Mahoney Robert John 4

What Happened
Robert John Mahoney, EVP Global Operations of Axcelis Technologies (ACLS), sold 2,258 shares in an open-market transaction on May 12, 2026. The shares were sold at $161.00 apiece for a total proceeds of $363,538. This was a sale (S) — routine insider selling, not a purchase or option exercise.

Key Details

• Transaction date: May 12, 2026 (reported on Form 4 filed May 13, 2026). Filing appears timely.
• Transaction type/code: Open-market sale (S).
• Shares sold: 2,258 at $161.00 per share; total proceeds $363,538.
• Shares owned after the sale: the filing notes that of the shares held after this sale, 10,927 shares were issuable on vesting of restricted stock units (RSUs) and remain subject to forfeiture.
• Footnote: The 10,927 RSUs include units earned upon achievement of 112.5% of the restricted stock units granted in 2025 based on 2025 performance goals.
• No indication in the filing of a 10b5-1 plan, tax-withholding disposition, or that this was an option exercise.

Context
Sales by executives can be routine (e.g., diversification, tax needs, or scheduled selling) and do not by themselves indicate company performance. Purchases generally carry more weight as a signal of insider confidence; this filing documents a straightforward open-market sale.