Otter Tail Corp — All Filings
843 total filings on record
Public companies registered with the SEC are required to file periodic reports, disclosures, and notices throughout the year. The most important are the 10-K (annual report), 10-Q (quarterly report), and 8-K (material event notice). Use the filters below to narrow by form type.
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10-K
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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
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S-3ASR
S-8
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SC 13D/A
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SCHEDULE 13G/A
SD
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| SCHEDULE 13G/A | — | 0000102909-26-001980 | Mar 27, 2026 | — |
| 8-K | 8-K | 0001466593-26-000034 | Mar 23, 2026 | Mar 19, 2026 |
| ARS | ARS | 0001466593-26-000025 | Mar 2, 2026 | Dec 31, 2025 |
| DEFA14A | DEFA14A | 0001466593-26-000024 | Mar 2, 2026 | — |
| DEF 14A | DEF 14A | 0001466593-26-000023 | Mar 2, 2026 | Apr 13, 2026 |
| 10-K/A | 10-K/A | 0001466593-26-000015 | Feb 23, 2026 | Dec 31, 2025 |
| PRE 14A | PRE 14A | 0001466593-26-000010 | Feb 18, 2026 | Apr 13, 2026 |
| 10-K | 10-K | 0001466593-26-000008 | Feb 18, 2026 | Dec 31, 2025 |
| 8-K | 8-K | 0001466593-26-000002 | Feb 17, 2026 | Feb 16, 2026 |
| 4 | FORM 4 | 0001639060-26-000006 | Feb 12, 2026 | Feb 10, 2026 |
| 4 | FORM 4 | 0001605621-26-000005 | Feb 12, 2026 | Feb 10, 2026 |
| 4 | FORM 4 | 0001278053-26-000005 | Feb 12, 2026 | Feb 10, 2026 |
| 4 | FORM 4 | 0001559334-26-000004 | Feb 12, 2026 | Feb 10, 2026 |
| 4 | FORM 4 | 0001726153-26-000005 | Feb 12, 2026 | Feb 10, 2026 |
| 4 | FORM 4 | 0002002077-26-000005 | Feb 12, 2026 | Feb 10, 2026 |
| 4 | FORM 4 | 0002002077-26-000002 | Feb 9, 2026 | Feb 6, 2026 |
| 4 | FORM 4 | 0001605621-26-000002 | Feb 9, 2026 | Feb 6, 2026 |
| 4 | FORM 4 | 0001278053-26-000002 | Feb 9, 2026 | Feb 6, 2026 |
| 4 | FORM 4 | 0001639060-26-000002 | Feb 9, 2026 | Feb 6, 2026 |
| 4 | FORM 4 | 0001559334-26-000002 | Feb 9, 2026 | Feb 6, 2026 |
| 4 | FORM 4 | 0001726153-26-000002 | Feb 9, 2026 | Feb 6, 2026 |
| 3 | FORM 3 | 0001297719-26-000003 | Jan 6, 2026 | Jan 1, 2026 |
| 3 | FORM 3 | 0001629899-26-000003 | Jan 6, 2026 | Jan 1, 2026 |
| 8-K | 8-K | 0001466593-25-000128 | Dec 18, 2025 | Dec 16, 2025 |
| 10-Q | 10-Q | 0001466593-25-000122 | Nov 5, 2025 | Sep 30, 2025 |
| 8-K | 8-K | 0001466593-25-000119 | Nov 4, 2025 | Nov 3, 2025 |
| 10-Q | 10-Q | 0001466593-25-000107 | Aug 6, 2025 | Jun 30, 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 |
| SD | SD | 0001466593-25-000088 | May 30, 2025 | — |
| 10-Q | 10-Q | 0001466593-25-000083 | May 7, 2025 | Mar 31, 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 |
| 4 | FORM 4 | 0001466593-25-000072 | Apr 14, 2025 | Apr 13, 2025 |
| 4 | FORM 4 | 0001466593-25-000070 | Apr 14, 2025 | Apr 13, 2025 |
| 4 | FORM 4 | 0001466593-25-000068 | Apr 14, 2025 | Apr 13, 2025 |
| 4 | FORM 4 | 0001466593-25-000066 | Apr 14, 2025 | Apr 13, 2025 |
| 4 | FORM 4 | 0001466593-25-000064 | Apr 14, 2025 | Apr 13, 2025 |
| 4 | FORM 4 | 0001466593-25-000062 | Apr 14, 2025 | Apr 13, 2025 |
| 4 | FORM 4 | 0001466593-25-000060 | Apr 14, 2025 | Apr 13, 2025 |
| 4 | FORM 4 | 0001466593-25-000058 | Apr 14, 2025 | Apr 13, 2025 |
| 4 | FORM 4 | 0001466593-25-000056 | Apr 9, 2025 | Apr 8, 2025 |
| 8-K | 8-K | 0001466593-25-000054 | Mar 31, 2025 | Mar 27, 2025 |
| ARS | ARS | 0001466593-25-000051 | Mar 3, 2025 | Dec 31, 2024 |
| DEF 14A | DEF 14A | 0001466593-25-000049 | Mar 3, 2025 | Dec 31, 2024 |
| DEFA14A | DEFA14A | 0001466593-25-000047 | Mar 3, 2025 | — |
| 10-K | 10-K | 0001466593-25-000034 | Feb 19, 2025 | Dec 31, 2024 |
| 8-K | 8-K | 0001466593-25-000027 | Feb 18, 2025 | Feb 17, 2025 |
| 4 | FORM 4 | 0001466593-25-000023 | Feb 13, 2025 | Feb 11, 2025 |