Axcelis Technologies Ownership & Insider Activity

Axcelis Technologies (ACLS) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 8.8% of shares outstanding. Institutional investors hold 80.0%.

Shares Outstanding

30.881M

Shares Float

21.426M

Insider Shares Owned

2.732M

Insider % Owned

8.8%

Institutional Shares Held

24.705M

Institutional % Held

80.0%

Ownership Breakdown

Net Insider Activity by Month

Axcelis Technologies Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Jun 3, 2026	Necip Sayiner	—	SELL	1.586K	$157.44	$250K
Jun 2, 2026	John Robert Mahoney	EVP GLOBAL OPERATIONS	SELL	1.155K	$155.24	$179K
May 27, 2026	Todd Sutton	VP CORPORATE CONTROLLER	SELL	2.000K	$159.99	$320K
May 22, 2026	Thomas Dennis St	—	SELL	900.000	$155.37	$140K
May 22, 2026	Eileen Evans	EVP, GENERAL COUNSEL AND SEC'Y	SELL	926.000	$155.51	$144K
May 21, 2026	Gerald Blumenstock	EVP, RESEARCH, DEV. & ENG.	SELL	1.161K	$152.70	$177K
May 20, 2026	Christopher Tatnall	EVP GLOBAL CUSTOMER OPERATIONS	SELL	1.166K	$149.75	$175K
May 19, 2026	GREGORY GRAVES	—	SELL	3.225K	$141.61	$457K
May 19, 2026	JOHN KURTZWEIL	—	SELL	3.500K	$138.79	$486K
May 19, 2026	Jeanne Quirk	—	SELL	1.789K	$140.22	$251K
May 14, 2026	Todd Sutton	VP CORPORATE CONTROLLER	SELL	2.574K	$163.89	$422K
May 14, 2026	Gerald Blumenstock	EVP, RESEARCH, DEV. & ENG.	SELL	1.015K	$162.31	$165K
May 13, 2026	Jorge Titinger	—	SELL	2.000K	$164.14	$328K
May 13, 2026	Greg Redinbo	EVP MARKETING AND APPLICATIONS	SELL	2.883K	$160.85	$464K
May 12, 2026	John Robert Mahoney	EVP GLOBAL OPERATIONS	SELL	2.258K	$161.00	$364K
May 6, 2026	Russell Low	PRESIDENT AND CEO	SELL	7.468K	$156.75	$1.2M
May 1, 2026	Russell Low	PRESIDENT AND CEO	SELL	1.244K	$138.86	$173K