Tatnall Christopher 4

What Happened
Christopher Tatnall, EVP Global Customer Operations at Axcelis Technologies (ACLS), sold 1,166 shares in an open-market transaction on May 20, 2026. The shares were sold at $149.75 each for a total proceeds of approximately $174,609. This was a sale (disposition), not a purchase or exercise.

Key Details

• Transaction date: 2026-05-20 (reported on Form 4 filed 2026-05-21)
• Transaction type: Open market sale (code S)
• Price per share: $149.75; Shares sold: 1,166; Total value: $174,609
• Shares held after transaction: not fully specified in the filing; the filing notes 20,871 shares remaining are issuable upon vesting of restricted stock units and are subject to forfeiture (footnote)
• No 10b5-1 plan, tax-withholding, or other special handling disclosed in the provided data
• Filing appears timely (reported one day after the transaction)

Context
Sales by executives can be routine (cash needs, diversification, pre-set plans) and do not by themselves indicate company outlook. For retail investors, purchases can be more informative about insider confidence; this record documents a routine open-market sale and includes that a portion of the insider’s holdings are unvested RSUs subject to forfeiture.