Axcelis EVP has 506 shares withheld for taxes

AXCELIS TECHNOLOGIES INC executive Gerald M. Blumenstock had 506 common shares withheld for taxes tied to vesting restricted stock units.

Rhea-AI Filing Summary

AXCELIS TECHNOLOGIES INC executive Gerald M. Blumenstock had 506 common shares withheld for taxes tied to vesting restricted stock units. On June 15, 2026, shares from RSUs granted in June 2023 vested, and part of the issued shares was forfeited to satisfy his tax withholding obligation.

After this tax-withholding disposition, he directly holds 19,987 common shares. Footnotes state that 19,447 additional shares are issuable upon future vesting of restricted stock units under the 2012 Equity Incentive Plan and remain subject to forfeiture.

Insider Trade Summary

Exercise Price or Tax Liability: 506 shares

Exercise Price or Tax Liability 1 txn

Insider Blumenstock Gerald M

Role EVP, Research, Dev. & Eng.

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	506	$191.60	$97K

Holdings After Transaction: Common Stock — 19,987 shares (Direct)

Footnotes (3)

1. F1. This forfeiture of shares for tax withholding purposes relates to the vesting on June 15, 2026 of service vesting restricted stock units granted to the executive in June 2023. The shares issued to the executive following 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. F2. Represents the closing price of the common stock on the date of the tax withholding.
3. F3. Of the shares held after this vesting event on June 15, 2026, 19,447 shares are issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

Key Figures

Tax-withholding shares: 506 shares Withholding reference price: $191.60 per share Shares held after transaction: 19,987 shares +2 more

5 metrics

Tax-withholding shares 506 shares Common stock withheld for taxes on June 15, 2026

Withholding reference price $191.60 per share Closing price on the tax-withholding date

Shares held after transaction 19,987 shares Direct common stock holdings after tax withholding

Unvested RSU-linked shares 19,447 shares Issuable upon vesting under the 2012 Equity Incentive Plan

RSU vesting date June 15, 2026 Service-vesting restricted stock units granted June 2023

Key Terms

restricted stock units, tax withholding, 2012 Equity Incentive Plan, closing price

4 terms

restricted stock units financial

"This forfeiture of shares for tax withholding purposes relates to the vesting on June 15, 2026 of service vesting restricted stock units granted to the executive in June 2023."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding financial

"The shares issued to the executive following 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."

Tax withholding is the practice of taking a portion of a payment—such as wages, dividends, or sale proceeds—before it reaches the recipient and sending that portion to the tax authority as an advance on the recipient’s eventual tax bill. For investors it matters because withholding reduces immediate cash received and affects after‑tax returns, estimated tax payments, and whether you may owe more or receive a refund when taxes are finally calculated, like having a small automatic savings set aside for your tax bill.

2012 Equity Incentive Plan financial

"19,447 shares are issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture."

closing price financial

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

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Axcelis (ACLS) EVP Gerald Blumenstock report in this Form 4?

Gerald Blumenstock reported a tax-withholding disposition of 506 Axcelis common shares. These shares were withheld when restricted stock units vested, reducing the shares delivered to him while satisfying his tax obligation on the vested equity award.

Was the Axcelis (ACLS) insider transaction an open-market sale?

No, the transaction was not an open-market sale. It was a tax-withholding disposition, where 506 vested shares were forfeited back to cover taxes, a routine mechanism when restricted stock units vest for executives.

How many Axcelis (ACLS) shares does Gerald Blumenstock hold after this event?

Following the tax-withholding transaction, Gerald Blumenstock directly holds 19,987 Axcelis common shares. This figure reflects his position after 506 shares were used to cover tax obligations related to vesting restricted stock units.

What role did restricted stock units play in this Axcelis (ACLS) Form 4?

The Form 4 centers on restricted stock units granted in June 2023 that vested on June 15, 2026. Shares issued from those RSUs were partially forfeited, with 506 shares withheld to satisfy Blumenstock’s tax liability on the vested award.

Does Gerald Blumenstock still have unvested Axcelis (ACLS) equity after this filing?

Yes. Footnotes state that 19,447 shares are still issuable to him upon future vesting of restricted stock units under the 2012 Equity Incentive Plan, and those potential shares remain subject to forfeiture conditions.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/16/2026 - 05:05 PM Learn about SEC filing dates

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
Estimated average burden
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^*

Blumenstock Gerald M

(Last) (First) (Middle)

C/O AXCELIS TECHNOLOGIES, INC.

108 CHERRY HILL DRIVE

(Street)

BEVERLY MASSACHUSETTS 01915

(City) (State) (Zip)

UNITED STATES

(Country)

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, Research, Dev. & Eng.

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/15/2026

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

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

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

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	06/15/2026		F		506	D(1)	$191.6(2)	19,987(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 June 15, 2026 of service vesting restricted stock units granted to the executive in June 2023. The shares issued to the executive following 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 June 15, 2026, 19,447 shares are 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	06/16/2026
	** 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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)