Blumenstock Gerald M 4

What Happened

• Gerald M. Blumenstock, EVP, Research, Development & Engineering at Axcelis Technologies (ACLS), sold 1,161 shares in an open-market transaction on May 21, 2026. The shares were sold at $152.70 each, for a total proceeds of approximately $177,285. This was a sale (not a purchase or option exercise).

Key Details

• Transaction date and price: May 21, 2026 — 1,161 shares sold at $152.70 per share (total ≈ $177,285).
• Transaction type/code: Open-market sale (S).
• Shares held after the sale: The filing notes that, of the shares held after this sale, 20,493 shares were issuable upon vesting of restricted stock units (RSUs) granted under the 2012 Equity Incentive Plan and are subject to forfeiture.
• Filing timeliness: Report covers period 2026-05-21 and was filed 2026-05-22 (filed promptly).

Context

• This filing documents a routine insider sale. Sales can be for many personal or portfolio reasons and do not by themselves indicate company performance or management view. There is no indication in the filing of an option exercise, gift, or 10b5-1 plan tied to this transaction.