Mahoney Robert John 4

What Happened
Robert J. Mahoney, EVP Global Operations of Axcelis Technologies (ACLS), had 312 shares (182 + 130) withheld/surrendered to cover tax withholding for RSUs that vested on May 16, 2026. The withheld shares were valued at $146.24 each (182 × $146.24 = $26,616; 130 × $146.24 = $19,011), a total of $45,627. This was a forfeiture/withholding to satisfy tax obligations (transaction code F), not an open-market sale or purchase.

Key Details

• Transaction date: May 18, 2026; filing date: May 20, 2026 (timely Form 4 filing).
• Prices and amounts: 182 shares @ $146.24 = $26,616; 130 shares @ $146.24 = $19,011. F2 notes this is the closing price on the withholding date.
• Reason: F1 — shares were reduced to satisfy the executive's tax withholding obligation on RSUs that vested May 16, 2026.
• Post-vesting notes: F3 and F4 indicate that, after this vesting event, 12,846 and 12,578 shares (from different RSU grants) remain issuable on future vesting and are subject to forfeiture.
• Transaction code: F = tax withholding (share surrender), not an indication of a market sell.

Context
This was a routine cashless/withholding action tied to RSU vesting (company withheld shares to pay taxes). Such forfeitures are administrative and do not necessarily signal the insider selling shares on the open market or a change in sentiment.