Mark McKechnie - 12 Mar 2026 Form 4 Insider Report for ACM Research, Inc. (ACMR)

Reporting relationship: Chief Financial Officer and Treasurer
Issuer ticker: ACMR
Reported as of: 12 Mar 2026
Net transaction value: -$4,491,952
SEC form: 4
Accepted by SEC: 13 Mar 2026, 21:30:44 UTC
Prior SEC filing: 08 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ Mark McKechnie

Key filing fact

Mark McKechnie filed Form 4 for ACM Research, Inc. (ACMR) on 13 Mar 2026.

Key facts

This page summarizes Mark McKechnie's Form 4 filing for ACM Research, Inc. (ACMR).
10 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 13 Mar 2026, 21:30.

Change

Previous filing in this sequence was filed on 08 Dec 2025.
Current net transaction value: -$4,491,952.

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

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001775007 Primary reporting owner

McKechnie Mark

Relationship: Chief Financial Officer and Treasurer
Address: C/O ACM RESEARCH, INC., 42307 OSGOOD ROAD, SUITE I, FREMONT
Signature: /s/ Mark McKechnie
Signature date: 13 Mar 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: +60,000
Change %: +6667%
Price: $13.89^*
Shares after: 60,900
Date: 12 Mar 2026
Ownership: Direct

ACMR transaction

Class A Common Stock

Sale

Transaction value: $534,640
Shares: -11,910
Change %: -20%
Price: $44.89
Shares after: 48,990
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F2

ACMR transaction

Class A Common Stock

Sale

Transaction value: $2,154,720
Shares: -47,108
Change %: -96%
Price: $45.74
Shares after: 1,882
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F3

ACMR transaction

Class A Common Stock

Sale

Transaction value: $45,712
Shares: -982
Change %: -52%
Price: $46.55
Shares after: 900
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F4

ACMR transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +38,551
Change %: +4283%
Price: $19.49^*
Shares after: 39,451
Date: 12 Mar 2026
Ownership: Direct

ACMR transaction

Class A Common Stock

Sale

Transaction value: $388,237
Shares: -8,639
Change %: -22%
Price: $44.94
Shares after: 30,812
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F5

ACMR transaction

Class A Common Stock

Sale

Transaction value: $1,342,378
Shares: -29,348
Change %: -95%
Price: $45.74
Shares after: 1,464
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F6

ACMR transaction

Class A Common Stock

Sale

Transaction value: $26,265
Shares: -564
Change %: -39%
Price: $46.57
Shares after: 900
Date: 12 Mar 2026
Ownership: Direct
Footnotes: F1, F7

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: -60,000
Change %: -20%
Price: $0.000000^*
Shares after: 240,000
Date: 12 Mar 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 60,000
Exercise price: $13.89
Footnotes: F8

ACMR transaction Derivative

Stock Option

Options Exercise

Transaction value
Shares: -38,551
Change %: -39%
Price: $0.000000^*
Shares after: 61,449
Date: 12 Mar 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 38,551
Exercise price: $19.49
Footnotes: F8

^* 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 8 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 August 27, 2025.

Footnote F2

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.37 to $45.35, 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) and (7) 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 $45.37 to $46.36, 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 $46.39 to $46.59, 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 $44.40 to $45.39, 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 $45.40 to $46.39, 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 $46.45 to $46.59, inclusive.

Footnote F8

The option is fully vested and exercisable.

SEC remarks

Chief Financial Officer and Treasurer