AXCELIS TECHNOLOGIES INC — Director's Dealing 2025

Mar 4, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AXCELIS TECHNOLOGIES INC (ACLS)
CIK: 0001113232
Period of Report: 2025-02-28

Reporting Person: Tatnall Christopher (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-02-28	Common Stock	F	1146	$54.79	Disposed	13567	Direct

Footnotes

F1: This forfeiture of shares for tax withholding purposes relates to the vesting on February 28, 2025 of performance based restricted stock units ("2024 PRSUs") granted to the executive in May 2024. Of the 2024 PRSUs granted, 150% were determined to be earned by the executive pursuant to a resolution of the Axcelis Technologies, Inc. Compensation Committee on February 13, 2025, and half of the earned shares vested on February 28, 2025. As agreed with the executive, the shares issued to the executive on the vesting were reduced by a number of shares having a value equal to the executive's tax withholding obligation with respect to the vested 2024 PRSUs.

F2: Represents the closing price of the Company's common stock on February 28, 2025, the date of the tax withholding.

F3: Of the shares held as of February 28, 2025 after the vesting of the 2024 PRSUs, 10,629 were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.