X0609 4 2026-09-30-05:00 false 0001921865 ASP Isotopes Inc. ASPI 0002011790 Ryan Robert John Andrew false 2200 ROSS AVENUE SUITE 4575E DALLAS TX 75201 true false false false false Common Stock 2026-09-30-05:00 4 P false 15000 2.68 A 675222 D The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.65 to $2.68, inclusive. The reporting person undertakes to provide ASP Isotopes Inc. (the "Company"), any stockholder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/ Donald Ainscow, as attorney-in-fact 2026-10-01