Axcelis (ACLS) director John Kurtzweil sells 3,500 shares, keeps 32,990 stake

Rhea-AI Filing Summary

Axcelis Technologies director John T. Kurtzweil reported an open-market sale of 3,500 shares of common stock on May 19, 2026 at a weighted-average price of $138.7917 per share. After the sale, he directly holds 32,990 shares, including 1,440 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.

Insights

Equity compensation and insider-trading analyst

Director executes a modest open-market sale and retains a sizable equity stake.

Director John T. Kurtzweil sold 3,500 shares of Axcelis Technologies common stock in an open-market transaction at a weighted-average price of $138.7917. The sale was executed across multiple trades within a narrow price range of $138.7600 to $139.1300.

Following this transaction, he directly holds 32,990 shares, which includes 1,440 shares issuable upon vesting of restricted stock units under the 2012 Equity Incentive Plan that are still subject to forfeiture. With no derivative positions reported, this looks like a routine partial sale while maintaining meaningful exposure.

Insider Trade Summary

Net Seller: 3,500 shares ($485,771)

Net Sell 1 txn

Insider KURTZWEIL JOHN T

Role null

Sold 3,500 shs ($486K)

Type	Security	Shares	Price	Value
Sale	Common Stock	3,500	$138.7917	$486K

Holdings After Transaction: Common Stock — 32,990 shares (Direct, null)

Footnotes (1)

1. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $138.7600 to $139.1300, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price. Of the shares held after this sale on May 19, 2026, 1,440 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.

Key Figures

Shares sold: 3,500 shares Weighted-average sale price: $138.7917 per share Post-transaction holdings: 32,990 shares +2 more

5 metrics

Shares sold 3,500 shares Open-market sale on May 19, 2026

Weighted-average sale price $138.7917 per share Common stock sale

Post-transaction holdings 32,990 shares Direct ownership after sale

RSU-linked shares 1,440 shares Issuable upon vesting; subject to forfeiture

Price range of trades $138.7600–$139.1300 Multiple transactions during sale

Key Terms

weighted-average price, restricted stock units, 2012 Equity Incentive Plan, open-market sale

4 terms

weighted-average price financial

"The price reported in Column 4 is a weighted-average price."

restricted stock units financial

"1,440 shares were issuable on vesting of restricted stock units granted to the reporting person"

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"

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 →

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^*

KURTZWEIL JOHN T

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/19/2026

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	05/19/2026		S		3,500	D	$138.7917(1)	32,990(2)	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. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $138.7600 to $139.1300, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

2. Of the shares held after this sale on May 19, 2026, 1,440 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.

	/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)

FAQ

How many Axcelis Technologies (ACLS) shares did John T. Kurtzweil sell?

Director John T. Kurtzweil sold 3,500 shares of Axcelis Technologies common stock. The transaction was an open-market sale, meaning the shares were sold through standard market trading rather than a private agreement or option exercise.

What price did John T. Kurtzweil receive for his Axcelis (ACLS) share sale?

He received a weighted-average price of $138.7917 per share. According to the disclosure, the shares were sold in multiple transactions, with individual prices ranging from $138.7600 to $139.1300 inclusive during the trading session.

How many Axcelis (ACLS) shares does John T. Kurtzweil hold after the sale?

After the transaction, John T. Kurtzweil directly holds 32,990 shares of Axcelis Technologies common stock. This figure includes shares already owned plus equity-based awards that remain outstanding as part of his total reported position.

What portion of John T. Kurtzweil’s Axcelis (ACLS) holdings are restricted stock units?

Of the shares reported as held after the sale, 1,440 shares are issuable upon vesting of restricted stock units. These RSUs were granted under the 2012 Equity Incentive Plan and remain subject to forfeiture until vesting conditions are met.

Was John T. Kurtzweil’s Axcelis (ACLS) transaction an open-market sale?

Yes. The filing classifies the transaction as an open-market sale of common stock, using transaction code “S.” This indicates he sold existing shares into the public market rather than exercising options or receiving new shares from the company.

Does the Axcelis (ACLS) Form 4 show any option exercises or derivative transactions?

No. The disclosed activity involves only a non-derivative sale of common stock. The derivative summary section is empty, indicating there were no reported option exercises, conversions, or other derivative security transactions in this particular filing.