OTTER TAIL CORPORATION 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.
- 2026-02-23: Fiscal year end 2025-12-31; Auditor Deloitte & Touche LLP; PCAOB firm ID 34; Location Minneapolis, Minnesota.
- 2026-02-18: Fiscal year end 2025-12-31; Auditor Deloitte & Touche LLP; PCAOB firm ID 34; Location Minneapolis, Minnesota.
- 2025-02-19: Fiscal year end 2024-12-31; Auditor Deloitte & Touche LLP; PCAOB firm ID 34; Location Minneapolis, Minnesota.
- 2024-02-14: Fiscal year end 2023-12-31; Auditor Deloitte & Touche LLP; PCAOB firm ID 34; Location Minneapolis, Minnesota.
| Filed | Fiscal year end | Auditor | PCAOB firm ID | Location | Internal-control attestation |
|---|
| 2026-02-23 | 2025-12-31 | Deloitte & Touche LLP | 34 | Minneapolis, Minnesota | Yes |
|---|
| 2026-02-18 | 2025-12-31 | Deloitte & Touche LLP | 34 | Minneapolis, Minnesota | Yes |
|---|
| 2025-02-19 | 2024-12-31 | Deloitte & Touche LLP | 34 | Minneapolis, Minnesota | Yes |
|---|
| 2024-02-14 | 2023-12-31 | Deloitte & Touche LLP | 34 | Minneapolis, Minnesota | Yes |
|---|
| 2023-02-15 | 2022-12-31 | Deloitte & Touche LLP | 34 | Minneapolis, Minnesota | Yes |
|---|
| 2022-02-16 | 2021-12-31 | Deloitte & Touche LLP | 34 | Minneapolis, Minnesota | Yes |
|---|
| 2021-02-19 | 2020-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | Yes |
|---|
| 2020-02-20 | 2019-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2019-02-22 | 2018-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2018-02-22 | 2017-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2017-02-22 | 2016-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2016-02-29 | 2015-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2015-03-02 | 2014-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2014-03-03 | 2013-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2013-02-27 | 2012-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2012-02-29 | 2011-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2011-02-28 | 2010-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|
| 2010-02-26 | 2009-12-31 | Deloitte & Touche LLP | | Minneapolis, Minnesota | |
|---|