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 133 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	Alyeska Investment Group, L.P. CIK 1453072 · View history	$30.76M 4,179,934 shares	0.11%	+4.18MNew	SEC filing ↗ Aug 14, 2025	▾
02	BlackRock, Inc. CIK 2012383 · View history	$29.65M 4,028,715 shares	0.00%	-22.36K(-0.60%)Reduced	SEC filing ↗ Aug 12, 2025	▾
03	AWM Investment Company, Inc. CIK 1535264 · View history	$28.93M 3,931,186 shares	3.26%	-580.00K(-12.90%)Reduced	SEC filing ↗ Aug 14, 2025	▾
04	VANGUARD GROUP INC CIK 102909 · View history	$24.11M 3,275,739 shares	0.00%	+187.69K(+6.10%)Added	SEC filing ↗ Aug 11, 2025	▾
05	Capital Research Global Investors CIK 1422848 · View history	$21.11M 2,868,062 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Aug 13, 2025	▾
06	Philadelphia Financial Management of San Francisco, LLC CIK 1351407 · View history	$19.65M 2,670,211 shares	4.36%	-837.85K(-23.90%)Reduced	SEC filing ↗ Aug 14, 2025	▾
07	Rovida Investment Management Ltd CIK 2053064 · View history	$16.15M 2,200,000 shares	2.99%	+1.85M(+528.60%)Added	SEC filing ↗ Aug 8, 2025	▾
08	BNP PARIBAS ASSET MANAGEMENT Holding S.A. CIK 1520354 · View history	$14.47M 1,965,484 shares	0.04%	-1.67M(-46.00%)Reduced	SEC filing ↗ Aug 6, 2025	▾
09	UBS Group AG CIK 1610520 · View history	$10.51M 1,428,276 shares	0.00%	+412.81K(+40.70%)Added	SEC filing ↗ Aug 14, 2025	▾
10	Telemark Asset Management, LLC CIK 1420816 · View history	$10.49M 1,425,000 shares	1.11%	-50.00K(-3.40%)Reduced	SEC filing ↗ Aug 12, 2025	▾
11	Driehaus Capital Management LLC CIK 938206 · View history	$10.34M 1,405,414 shares	0.08%	+1.41MNew	SEC filing ↗ Aug 14, 2025	▾
12	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$9.92M 1,348,072 shares	0.00%	+94.75K(+7.60%)Added	SEC filing ↗ Aug 8, 2025	▾
13	EXCHANGE TRADED CONCEPTS, LLC CIK 1457320 · View history	$9.59M 1,303,414 shares	0.12%	+1.30MNew	SEC filing ↗ Jul 10, 2025	▾
14	STATE STREET CORP CIK 93751 · View history	$8.20M 1,114,200 shares	0.00%	+66.86K(+6.40%)Added	SEC filing ↗ Aug 14, 2025	▾
15	GROUP ONE TRADING LLC CIK 932540 · View history	$5.20M 706,788 shares	0.17%	+437.16K(+162.10%)Added	SEC filing ↗ Aug 14, 2025	▾
16	Invesco Ltd. CIK 914208 · View history	$3.47M 471,219 shares	0.00%	+450.78K(+2,205.00%)Added	SEC filing ↗ Aug 13, 2025	▾
17	MORGAN STANLEY CIK 895421 · View history	$3.32M 451,329 shares	0.00%	+188.87K(+72.00%)Added	SEC filing ↗ Aug 14, 2025	▾
18	NORTHERN TRUST CORP CIK 73124 · View history	$3.19M 433,288 shares	0.00%	-27.44K(-6.00%)Reduced	SEC filing ↗ Aug 13, 2025	▾
19	GSA CAPITAL PARTNERS LLP CIK 1362033 · View history	$2.83M 384,326 shares	0.20%	-185.25K(-32.50%)Reduced	SEC filing ↗ Jul 22, 2025	▾
20	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$2.52M 342,912 shares	0.00%	+139.84K(+68.90%)Added	SEC filing ↗ Aug 14, 2025	▾

Showing 20 / 133 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

133

Cancelled or null records excluded

Disclosed shares

41,519,863

Not deduplicated across managers

Disclosed value

$305.55M

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. · Q2 2025

Explore all 133 reporting institutions.

This page includes 20 of 133 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.