ASP Isotopes Inc.

ASPI

Exchange: Nasdaq
Industry: Miscellaneous Chemical Products
SEC CIK: 0001921865

SEC filings (opens in a new tab)

In the last 90 days, ASP Isotopes Inc. insiders filed 0 open-market purchases and 8 sales; 185 institutions reported holding it in 13F filings for Q2 2026, worth $406.1M in total; no superinvestor holds it.

Q4 2025 vs. Q3 2025

How the institutions holding ASP Isotopes Inc. changed between Q3 2025 and Q4 2025.

All holders in Q4 2025 All holders in Q3 2025

13F holders of ASPI: Q3 2025 compared with Q4 2025
Measure	Q3 2025	Of which not filed for Q4 2025	Q4 2025	Change
Holders	157	2	173	+18
Shares	52.9M	27.0K	58.6M	+5.67M (+10.7%)
Value	$508.9M	$271.9K	$313.2M	−$195.4M (−38.4%)

2 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (49)

Institutions that held ASP Isotopes Inc. at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to ASPI in Q4 2025
Institution	Shares	Value	% of portfolio
Wim Investment Management Ltd	601,400	$3.22M	0.83%
HITE Hedge Asset Management LLC	449,883	$2.41M	0.15%
Pacer Advisors, Inc.	404,372	$2.16M	0.01%
Saba Capital Management, L.P.	356,377	$1.91M	0.06%
Burkehill Global Management, LP	250,000	$1.34M	0.09%
Swiss National Bank	210,100	$1.12M	0.00%
Arosa Capital Management LP	200,000	$1.07M	0.69%
VARCOV Co.	188,649	$1.01M	0.40%
Massar Capital Management, LP	147,376	$788.5K	0.16%
Empowered Funds, LLC	134,602	$720.1K	0.01%
UBS Asset Management Americas Inc	102,376	$547.7K	0.00%
SEI Investments Co	77,004	$412.0K	0.00%
Graham Capital Management, L.P.	66,998	$358.4K	0.01%
Quantinno Capital Management LP	56,776	$303.8K	0.00%
D. E. Shaw & Co., Inc.	54,037	$289.1K	0.00%
Resolute Capital Asset Partners LLC	50,000	$267.5K	0.13%
MH & Associates Securities Management Corp	48,666	$260.4K	0.21%
Atom Investors LP	44,661	$238.9K	0.02%
Janus Henderson Group PLC	39,000	$208.5K	0.00%
Axq Capital, LP	38,092	$203.8K	0.05%
Dark Forest Capital Management LP	30,737	$164.4K	0.01%
Raymond James Financial Inc	29,566	$158.2K	0.00%
Fortitude Advisory Group L.L.C.	25,995	$139.1K	0.06%
Zurcher Kantonalbank (Zurich Cantonalbank)	23,600	$126.3K	0.00%
Patriot Financial Group Insurance Agency, LLC	21,825	$116.8K	0.01%
Arizona State Retirement System	21,676	$116.0K	0.00%
Integrated Wealth Concepts LLC	18,508	$99.0K	0.00%
Tocqueville Asset Management L.P.	17,000	$91.0K	0.00%
KLP Kapitalforvaltning AS	16,700	$89.3K	0.00%
J.W. Cole Advisors, Inc.	16,663	$85.4K	0.00%
Atomi Financial Group, Inc.	15,334	$82.0K	0.00%
Inscription Capital, LLC	14,360	$76.8K	0.01%
Two Sigma Securities, LLC	14,275	$76.4K	0.01%
SummitTX Capital, L.P.	14,128	$75.6K	0.00%
Caption Management, LLC	13,800	$73.8K	0.00%
Steward Partners Investment Advisory, LLC	13,765	$73.6K	0.00%
Guggenheim Capital LLC	13,415	$71.8K	0.00%
Pictet Asset Management Holding SA	11,334	$60.6K	0.00%
Victory Capital Management Inc	11,234	$60.1K	0.00%
PEAK6 LLC	9,280	$49.6K	0.00%
IFP Advisors, Inc	9,000	$48.1K	0.00%
Bank of New Hampshire	2,000	$10.7K	0.00%
Hanson & Doremus Investment Management	1,000	$5.00K	0.00%
Strive Financial Group ,LLC	742	$3.97K	0.00%
Copia Wealth Management	730	$3.91K	0.00%
Larson Financial Group LLC	163	$872	0.00%
Quarry LP	34	$182	0.00%
Massmutual Trust Co FSB	17	$91	0.00%
Rothschild Investment LLC	6	$32	0.00%

Sold out (31)

Institutions that held ASP Isotopes Inc. at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of ASPI in Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Capital Research Global Investors	2,043,567	$19.7M
Philadelphia Financial Management of San Francisco, LLC	1,661,494	$16.0M
Driehaus Capital Management LLC	1,419,837	$13.7M
Jump Financial, LLC	940,500	$9.05M
Sara-Bay Financial	903,103	$8.69M
Encompass Capital Advisors LLC	500,000	$4.81M
Voloridge Investment Management, LLC	417,908	$4.02M
Millennium Management LLC	245,985	$2.37M
Concentric Capital Strategies, LP	218,054	$2.10M
Renaissance Technologies LLC	201,200	$1.94M
Baird Financial Group, Inc.	192,308	$1.85M
XTX Topco Ltd	139,782	$1.34M
Virtu Financial LLC	120,131	$1.16M
SPX Equities Gestao de Recursos Ltda	109,600	$1.05M
Alliancebernstein L.P.	98,870	$951.1K
EAM Investors, LLC	68,148	$655.6K
HRT Financial LP	54,714	$526.0K
Universal- Beteiligungs- und Servicegesellschaft mbH	45,000	$432.9K
Mariner, LLC	41,030	$394.7K
Omers Administration Corp	32,600	$313.6K
Belvedere Trading LLC	23,822	$229.2K
Flow Traders U.S. LLC	23,703	$228.0K
Point72 Asset Management, L.P.	23,371	$224.8K
GWM Advisors LLC	21,900	$210.7K
Sig Brokerage, LP	20,912	$201.2K
Once Capital Management, LLC	9,600	$92.4K
Clear Street Markets LLC	2,778	$26.7K
Bryn Mawr Trust Co	220	$2.12K
Rise Advisors, LLC	193	$1.86K
AdvisorNet Financial, Inc	120	$1.15K
US Bancorp	20	$192

Not filed for Q4 2025 yet (2)

Institutions that held ASP Isotopes Inc. at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding ASPI in Q3 2025 that haven't filed for Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Wolverine Trading, LLC	16,497	$170.7K
Cubist Systematic Strategies, LLC	10,512	$101.1K