ASP Isotopes COO Robert Ainscow Sells 8,438 Shares Under 10b5-1 Plan

Robert Ainscow, Chief Operating Officer of ASP Isotopes Inc., sold 8,438 shares of common stock on June 8, 2026, at a weighted average price of $6.999 per share. The sale was executed pursuant to a Rule 10b5-1 trading plan adopted on June 9, 2025, and was designated as a "sell to cover" transaction to cover tax withholding obligations related to the vesting of restricted stock awards. The shares were sold in multiple transactions at prices ranging from $6.785 to $7.265. Following this transaction, Ainscow retains 2,281,879 shares of ASP Isotopes common stock. The filing was signed by Donald Ainscow as attorney-in-fact on June 10, 2026.