Axcelis EVP Redinbo has 208 shares withheld for tax

EVP and Chief Strategy Officer Greg Redinbo had shares withheld for taxes upon RSU vesting at Axcelis Technologies on September 15, 2026.

Rhea-AI Filing Summary

AXCELIS TECHNOLOGIES INC (ACLS) reported an insider equity tax-withholding transaction by EVP and Chief Strategy Officer Greg Redinbo. On September 15, 2026, 208 shares of common stock were withheld to pay tax liabilities arising from the vesting of restricted stock units granted in September 2022, using the $105.04 closing price that day. After this vesting event, Redinbo held 34,816 shares in total, including 19,782 shares issuable upon future vesting of restricted stock units under the 2012 Equity Incentive Plan that remain subject to forfeiture. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Tax Withholding: 208 shares

Tax Withholding 1 txn

Insider Redinbo Greg

Role EVP and Chief Strategy Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F2, F1, F3	208	$105.04	$22K

Holdings After Transaction: Common Stock — 34,816 shares (Direct)

Footnotes (3)

1. F1. This forfeiture of shares for tax withholding purposes relates to the vesting on September 15, 2026 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. 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 September 15, 2026, 19,782 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 tax: 208 shares Per-share value for tax withholding: $105.04 per share Shares held after transaction: 34,816 shares +1 more

4 metrics

Shares withheld for tax 208 shares Forfeited on September 15, 2026 to satisfy tax on RSU vesting

Per-share value for tax withholding $105.04 per share Closing price of common stock on September 15, 2026

Shares held after transaction 34,816 shares Direct holdings after September 15, 2026 vesting and tax withholding

Unvested RSU-linked shares 19,782 shares Issuable on vesting of restricted stock units under the 2012 Equity Incentive Plan, subject to forfeiture

Key Terms

restricted stock units, tax withholding, 2012 Equity Incentive Plan

3 terms

restricted stock units financial

"relates to the vesting on September 15, 2026 of service vesting restricted stock units"

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

"restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan"

FAQ

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

What insider transaction did ACLS executive Greg Redinbo report?

Greg Redinbo reported a withholding of 208 shares of Axcelis Technologies common stock on September 15, 2026, to cover tax liabilities associated with the vesting of previously granted restricted stock units.

Was the ACLS Form 4 transaction a market sale or a tax withholding?

The Form 4 transaction was a tax withholding disposition, where 208 shares were forfeited to satisfy the executive’s tax obligation on vested restricted stock units, not an open-market sale.

At what price were the withheld ACLS shares valued in the Form 4?

The 208 withheld shares were valued at $105.04 per share, which the company states was the closing price of Axcelis Technologies common stock on the date of the tax withholding, September 15, 2026.

How many ACLS shares does Greg Redinbo hold after this transaction?

After the September 15, 2026 event, Greg Redinbo holds 34,816 shares of Axcelis Technologies common stock, including shares from vested holdings and restricted stock units.

How many ACLS restricted stock units held by Greg Redinbo remain subject to forfeiture?

Following the vesting event, 19,782 shares are still issuable to Greg Redinbo upon vesting of restricted stock units under the 2012 Equity Incentive Plan, and these units remain subject to forfeiture.

Was the ACLS insider transaction under a Rule 10b5-1 trading plan?

No. The filing indicates the Rule 10b5-1 checkbox is not affirmed, and the footnotes describe a tax withholding related to RSU vesting rather than a pre-arranged trading plan.

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

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Available on EDGAR 09/16/2026 - 05:05 PM Accepted by SEC EDGAR 09/16/2026 - 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^*

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 and Chief Strategy Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/15/2026

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	09/15/2026		F		208	D(1)	$105.04(2)	34,816(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, 2026 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, 2026, 19,782 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	09/16/2026
	** 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)