---
schema_version: "secwatch.filing_event.v1"
accession: "0001680062-25-000023"
form_type: "8-K"
ticker: "ACMR"
cik: "0001680062"
company_name: "ACM Research, Inc."
filed_at: "2025-09-24T23:59:59+00:00"
generated_at: "2026-05-17T05:47:48.480015+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# ACM Shanghai subsidiary raises $630M private placement; ACM stake drops to 74.5%

## Summary
- ACM Shanghai issued 38.6M ordinary shares at RMB 116.11 per share, gross proceeds approx. $630M.
- Net proceeds of $624M for R&D, capex, and working capital.
- Allocation to 17 qualified investors, all cash; six-month lock-up before STAR Market trading.
- ACM ownership decreases from 81.1% to 74.5%; ACM remains controlling shareholder.
- Private offering reported on Shanghai Stock Exchange website as required by STAR Market rules.

## SEC filing metadata
- accession: 0001680062-25-000023
- form_type: 8-K
- ticker: ACMR
- cik: 0001680062
- company_name: ACM Research, Inc.
- filed_at: 2025-09-24T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1680062/000168006225000023/0001680062-25-000023-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1680062/000168006225000023/acmr-20250924.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001680062-25-000023
- JSON: https://secwatch.observer/filing/0001680062-25-000023.json
- Plain text: https://secwatch.observer/filing/0001680062-25-000023.txt

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