144 0002012446 XXXXXXXX LIVE 0001921865 ASP Isotopes Inc. 001-41555 601 Pennsylvania Avenue NW South Building, Suite 900 Washington DC 20004 2027562245 Gorley Michael DIRECTOR Common Stock Independent Trading Group (ITG) Inc.

33 Yonge Street Suite 420 Toronto AK ON M5E 1G4

64000 662400 91913109 09/30/2025 NASDAQ Common Stock 10/23/2023 Acquired as compensation -- Restricted Stock Award Issuer N 93458 10/23/2023 NA Y The sale of shares reported in this Form 144 includes an amount for the purpose of satisfying the Reporting Person's income tax liabilities resulting from the vesting of previously granted restricted stock awards pursuant to an issuer equity incentive plan. The Aggregate Market Value of the shares to be sold is based on the closing market price of $10.35 on September 29, 2025. 09/30/2025 /s/ Donald Ainscow, as attorney-in-fact for Michael Gorley