ACM Research, Inc. 8-K

What Happened
ACM Research, Inc. (ACMR) reported on Form 8-K (filed May 22, 2026) that its operating subsidiary, ACM Research (Shanghai), Inc. (“ACM Shanghai”), which is listed on the Shanghai Stock Exchange’s Sci‑Tech Innovation Board (STAR Market), submitted a Record of May 2026 Investor Relations Activity to the SSE. The Shanghai Stock Exchange posted that Record on May 19, 2026. A copy of the Record is attached to the 8-K as Exhibit 99.1. The filing notes the information is being furnished (not “filed”) under SEC rules.

Key Details

• ACM Shanghai is listed on the SSE STAR Market; the Record of Investor Relations Activity was posted by the SSE on May 19, 2026.
• The Record filed by ACM Shanghai is included as Exhibit 99.1 to ACM Research’s Form 8-K.
• ACM Research’s Form 8-K was signed by CFO Mark McKechnie and dated May 22, 2026.
• The company states the furnished material is not subject to Section 18 liability and is not incorporated by reference into other filings.

Why It Matters
This filing provides investors with the subsidiary’s recent investor‑relations disclosure as required by the SSE, improving transparency about communications with shareholders and the market for ACM Shanghai. Retail investors who follow ACM Research or its Shanghai‑listed subsidiary should review Exhibit 99.1 (or the SSE posting) for the specific investor‑relations content and any operational or financial context included in that Record.