Axcelis (ACLS) EVP sells shares, retains 12,759-share stake

Filing Impact

(Moderate)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Axcelis Technologies EVP Global Operations Robert John Mahoney reported an open-market sale of 2,258 shares of Axcelis common stock on May 12, 2026 at a price of $161.00 per share. After this sale, he directly holds 12,759 shares. A footnote explains that 10,927 of these shares are issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan and remain subject to forfeiture, including units earned at 112.5% of a 2025 grant based on 2025 performance goals.

Insider Trade Summary

Net Seller: 2,258 shares ($363,538)

Net Sell 1 txn

Insider Mahoney Robert John

Role EVP Global Operations

Sold 2,258 shs ($364K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,258	$161.00	$364K

Holdings After Transaction: Common Stock — 12,759 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 2,258 shares Sale price: $161.00 per share Shares held after transaction: 12,759 shares +2 more

5 metrics

Shares sold 2,258 shares Open-market sale on May 12, 2026

Sale price $161.00 per share Open-market sale of common stock

Shares held after transaction 12,759 shares Direct holdings following May 12, 2026 sale

RSU-related shares 10,927 shares Issuable upon vesting of restricted stock units, subject to forfeiture

Performance RSU achievement 112.5% Restricted stock units earned based on 2025 performance goals

Key Terms

restricted stock units, 2012 Equity Incentive Plan, subject to forfeiture, performance goals, +1 more

5 terms

restricted stock units financial

"10,927 shares were issuable on vesting of 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.

2012 Equity Incentive Plan financial

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

subject to forfeiture financial

"restricted stock units granted to the reporting person ... and are subject to forfeiture"

performance goals financial

"based upon the achievement of 2025 performance goals"

Performance goals are specific, measurable targets a company sets for financial results, operational milestones, or individual roles—examples include revenue, profit, production levels, or completion of a project. They matter to investors because meeting or missing these targets influences management pay, future forecasts, deal-related payments and market confidence; think of them as a scoreboard that helps outsiders judge whether the business is performing as promised.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 Insider Transactions: What Each Field Means →

05/13/2026 - 05:05 PM

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^*

Mahoney Robert John

(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)
	EVP Global Operations

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/12/2026		S		2,258	D	$161	12,759⁽¹⁾	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Of the shares held after this sale on May 12, 2026, 10,927 shares were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture. This amount includes restricted stock units earned by the reporting person upon the achievement of 112.5% of the restricted stock units granted in 2025 based upon the achievement of 2025 performance goals.

	/s/ Eileen J. Evans, Attorney-in-Fact	05/13/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Axcelis (ACLS) report for Robert John Mahoney?

Axcelis reported that EVP Global Operations Robert John Mahoney sold 2,258 shares of common stock. The sale occurred on May 12, 2026, as an open-market transaction at $161.00 per share, according to the Form 4 filing.

At what price did the Axcelis (ACLS) executive sell his shares?

The shares were sold at $161.00 per share. This price applied to 2,258 shares of Axcelis common stock sold by EVP Global Operations Robert John Mahoney on May 12, 2026, in an open-market transaction disclosed in the Form 4.

How many Axcelis (ACLS) shares does Robert John Mahoney hold after the sale?

After the sale, Robert John Mahoney directly holds 12,759 shares of Axcelis common stock. A significant portion of this amount, 10,927 shares, is tied to restricted stock units that must vest and can be forfeited under plan terms.

What portion of the Axcelis (ACLS) executive’s holdings are restricted stock units?

Of the 12,759 shares reported after the sale, 10,927 shares are issuable upon vesting of restricted stock units. These awards were granted under the 2012 Equity Incentive Plan and are subject to forfeiture, reflecting performance-based and time-based vesting conditions.

Were performance goals mentioned for the Axcelis (ACLS) restricted stock units?

Yes. The filing notes that the total restricted stock units include awards earned at 112.5% of the 2025 grant. That level was achieved based on Axcelis’s 2025 performance goals, indicating a performance-based component to Mahoney’s equity compensation.

What role does Robert John Mahoney hold at Axcelis (ACLS)?

Robert John Mahoney serves as Executive Vice President, Global Operations at Axcelis Technologies. His position and related equity awards under the 2012 Equity Incentive Plan are disclosed in the Form 4 insider trading report covering his May 12, 2026 share sale.