 30, 2026	carried, not yet filed for the newest quarter
36	Shay Capital LLC 13F CIK 1723643 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	413,000	0.27%	-16,500	Jun 30, 2026	carried, not yet filed for the newest quarter
37	Rathbones Group PLC 13F CIK 1351991 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	381,619	0.25%	-4,947	Jun 30, 2026	carried, not yet filed for the newest quarter
38	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	357,591	0.23%	-410,415	Jun 30, 2026	carried, not yet filed for the newest quarter
39	Bank of New York Mellon Corp 13F CIK 1390777 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	356,872	0.23%	+67,863	Jun 30, 2026	carried, not yet filed for the newest quarter
40	Caprock Group, LLC 13F CIK 1610769 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	321,365	0.21%	+365	Jun 30, 2026	carried, not yet filed for the newest quarter
41	VANGUARD MATERIALS INDEX FUND Fund S000004441 · Registered fund · May 31, 2026 VANGUARD WORLD FUND, not summed	308,858	0.20%	+2,374	May 31, 2026	VANGUARD WORLD FUND, not summed
42	HITE Hedge Asset Management LLC 13F CIK 1568939 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	301,837	0.20%	-24,390	Jun 30, 2026	carried, not yet filed for the newest quarter
43	Chicago Partners Investment Group LLC 13F CIK 1563525 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	265,459	0.17%	-108,619	Jun 30, 2026	carried, not yet filed for the newest quarter
44	BANK OF MONTREAL /CAN/ 13F CIK 927971 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	262,560	0.17%	+30,787	Jun 30, 2026	carried, not yet filed for the newest quarter
45	Saba Capital Management, L.P. 13F CIK 1510281 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	261,470	0.17%	-96,155	Jun 30, 2026	carried, not yet filed for the newest quarter
46	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	241,054	0.16%	-32,408	Jun 30, 2026	carried, not yet filed for the newest quarter
47	Headlands Technologies LLC 13F CIK 1570271 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	240,197	0.16%	+165,031	Jun 30, 2026	carried, not yet filed for the newest quarter
48	Inspire Investing, LLC 13F CIK 1670139 · Registered investment adviser · Sep 30, 2026	236,320	0.15%	+236,320	Sep 30, 2026
49	Empowered Funds, LLC 13F CIK 1592828 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	225,089	0.15%	+39,136	Jun 30, 2026	carried, not yet filed for the newest quarter
50	DNB Asset Management AS 13F CIK 1456670 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	214,880	0.14%	+155,098	Jun 30, 2026	carried, not yet filed for the newest quarter

9 more nested rows are not shown here; Every filing lists them all.

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 240 holders

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Key facts CIK 1921865 CUSIP 00218A105 13F (30d) 20 filings 20 filers Visit website Investor relations