Otter Tail Corp — 8-K Filings
164 8-K filings on record
This page lists all 8-K filings submitted to the SEC by Otter Tail Corp (OTTR), sorted by most recent first. Each row links to the full filing on EdgarLookup. Otter Tail Corp has filed 164 8-K documents with the SEC since 2009. To view all SEC filings by Otter Tail Corp, see the full filings list.
All
10-K
10-K/A
10-Q
10-Q/A
144
15-12G
3
3/A
4
4/A
424B2
424B5
5
8-K
8-K/A
8-K12G3
ARS
CORRESP
CT ORDER
DEF 14A
DEFA14A
DEFR14A
FWP
POSASR
PRE 14A
S-3ASR
S-8
S-8 POS
SC 13D/A
SC 13G
SC 13G/A
SCHEDULE 13G/A
SD
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| 8-K | 8-K | 0001466593-26-000034 | Mar 23, 2026 | Mar 19, 2026 |
| 8-K | 8-K | 0001466593-26-000002 | Feb 17, 2026 | Feb 16, 2026 |
| 8-K | 8-K | 0001466593-25-000128 | Dec 18, 2025 | Dec 16, 2025 |
| 8-K | 8-K | 0001466593-25-000119 | Nov 4, 2025 | Nov 3, 2025 |
| 8-K | 8-K | 0001466593-25-000102 | Aug 5, 2025 | Aug 4, 2025 |
| 8-K | 8-K | 0001466593-25-000097 | Jun 6, 2025 | Jun 5, 2025 |
| 8-K | 8-K | 0001466593-25-000091 | Jun 5, 2025 | Jun 4, 2025 |
| 8-K | 8-K | 0001466593-25-000080 | May 6, 2025 | May 5, 2025 |
| 8-K | 8-K | 0001466593-25-000075 | Apr 17, 2025 | Apr 14, 2025 |
| 8-K | 8-K | 0001466593-25-000054 | Mar 31, 2025 | Mar 27, 2025 |
| 8-K | 8-K | 0001466593-25-000027 | Feb 18, 2025 | Feb 17, 2025 |
| 8-K | 8-K | 0001466593-24-000149 | Dec 31, 2024 | Dec 30, 2024 |
| 8-K | 8-K | 0001466593-24-000147 | Dec 16, 2024 | Dec 11, 2024 |
| 8-K | 8-K | 0001466593-24-000136 | Nov 5, 2024 | Nov 4, 2024 |
| 8-K | 8-K | 0001466593-24-000125 | Aug 6, 2024 | Aug 5, 2024 |
| 8-K | 8-K | 0001466593-24-000121 | Jun 5, 2024 | May 30, 2024 |
| 8-K | 8-K | 0001466593-24-000109 | May 7, 2024 | May 6, 2024 |
| 8-K | 8-K | 0001466593-24-000085 | Apr 10, 2024 | Apr 8, 2024 |
| 8-K | 8-K | 0001466593-24-000064 | Apr 5, 2024 | Apr 2, 2024 |
| 8-K | 8-K | 0001466593-24-000061 | Apr 2, 2024 | Mar 28, 2024 |
| 8-K | 8-K | 0001466593-24-000034 | Feb 13, 2024 | Feb 12, 2024 |
| 8-K | 8-K | 0001466593-24-000010 | Jan 29, 2024 | Jan 26, 2024 |
| 8-K | 8-K | 0001466593-23-000165 | Dec 21, 2023 | Dec 15, 2023 |
| 8-K | 8-K | 0001466593-23-000159 | Oct 31, 2023 | Oct 30, 2023 |
| 8-K | 8-K | 0001466593-23-000154 | Oct 4, 2023 | Oct 2, 2023 |
| 8-K | 8-K | 0001466593-23-000146 | Aug 1, 2023 | Jul 31, 2023 |
| 8-K | 8-K | 0001466593-23-000124 | May 2, 2023 | May 1, 2023 |
| 8-K | 8-K | 0001466593-23-000118 | Apr 19, 2023 | Apr 16, 2023 |
| 8-K | 8-K | 0001466593-23-000089 | Mar 31, 2023 | — |
| 8-K | 8-K | 0001466593-23-000050 | Feb 14, 2023 | Feb 13, 2023 |
| 8-K | 8-K | 0001466593-22-000084 | Dec 22, 2022 | Dec 21, 2022 |
| 8-K | 8-K | 0001466593-22-000070 | Nov 1, 2022 | Oct 31, 2022 |
| 8-K | 8-K | 0001466593-22-000060 | Oct 19, 2022 | Oct 14, 2022 |
| 8-K | 8-K | 0001466593-22-000054 | Sep 23, 2022 | Sep 21, 2022 |
| 8-K | 8-K | 0001466593-22-000048 | Aug 2, 2022 | Aug 1, 2022 |
| 8-K | 8-K | 0001466593-22-000035 | May 23, 2022 | May 20, 2022 |
| 8-K | 8-K | 0001466593-22-000027 | May 3, 2022 | May 2, 2022 |
| 8-K | 8-K | 0001466593-22-000023 | Apr 14, 2022 | Apr 11, 2022 |
| 8-K | 8-K | 0001466593-22-000006 | Feb 15, 2022 | Feb 14, 2022 |
| 8-K | 8-K | 0001466593-21-000080 | Dec 15, 2021 | Dec 14, 2021 |
| 8-K | 8-K | 0001466593-21-000076 | Dec 1, 2021 | Nov 29, 2021 |
| 8-K | 8-K | 0001466593-21-000070 | Nov 2, 2021 | Nov 1, 2021 |
| 8-K | 8-K | 0001466593-21-000063 | Oct 4, 2021 | Sep 30, 2021 |
| 8-K | 8-K | 0001466593-21-000061 | Sep 2, 2021 | Sep 1, 2021 |
| 8-K | 8-K | 0001466593-21-000052 | Aug 3, 2021 | Aug 2, 2021 |
| 8-K | 8-K | 0001466593-21-000048 | Jun 14, 2021 | Jun 10, 2021 |
| 8-K | 8-K | 0001466593-21-000034 | May 4, 2021 | May 3, 2021 |
| 8-K | 8-K | 0001466593-21-000019 | Apr 14, 2021 | Apr 12, 2021 |
| 8-K | 8-K | 0001466593-21-000003 | Feb 16, 2021 | Feb 15, 2021 |
| 8-K | FORM 8-K | 0001437749-20-022319 | Nov 3, 2020 | Nov 2, 2020 |