SCHEDULE 13G/A 0001477932-25-001068 0001744816 XXXXXXXX LIVE 1 Common Stock, $0.01 par value 12/31/2023 0001921865 ASP Isotopes Inc. 00218A105 601 PENNSYLVANIA AVENUE NW SOUTH BUILDING, SUITE 900 WASHINGTON DC 20004 Rule 13d-1(d) Mann Paul Elliot X0 6577199.00 0.00 6577199.00 0.00 6577199.00 11.9 IN Items 5, 7 and 9 - 5,805,643 shares of Common Stock held directly by Paul Mann and (2) 771,556 shares of Common Stock issuable upon the exercise of warrants exercisable within 60 days of December 31, 2023. Item 11 - This percentage calculation is based on 48,923,276 outstanding shares as of December 31, 2023. ASP Isotopes Inc. 601 PENNSYLVANIA AVENUE NW, SOUTH BUILDING, SUITE 900, WASHINGTON, DISTRICT OF COLUMBIA, 20004. Paul E. Mann 601 Pennsylvania Avenue NW, South Building, Suite 900, Washington DC 20004 United Kingdom N 6,577,199 shares 11.9 6,577,199 shares 0 6,577,199 shares 0 Y Y Y Y Y Mann Paul Elliot /s/ Paul E. Mann 02/14/2025