Was Blumenstock’s Axcelis (ACLS) transaction a derivative exercise or a straightforward share sale?

The filing characterizes Blumenstock’s transaction as a straightforward open-market sale of common stock. It is not reported as an option or warrant exercise, and there are no derivative positions listed in the derivative transaction summary for this Form 4.

Axcelis (NASDAQ: ACLS) EVP sells 1,015 shares, retains RSU stake

Filing Impact

(Moderate)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Axcelis Technologies executive Gerald M. Blumenstock, EVP of Research, Development & Engineering, reported an open-market sale of 1,015 shares of common stock on May 14, 2026 at an average price of $162.315 per share. Following this sale, he is shown with 17,293 shares that are issuable upon vesting of restricted stock units under the 2012 Equity Incentive Plan, all of which are subject to forfeiture. The footnote notes this amount includes restricted stock units earned based on achieving 112.5% of his 2025 performance-based restricted stock unit grant tied to 2025 performance goals.

Insider Trade Summary

Net Seller: 1,015 shares ($164,750)

Net Sell 1 txn

Insider Blumenstock Gerald M

Role EVP, Research, Dev. & Eng.

Sold 1,015 shs ($165K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,015	$162.315	$165K

Holdings After Transaction: Common Stock — 17,293 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 1,015 shares Sale price: $162.315 per share Shares following transaction: 17,293 shares +1 more

4 metrics

Shares sold 1,015 shares Open-market sale of Axcelis common stock on May 14, 2026

Sale price $162.315 per share Average price for the 1,015 shares sold

Shares following transaction 17,293 shares Issuable upon vesting of restricted stock units after sale

Performance RSU achievement 112.5% Portion of 2025 performance-based RSU grant earned based on 2025 goals

Key Terms

restricted stock units, 2012 Equity Incentive Plan, open-market sale, performance goals

4 terms

restricted stock units financial

"17,293 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 and are subject to forfeiture"

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.

performance goals financial

"restricted stock units granted in 2025 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.

Form 4 Insider Transactions: What Each Field Means →

05/15/2026 - 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^*

Blumenstock Gerald M

(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, Research, Dev. & Eng.

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026

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	05/14/2026		S		1,015	D	$162.315	17,293⁽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 14, 2026, 17,293 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	05/15/2026
	** 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 Gerald Blumenstock report for Axcelis (ACLS)?

Gerald M. Blumenstock reported selling 1,015 shares of Axcelis common stock. The sale was an open-market transaction and reflects routine portfolio activity by the company’s EVP of Research, Development & Engineering as disclosed in a Form 4 insider trading report.

How many Axcelis (ACLS) shares did Blumenstock sell and at what price?

Blumenstock sold 1,015 shares of Axcelis common stock at an average price of $162.315 per share. This transaction represents a relatively small block and was executed as an open-market sale according to the Form 4 filing details.

What are Gerald Blumenstock’s holdings after this Axcelis (ACLS) Form 4 sale?

After the sale, Blumenstock is shown with 17,293 shares issuable upon vesting of restricted stock units. These units were granted under Axcelis’s 2012 Equity Incentive Plan and remain subject to forfeiture based on vesting and plan conditions described in the filing footnote.

What does the Form 4 footnote say about Blumenstock’s Axcelis restricted stock units?

The footnote explains that the 17,293 shares are issuable on vesting of restricted stock units under the 2012 Equity Incentive Plan and are subject to forfeiture. It also notes this figure includes units earned by achieving 112.5% of his 2025 performance-based RSU grant.