JOHN T. KURTZWEIL - 20 May 2025 Form 4 Insider Report for AXCELIS TECHNOLOGIES INC (ACLS)

Role: Director
Signature: /s/ Eileen J. Evans, Attorney-in-Fact
Issuer symbol: ACLS
Transactions as of: 20 May 2025
Net transactions value: -$104,166
Form type: 4
Filing time: 21 May 2025, 17:05:08 UTC
Previous filing: 15 May 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
KURTZWEIL JOHN T	Director	C/O AXCELIS TECHNOLOGIES, INC., 108 CHERRY HILL DRIVE, BEVERLY	/s/ Eileen J. Evans, Attorney-in-Fact	21 May 2025	0001184588

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ACLS	Common Stock	Sale	$104,166	-1,682	-4.6%	$61.93	35,050	20 May 2025	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $61.72 to $62.22, inclusive. The reporting person undertakes to provide to Axcelis Technologies, Inc., any security holder of Axcelis Technologies, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.
F2	Of the shares held as of May 20, 2025, 3,586 were issuable on vesting of restricted stock units granted to the director under the 2012 Equity Incentive Plan and are subject to forfeiture.

Content

The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $61.72 to $62.22, inclusive. The reporting person undertakes to provide to Axcelis Technologies, Inc., any security holder of Axcelis Technologies, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Of the shares held as of May 20, 2025, 3,586 were issuable on vesting of restricted stock units granted to the director under the 2012 Equity Incentive Plan and are subject to forfeiture.