---
schema_version: "secwatch.filing_event.v1"
accession: "0001140361-23-045244"
form_type: "8-K"
ticker: "ACMR"
cik: "0001680062"
company_name: "ACM Research, Inc."
filed_at: "2023-09-26T23:59:59+00:00"
generated_at: "2026-06-10T08:43:16.289621+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# ACM Research appoints Ernst & Young as new independent auditor for FY 2023

## Summary
- Audit Committee selected E&Y as independent auditor for fiscal year ending Dec 31, 2023, effective Sept 20, 2023.
- Prior auditor Armanino resigned effective Sept 20 due to its decision to exit public-company audit practice.
- No disagreements or reportable events with Armanino during FY2022, FY2021, or interim 2023 period.
- Company did not consult E&Y on any accounting, auditing, or financial reporting issue before engagement.

## SEC filing metadata
- accession: 0001140361-23-045244
- form_type: 8-K
- ticker: ACMR
- cik: 0001680062
- company_name: ACM Research, Inc.
- filed_at: 2023-09-26T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1680062/000114036123045244/0001140361-23-045244-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1680062/000114036123045244/ef20011135_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001140361-23-045244
- JSON: https://secwatch.observer/filing/0001140361-23-045244.json
- Plain text: https://secwatch.observer/filing/0001140361-23-045244.txt

## Key facts
- Auditor Changes
  ACM Research, Inc. engaged Ernst & Young Hua Ming LLP as its auditor.
  - Action: engagement
  - Auditor: Ernst & Young Hua Ming LLP
  source text: the Audit Committee approved the engagement of Ernst & Young Hua Ming LLP ("E&Y") as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2023. The engagement of E&Y became effective on September 20, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1680062/000114036123045244/0001140361-23-045244-index.htm

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