Axcelis exec has 136 shares withheld for taxes

EVP Christopher Tatnall settled taxes via share withholding tied to RSU vesting at Axcelis Technologies, retaining 27,491 shares including unvested awards.

Rhea-AI Filing Summary

Axcelis Technologies Inc. (ACLS) reported that executive vice president of Global Customer Operations Christopher Tatnall had 136 shares of common stock withheld on September 15, 2026, to satisfy tax liabilities arising from the vesting of restricted stock units granted in September 2023. The shares were valued at the $105.04 closing price on that date. After this vesting event, Tatnall holds 27,491 shares directly, including 20,590 shares issuable upon future vesting of restricted stock units that remain subject to forfeiture.

Insider Trade Summary

Tax Withholding: 136 shares

Tax Withholding 1 txn

Insider Tatnall Christopher

Role EVP Global Customer Operations

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F2, F1, F3	136	$105.04	$14K

Holdings After Transaction: Common Stock — 27,491 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 2023. 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, 20,590 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: 136 shares Tax-withholding valuation price: $105.04 per share Shares held after transaction: 27,491 shares +2 more

5 metrics

Shares withheld for taxes 136 shares Withheld on September 15, 2026 to satisfy tax liability on RSU vesting

Tax-withholding valuation price $105.04 per share Closing price of Axcelis Technologies common stock on September 15, 2026

Shares held after transaction 27,491 shares Direct holdings of Christopher Tatnall following the vesting and tax withholding

Unvested RSUs subject to forfeiture 20,590 shares Shares issuable upon vesting of restricted stock units under the 2012 Equity Incentive Plan

Exercise price or tax-liability transactions 136 shares Total shares reported in code F transaction for tax withholding

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 granted"

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 and are subject"

FAQ

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

What insider transaction did ACLS executive Christopher Tatnall report on this Form 4?

Christopher Tatnall reported that 136 shares of Axcelis Technologies common stock were withheld on September 15, 2026 to pay tax liabilities from the vesting of previously granted restricted stock units, using the $105.04 closing price per share for the tax-withholding value.

Was the ACLS Form 4 transaction by Christopher Tatnall an open-market sale?

No. The Form 4 states the transaction was a payment of tax liability by delivering or withholding securities in connection with restricted stock unit vesting, not an open-market purchase or sale of Axcelis Technologies common stock.

How many ACLS shares does Christopher Tatnall hold after the reported transaction?

After the September 15, 2026 vesting and related tax withholding, Christopher Tatnall holds 27,491 Axcelis Technologies common shares directly, of which 20,590 are issuable upon future vesting of restricted stock units that are still subject to forfeiture.

What price was used to value the ACLS shares withheld for Christopher Tatnall’s taxes?

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

Is the ACLS Form 4 transaction by Christopher Tatnall under a Rule 10b5-1 trading plan?

No. The Form 4 indicates the Rule 10b5-1 checkbox is not checked, and the footnotes describe the transaction purely as tax withholding related to restricted stock unit vesting, without reference to a 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^*

Tatnall Christopher

(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 Global Customer Operations

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		136	D(1)	$105.04(2)	27,491(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 2023. 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, 20,590 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)