Company · Ownership research

ASP Isotopes Inc. ASPI

CIK 0001921865 · CUSIP 00218A105

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 00218A105 (ASPI), not CUSIP 00218A905 (ASPI), CUSIP 00218A955 (ASPI), and does not merge CUSIPs.

This page lists the top 20 of 175 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$36.32M 6,789,417 shares	0.00%	+1.33M(+24.30%)Added	SEC filing ↗ Feb 12, 2026	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$34.27M 6,406,244 shares	0.00%	+1.89M(+41.80%)Added	SEC filing ↗ Jan 29, 2026	▾
03	Alyeska Investment Group, L.P. CIK 1453072 · View history	$26.19M 4,895,546 shares	0.07%	+2.07M(+73.40%)Added	SEC filing ↗ Feb 13, 2026	▾
04	Rovida Investment Management Ltd CIK 2053064 · View history	$21.89M 4,100,000 shares	2.98%	+900.00K(+28.10%)Added	SEC filing ↗ Feb 10, 2026	▾
05	UBS Group AG CIK 1610520 · View history	$12.87M 2,406,457 shares	0.00%	+1.45M(+150.30%)Added	SEC filing ↗ Jan 29, 2026	▾
06	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$12.76M 2,384,066 shares	0.00%	+521.61K(+28.00%)Added	SEC filing ↗ Feb 9, 2026	▾
07	AWM Investment Company, Inc. CIK 1535264 · View history	$11.37M 2,124,496 shares	1.10%	-834.10K(-28.20%)Reduced	SEC filing ↗ Feb 13, 2026	▾
08	STATE STREET CORP CIK 93751 · View history	$9.87M 1,844,405 shares	0.00%	+438.67K(+31.20%)Added	SEC filing ↗ Feb 13, 2026	▾
09	CITADEL ADVISORS LLC CIK 1423053 · View history	$9.23M 1,725,553 shares	0.01%	+559.79K(+48.00%)Added	SEC filing ↗ Feb 17, 2026	▾
10	GOLDMAN SACHS GROUP INC CIK 886982 · Amended · View history	$9.18M 1,715,292 shares	0.00%	+1.31M(+319.60%)Added	SEC filing ↗ Mar 25, 2026	▾
11	MORGAN STANLEY CIK 895421 · Amended · View history	$9.15M 1,709,783 shares	0.00%	+1.27M(+288.80%)Added	SEC filing ↗ May 27, 2026	▾
12	JANE STREET GROUP, LLC CIK 1595888 · View history	$8.49M 1,586,961 shares	0.01%	+368.24K(+30.20%)Added	SEC filing ↗ Feb 12, 2026	▾
13	SUSQUEHANNA INTERNATIONAL GROUP, LLP CIK 1446194 · View history	$8.11M 1,516,643 shares	0.01%	+174.86K(+13.00%)Added	SEC filing ↗ Feb 17, 2026	▾
14	EXCHANGE TRADED CONCEPTS, LLC CIK 1457320 · View history	$7.49M 1,400,314 shares	0.06%	+194.03K(+16.10%)Added	SEC filing ↗ Jan 14, 2026	▾
15	BNP PARIBAS ASSET MANAGEMENT Holding S.A. CIK 1520354 · View history	$5.05M 944,326 shares	0.01%	+280.39K(+42.20%)Added	SEC filing ↗ Feb 13, 2026	▾
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$4.74M 885,739 shares	0.00%	+223.78K(+33.80%)Added	SEC filing ↗ Feb 13, 2026	▾
17	Telemark Asset Management, LLC CIK 1420816 · View history	$4.41M 825,000 shares	0.44%	-500.00K(-37.70%)Reduced	SEC filing ↗ Feb 11, 2026	▾
18	MARSHALL WACE, LLP CIK 1318757 · View history	$4.38M 818,129 shares	0.00%	-460.99K(-36.00%)Reduced	SEC filing ↗ Feb 13, 2026	▾
19	NORTHERN TRUST CORP CIK 73124 · View history	$3.99M 745,909 shares	0.00%	+145.86K(+24.30%)Added	SEC filing ↗ Feb 17, 2026	▾
20	Diametric Capital, LP CIK 1719087 · View history	$3.94M 737,304 shares	1.06%	+381.62K(+107.30%)Added	SEC filing ↗ Feb 13, 2026	▾

Showing 20 / 175 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

175

Cancelled or null records excluded

Disclosed shares

58,564,838

Not deduplicated across managers

Disclosed value

$313.28M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

ASP Isotopes Inc. · Q4 2025

Explore all 175 reporting institutions.

This page includes 20 of 175 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.