Axcelis VP Corporate Controller Todd Sutton's RSU Transactions and Tax Withholdings

This Form 4 filing reports equity transactions by Todd Sutton, VP Corporate Controller of Axcelis Technologies Inc. On May 15, 2026, Sutton received a grant of 1,168 restricted stock units (RSUs) under the company's 2012 Equity Incentive Plan, which will vest in three equal annual installments starting May 15, 2027. The filing also reports three separate tax withholding transactions where Sutton disposed of shares to cover tax obligations related to the vesting of previously granted RSUs. Specifically, he sold 226 shares at $155.18 each for RSUs granted in May 2025, 112 shares at $155.18 for RSUs from May 2024, and 103 shares at $155.18 for RSUs from May 2023. These tax withholding transactions reduced his total holdings from 8,985 to 8,544 shares, with 5,207 of those shares being unvested RSUs subject to forfeiture. The filing provides detailed footnotes explaining each transaction and the vesting schedules.