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 179 rows by value; the complete set is available through the API.

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	$36.81M 8,328,144 shares	0.00%	+1.54M(+22.70%)Added	SEC filing ↗ May 13, 2026	▾
02	Encompass Capital Advisors LLC CIK 1541901 · View history	$30.55M 6,912,054 shares	1.25%	+6.91MNew	SEC filing ↗ May 15, 2026	▾
03	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$22.37M 5,060,464 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
04	Rovida Investment Management Ltd CIK 2053064 · View history	$18.08M 4,100,000 shares	2.27%	0(0.00%)Unchanged	SEC filing ↗ May 19, 2026	▾
05	UBS Group AG CIK 1610520 · View history	$12.56M 2,841,709 shares	0.00%	+435.25K(+18.10%)Added	SEC filing ↗ May 5, 2026	▾
06	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$12.12M 2,740,464 shares	0.00%	+356.40K(+14.90%)Added	SEC filing ↗ May 15, 2026	▾
07	Alyeska Investment Group, L.P. CIK 1453072 · View history	$11.90M 2,692,166 shares	0.03%	-2.20M(-45.00%)Reduced	SEC filing ↗ May 15, 2026	▾
08	STATE STREET CORP CIK 93751 · View history	$10.26M 2,322,159 shares	0.00%	+477.75K(+25.90%)Added	SEC filing ↗ May 15, 2026	▾
09	EXCHANGE TRADED CONCEPTS, LLC CIK 1457320 · View history	$9.65M 2,183,554 shares	0.07%	+783.24K(+55.90%)Added	SEC filing ↗ Apr 15, 2026	▾
10	AWM Investment Company, Inc. CIK 1535264 · View history	$9.39M 2,124,496 shares	1.04%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
11	MORGAN STANLEY CIK 895421 · View history	$6.97M 1,576,413 shares	0.00%	-133.37K(-7.80%)Reduced	SEC filing ↗ May 15, 2026	▾
12	SUSQUEHANNA INTERNATIONAL GROUP, LLP CIK 1446194 · View history	$4.67M 1,057,340 shares	0.01%	-459.30K(-30.30%)Reduced	SEC filing ↗ May 15, 2026	▾
13	BARCLAYS PLC CIK 312069 · View history	$4.48M 1,012,956 shares	0.00%	+506.17K(+99.90%)Added	SEC filing ↗ May 15, 2026	▾
14	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$4.32M 977,170 shares	0.00%	—	SEC filing ↗ May 8, 2026	▾
15	Diametric Capital, LP CIK 1719087 · View history	$4.21M 953,505 shares	1.10%	+216.20K(+29.30%)Added	SEC filing ↗ May 15, 2026	▾
16	NORTHERN TRUST CORP CIK 73124 · View history	$4.14M 937,523 shares	0.00%	+191.61K(+25.70%)Added	SEC filing ↗ May 14, 2026	▾
17	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$3.97M 897,236 shares	0.00%	+11.50K(+1.30%)Added	SEC filing ↗ May 15, 2026	▾
18	BNP PARIBAS ASSET MANAGEMENT Holding S.A. CIK 1520354 · View history	$3.92M 887,245 shares	0.00%	-57.08K(-6.00%)Reduced	SEC filing ↗ May 14, 2026	▾
19	CITADEL ADVISORS LLC CIK 1423053 · View history	$3.39M 768,006 shares	0.00%	-957.55K(-55.50%)Reduced	SEC filing ↗ May 15, 2026	▾
20	VANGUARD FIDUCIARY TRUST CO CIK 933478 · Amended · View history	$3.33M 753,316 shares	0.00%	—	SEC filing ↗ May 8, 2026	▾

Showing 20 / 179 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

179

Cancelled or null records excluded

Disclosed shares

63,848,376

Not deduplicated across managers

Disclosed value

$282.54M

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. · Q1 2026

Explore all 179 reporting institutions.

This page includes 20 of 179 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.