[Form 4] AXCELIS TECHNOLOGIES INC Insider Trading Activity

Rhea-AI Filing Summary

Axcelis Technologies executive Greg Redinbo reported a forfeiture of 208 shares of common stock on 09/15/2025 for tax withholding related to the vesting of restricted stock units granted in September 2022. The withholding used the closing stock price on the transaction date, recorded as $87.3 per share. After the vesting and withholding, the reporting person beneficially owned 32,661 shares; 19,120 of those are issuable on vesting of RSUs under the 2012 Equity Incentive Plan and remain subject to forfeiture. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person.

Insights

Financial Analyst

TL;DR: Routine tax-withholding on vested RSUs reduced reported shares; no indication of discretionary sale or new cash proceeds.

The Form 4 discloses a common, administrative transaction: 208 shares were surrendered to satisfy tax withholding when RSUs vested. The price used, $87.3, is the closing market price on 09/15/2025 and defines the cash-equivalent tax obligation. Post-transaction beneficial ownership of 32,661 shares includes 19,120 RSUs still subject to forfeiture, which suggests a portion of equity compensation remains unvested or conditionally held. This filing does not show open-market purchases or sales beyond withholding, so it should be viewed as neutral from a trading-signal perspective.

Corporate Governance Expert

TL;DR: This is a standard vesting and tax-withholding disclosure; it reflects compensation mechanics rather than governance action.

The disclosure clarifies that the forfeiture was executed solely to meet tax obligations on vested RSUs granted in 2022. The continued presence of 19,120 RSUs subject to forfeiture indicates ongoing vesting conditions tied to the 2012 Equity Incentive Plan. The Form 4 is complete with signature by attorney-in-fact, meeting procedural requirements. There are no indications of exceptional governance events, insider intent to liquidate, or changes in officer role disclosed in this filing.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Redinbo Greg

(Last) (First) (Middle)

C/O AXCELIS TECHNOLOGIES, INC.

108 CHERRY HILL DRIVE

(Street)

BEVERLY MA 01915

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
AXCELIS TECHNOLOGIES INC [ ACLS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP MARKETING AND APPLICATIONS

3. Date of Earliest Transaction (Month/Day/Year)
09/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/15/2025		F		208	D(1)	$87.3(2)	32,661(3)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This forfeiture of shares for tax withholding purposes relates to the vesting on September 15, 2025 of service vesting restricted stock units granted to the executive in September 2022. 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 restricted stock units.

2. Represents the closing price of the common stock on the date of the tax withholding.

3. Of the shares held after this vesting event on September 15, 2025, 19,120 were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

	/s/ Eileen J. Evans, Attorney-in-Fact	09/17/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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