Tatnall Christopher 4

What Happened
Christopher Tatnall, EVP Global Customer Operations at Axcelis Technologies (ACLS), had 1,121 shares forfeited on March 2, 2026 to satisfy tax withholding tied to the February 28, 2026 vesting of performance-based restricted stock units (2024 PRSUs). The shares were valued at $86.58 each (closing price on March 2, 2026) for a total value of $97,056. The filing reports the transaction as code F — payment of exercise price or tax liability (share withholding).

Key Details

• Transaction date: March 2, 2026 (filed March 3, 2026; filing appears timely).
• Shares forfeited/surrendered: 1,121 at $86.58 per share; total value reported $97,056 (F2 = closing price).
• Transaction code: F (payment of tax liability via share forfeiture).
• Footnote summary:
  • F1: Forfeiture was to cover tax withholding on 2024 PRSUs granted May 2024; 150% of the target award was determined earned, with half vested 2/28/2025 and the remainder vested 2/28/2026.
  • F3: After the vesting, the filing notes that 17,570 shares remain issuable on vesting of other restricted stock units held by the reporting person and are subject to forfeiture.
• Filing timeliness: Reported the day after the transaction (no late-filing flag indicated).
• The filing does not provide a total post-transaction share count for the reporting person.

Context
This was a routine share withholding to cover tax obligations on vested PRSUs (a common practice), not an open‑market sale intended to realize gains. Such withholding is administrative and should not be read as an insider purchase or a directional signal about the company.