ACM Research details Shanghai STAR Market IR filing

ACM Research, Inc. reported that shares of its operating subsidiary, Research (Shanghai), Inc. are listed on the Sci-Tech innovation board (the STAR Market) of the Shanghai Stock Exchange.

Rhea-AI Filing Summary

ACM Research, Inc. reported that shares of its operating subsidiary, Research (Shanghai), Inc. are listed on the Sci-Tech innovation board (the STAR Market) of the Shanghai Stock Exchange. In line with STAR Market rules, the Shanghai subsidiary filed a Record of January 2026 Investor Relations Activity with the exchange.

The Shanghai Stock Exchange posted this investor relations record on January 29, 2026, and ACM Research furnished an unofficial English translation as Exhibit 99.1. The company emphasized that this information is being furnished, not filed, and is not incorporated by reference into its Securities Act filings.

8-K Event Classification

2 items: 8.01, 9.01

2 items

Item 8.01 Other Events Other

Voluntary disclosure of events the company deems important to shareholders but not covered by other items.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, or exhibit attachments filed with this report.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did ACMR disclose about its Shanghai subsidiary in this 8-K?

ACM Research disclosed that its operating subsidiary, Research (Shanghai), Inc., filed a Record of January 2026 Investor Relations Activity with the Shanghai Stock Exchange. The record relates to the subsidiary’s listing on the STAR Market and was posted by the exchange on January 29, 2026.

Where are ACMR’s Shanghai subsidiary shares listed?

Shares of Research (Shanghai), Inc., ACM Research’s operating subsidiary, are listed on the Sci-Tech innovation board, known as the STAR Market, of the Shanghai Stock Exchange. The 8-K highlights this listing in connection with the investor relations activity record filed in January 2026.

What is Exhibit 99.1 in ACMR’s January 2026 8-K filing?

Exhibit 99.1 is the Record of January 2026 Investor Relations Activity filed by Research (Shanghai), Inc. with the Shanghai Stock Exchange. ACM Research furnished an unofficial English translation of this Mandarin Chinese document as part of the current report on Form 8-K.

Is the investor relations record considered filed under the Exchange Act?

The company states that the information in this report, including Exhibit 99.1, is intended to be furnished and not deemed filed for purposes of Section 18 of the Securities Exchange Act of 1934, which means it is not subject to that section’s liability provisions.

Does ACMR incorporate the Shanghai investor relations record into its Securities Act filings?

No. ACM Research specifies that the information in this report, including Exhibit 99.1, is not deemed incorporated by reference into any filing under the Securities Act of 1933. This limits its automatic inclusion in other registration or offering documents.

What role does the STAR Market’s rules play in this ACMR disclosure?

Under the Shanghai Stock Exchange’s rules governing the STAR Market, Research (Shanghai), Inc. was required to file a Record of January 2026 Investor Relations Activity. ACM Research then furnished this record, in translation, to U.S. investors through its Form 8-K.

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Accepted by SEC EDGAR 02/04/2026 - 05:08 PM EST Learn about SEC filing dates

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): January 29, 2026

ACM Research, Inc.

(Exact Name of Registrant as Specified in its Charter)

Delaware			001-38273			94-3290283
(State or Other Jurisdiction of Incorporation)			(Commission File Number)			(IRS Employer Identification No.)

42307 Osgood Road, Suite I Fremont, California			94539
(Address of Principal Executive Offices)			(Zip Code)

Registrant’s telephone number, including area code: (510) 445-3700

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading symbol

Name of each exchange on which registered

Class A Common Stock, par value $0.0001 per share

ACMR

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934:Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Item 8.01 Other Events.

The shares of our operating subsidiary ACM Research (Shanghai), Inc. (“ACM Shanghai”) are listed on the Sci-Tech innovation board (the “STAR Market”) of the Shanghai Stock Exchange (the “SSE”). In accordance with the SSE’s rules governing the STAR Market, ACM Shanghai filed with the SSE a Record of January 2026 Investor Relations Activity (the “Record”). The SSE posted the Record to the SSE’s website on January 29, 2026. A copy of the Record is attached as Exhibit 99.1 hereto.

The information in this Current Report on Form 8-K, including Exhibit 99.1, is intended to be furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section, nor shall it be deemed to be incorporated by reference into any filing of ACM Research, Inc. under the Securities Act of 1933, as amended.

Item 9.01    Financial Statements and Exhibits.

(d)    Exhibits.

Exhibit						Description
99.1* 104						Record of January 2026 Investor Relations Activity filed by ACM Research (Shanghai), Inc. with the Shanghai Stock Exchange on January 29, 2026 Cover Page Interactive Data File (embedded within the XBRL document)

* Unofficial English translation of original document prepared in Mandarin Chinese.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

ACM RESEARCH, INC.

By:    /s/ Mark McKechnie________________________

    Mark McKechnie

Chief Financial Officer and Treasurer

Dated: February 4, 2026

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