ACM Research (NASDAQ: ACMR) insider exercises 110,000 options and sells 110,000 shares

Rhea-AI Filing Summary

ACM Research insider David H. Wang, a director, officer and more than 10% owner, exercised stock options and sold shares of Class A Common Stock. On March 11–12, 2026, he exercised options for a total of 110,000 shares at an exercise price of $1.00 per share.

Over the same two days, Wang executed open-market sales totaling 110,000 shares at weighted average prices ranging from the mid‑$44 to high‑$48 range, under a pre-arranged Rule 10b5‑1 trading plan adopted on November 29, 2024. After these transactions, he held 802,708 shares directly, plus additional indirect holdings through family members and family trusts.

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).

X

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^*

Wang David H

(Last) (First) (Middle)

C/O ACM RESEARCH, INC.

42307 OSGOOD ROAD, SUITE I

(Street)

FREMONT CA 94539

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ACM Research, Inc. [ ACMR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	See Remarks

3. Date of Earliest Transaction (Month/Day/Year)
03/11/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	03/11/2026		M		60,000	A	$1	862,708	D
Class A Common Stock	03/11/2026		S(1)		55,373	D	$47.89(2)	807,335	D
Class A Common Stock	03/11/2026		S(1)		4,627	D	$48.34(3)	802,708	D
Class A Common Stock	03/12/2026		M		50,000	A	$1	852,708	D
Class A Common Stock	03/12/2026		S(1)		10,561	D	$44.92(4)	842,147	D
Class A Common Stock	03/12/2026		S(1)		38,737	D	$45.74(5)	803,410	D
Class A Common Stock	03/12/2026		S(1)		702	D	$46.57(6)	802,708	D
Class A Common Stock								100,002	I	By Jing Chen, wife of David H. Wang
Class A Common Stock								45,837	I	By Sophia Wang, daughter of David H. Wang
Class A Common Stock								180,000	I	By David Hui Wang and Jing Chen Family Irrevocable Trust for Wang Children
Class A Common Stock								620,001	I	By Wang-Chen Family Living Trust

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option	$1	03/11/2026		M			60,000	(7)	12/27/2026	Class A Common Stock	60,000	$0	420,002	D
Stock Option	$1	03/12/2026		M			50,000	(7)	12/27/2026	Class A Common Stock	50,000	$0	370,002	D

Explanation of Responses:

1. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $47.23 to $48.22, 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), and (6) to this Form 4.

3. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.23 to $48.61, inclusive.

4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $44.40 to $45.39, inclusive.

5. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $45.40 to $46.39, inclusive.

6. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $46.45 to $46.59, inclusive.

7. The option is fully vested and exercisable.

Remarks:

Chief Executive Officer, President and Director

	/s/ Mark McKechnie, Attorney-in-Fact for David H. Wang	03/13/2026
	** 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.

FAQ

What did ACM Research (ACMR) insider David H. Wang report in this Form 4?

David H. Wang reported exercising stock options and selling Class A Common Stock. He exercised options for 110,000 shares at $1.00 per share and sold 110,000 shares in open-market transactions over March 11–12, 2026 under a pre-arranged trading plan.

How many ACM Research (ACMR) shares did David H. Wang sell and at what prices?

He sold a total of 110,000 Class A Common shares. The filing shows weighted average sale prices in several ranges, with transactions occurring roughly between the mid-$44 and high-$48 per share, across multiple open-market trades on March 11 and March 12, 2026.

How many ACM Research (ACMR) shares does David H. Wang hold after these transactions?

After the reported trades, Wang directly holds 802,708 Class A Common shares. The Form 4 also lists additional indirect holdings through his spouse, daughter and family trusts, reflecting further exposure to ACM Research stock beyond his direct ownership position.

Were David H. Wang’s ACM Research (ACMR) stock sales part of a Rule 10b5-1 plan?

Yes. A footnote explains the sales were executed under a Rule 10b5-1 trading plan adopted on November 29, 2024. Such plans pre-schedule trades, indicating these sales were planned in advance rather than being ad hoc market-timing decisions by the insider.

What option activity did ACM Research (ACMR) insider David H. Wang report?

He reported exercising stock options for 110,000 underlying Class A Common shares at an exercise price of $1.00 per share. The filing notes the option involved was fully vested and exercisable, and the exercises occurred on March 11 and March 12, 2026.

What indirect ACM Research (ACMR) holdings are associated with David H. Wang?

The Form 4 lists indirect ownership in Class A Common Stock through his wife Jing Chen, his daughter Sophia Wang, a family irrevocable trust for the children, and the Wang‑Chen Family Living Trust, indicating substantial additional exposure to ACM Research beyond his direct holdings.