AMTECH SYSTEMS, INC. Auditor
The independent registered public accounting firm that signed the audit report in each annual report on Form 10-K, newest first. PCAOB firm ID and the internal-control attestation are as tagged on the cover from fiscal 2021; earlier rows come from the signed report text.
- 2025-12-10: Fiscal year end 2025-09-30; Auditor KPMG LLP; PCAOB firm ID 185; Location Phoenix, Arizona.
- 2024-12-12: Fiscal year end 2024-09-30; Auditor KPMG LLP; PCAOB firm ID 185; Location Phoenix, Arizona.
- 2023-12-14: Fiscal year end 2023-09-30; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Phoenix, Arizona.
- 2022-11-30: Fiscal year end 2022-09-30; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Phoenix, Arizona.
| Filed | Fiscal year end | Auditor | PCAOB firm ID | Location | Internal-control attestation |
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| 2025-12-10 | 2025-09-30 | KPMG LLP | 185 | Phoenix, Arizona | No |
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| 2024-12-12 | 2024-09-30 | KPMG LLP | 185 | Phoenix, Arizona | Yes |
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| 2023-12-14 | 2023-09-30 | GRANT THORNTON LLP | 248 | Phoenix, Arizona | Yes |
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| 2022-11-30 | 2022-09-30 | GRANT THORNTON LLP | 248 | Phoenix, Arizona | No |
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