Axcelis Technologies SVP Interim CFO David Ryzhik Restricted Stock Unit Transactions

This Form 4 filing reports equity transactions by David Ryzhik, SVP Interim CFO of Axcelis Technologies Inc. On May 15, 2026, Ryzhik received a grant of 3,115 restricted stock units (RSUs) under the company's 2012 Equity Incentive Plan with a zero cost basis. These RSUs will vest in three equal annual installments on May 15, 2027, 2028, and 2029, contingent on continued employment. Additionally, 226 shares were withheld for tax purposes related to the vesting of previously granted RSUs from May 2025, with the withholding based on the closing stock price of $155.18 per share. Following these transactions, Ryzhik's total holdings increased to 10,257 shares, with 9,464 of those shares subject to forfeiture until vesting. The filing demonstrates ongoing equity compensation for key executives and standard tax withholding procedures for vested equity awards.