Axcelis (ACLS) director awarded 1,440 RSUs, now holds 18,595 shares

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

St Dennis Thomas reported acquisition or exercise transactions in this Form 4 filing.

Axcelis Technologies director Thomas St. Dennis reported an equity award of 1,440 shares of common stock in the form of restricted stock units. The award was granted at no cash cost on May 15, 2026 under the company’s 2012 Equity Incentive Plan as compensation for board service.

These restricted stock units are scheduled to vest on May 15, 2027, assuming he completes his current term on the Board of Directors, and are subject to forfeiture until they vest. Following this grant, St. Dennis directly holds 18,595 shares of common stock, including the 1,440 unvested units.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider St Dennis Thomas

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	1,440	$0.00	--

Holdings After Transaction: Common Stock — 18,595 shares (Direct, null)

Footnotes (1)

These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan on May 15, 2026. Assuming completion of the director's current term of service on the Board of Directors, these restricted stock units will vest on May 15, 2027. Of the shares held as of May 15, 2026, 1,440 were issuable on vesting of restricted stock units granted to the director under the 2012 Equity Incentive Plan and are subject to forfeiture.

Key Figures

RSU award: 1,440 shares Grant price: $0.00 per share Holdings after award: 18,595 shares +1 more

4 metrics

RSU award 1,440 shares Restricted stock units granted May 15, 2026

Grant price $0.00 per share Reported price for RSU award

Holdings after award 18,595 shares Common stock directly held following transaction

Vesting date May 15, 2027 Scheduled vesting of 1,440 restricted stock units

Key Terms

restricted stock units, 2012 Equity Incentive Plan, subject to forfeiture, Form 4

4 terms

restricted stock units financial

"These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan"

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 under the Company's 2012 Equity Incentive Plan on May 15, 2026"

subject to forfeiture financial

"1,440 were issuable on vesting of restricted stock units granted to the director under the 2012 Equity Incentive Plan and are subject to forfeiture"

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

05/18/2026 - 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^*

St Dennis Thomas

(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)
05/15/2026

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)
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	05/15/2026		A		1,440	A	$0⁽¹⁾	18,595⁽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)
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. These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan on May 15, 2026. Assuming completion of the director's current term of service on the Board of Directors, these restricted stock units will vest on May 15, 2027.

2. Of the shares held as of May 15, 2026, 1,440 were issuable on vesting of restricted stock units granted to the director under the 2012 Equity Incentive Plan and are subject to forfeiture.

	/s/ Eileen J. Evans, Attorney-in-Fact	05/18/2026
	** 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) director Thomas St. Dennis report?

Thomas St. Dennis reported receiving 1,440 shares of Axcelis common stock as restricted stock units. The award was granted as equity compensation under the 2012 Equity Incentive Plan and does not represent an open-market purchase or sale of shares.

When do Thomas St. Dennis’s new Axcelis (ACLS) restricted stock units vest?

The 1,440 restricted stock units are scheduled to vest on May 15, 2027. Vesting depends on St. Dennis completing his current term of service on Axcelis’s Board of Directors, and the units remain subject to forfeiture until they fully vest.

How many Axcelis (ACLS) shares does Thomas St. Dennis hold after this Form 4?

After the reported award, Thomas St. Dennis directly holds 18,595 shares of Axcelis common stock. This total includes 1,440 shares that are issuable upon vesting of restricted stock units and that remain subject to potential forfeiture until vesting.

Was cash paid for the Axcelis (ACLS) shares granted to Thomas St. Dennis?

No cash was paid for these shares; the 1,440 restricted stock units were granted at a reported price of $0.00 per share. They represent stock-based compensation awarded under Axcelis’s 2012 Equity Incentive Plan for his service on the Board.

Are Thomas St. Dennis’s new Axcelis (ACLS) restricted stock units subject to forfeiture?

Yes. The footnotes state that 1,440 shares are issuable upon vesting of restricted stock units and are subject to forfeiture. They will vest only if St. Dennis completes his current term on the Axcelis Board through May 15, 2027.