Form 4 Filing for AXCELIS TECHNOLOGIES INC

Gerald M. Blumenstock, EVP of Research, Development & Engineering at AXCELIS TECHNOLOGIES INC, reported a disposition of 506 shares of common stock on June 15, 2026. The shares were disposed of due to forfeiture for tax withholding purposes related to the vesting of restricted stock units granted in June 2023. The transaction code is "F" and the disposition code is "D". The price per share was $191.60, which was the closing price on the transaction date. Following this transaction, Mr. Blumenstock owns 19,987 shares, with 19,447 of these shares subject to forfeiture upon vesting of restricted stock units under the 2012 Equity Incentive Plan. This filing is a report of insider transactions.