Thomas St Dennis - 22 May 2026 Form 4 Insider Report for AXCELIS TECHNOLOGIES INC (ACLS)

Reporting relationship: Director
Issuer ticker: ACLS
Reported as of: 22 May 2026
Net transaction value: -$139,833
SEC form: 4
Accepted by SEC: 26 May 2026, 17:05:07 UTC
Prior SEC filing: 21 May 2026
Next SEC filing: 16 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Eileen J. Evans, Attorney-in-Fact

Key filing fact

Thomas St Dennis filed Form 4 for AXCELIS TECHNOLOGIES INC (ACLS) on 26 May 2026.

Key facts

This page summarizes Thomas St Dennis's Form 4 filing for AXCELIS TECHNOLOGIES INC (ACLS).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 26 May 2026, 17:05.

Change

Previous filing in this sequence was filed on 21 May 2026.
Current net transaction value: -$139,833.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001339595 Primary reporting owner

St Dennis Thomas

Relationship: Director
Address: C/O AXCELIS TECHNOLOGIES, INC., 108 CHERRY HILL DRIVE, BEVERLY
Signature: /s/ Eileen J. Evans, Attorney-in-Fact
Signature date: 26 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ACLS transaction

Common Stock

Sale

Transaction value: $139,833
Shares: -900
Change %: -4.8%
Price: $155.37
Shares after: 17,695
Date: 22 May 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Of the shares held after this sale on May 22, 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.