Tatnall Christopher 4

What Happened
Christopher Tatnall, EVP Global Customer Operations at Axcelis Technologies (ACLS), had 907 shares withheld/forfeited on April 20, 2026 to satisfy tax withholding on restricted stock units that vested April 18, 2026. The withheld shares were valued at $131.02 each, totaling $118,835. This was a tax-withholding transaction (code F), not an open-market sale.

Key Details

• Transaction date: 2026-04-20; Price used for withholding: $131.02 (closing price on the withholding date).
• Shares forfeited/withheld for taxes: 907 — proceeds/value: $118,835.
• Reason: Tax withholding related to vesting of service-based RSUs granted in April 2022 (vested April 18, 2026). (Footnote F1)
• Shares/RSUs after vesting: of the shares held after the April 18 vesting, 16,463 were issuable on vesting of RSUs under the 2012 plan and remain subject to forfeiture; this includes RSUs earned at 112.5% for 2025 performance (Footnote F3).
• Filing: Report filed April 21, 2026 for a transaction on April 20, 2026 (no late filing indicated).

Context

• This was a routine tax-withholding (cashless/stock-surrender) to satisfy payroll/tax obligations on vested RSUs, not an indication of an open-market sale or directional view.
• Footnote F3 notes some of the remaining RSUs are performance-based (including an above-target payout component for 2025).