David H. Wang - Dec 3, 2025 Form 4 Insider Report for ACM Research, Inc. (ACMR)

Role
Chief Executive Officer, President and Director, Director, 10%+ Owner
Signature
/s/ Mark McKechnie, Attorney-in-Fact for David H. Wang
Stock symbol
ACMR
Transactions as of
Dec 3, 2025
Transactions value $
-$4,231,477
Form type
4
Date filed
12/5/2025, 04:30 PM
Previous filing
Oct 29, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Wang David H Chief Executive Officer, President and Director, Director, 10%+ Owner C/O ACM RESEARCH, INC., 42307 OSGOOD ROAD, SUITE I, FREMONT /s/ Mark McKechnie, Attorney-in-Fact for David H. Wang 2025-12-05 0001721580

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ACMR Class A Common Stock Options Exercise $70K +70K +8.72% $1.00 873K Dec 3, 2025 Direct
transaction ACMR Class A Common Stock Sale -$2.27M -68.8K -7.88% $33.05 804K Dec 3, 2025 Direct F1, F2
transaction ACMR Class A Common Stock Sale -$40.3K -1.2K -0.15% $33.56 803K Dec 3, 2025 Direct F1, F3
transaction ACMR Class A Common Stock Options Exercise $60K +60K +7.47% $1.00 863K Dec 4, 2025 Direct
transaction ACMR Class A Common Stock Sale -$664K -19.8K -2.3% $33.52 843K Dec 4, 2025 Direct F1, F4
transaction ACMR Class A Common Stock Sale -$1.38M -40.2K -4.77% $34.42 803K Dec 4, 2025 Direct F1, F5
holding ACMR Class A Common Stock 100K Dec 3, 2025 By Jing Chen, wife of David H. Wang
holding ACMR Class A Common Stock 45.8K Dec 3, 2025 By Sophia Wang, daughter of David H. Wang
holding ACMR Class A Common Stock 180K Dec 3, 2025 By David Hui Wang and Jing Chen Family Irrevocable Trust for Wang Children
holding ACMR Class A Common Stock 620K Dec 3, 2025 By Wang-Chen Family Living Trust

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction ACMR Stock Option Options Exercise $0 -70K -11.48% $0.00 540K Dec 3, 2025 Class A Common Stock 70K $1.00 Direct F6
transaction ACMR Stock Option Options Exercise $0 -60K -11.11% $0.00 480K Dec 4, 2025 Class A Common Stock 60K $1.00 Direct F6
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

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).

Explanation of Responses:

Id Content
F1 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 29, 2024.
F2 The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $32.51 to $33.48, 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), and (5) to this Form 4.
F3 The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $33.53 to $33.59, inclusive.
F4 The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $33.07 to $34.04, inclusive.
F5 The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $34.18 to $34.63, inclusive.
F6 The option is fully vested and exercisable.

Remarks:

Chief Executive Officer, President and Director