---
schema_version: "secwatch.filing_event.v1"
accession: "0001680062-26-000020"
form_type: "8-K"
ticker: "ACMR"
cik: "0001680062"
company_name: "ACM Research, Inc."
filed_at: "2026-02-06T23:59:59+00:00"
generated_at: "2026-05-16T04:06:15.643620+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# ACM Research sells 4.8M shares of subsidiary ACM Shanghai at RMB 160/share, lowering stake from 74.84% to 73.72%

## Summary
- Complete sale of 4,801,648 shares of ACM Shanghai (688082) at RMB 160.00 (~$23.05) per share via inquiry-based transfer on SSE.
- Aggregate ownership in ACM Shanghai declines from 74.84% to 73.72%; no change in control.
- Transfer price determined via inquiry with 38 institutional investors; 30 transferees include fund managers and QFIIs.
- Prior reductions by HUI WANG and Jian Wang in Nov 2025; combined concert-party stake now 73.72%.
- All transferred shares subject to 6-month lock-up period.

## SEC filing metadata
- accession: 0001680062-26-000020
- form_type: 8-K
- ticker: ACMR
- cik: 0001680062
- company_name: ACM Research, Inc.
- filed_at: 2026-02-06T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1680062/000168006226000020/0001680062-26-000020-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1680062/000168006226000020/acmr-20260206.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001680062-26-000020
- JSON: https://secwatch.observer/filing/0001680062-26-000020.json
- Plain text: https://secwatch.observer/filing/0001680062-26-000020.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.