Axcelis (ACLS) SVP Interim CFO reports RSU tax-withholding share disposition

Rhea-AI Filing Summary

Axcelis Technologies SVP and Interim CFO David Ryzhik reported a routine tax-withholding share disposition tied to equity compensation. On June 16, 2026, 76 shares of common stock were withheld at a price of $176.845 per share to cover taxes on vesting restricted stock units granted in June 2025.

After this vesting event, Ryzhik directly held 9,955 shares, including 8,439 shares issuable upon future vesting of restricted stock units under the 2012 Equity Incentive Plan that remain subject to forfeiture. The transaction reflects tax withholding rather than an open-market sale.

Insights

Equity compensation analyst

Routine tax withholding on RSU vesting; no open-market selling.

The filing shows David Ryzhik, SVP and Interim CFO of Axcelis Technologies, had 76 shares of common stock withheld on June 16, 2026 at $176.845 per share. Footnotes state this relates to vesting of service-based restricted stock units granted in June 2025.

This is coded as an F transaction, meaning a tax-withholding disposition, not a discretionary market sale. After settlement, Ryzhik held 9,955 shares directly, of which 8,439 are still tied to unvested restricted stock units and remain subject to forfeiture.

Because the transaction is purely for tax obligations and small relative to the reported holdings, it is best viewed as part of normal equity compensation mechanics rather than a signal about the executive’s view of the stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Ryzhik David

Role SVP Interim CFO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	76	$176.845	$13K

Holdings After Transaction: Common Stock — 9,955 shares (Direct, null)

Footnotes (1)

1. This forfeiture of shares for tax withholding purposes relates to the vesting on June 16, 2026 of service vesting restricted stock units granted to the executive in June 2025. 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. Represents the closing price of the common stock on the date of the tax withholding. Of the shares held after this vesting event on June 16, 2026, 8,439 were 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

Shares withheld for taxes: 76 shares Withholding price: $176.845 per share Shares held after transaction: 9,955 shares +1 more

4 metrics

Shares withheld for taxes 76 shares Tax-withholding disposition on June 16, 2026

Withholding price $176.845 per share Closing price on tax-withholding date

Shares held after transaction 9,955 shares Direct holdings after June 16, 2026 vesting

Unvested RSU-related shares 8,439 shares Issuable upon future vesting; subject to forfeiture

Key Terms

restricted stock units, tax withholding, 2012 Equity Incentive Plan

3 terms

restricted stock units financial

"service vesting restricted stock units granted to the executive in June 2025"

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

"forfeiture of shares for tax withholding purposes relates to the vesting"

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

"granted to the reporting person under the 2012 Equity Incentive Plan"

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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
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^*

Ryzhik David

(Last) (First) (Middle)

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)
	SVP Interim CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/16/2026

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	06/16/2026		F		76	D(1)	$176.845(2)	9,955(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 16, 2026 of service vesting restricted stock units granted to the executive in June 2025. 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 June 16, 2026, 8,439 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	06/17/2026
	** 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)

FAQ

What insider transaction did Axcelis Technologies (ACLS) report for David Ryzhik?

Axcelis Technologies reported that SVP and Interim CFO David Ryzhik had 76 shares of common stock withheld on June 16, 2026. This disposition covered tax obligations arising from the vesting of previously granted restricted stock units, rather than reflecting an open-market sale of shares.

Was the Axcelis (ACLS) insider transaction a sale of shares on the open market?

No, the transaction was not an open-market sale. The Form 4 shows an F-code tax-withholding disposition, where 76 shares were forfeited to satisfy taxes due when restricted stock units vested, according to the filing’s explanatory footnotes.

How many Axcelis (ACLS) shares does David Ryzhik hold after the reported transaction?

After the June 16, 2026 tax-withholding event, David Ryzhik held 9,955 shares of Axcelis common stock directly. Footnotes state that 8,439 of these are issuable upon future vesting of restricted stock units and remain subject to possible forfeiture under the equity plan.

What price was used for the Axcelis (ACLS) tax-withholding shares on the Form 4?

The Form 4 reports a price of $176.845 per share for the 76 withheld shares. A footnote explains this figure represents the closing price of Axcelis common stock on the June 16, 2026 tax-withholding date associated with the restricted stock unit vesting.

What equity awards are involved in this Axcelis (ACLS) insider filing?

The filing relates to service-vesting restricted stock units granted in June 2025 under Axcelis’s 2012 Equity Incentive Plan. On June 16, 2026, those units vested, triggering share issuance and a 76-share forfeiture to cover the executive’s tax withholding obligation on the vested units.

Are the remaining Axcelis (ACLS) restricted stock units for David Ryzhik fully owned?

No, the remaining restricted stock units are not fully unrestricted. The Form 4 footnotes indicate 8,439 shares are still issuable upon vesting of outstanding restricted stock units and remain subject to forfeiture based on the terms of the 2012 Equity Incentive Plan.