ACM Research, Inc.

DEF 14A 1 acmr-2026proxystatements.htm DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to

Section 14(a) of the Securities Exchange Act of 1934

Check the appropriate box:

ACM Research, Inc.

(Name of Registrant as Specified In Its Charter)

Payment of Filing Fee (Check the appropriate box):

42307 Osgood Rd, Suite IFremont, California 94539

April 27, 2026

Dear Fellow Stockholder:

It is my pleasure to invite you to attend the Annual Meeting of Stockholders of ACM Research, Inc. to be held on June 10, 2026, at 7 a.m., Pacific time. This year’s Annual Meeting will be a “virtual meeting” conducted via live audio webcast, consistent with our prior practice. Each holder of Class A or Class B common stock as of 5 p.m., Eastern time, on the record date of April 13, 2026, will be able to participate in the Annual Meeting by accessing a live webcast at virtualshareholdermeeting.com/ACMR2026 and entering the control number included on the stockholder’s Notice of Internet Availability of Proxy Materials or proxy card. Stockholders will also be able to vote their shares and submit questions via the Internet during the meeting by participating in the webcast.

During the Annual Meeting, stockholders will be asked to elect the entire board of directors and to ratify the appointment of Ernst & Young Hua Ming LLP as our independent auditor for 2026.

We are furnishing proxy materials to our stockholders over the Internet. This process expedites the delivery of proxy materials to our stockholders, lowers our costs and reduces the environmental impact of the Annual Meeting. Today we are sending to each of our stockholders a Notice of Internet Availability of Proxy Materials containing instructions on how to access our Proxy Statement for the Annual Meeting and our 2025 Annual Report to Stockholders, as well as how to vote via proxy either by telephone or over the Internet.

It is important that you vote your shares of Class A and Class B common stock virtually or by proxy, regardless of the number of shares you own. You will find the instructions for voting on your Notice of Internet Availability of Proxy Materials or proxy card. We appreciate your prompt attention.

The board invites you to participate in the Annual Meeting so that management can listen to your suggestions, answer your questions, and discuss business developments and trends with you. Thank you for your support, and we look forward to joining you at the Annual Meeting.

Sincerely,

David H. Wang

Chief Executive Officer and President

42307 Osgood Rd, Suite IFremont, California 94539

Notice of 2026 Annual Meeting

of Stockholders

Meeting Details

When

7 a.m., Pacific time,

on June 10, 2026

Where

Webcast only, access at:

virtualshareholdermeeting.com/ACMR2026

IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON June 10, 2026:

The Notice of 2026 Annual Meeting of Stockholders, the Proxy Statement, the 2026 Annual Report to Stockholders and instructions for voting via the Internet can be accessed at proxyvote.com.

To Stockholders of ACM Research, Inc.:

The board of directors is soliciting proxies for use at the ACM Research, Inc. 2026 Annual Meeting of Stockholders. You are receiving the enclosed proxy statement because you were a holder of Class A or Class B common stock as of 5 p.m., Eastern time, on the record date of April 13, 2026 and therefore are entitled to vote at the Annual Meeting.

You may participate in the Annual Meeting, including casting votes and submitting questions, by accessing a live webcast at virtualshareholdermeeting.com/ACMR2026 and then using the 16-digit control number provided on the Notice of Internet Availability of Proxy Materials or proxy card being delivered to you. Online check-in to the Annual Meeting will begin at 6:45 a.m., Pacific time, and stockholders are encouraged to allow time to log in to the meeting webcast and test their computer audio system. There will be no physical location for the Annual Meeting.

How to Vote in Advance

Your vote is important. Please vote as soon as possible by one of the methods shown below. Your Notice of Internet Availability of Proxy Materials, proxy card or voting instruction form should be readily available.

The Annual Meeting will be held to consider and vote upon the following proposals:

In addition, any other business properly presented may be acted upon at the Annual Meeting. Each share of Class A common stock is entitled to one vote, and each share of Class B common stock is entitled to twenty votes for each proposal.

42307 Osgood Rd, Suite IFremont, California 94539

In accordance with Securities and Exchange Commission rules, we are providing stockholders with access to proxy materials on the Internet, instead of mailing printed copies. We are mailing to stockholders, commencing on or about April 27, 2026, a Notice of Internet Availability of Proxy Materials to provide:

•directions for accessing and reviewing the proxy materials on the Internet and submitting a proxy over the Internet or by telephone;

•instructions for requesting copies of proxy materials in printed form or by email at no charge; and

•a control number for use in submitting proxies and accessing the Annual Meeting webcast.

By Order of the Board,

Mark McKechnie

Secretary

April 27, 2026

We will maintain a list of stockholders of record as of the record date at our corporate headquarters located at 42307 Osgood Road, Suite I, Fremont, California 94539 for a period of ten days prior to, and ending at the close of, the Annual Meeting. In order for us to make the list available to you quickly and safety, we recommend that you notify us by emailing investor.relations@acmrcsh.com one business day in advance of the day on which you intend to review the list. Beginning fifteen minutes prior to, and ending at the close of, the Annual Meeting, the list of our stockholders of record will be available for viewing by stockholders for any purpose germane to the meeting at virtualshareholdermeeting.com/ACMR2026.

42307 Osgood Rd, Suite IFremont, California 94539

2026 Annual Meeting of Stockholders

Proxy Statement dated April 27, 2026

ACM Research, Inc., a Delaware corporation, is furnishing this Proxy Statement and related proxy materials in connection with the solicitation by its board of directors of proxies to be voted at its 2026 Annual Meeting of Stockholders and any adjournments. ACM Research, Inc. is providing these materials to the holders of record of its Class A common stock, $0.0001 par value per share, and Class B common stock, $0.0001 par value per share, as of 5 p.m., Eastern time, on the record date of April 13, 2026 and is first mailing the materials on or about April 27, 2026.

The Annual Meeting is scheduled to be held exclusively by webcast as follows:

Your vote is important.

Please see the detailed information that follows in the Proxy Statement.

42307 Osgood Rd, Suite IFremont, California 94539

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