144 0001951275 XXXXXXXX LIVE 0001921865 ASP Isotopes Inc. 001-41555 2200 Ross Avenue Suite 4575E Dallas TX 75201 (214) 4328219 Ainscow Robert OFFICER Common Stock Independent Trading Group (ITG) Inc.

33 Yonge Street Suite 420 Toronto A6 M5E 1G4

25000 112000 125903447 04/13/2026 NASDAQ Common Stock 09/06/2024 Acquired as compensation --Restricted Stock Award Issuer N 300000 09/06/2024 Equity Compensation N Ainscow Robert

c/o ASP Isotopes Inc. 2200 Ross Avenue, Suite 4575E Dallas TX 75201

Common Stock 03/06/2026 8438 45894.28 The sale of shares reported in this Form 144 is expected to be sold on the date indicated pursuant to a Rule 10b5-1 trading plan. The Aggregate Market Value of the shares to be sold is based on the closing market price of $4.48 on April 10, 2026. 04/13/2026 12/13/2024 /s/ Robert Ainscow