Officer Sale of AXCELIS TECHNOLOGIES INC Stock

Eileen Evans, EVP, General Counsel and Secretary of AXCELIS TECHNOLOGIES INC, reported a sale of 926 shares of common stock on May 22, 2026, at a price of $155.5053 per share. Following this transaction, Ms. Evans owns 31,295 shares. A portion of these shares, specifically 29,823, were acquired through the vesting of restricted stock units under the 2012 Equity Incentive Plan and are subject to forfeiture. This filing is a Form 4, indicating a change in beneficial ownership.