Axcelis EVP has 190 shares withheld for taxes

Axcelis Technologies executive Greg Redinbo reported routine tax-withholding transactions, not open-market trades.

Rhea-AI Filing Summary

Axcelis Technologies executive Greg Redinbo reported routine tax-withholding transactions, not open-market trades. On tax-withholding related to the May 16, 2026 vesting of restricted stock units granted in May 2022, 190 shares of common stock were forfeited at a price of $146.24 per share to cover his tax liability. Footnotes note that tens of thousands of 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: 190 shares

Exercise Price or Tax Liability 2 txns

Insider Redinbo Greg

Role EVP MARKETING AND APPLICATIONS

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	111	$146.24	$16K
Exercise Price or Tax Liability	Common Stock	79	$146.24	$12K

Holdings After Transaction: Common Stock — 35,024 shares (Direct)

Footnotes (4)

1. F1. This forfeiture of shares for tax withholding purposes relates to the vesting on May 16, 2026 of service vesting restricted stock units granted to the executive in May 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. 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 May 16, 2026, 20,756 were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.
4. F4. Of the shares held after this vesting event on May 16, 2026, 20,488 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

Tax-withholding shares: 190 shares First withholding lot: 79 shares Second withholding lot: 111 shares +5 more

8 metrics

Tax-withholding shares 190 shares Total shares forfeited for tax withholding on RSU vesting

First withholding lot 79 shares Common stock, tax-withholding disposition on May 18, 2026

Second withholding lot 111 shares Common stock, tax-withholding disposition on May 18, 2026

Share price for withholding $146.24 per share Closing price used to value tax-withheld shares

Shares following first transaction 35,024 shares Direct common stock holdings reported after one withholding entry

Shares following second transaction 35,103 shares Direct common stock holdings reported after another withholding entry

RSUs issuable after event (F3) 20,756 shares Shares issuable on future RSU vesting under 2012 Equity Incentive Plan

RSUs issuable after event (F4) 20,488 shares Alternate RSU tranche issuable, subject to forfeiture

Key Terms

restricted stock units, tax withholding, 2012 Equity Incentive Plan, forfeiture

4 terms

restricted stock units financial

"vesting on May 16, 2026 of service vesting restricted stock units granted to the executive"

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 on May 16, 2026"

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 and are subject to forfeiture"

forfeiture financial

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

FAQ

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

What insider transaction did Axcelis (ACLS) EVP Greg Redinbo report?

Greg Redinbo reported a tax-withholding disposition of Axcelis common stock. A total of 190 shares were forfeited to satisfy tax obligations tied to restricted stock units that vested on May 16, 2026, rather than being sold in the open market.

How many Axcelis (ACLS) shares were withheld for Greg Redinbo’s taxes?

A total of 190 Axcelis common shares were withheld for taxes. The Form 4 shows two transactions, one for 79 shares and another for 111 shares, both designated as tax-withholding related dispositions rather than discretionary sales.

At what price were Greg Redinbo’s Axcelis (ACLS) shares valued for tax withholding?

The withheld shares were valued at $146.24 per share. A footnote explains this price represents the closing price of Axcelis common stock on the tax-withholding date, which was used to determine the number of shares needed to cover the tax liability.

Was Greg Redinbo’s Axcelis (ACLS) Form 4 a market sale of stock?

No, the transactions were not open-market sales. Both entries are coded as “F,” indicating payment of tax liability by delivering shares. The filing describes these as forfeitures of shares for tax withholding tied to restricted stock unit vesting.

What is the source of the tax-withholding event for Axcelis (ACLS) EVP Greg Redinbo?

The tax withholding stems from restricted stock units granted in May 2022. Those service-vesting RSUs vested on May 16, 2026, and a portion of the resulting shares was withheld to cover Redinbo’s tax obligation associated with the vesting.

Does Greg Redinbo still have unvested Axcelis (ACLS) restricted stock units?

Yes, the footnotes indicate he still has substantial unvested restricted stock units. They state that tens of thousands of shares remain issuable upon future vesting under the 2012 Equity Incentive Plan and these potential shares are subject to forfeiture.

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

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Accepted by SEC EDGAR 05/20/2026 - 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^*

Redinbo Greg

(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 MARKETING AND APPLICATIONS

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/18/2026

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	05/18/2026		F		111	D(1)	$146.24(2)	35,103(3)	D
Common Stock	05/18/2026		F		79	D(1)	$146.24(2)	35,024(4)	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 May 16, 2026 of service vesting restricted stock units granted to the executive in May 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 May 16, 2026, 20,756 were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

4. Of the shares held after this vesting event on May 16, 2026, 20,488 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	05/20/2026
	** 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)