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 70 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	AWM Investment Company, Inc. CIK 1535264 · View history	$10.17M 3,659,586 shares	1.23%	+3.66MNew	SEC filing ↗ Nov 14, 2024	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$7.84M 2,820,757 shares	0.00%	+1.07M(+61.30%)Added	SEC filing ↗ Nov 13, 2024	▾
03	BlackRock, Inc. CIK 2012383 · View history	$7.51M 2,702,629 shares	0.00%	—	SEC filing ↗ Nov 13, 2024	▾
04	BNP PARIBAS ASSET MANAGEMENT Holding S.A. CIK 1520354 · View history	$6.25M 2,247,826 shares	0.02%	+2.25MNew	SEC filing ↗ Nov 8, 2024	▾
05	Telemark Asset Management, LLC CIK 1420816 · View history	$4.73M 1,700,000 shares	0.48%	+1.70MNew	SEC filing ↗ Nov 12, 2024	▾
06	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$3.11M 1,118,423 shares	0.00%	+334.84K(+42.70%)Added	SEC filing ↗ Nov 12, 2024	▾
07	MARSHALL WACE, LLP CIK 1318757 · View history	$2.78M 1,000,714 shares	0.00%	+455.64K(+83.60%)Added	SEC filing ↗ Nov 14, 2024	▾
08	Philadelphia Financial Management of San Francisco, LLC CIK 1351407 · View history	$2.76M 991,863 shares	0.59%	+607.89K(+158.30%)Added	SEC filing ↗ Nov 14, 2024	▾
09	STATE STREET CORP CIK 93751 · View history	$2.37M 853,695 shares	0.00%	+96.60K(+12.80%)Added	SEC filing ↗ Nov 14, 2024	▾
10	GSA CAPITAL PARTNERS LLP CIK 1362033 · View history	$2.14M 770,989 shares	0.16%	+377.72K(+96.00%)Added	SEC filing ↗ Nov 5, 2024	▾
11	Alyeska Investment Group, L.P. CIK 1453072 · View history	$2.08M 747,022 shares	0.01%	+747.02KNew	SEC filing ↗ Nov 14, 2024	▾
12	Rovida Advisors Inc. CIK 1653857 · View history	$1.11M 400,000 shares	0.35%	+50.00K(+14.30%)Added	SEC filing ↗ Nov 12, 2024	▾
13	NORTHERN TRUST CORP CIK 73124 · View history	$1.05M 377,163 shares	0.00%	+304.17K(+416.70%)Added	SEC filing ↗ Nov 13, 2024	▾
14	Diametric Capital, LP CIK 1719087 · View history	$811.67K 291,969 shares	0.40%	+291.97KNew	SEC filing ↗ Nov 13, 2024	▾
15	MMCAP International Inc. SPC CIK 1304857 · View history	$759.34K 273,143 shares	0.11%	+273.14KNew	SEC filing ↗ Nov 12, 2024	▾
16	Fiera Capital Corp CIK 1505817 · View history	$722.80K 260,000 shares	0.00%	+260.00KNew	SEC filing ↗ Nov 1, 2024	▾
17	MORGAN STANLEY CIK 895421 · Amended · View history	$663.47K 238,660 shares	0.00%	+107.94K(+82.60%)Added	SEC filing ↗ May 14, 2025	▾
18	Rathbones Group PLC CIK 1351991 · View history	$572.28K 205,855 shares	0.00%	+9.94K(+5.10%)Added	SEC filing ↗ Nov 13, 2024	▾
19	Walleye Capital LLC CIK 1758720 · View history	$535.61K 192,664 shares	0.01%	+192.66KNew	SEC filing ↗ Nov 14, 2024	▾
20	JANE STREET GROUP, LLC CIK 1595888 · View history	$405.79K 145,969 shares	0.00%	+35.17K(+31.70%)Added	SEC filing ↗ Nov 15, 2024	▾

Showing 20 / 70 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

22,396,324

Not deduplicated across managers

Disclosed value

$62.39M

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. · Q3 2024

Explore all 70 reporting institutions.

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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.