John T. Kurtzweil Sells 3,500 Shares of Axcelis Technologies Inc. Common Stock

On May 19, 2026, John T. Kurtzweil, a director at Axcelis Technologies Inc., sold 3,500 shares of common stock. The sale was executed at a weighted-average price of $138.7917 per share, with individual transactions ranging from $138.7600 to $139.1300. Following this transaction, Mr. Kurtzweil owns 32,990 shares of common stock. A portion of these post-transaction shares, specifically 1,440 shares, are subject to forfeiture as they were issued upon the vesting of restricted stock units granted under the 2012 Equity Incentive Plan. Mr. Kurtzweil has undertaken to provide full information regarding the specific prices of each sale upon request by the SEC staff. This transaction is reported on Form 4.