Axcelis (ACLS) EVP Redinbo forfeits 723 shares for PRSU tax withholding

Rhea-AI Filing Summary

Axcelis Technologies executive Greg Redinbo reported a tax-related share disposition. On March 2, 2026, he forfeited 723 shares of Axcelis common stock at $86.58 per share to cover tax withholding arising from the February 28, 2026 vesting of performance-based 2024 PRSUs.

After this tax-withholding disposition, he directly holds 31,938 shares, including 16,984 shares issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan, which remain subject to forfeiture.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Redinbo Greg

Role EVP MARKETING AND APPLICATIONS

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	723	$86.58	$63K

Holdings After Transaction: Common Stock — 31,938 shares (Direct)

Footnotes (1)

1. This forfeiture of shares for tax withholding purposes relates to the vesting on February 28, 2026 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, with half of the earned shares vesting on February 28, 2025 and the remaining half of the earned shares vesting on February 28, 2026. 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. Represents the closing price of the Company's common stock on March 2, 2026, the date of the tax withholding. Of the shares held after the vesting of the remaining 2024 PRSUs, 16,984 were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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)
03/02/2026

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	03/02/2026		F		723	D(1)	$86.58(2)	31,938(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 February 28, 2026 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, with half of the earned shares vesting on February 28, 2025 and the remaining half of the earned shares vesting on February 28, 2026. 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.

2. Represents the closing price of the Company's common stock on March 2, 2026, the date of the tax withholding.

3. Of the shares held after the vesting of the remaining 2024 PRSUs, 16,984 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	03/03/2026
	** 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).
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FAQ

What did Axcelis (ACLS) executive Greg Redinbo report in this Form 4 filing?

Greg Redinbo reported a tax-withholding disposition of Axcelis common stock. He forfeited 723 shares to satisfy tax obligations triggered by the vesting of his 2024 performance-based restricted stock units, rather than making an open-market sale of shares.

How many Axcelis (ACLS) shares were forfeited and at what price?

Redinbo forfeited 723 shares of Axcelis common stock at $86.58 per share. The price used reflects the closing price on March 2, 2026, the date on which the tax-withholding related disposition occurred.

Why did Greg Redinbo’s Axcelis (ACLS) shares vest and trigger tax withholding?

The forfeiture relates to the vesting of 2024 performance-based RSUs granted in May 2024. The Compensation Committee determined 150% of the target units were earned, with half vesting on February 28, 2025 and the remaining half vesting on February 28, 2026.

How many Axcelis (ACLS) shares does Greg Redinbo hold after this Form 4 transaction?

Following the tax-withholding disposition, Redinbo directly holds 31,938 Axcelis shares. Of these, 16,984 shares are issuable upon future vesting of restricted stock units granted under the 2012 Equity Incentive Plan and remain subject to potential forfeiture.

Was this Axcelis (ACLS) Form 4 transaction an open-market sale by Greg Redinbo?

No, the transaction is a tax-withholding disposition coded as F, not an open-market sale. Shares were withheld and forfeited to cover Redinbo’s tax obligation on vested 2024 performance-based restricted stock units, rather than being sold on the market.