SEC Form 4 · accession 0001140361-26-024322

ACM Research, Inc. · ACMR

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Sotheara Cheav

Officer — See remarks

Period of report

Jun 4, 2026

Accepted (ET)

Jun 5, 2026 · 9:00 pm EDT

Rule 10b5-1 plan

yes — trade under a plan

Issuer CIK

0001680062

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I
Class A Common Stock	Jun 4, 2026	M	13,351	$13.89	A	113,353	D
Class A Common Stock^F2	Jun 4, 2026	S	1,300	$84.08	D	112,053	D
Class A Common Stock^F3	Jun 4, 2026	S	9,212	$85.11	D	102,841	D
Class A Common Stock^F4	Jun 4, 2026	S	2,839	$85.77	D	100,002	D
Class A Common Stock	Jun 5, 2026	M	5,399	$13.89	A	105,401	D
Class A Common Stock^F5	Jun 5, 2026	S	2,384	$81.73	D	103,017	D
Class A Common Stock^F6	Jun 5, 2026	S	968	$82.61	D	102,049	D
Class A Common Stock^F7	Jun 5, 2026	S	400	$84.01	D	101,649	D
Class A Common Stock^F8	Jun 5, 2026	S	1,647	$85.41	D	100,002	D

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Stock Option^F9	$13.89	Jun 4, 2026	M	13,351	D	—	Aug 9, 2033	Class A Common Stock	13,351	42,899	D
Stock Option^F9	$13.89	Jun 5, 2026	M	5,399	D	—	Aug 9, 2033	Class A Common Stock	5,399	37,500	D

Explanation of responses

F1The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 5, 2026.
F2The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.61 to $84.4, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2), (3), (4), (5), (6), (7), and (8) to this Form 4.
F3The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $84.63 to $85.6, inclusive.
F4The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $85.7 to $86.19, inclusive.
F5The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $81.22 to $82.07, inclusive.
F6The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $82.38 to $82.89, inclusive.
F7The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $83.85 to $84.5, inclusive.
F8The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $85.27 to $85.72, inclusive.
F9The option is fully vested and exercisable.

Remarks

Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.