Key facts
- This page summarizes David H. Wang's Form 4 filing for ACM Research, Inc. (ACMR).
- 13 reported transactions and 2 derivative rows are listed below.
- Accepted by SEC: 10 Sep 2026, 16:30.
David H. Wang - 08 Sep 2026 Form 4 Insider Report for ACM Research, Inc. (ACMR)
- Reporting relationship
- Officer, Director, 10%+ Owner
- Issuer ticker
- ACMR
- Reported as of
- 08 Sep 2026
- Net transaction value
- -$10,630,010
- SEC form
- 4
- Accepted by SEC
- 10 Sep 2026, 16:30:22 UTC
- Prior SEC filing
- 05 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Mark McKechnie, Attorney-in-Fact for David H. Wang
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
David H. Wang filed Form 4 for ACM Research, Inc. (ACMR) on 10 Sep 2026.
Change
- Previous filing in this sequence was filed on 05 Jun 2026.
- Current net transaction value: -$10,630,010.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001721580
Primary reporting owner
Wang David H
- Relationship
- Officer, Director, 10%+ Owner
- Address
- C/O ACM RESEARCH, INC., 42307 OSGOOD ROAD, SUITE I, FREMONT
- Signature
- /s/ Mark McKechnie, Attorney-in-Fact for David H. Wang
- Signature date
- 10 Sep 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
ACMR
transaction
Class A Common Stock
Options Exercise
- Transaction value
- Shares
- +70,000
- Change %
- +8.7%
- Price
- $1.00*
- Shares after
- 872,708
- Date
- 08 Sep 2026
- Ownership
- Direct
ACMR
transaction
Class A Common Stock
Sale
- Transaction value
- $364,980
- Shares
- -4,803
- Change %
- -0.55%
- Price
- $75.99
- Shares after
- 867,905
- Date
- 08 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F2
ACMR
transaction
Class A Common Stock
Sale
- Transaction value
- $3,963,504
- Shares
- -51,374
- Change %
- -5.9%
- Price
- $77.15
- Shares after
- 816,531
- Date
- 08 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F3
ACMR
transaction
Class A Common Stock
Sale
- Transaction value
- $962,180
- Shares
- -12,323
- Change %
- -1.5%
- Price
- $78.08
- Shares after
- 804,208
- Date
- 08 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F4
ACMR
transaction
Class A Common Stock
Sale
- Transaction value
- $117,855
- Shares
- -1,500
- Change %
- -0.19%
- Price
- $78.57
- Shares after
- 802,708
- Date
- 08 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F5
ACMR
transaction
Class A Common Stock
Options Exercise
- Transaction value
- Shares
- +70,000
- Change %
- +8.7%
- Price
- $1.00*
- Shares after
- 872,708
- Date
- 09 Sep 2026
- Ownership
- Direct
ACMR
transaction
Class A Common Stock
Sale
- Transaction value
- $2,471,783
- Shares
- -33,493
- Change %
- -3.8%
- Price
- $73.80
- Shares after
- 839,215
- Date
- 09 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F6
ACMR
transaction
Class A Common Stock
Sale
- Transaction value
- $1,413,802
- Shares
- -18,934
- Change %
- -2.3%
- Price
- $74.67
- Shares after
- 820,281
- Date
- 09 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F7
ACMR
transaction
Class A Common Stock
Sale
- Transaction value
- $881,716
- Shares
- -11,666
- Change %
- -1.4%
- Price
- $75.58
- Shares after
- 808,615
- Date
- 09 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F8
ACMR
transaction
Class A Common Stock
Sale
- Transaction value
- $368,841
- Shares
- -4,807
- Change %
- -0.59%
- Price
- $76.73
- Shares after
- 803,808
- Date
- 09 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F9
ACMR
transaction
Class A Common Stock
Sale
- Transaction value
- $85,349
- Shares
- -1,100
- Change %
- -0.14%
- Price
- $77.59
- Shares after
- 802,708
- Date
- 09 Sep 2026
- Ownership
- Direct
- Footnotes
- F1, F10
ACMR
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 100,002
- Date
- 08 Sep 2026
- Ownership
- By Jing Chen, wife of David H. Wang
ACMR
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 180,000
- Date
- 08 Sep 2026
- Ownership
- By David Hui Wang and Jing Chen Family Irrevocable Trust for Wang Children
ACMR
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 620,001
- Date
- 08 Sep 2026
- Ownership
- By Wang-Chen Family Living Trust
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
ACMR
transaction
Derivative
Stock Option
Options Exercise
- Transaction value
- Shares
- -70,000
- Change %
- -26%
- Price
- $0.000000*
- Shares after
- 200,000
- Date
- 08 Sep 2026
- Ownership
- Direct
- Underlying class
- Class A Common Stock
- Underlying amount
- 70,000
- Exercise price
- $1.00
- Footnotes
- F11
ACMR
transaction
Derivative
Stock Option
Options Exercise
- Transaction value
- Shares
- -70,000
- Change %
- -35%
- Price
- $0.000000*
- Shares after
- 130,000
- Date
- 09 Sep 2026
- Ownership
- Direct
- Underlying class
- Class A Common Stock
- Underlying amount
- 70,000
- Exercise price
- $1.00
- Footnotes
- F11
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Rule 10b5-1 trading plan
These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.
Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).
Explanation of responses 11 footnotes
Footnote F1
The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2026.
Footnote F2
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.52 to $76.41, 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), (8), (9), and (10) to this Form 4.
Footnote F3
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.52 to $77.5, inclusive.
Footnote F4
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.52 to $78.48, inclusive.
Footnote F5
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $78.55 to $78.64, inclusive.
Footnote F6
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $73.26 to $74.21, inclusive.
Footnote F7
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $74.26 to $75.22, inclusive.
Footnote F8
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.28 to $75.95, inclusive.
Footnote F9
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.38 to $77.35, inclusive.
Footnote F10
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $77.59 to $77.59, inclusive.
Footnote F11
The option is fully vested and exercisable.