---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-24-025892"
form_type: "8-K"
ticker: "ASYS"
cik: "0000720500"
company_name: "AMTECH SYSTEMS INC"
filed_at: "2024-03-05T23:59:59+00:00"
generated_at: "2026-06-05T04:24:16.942677+00:00"
event_type: "regulatory"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Amtech Systems dismisses Grant Thornton and appoints KPMG as new auditor

## Summary
- On March 1, 2024, Amtech Systems dismissed Grant Thornton as its independent auditor.
- Grant Thornton's audits for fiscal 2022 and 2023 contained no adverse opinions except for material weaknesses in internal control over financial reporting.
- Material weaknesses related to ineffective IT general controls and inadequate controls over non-routine and complex transactions.
- The Audit Committee appointed KPMG as the new independent auditor for the fiscal year ending September 30, 2024.

## SEC filing metadata
- accession: 0000950170-24-025892
- form_type: 8-K
- ticker: ASYS
- cik: 0000720500
- company_name: AMTECH SYSTEMS INC
- filed_at: 2024-03-05T23:59:59+00:00
- event_type: regulatory
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 4.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/720500/000095017024025892/0000950170-24-025892-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/720500/000095017024025892/asys-20240301.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-24-025892
- JSON: https://secwatch.observer/filing/0000950170-24-025892.json
- Plain text: https://secwatch.observer/filing/0000950170-24-025892.txt

## Key facts
- Auditor Changes
  AMTECH SYSTEMS INC dismissed Grant Thornton LLP as its auditor.
  - Action: dismissal
  - Auditor: Grant Thornton LLP
  - Successor: Klynveld Peat Marwick Goerdeler (KPMG)
  source text: On March 1, 2024, Amtech Systems, Inc. (the “Company”), upon the approval of the Audit Committee (the “Committee”) of the Board of Directors of the Company, notified Grant Thornton LLP (“Grant Thornton”), the Company’s current independent registered public accounting firm, that it would be dismissed from that position effective March 1, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/720500/000095017024025892/0000950170-24-025892-index.htm
- Auditor Changes
  AMTECH SYSTEMS INC engaged Klynveld Peat Marwick Goerdeler (KPMG) as its auditor.
  - Action: engagement
  - Auditor: Klynveld Peat Marwick Goerdeler (KPMG)
  source text: On March 1, 2024 the Committee appointed Klynveld Peat Marwick Goerdeler (“KPMG”) as the Company’s independent registered public accounting firm for the Company’s fiscal year ending September 30, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/720500/000095017024025892/0000950170-24-025892-index.htm

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