X0609 4 2026-05-28-05:00 false 0001921865 ASP Isotopes Inc. ASPI 0002026548 Kiessling Heather false C/O ASP ISOTOPES INC. 2200 ROSS AVENUE, SUITE 4575E DALLAS TX 75201 false true false false Chief Financial Officer false Common Stock 2026-05-28-05:00 4 A false 840000 A 1549376 D This award of common stock shall vest (subject to compliance with applicable vesting conditions) in semi-annual installments over a four-year period beginning on the grant date. /s/ Donald Ainscow, as attorney-in-fact 2026-06-03