AAON, 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.
- 2026-03-02: Fiscal year end 2025-12-31; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Tulsa, Oklahoma.
- 2025-02-27: Fiscal year end 2024-12-31; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Tulsa, Oklahoma.
- 2024-02-28: Fiscal year end 2023-12-31; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Tulsa, Oklahoma.
- 2023-02-27: Fiscal year end 2022-12-31; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Tulsa, Oklahoma.
| Filed | Fiscal year end | Auditor | PCAOB firm ID | Location | Internal-control attestation |
|---|
| 2026-03-02 | 2025-12-31 | GRANT THORNTON LLP | 248 | Tulsa, Oklahoma | Yes |
|---|
| 2025-02-27 | 2024-12-31 | GRANT THORNTON LLP | 248 | Tulsa, Oklahoma | Yes |
|---|
| 2024-02-28 | 2023-12-31 | GRANT THORNTON LLP | 248 | Tulsa, Oklahoma | Yes |
|---|
| 2023-02-27 | 2022-12-31 | GRANT THORNTON LLP | 248 | Tulsa, Oklahoma | Yes |
|---|
| 2022-02-28 | 2021-12-31 | GRANT THORNTON LLP | 248 | Tulsa, Oklahoma | Yes |
|---|
| 2021-02-25 | 2020-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | Yes |
|---|
| 2020-02-27 | 2019-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2019-02-28 | 2018-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2018-02-27 | 2017-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2017-02-23 | 2016-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2016-02-25 | 2015-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2015-02-27 | 2014-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2014-03-13 | 2013-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2013-03-14 | 2012-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2012-03-14 | 2011-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2011-03-10 | 2010-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|
| 2009-03-11 | 2008-12-31 | GRANT THORNTON LLP | | Tulsa, Oklahoma | |
|---|