Form 4 for ACLS AXCELIS TECHNOLOGIES INC

Accepted 2026-05-20 17:05:21 ET · period of report 2026-05-19 · accession 0001208109-26-000004 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
M	2026-05-20 17:05	2026-05-19	ACLS	GRAVES GREGORY B	Dir	S - Sale	$141.61	-3,225	5,473	-37%	-$456.7K

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-05-19	S	D	2,625	$141.41	6,073	D	—	—	(F1) The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $141.3301 to $141.6000, 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. (F2) Of the shares held after this sale on May 19, 2026, 2,110 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.
2	Common	Common Stock	2026-05-19	S	D	600	$142.51	5,473	D	—	—	(F3) The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $142.4400 to $142.6400, 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. (F4) Of the shares held after this sale on May 19, 2026, 2,110 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.