Browse the latest SEC filings and forms submitted by Otter Tail Corp (OTTR). Access annual reports, quarterly statements, and other official disclosures.
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Search Company Filings →| Form | Filing Date | Description | Link |
|---|---|---|---|
| SCHEDULE 13G/A | March 27, 2026 | - | View Document |
| 8-K | March 23, 2026 | 8-K | View Document |
| DEF 14A | March 2, 2026 | DEF 14A | View Document |
| DEFA14A | March 2, 2026 | DEFA14A | View Document |
| ARS | March 2, 2026 | ARS | View Document |
| 10-K/A | Feb. 23, 2026 | 10-K/A | View Document |
| PRE 14A | Feb. 18, 2026 | PRE 14A | View Document |
| 10-K | Feb. 18, 2026 | 10-K | View Document |
| 8-K | Feb. 17, 2026 | 8-K | View Document |
| 4 | Feb. 12, 2026 | FORM 4 | View Document |
| 4 | Feb. 12, 2026 | FORM 4 | View Document |
| 4 | Feb. 12, 2026 | FORM 4 | View Document |
| 4 | Feb. 12, 2026 | FORM 4 | View Document |
| 4 | Feb. 12, 2026 | FORM 4 | View Document |
| 4 | Feb. 12, 2026 | FORM 4 | View Document |
| 4 | Feb. 9, 2026 | FORM 4 | View Document |
| 4 | Feb. 9, 2026 | FORM 4 | View Document |
| 4 | Feb. 9, 2026 | FORM 4 | View Document |
| 4 | Feb. 9, 2026 | FORM 4 | View Document |
| 4 | Feb. 9, 2026 | FORM 4 | View Document |
| 4 | Feb. 9, 2026 | FORM 4 | View Document |
| 3 | Jan. 6, 2026 | FORM 3 | View Document |
| 3 | Jan. 6, 2026 | FORM 3 | View Document |
| 8-K | Dec. 18, 2025 | 8-K | View Document |
| 10-Q | Nov. 5, 2025 | 10-Q | View Document |
| 8-K | Nov. 4, 2025 | 8-K | View Document |
| 10-Q | Aug. 6, 2025 | 10-Q | View Document |
| 8-K | Aug. 5, 2025 | 8-K | View Document |
| 8-K | June 6, 2025 | 8-K | View Document |
| 8-K | June 5, 2025 | 8-K | View Document |
| SD | May 30, 2025 | SD | View Document |
| 10-Q | May 7, 2025 | 10-Q | View Document |
| 8-K | May 6, 2025 | 8-K | View Document |
| 8-K | April 17, 2025 | 8-K | View Document |
| 4 | April 14, 2025 | FORM 4 | View Document |
| 4 | April 14, 2025 | FORM 4 | View Document |
| 4 | April 14, 2025 | FORM 4 | View Document |
| 4 | April 14, 2025 | FORM 4 | View Document |
| 4 | April 14, 2025 | FORM 4 | View Document |
| 4 | April 14, 2025 | FORM 4 | View Document |
| 4 | April 14, 2025 | FORM 4 | View Document |
| 4 | April 14, 2025 | FORM 4 | View Document |
| 4 | April 9, 2025 | FORM 4 | View Document |
| 8-K | March 31, 2025 | 8-K | View Document |
| ARS | March 3, 2025 | ARS | View Document |
| DEF 14A | March 3, 2025 | DEF 14A | View Document |
| DEFA14A | March 3, 2025 | DEFA14A | View Document |
| 10-K | Feb. 19, 2025 | 10-K | View Document |
| 8-K | Feb. 18, 2025 | 8-K | View Document |
| 4 | Feb. 13, 2025 | FORM 4 | View Document |
| 4 | Feb. 13, 2025 | FORM 4 | View Document |
| 4 | Feb. 13, 2025 | FORM 4 | View Document |
| 4 | Feb. 13, 2025 | FORM 4 | View Document |
| 4 | Feb. 13, 2025 | FORM 4 | View Document |
| 4 | Feb. 13, 2025 | FORM 4 | View Document |
| 4 | Feb. 7, 2025 | FORM 4 | View Document |
| 4 | Feb. 7, 2025 | FORM 4 | View Document |
| 4 | Feb. 7, 2025 | FORM 4 | View Document |
| 4 | Feb. 7, 2025 | FORM 4 | View Document |
| 4 | Feb. 7, 2025 | FORM 4 | View Document |
| 4 | Feb. 7, 2025 | FORM 4 | View Document |
| 8-K | Dec. 31, 2024 | 8-K | View Document |
| 8-K | Dec. 16, 2024 | 8-K | View Document |
| 10-Q | Nov. 7, 2024 | 10-Q | View Document |
| 8-K | Nov. 5, 2024 | 8-K | View Document |
| SC 13D/A | Oct. 3, 2024 | SC 13D/A | View Document |
| 4 | Aug. 14, 2024 | FORM 4 | View Document |
| 144 | Aug. 13, 2024 | - | View Document |
| 10-Q | Aug. 7, 2024 | 10-Q | View Document |
| 8-K | Aug. 6, 2024 | 8-K | View Document |
| 8-K | June 5, 2024 | 8-K | View Document |
| 4 | May 28, 2024 | FORM 4 | View Document |
| SD | May 24, 2024 | SD | View Document |
| 144 | May 24, 2024 | - | View Document |
| 10-Q | May 8, 2024 | 10-Q | View Document |
| 8-K | May 7, 2024 | 8-K | View Document |
| S-3ASR | May 3, 2024 | S-3ASR | View Document |
| S-3ASR | May 3, 2024 | S-3ASR | View Document |
| 8-K | April 10, 2024 | 8-K | View Document |
| 4 | April 9, 2024 | FORM 4 | View Document |
| 4 | April 9, 2024 | FORM 4 | View Document |
| 4 | April 9, 2024 | FORM 4 | View Document |
| 4 | April 9, 2024 | FORM 4 | View Document |
| 4 | April 9, 2024 | FORM 4 | View Document |
| 4 | April 9, 2024 | FORM 4 | View Document |
| 4 | April 9, 2024 | FORM 4 | View Document |
| 4 | April 9, 2024 | FORM 4 | View Document |
| 4 | April 9, 2024 | FORM 4 | View Document |
| 8-K | April 5, 2024 | 8-K | View Document |
| 8-K | April 2, 2024 | 8-K | View Document |
| 4 | March 13, 2024 | FORM 4 | View Document |
| ARS | Feb. 28, 2024 | ARS | View Document |
| DEF 14A | Feb. 28, 2024 | DEF 14A | View Document |
| DEFA14A | Feb. 28, 2024 | DEFA14A | View Document |
| 10-K | Feb. 14, 2024 | 10-K | View Document |
| 8-K | Feb. 13, 2024 | 8-K | View Document |
| SC 13G/A | Feb. 13, 2024 | SCHEDULE 13G/A | View Document |
| 4 | Feb. 8, 2024 | FORM 4 | View Document |
| 4 | Feb. 8, 2024 | FORM 4 | View Document |
| 4 | Feb. 8, 2024 | FORM 4 | View Document |
| 4 | Feb. 8, 2024 | FORM 4 | View Document |
| 4 | Feb. 8, 2024 | FORM 4 | View Document |
| 4 | Feb. 8, 2024 | FORM 4 | View Document |
| 8-K | Jan. 29, 2024 | 8-K | View Document |
| 5 | Jan. 23, 2024 | FORM 5 | View Document |
| 5 | Jan. 23, 2024 | FORM 5 | View Document |
| SC 13G/A | Jan. 22, 2024 | - | View Document |
| 3 | Jan. 8, 2024 | FORM 3 | View Document |
| 4 | Jan. 2, 2024 | FORM 4 | View Document |
| 8-K | Dec. 21, 2023 | 8-K | View Document |
| 144 | Nov. 20, 2023 | - | View Document |
| 4 | Nov. 20, 2023 | FORM 4 | View Document |
| 10-Q | Nov. 3, 2023 | 10-Q | View Document |
| 8-K | Oct. 31, 2023 | 8-K | View Document |
| 8-K | Oct. 4, 2023 | 8-K | View Document |
| 10-Q | Aug. 2, 2023 | 10-Q | View Document |
| 8-K | Aug. 1, 2023 | 8-K | View Document |
| 8-K/A | June 20, 2023 | 8-K/A | View Document |
| SD | May 25, 2023 | SD | View Document |
| 10-Q | May 3, 2023 | 10-Q | View Document |
| 8-K | May 2, 2023 | 8-K | View Document |
| 4 | April 19, 2023 | FORM 4 | View Document |
| 4 | April 19, 2023 | FORM 4 | View Document |
| 4 | April 19, 2023 | FORM 4 | View Document |
| 4 | April 19, 2023 | FORM 4 | View Document |
| 4 | April 19, 2023 | FORM 4 | View Document |
| 4 | April 19, 2023 | FORM 4 | View Document |
| 4 | April 19, 2023 | FORM 4 | View Document |
| 8-K | April 19, 2023 | 8-K | View Document |
| 4 | April 19, 2023 | FORM 4 | View Document |
| 4 | April 19, 2023 | FORM 4 | View Document |
| S-8 | April 17, 2023 | S-8 | View Document |
| 8-K | March 31, 2023 | 8-K | View Document |
| SC 13G/A | March 8, 2023 | - | View Document |
| DEFR14A | March 7, 2023 | DEFR14A | View Document |
| DEFA14A | March 7, 2023 | DEFA14A | View Document |
| ARS | March 1, 2023 | ARS | View Document |
| DEF 14A | March 1, 2023 | DEF 14A | View Document |
| 10-K | Feb. 15, 2023 | 10-K | View Document |
| 8-K | Feb. 14, 2023 | 8-K | View Document |
| 4 | Feb. 9, 2023 | FORM 4 | View Document |
| SC 13G/A | Feb. 9, 2023 | SCHEDULE 13G/A | View Document |
| 4 | Feb. 9, 2023 | FORM 4 | View Document |
| 4 | Feb. 9, 2023 | FORM 4 | View Document |
| 4 | Feb. 9, 2023 | FORM 4 | View Document |
| 4 | Feb. 9, 2023 | FORM 4 | View Document |
| 4 | Feb. 9, 2023 | FORM 4 | View Document |
| 4 | Feb. 8, 2023 | FORM 4 | View Document |
| 4 | Feb. 8, 2023 | FORM 4 | View Document |
| 4 | Feb. 8, 2023 | FORM 4 | View Document |
| 4 | Feb. 8, 2023 | FORM 4 | View Document |
| 4 | Feb. 8, 2023 | FORM 4 | View Document |
| 4 | Feb. 8, 2023 | FORM 4 | View Document |
| SC 13G/A | Jan. 31, 2023 | - | View Document |
| 5 | Jan. 24, 2023 | FORM 5 | View Document |
| 3 | Jan. 10, 2023 | FORM 3 | View Document |
| 3 | Jan. 10, 2023 | FORM 3 | View Document |
| 4 | Jan. 3, 2023 | FORM 4 | View Document |
| 8-K | Dec. 22, 2022 | 8-K | View Document |
| 4 | Nov. 22, 2022 | FORM 4 | View Document |
| 10-Q | Nov. 2, 2022 | 10-Q | View Document |
| 8-K | Nov. 1, 2022 | 8-K | View Document |
| 8-K | Oct. 19, 2022 | 8-K | View Document |
| 4 | Oct. 3, 2022 | FORM 4 | View Document |
| 8-K | Sept. 23, 2022 | 8-K | View Document |
| 10-Q | Aug. 3, 2022 | 10-Q | View Document |
| 8-K | Aug. 2, 2022 | 8-K | View Document |
| 4 | July 1, 2022 | FORM 4 | View Document |
| 4 | July 1, 2022 | FORM 4 | View Document |
| SD | May 27, 2022 | SD | View Document |
| 8-K | May 23, 2022 | 8-K | View Document |
| 10-Q | May 4, 2022 | 10-Q | View Document |
| 8-K | May 3, 2022 | 8-K | View Document |
| 8-K | April 14, 2022 | 8-K | View Document |
| 4 | April 13, 2022 | PARTAIN4112022 | View Document |
| 4 | April 12, 2022 | FORM 4 | View Document |
| 4 | April 12, 2022 | BOHN04112022 | View Document |
| 4 | April 12, 2022 | FRITZE04112022 | View Document |
| 4 | April 12, 2022 | STAKE04112022 | View Document |
| 4 | April 12, 2022 | WEBB04112022 | View Document |
| 4 | April 12, 2022 | JOHNSON04112022 | View Document |
| 4 | April 12, 2022 | FORM 4 | View Document |
| 4 | April 1, 2022 | LEBEAU3312022 | View Document |
| DEF 14A | March 2, 2022 | DEF 14A | View Document |
| 10-K | Feb. 16, 2022 | 10-K | View Document |
| 8-K | Feb. 15, 2022 | 8-K | View Document |
| 4 | Feb. 9, 2022 | SMESTAD2/7/2022 | View Document |
| 4 | Feb. 9, 2022 | MOUG2/7/2022 | View Document |
| 4 | Feb. 9, 2022 | MACFARLANE2072022 | View Document |
| SC 13G/A | Feb. 9, 2022 | SCHEDULE 13G/A | View Document |
| 4 | Feb. 8, 2022 | ABBOTT2062022 | View Document |
| 4 | Feb. 8, 2022 | KNUTSON2062022 | View Document |
| 4 | Feb. 8, 2022 | ABBOTT2072022 | View Document |
| 4 | Feb. 8, 2022 | ROGELSTAD2072022 | View Document |
| 4 | Feb. 8, 2022 | KNUTSON2072027 | View Document |
| 4 | Feb. 8, 2022 | ROGELSTAD02062022 | View Document |
| 4 | Feb. 7, 2022 | MOUG20622 | View Document |
| 4 | Feb. 7, 2022 | SMESTAD2062022 | View Document |
| 4 | Feb. 7, 2022 | MACFARLANE2062022 | View Document |
| SC 13G/A | Feb. 3, 2022 | - | View Document |
| 5 | Jan. 24, 2022 | MACFARLANE01242022 | View Document |
| 5 | Jan. 24, 2022 | PARTAIN01242022 | View Document |
| 3 | Jan. 4, 2022 | LEBEAU01012022 | View Document |
| 8-K | Dec. 15, 2021 | 8-K | View Document |
| 4 | Dec. 7, 2021 | O'KEEFE12072021 | View Document |
| 8-K | Dec. 1, 2021 | 8-K | View Document |
| 4 | Nov. 18, 2021 | ERICKSON11172021 | View Document |
| 10-Q | Nov. 3, 2021 | 10-Q | View Document |
| 8-K | Nov. 2, 2021 | 8-K | View Document |
| 8-K | Oct. 4, 2021 | 8-K | View Document |
| 8-K | Sept. 2, 2021 | 8-K | View Document |
| 10-Q | Aug. 6, 2021 | 10-Q | View Document |
| 8-K | Aug. 3, 2021 | 8-K | View Document |
| 8-K | June 14, 2021 | 8-K | View Document |
| SD | May 28, 2021 | SD | View Document |
| SC 13G/A | May 10, 2021 | SCHEDULE 13G/A | View Document |
| 10-Q | May 7, 2021 | 10-Q | View Document |
| 8-K | May 4, 2021 | 8-K | View Document |
| S-3ASR | May 3, 2021 | S-3ASR | View Document |
| S-3ASR | May 3, 2021 | S-3 | View Document |
| 8-K | April 14, 2021 | 8-K | View Document |
| 4 | April 13, 2021 | STAKE04122021 | View Document |
| 4 | April 13, 2021 | WEBB04122021 | View Document |
| 4 | April 13, 2021 | PARTAIN04122021 | View Document |
| 4 | April 13, 2021 | O'KEEFE04122021 | View Document |
| 4 | April 13, 2021 | JOHNSON04122021 | View Document |
| 4 | April 13, 2021 | FRITZE04122021 | View Document |
| 4 | April 13, 2021 | ERICKSON04122021 | View Document |
| 4 | April 13, 2021 | BOHN4122021 | View Document |
| 4 | April 9, 2021 | SMESTAD04082021 | View Document |
| DEF 14A | March 3, 2021 | DEF 14A | View Document |
| 10-K | Feb. 19, 2021 | 10-K | View Document |
| PRE 14A | Feb. 17, 2021 | PRE 14A | View Document |
| 8-K | Feb. 16, 2021 | 8-K | View Document |
| 4 | Feb. 12, 2021 | MOUG02102021 | View Document |
| 4 | Feb. 12, 2021 | MACFARLANE21021 | View Document |
| 4 | Feb. 12, 2021 | ROGELSTAD02102021 | View Document |
| 4 | Feb. 12, 2021 | ABBOTT02102021 | View Document |
| 4 | Feb. 12, 2021 | KNUTSON20102021 | View Document |
| 4 | Feb. 12, 2021 | SMESTAD02102021 | View Document |
| SC 13G/A | Feb. 10, 2021 | SCHEDULE 13G/A | View Document |
| 4 | Feb. 9, 2021 | KNUTSON020621 | View Document |
| 4 | Feb. 9, 2021 | ABBOTT020621 | View Document |
| 4 | Feb. 9, 2021 | ROGELSTAD020621 | View Document |
| 4 | Feb. 9, 2021 | SMESTAD020621 | View Document |
| 4 | Feb. 9, 2021 | MACFARLANE020621 | View Document |
| 4 | Feb. 9, 2021 | MOUG020621 | View Document |
| SC 13G/A | Jan. 29, 2021 | - | View Document |
| 10-Q | Nov. 6, 2020 | FORM 10-Q | View Document |
| 8-K | Nov. 3, 2020 | FORM 8-K | View Document |
| 8-K | Nov. 2, 2020 | FORM 8-K | View Document |
| 8-K | Aug. 20, 2020 | FORM 8-K | View Document |
| 10-Q | Aug. 7, 2020 | FORM 10-Q | View Document |
| 8-K | Aug. 4, 2020 | FORM 8-K | View Document |
| SD | May 29, 2020 | FORM SD | View Document |
| 10-Q | May 8, 2020 | FORM 10-Q | View Document |
| 8-K | May 6, 2020 | FORM 8-K | View Document |
| 4 | April 22, 2020 | 042020JOHNSON | View Document |
| 8-K | April 22, 2020 | FORM 8-K | View Document |
| 4 | April 22, 2020 | 042020STAKE | View Document |
| 4 | April 22, 2020 | 042020PARTAIN | View Document |
| 4 | April 22, 2020 | 042020O'KEEFE | View Document |
| 4 | April 22, 2020 | 42020BOHN | View Document |
| 4 | April 22, 2020 | 042020FRITZE | View Document |
| 4 | April 22, 2020 | 042020ERICKSON | View Document |
| 4 | April 22, 2020 | 042020WEBB | View Document |
| 4 | April 10, 2020 | 040820SMESTAD | View Document |
| 8-K | March 20, 2020 | FORM 8-K | View Document |
| DEFA14A | March 20, 2020 | DEFA14A | View Document |
| 8-K | March 17, 2020 | FORM 8-K | View Document |
| 4 | March 16, 2020 | 03122020ABBOTT | View Document |
| DEF 14A | March 9, 2020 | DEF 14A | View Document |
| 8-K | Feb. 26, 2020 | FORM 8-K | View Document |
| SC 13D/A | Feb. 24, 2020 | SC 13D/A | View Document |
| 10-K | Feb. 20, 2020 | FORM 10-K | View Document |
| 8-K | Feb. 18, 2020 | FORM 8-K | View Document |
| 4 | Feb. 14, 2020 | KNUTSON021220 | View Document |
| 4 | Feb. 14, 2020 | ABBOTT021220 | View Document |
| 4 | Feb. 14, 2020 | SMESTAD021220 | View Document |
| 4 | Feb. 14, 2020 | ROGELSTAD021220 | View Document |
| 4 | Feb. 14, 2020 | MACFARLANE021220 | View Document |
| 4 | Feb. 14, 2020 | MOUG021220 | View Document |
| SC 13G/A | Feb. 12, 2020 | SCHEDULE 13G/A | View Document |
| 4 | Feb. 10, 2020 | MACFARLANE020620 | View Document |
| 4 | Feb. 10, 2020 | KNUTSON020620 | View Document |
| 4 | Feb. 10, 2020 | 020620SMESTAD | View Document |
| 4 | Feb. 10, 2020 | 020620ABBOTT | View Document |
| 4 | Feb. 10, 2020 | 020620ROGELSTAD | View Document |
| 4 | Feb. 10, 2020 | 02/06/20MOUG | View Document |
| SC 13G/A | Feb. 5, 2020 | - | View Document |
| 8-K | Dec. 27, 2019 | FORM 8-K | View Document |
| 4 | Nov. 21, 2019 | ERICKSON112019 | View Document |
| 424B5 | Nov. 8, 2019 | 424B5 | View Document |
| 10-Q | Nov. 8, 2019 | FORM 10-Q | View Document |
| 8-K | Nov. 8, 2019 | FORM 8-K | View Document |
| 8-K | Nov. 5, 2019 | FORM 8-K | View Document |
| 8-K | Oct. 11, 2019 | FORM 8-K | View Document |
| 8-K | Sept. 16, 2019 | FORM 8-K | View Document |
| 10-Q | Aug. 9, 2019 | FORM 10-Q | View Document |
| 8-K | Aug. 6, 2019 | FORM 8-K | View Document |
| 8-K | July 16, 2019 | FORM 8-K | View Document |
| 8-K | June 11, 2019 | FORM 8-K | View Document |
| SD | May 31, 2019 | FORM SD | View Document |
| 10-Q | May 9, 2019 | FORM 10-Q | View Document |
| 8-K | May 7, 2019 | FORM 8-K | View Document |
| 4 | April 10, 2019 | 4/08/2019SMESTAD | View Document |
| 4 | April 10, 2019 | 4082019PARTAIN | View Document |
| 4 | April 10, 2019 | 4/08/2019STAKE | View Document |
| 4 | April 10, 2019 | 4082019ERICKSON | View Document |
| 4 | April 10, 2019 | 4/08/2019WEBB | View Document |
| 4 | April 10, 2019 | 4/08/2019JOHNSON | View Document |
| 4 | April 10, 2019 | 4/08/2019BOHN | View Document |
| 4 | April 10, 2019 | 4/08/2019FRITZE | View Document |
| 4 | April 10, 2019 | 4/08/2019OKEEFE | View Document |
| 8-K | April 9, 2019 | FORM 8-K | View Document |
| 3/A | March 26, 2019 | 032619SMESTAD | View Document |
| DEF 14A | Feb. 27, 2019 | DEF 14A | View Document |
| 4 | Feb. 25, 2019 | 02222019KNUTSON | View Document |
| 10-K | Feb. 22, 2019 | FORM 10-K | View Document |
| 4/A | Feb. 20, 2019 | 021319AMACFARLANE | View Document |
| 8-K | Feb. 19, 2019 | FORM 8-K | View Document |
| 4 | Feb. 15, 2019 | 02132019SMESTAD | View Document |
| 4 | Feb. 14, 2019 | 02132019ABBOTT | View Document |
| 4 | Feb. 14, 2019 | 02132019ROGELSTAD | View Document |
| 4 | Feb. 14, 2019 | 02132018MACFARLANE | View Document |
| 4 | Feb. 14, 2019 | 02132019MOUG | View Document |
| 4 | Feb. 14, 2019 | 02132019KNUTSON | View Document |
| SC 13G/A | Feb. 11, 2019 | - | View Document |
| 4 | Feb. 8, 2019 | 02062019ROGELSTAD | View Document |
| 4 | Feb. 8, 2019 | 02062019SMESTAD | View Document |
| 4 | Feb. 8, 2019 | 02062019KNUTSON | View Document |
| 4 | Feb. 8, 2019 | 02062019ABBOTT | View Document |
| 4 | Feb. 7, 2019 | 02062019MOUG | View Document |
| 4 | Feb. 7, 2019 | 02062019MACFARLANE | View Document |
| SC 13G/A | Feb. 6, 2019 | - | View Document |
| 4 | Nov. 20, 2018 | 112018ERICKSON | View Document |
| 4 | Nov. 13, 2018 | 111218KNUTSON | View Document |
| 10-Q | Nov. 9, 2018 | FORM 10-Q | View Document |
| 8-K | Nov. 6, 2018 | FORM 8-K | View Document |
| 10-Q | Aug. 9, 2018 | FORM 10-Q | View Document |
| SC 13G/A | Aug. 8, 2018 | - | View Document |
| 8-K | Aug. 7, 2018 | FORM 8-K | View Document |
| SD | May 31, 2018 | FORM SD | View Document |
| 4 | May 16, 2018 | 051518MOUG | View Document |
| 10-Q | May 9, 2018 | FORM 10-Q | View Document |
| 8-K | May 8, 2018 | FORM 8-K | View Document |
| S-3ASR | May 3, 2018 | S-3ASR | View Document |
| S-3ASR | May 3, 2018 | S-3ASR | View Document |
| 8-K | April 20, 2018 | FORM 8-K | View Document |
| 4 | April 13, 2018 | 042018MACFARLANE | View Document |
| 4 | April 13, 2018 | 042018KNUTSON | View Document |
| 4 | April 13, 2018 | 42018ROGELSTAD | View Document |
| 4 | April 10, 2018 | 040918STAKE | View Document |
| 8-K | April 10, 2018 | FORM 8-K | View Document |
| 4 | April 10, 2018 | 042018SMESTAD | View Document |
| 3 | April 10, 2018 | 042018WEBB | View Document |
| 4 | April 10, 2018 | 040918WEBB | View Document |
| 4 | April 10, 2018 | 040918PARTAIN | View Document |
| 4 | April 10, 2018 | 040918OKEEFE | View Document |
| 4 | April 10, 2018 | 040918JOHNSON | View Document |
| 4 | April 10, 2018 | 040918FRITZE | View Document |
| 4 | April 10, 2018 | 040918ERICKSON | View Document |
| 4 | April 10, 2018 | 040918BOHN | View Document |
| DEF 14A | Feb. 28, 2018 | DEFINITIVE PROXY STATEMENT | View Document |
| 10-K/A | Feb. 22, 2018 | FORM 10-K/A | View Document |
| 10-K | Feb. 20, 2018 | FORM 10-K | View Document |
| 4 | Feb. 16, 2018 | 02152018MOUG | View Document |
| 8-K | Feb. 13, 2018 | FORM 8-K | View Document |
| SC 13G/A | Feb. 9, 2018 | - | View Document |
| 4 | Feb. 8, 2018 | 02062018ROGELSTAD | View Document |
| 4 | Feb. 8, 2018 | 02062018ABBOTT | View Document |
| 4 | Feb. 8, 2018 | 02062018KNUTSON | View Document |
| 4 | Feb. 8, 2018 | 02062018MOUG | View Document |
| 4 | Feb. 8, 2018 | 02062018MACFARLANE | View Document |
| 4 | Feb. 7, 2018 | 02052018ABBOTT | View Document |
| 4 | Feb. 7, 2018 | 02052018KNUTSON | View Document |
| 4 | Feb. 7, 2018 | 02052018ROGELSTAD | View Document |
| 4 | Feb. 7, 2018 | 020518SMESTAD | View Document |
| 4 | Feb. 7, 2018 | 02052018MACFARLANE | View Document |
| 4 | Feb. 7, 2018 | 02052018MOUG | View Document |
| SC 13G/A | Jan. 29, 2018 | - | View Document |
| 3 | Jan. 2, 2018 | SMESTAD122917 | View Document |
| 8-K | Dec. 22, 2017 | FORM 8-K | View Document |
| 8-K | Dec. 19, 2017 | FORM 8-K | View Document |
| 4 | Nov. 20, 2017 | ERICKSON11202017 | View Document |
| 8-K | Nov. 16, 2017 | FORM 8-K | View Document |
| 4 | Nov. 15, 2017 | MOUG111517 | View Document |
| 4 | Nov. 15, 2017 | KOECK111517 | View Document |
| 10-Q | Nov. 8, 2017 | FORM 10-Q | View Document |
| 8-K | Nov. 2, 2017 | FORM 8-K | View Document |
| 8-K | Sept. 22, 2017 | FORM 8-K | View Document |
| 4 | Aug. 16, 2017 | 08162017MOUG | View Document |
| 10-Q | Aug. 9, 2017 | FORM 10-Q | View Document |
| 8-K | Aug. 8, 2017 | FORM 8-K | View Document |
| 8-K/A | June 21, 2017 | FORM 8-K/A | View Document |
| CT ORDER | June 9, 2017 | - | View Document |
| SD | May 31, 2017 | FORM SD | View Document |
| 4 | May 15, 2017 | MOUG05152017 | View Document |
| 10-K/A | May 15, 2017 | FORM 10-K/A (AMENDMENT NO. 1) | View Document |
| 10-Q | May 9, 2017 | FORM 10-Q | View Document |
| 8-K | May 2, 2017 | FORM 8-K | View Document |
| 4 | April 12, 2017 | 04102017FRITZE | View Document |
| 4 | April 12, 2017 | 04102017OKEEFE | View Document |
| 4 | April 12, 2017 | 04102017PARTAIN | View Document |
| 4 | April 12, 2017 | 04102017SCHUETTE | View Document |
| 4 | April 12, 2017 | 04102017STAKE | View Document |
| 4 | April 12, 2017 | 4102017BOHN | View Document |
| 4 | April 12, 2017 | 04102017ERICKSON | View Document |
| 4 | April 12, 2017 | 04102017JOHNSON | View Document |
| 4 | April 11, 2017 | 040817KNUTSON | View Document |
| 4 | April 11, 2017 | 04082017MACFARLANE | View Document |
| 4 | April 11, 2017 | 040817ROGELSTAD | View Document |
| 8-K | April 11, 2017 | FORM 8-K | View Document |
| 4 | March 13, 2017 | KOECK03132017 | View Document |
| DEF 14A | March 1, 2017 | DEFINITIVE PROXY STATEMENT | View Document |
| 10-K | Feb. 22, 2017 | FORM 10-K | View Document |
| 4 | Feb. 16, 2017 | MOUG021517 | View Document |
| SC 13G/A | Feb. 10, 2017 | - | View Document |
| 4 | Feb. 8, 2017 | MOUG02062017 | View Document |
| 4 | Feb. 8, 2017 | ROGELSTAD02062017 | View Document |
| 4 | Feb. 8, 2017 | ABBOTT02062017 | View Document |
| 8-K | Feb. 7, 2017 | FORM 8-K | View Document |
| 4 | Feb. 7, 2017 | KOECK02062017 | View Document |
| 4 | Feb. 7, 2017 | MACFARLANE002062017 | View Document |
| 4 | Feb. 7, 2017 | KNUTSON02062017 | View Document |
| 4 | Feb. 3, 2017 | FORM 4 | View Document |
| 4 | Feb. 3, 2017 | ROGELSTAD02022017 | View Document |
| 4 | Feb. 3, 2017 | MACFARLANE02022017 | View Document |
| 4 | Feb. 3, 2017 | KOECK02022017 | View Document |
| 4 | Feb. 3, 2017 | FORM 4 | View Document |
| 4 | Feb. 3, 2017 | MOUG02022017 | View Document |
| SC 13G/A | Jan. 25, 2017 | - | View Document |
| 4 | Jan. 9, 2017 | 01092017KNUTSON | View Document |
| 8-K | Dec. 15, 2016 | FORM 8-K | View Document |
| 4 | Nov. 21, 2016 | 112116ERICKSON | View Document |
| 8-K | Nov. 17, 2016 | FORM 8-K | View Document |
| 4 | Nov. 10, 2016 | MOUG111016 | View Document |
| 10-Q | Nov. 7, 2016 | FORM 10-Q | View Document |
| 8-K | Nov. 3, 2016 | FORM 8-K | View Document |
| 8-K | Sept. 27, 2016 | FORM 8-K | View Document |
| 4 | Aug. 16, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | Aug. 12, 2016 | FORM 4 SUBMISSION | View Document |
| 10-Q | Aug. 9, 2016 | FORM 10-Q | View Document |
| 8-K | Aug. 9, 2016 | FORM 8-K | View Document |
| SD | May 31, 2016 | FORM SD | View Document |
| 10-Q | May 9, 2016 | FORM 10-Q | View Document |
| 8-K | May 3, 2016 | FORM 8-K | View Document |
| 4 | April 12, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2016 | FORM 4 SUBMISSION | View Document |
| 8-K | April 12, 2016 | FORM 8-K | View Document |
| 4 | April 12, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | April 11, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | April 11, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | April 11, 2016 | FORM 4 SUBMISSION | View Document |
| DEF 14A | March 1, 2016 | DEF 14A | View Document |
| 10-K | Feb. 29, 2016 | FORM 10-K | View Document |
| 8-K | Feb. 16, 2016 | FORM 8-K | View Document |
| SC 13G/A | Feb. 11, 2016 | - | View Document |
| 4 | Feb. 10, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2016 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2016 | FORM 4 SUBMISSION | View Document |
| 8-K | Feb. 9, 2016 | FORM 8-K | View Document |
| SC 13G/A | Jan. 27, 2016 | - | View Document |
| 10-Q | Nov. 9, 2015 | FORM 10-Q | View Document |
| 8-K | Nov. 3, 2015 | FORM 8-K | View Document |
| POSASR | Oct. 13, 2015 | POSASR | View Document |
| CT ORDER | Sept. 18, 2015 | - | View Document |
| 4 | Aug. 18, 2015 | FORM 4 SUBMISSION | View Document |
| 10-Q | Aug. 10, 2015 | FORM 10-Q | View Document |
| 8-K | Aug. 4, 2015 | FORM 8-K | View Document |
| 4 | July 2, 2015 | FORM 4 SUBMISSION | View Document |
| 8-K | June 15, 2015 | FORM 8-K | View Document |
| SD | June 1, 2015 | FORM SD | View Document |
| S-8 | May 11, 2015 | FORM S-8 | View Document |
| S-3ASR | May 11, 2015 | S-3ASR | View Document |
| 10-Q | May 11, 2015 | FROM 10-Q | View Document |
| 8-K | May 11, 2015 | FORM 8-K | View Document |
| 424B5 | May 11, 2015 | PROSPECTUS SUPPLEMENT | View Document |
| S-3ASR | May 11, 2015 | FORM S-3ASR | View Document |
| 8-K | May 5, 2015 | FORM 8-K | View Document |
| 8-K | April 15, 2015 | FORM 8-K | View Document |
| 4 | April 15, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 15, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 15, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 15, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 14, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 14, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 14, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 14, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 14, 2015 | FORM 4 SUBMISSION | View Document |
| 3 | April 13, 2015 | FORM 3 SUBMISSION | View Document |
| 4 | April 10, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | March 25, 2015 | FORM 4 SUBMISSION | View Document |
| 8-K | March 18, 2015 | FORM 8-K | View Document |
| ARS | March 16, 2015 | AUTO-GENERATED PAPER DOCUMENT | View Document |
| DEF 14A | March 3, 2015 | DEFINITIVE PROXY STATEMENT | View Document |
| 10-K | March 2, 2015 | FORM 10-K | View Document |
| SC 13G/A | Feb. 20, 2015 | - | View Document |
| 4 | Feb. 12, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 12, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 12, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 12, 2015 | FORM 4 SUBMISSION | View Document |
| 8-K | Feb. 11, 2015 | FORM 8-K | View Document |
| 4 | Feb. 10, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2015 | FORM 4 SUBMISSION | View Document |
| 8-K | Feb. 10, 2015 | FORM 8-K | View Document |
| 4 | Feb. 10, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 9, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 9, 2015 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 9, 2015 | FORM 4 SUBMISSION | View Document |
| SC 13G | Feb. 3, 2015 | - | View Document |
| 4 | Dec. 12, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | Dec. 12, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | Nov. 19, 2014 | FORM 4 SUBMISSION | View Document |
| 10-Q | Nov. 10, 2014 | FORM 10-Q | View Document |
| 8-K | Nov. 4, 2014 | FORM 8-K | View Document |
| 8-K | Sept. 26, 2014 | FORM 8-K | View Document |
| 4 | Aug. 22, 2014 | FORM 4 SUBMISSION | View Document |
| 10-Q | Aug. 11, 2014 | FORM 10-Q | View Document |
| 8-K | Aug. 5, 2014 | FORM 8-K | View Document |
| S-8 POS | July 25, 2014 | POST-EFFECTIVE AMENDMENT NO. 2 TO FORM S-8 | View Document |
| S-8 POS | July 25, 2014 | POST-EFFECTIVE AMENDMENT NO. 2 TO FORM S-8 | View Document |
| S-8 POS | July 25, 2014 | POST-EFFECTIVE AMENDMENT NO. 2 TO FORM S-8 | View Document |
| 4 | July 1, 2014 | FORM 4 SUBMISSION | View Document |
| SD | June 2, 2014 | FORM SD | View Document |
| 8-K | May 14, 2014 | 8-K | View Document |
| 424B5 | May 14, 2014 | PROSPECTUS SUPPLEMENT | View Document |
| 10-Q | May 12, 2014 | FORM 10-Q | View Document |
| 8-K | May 6, 2014 | FORM 8-K | View Document |
| 8-K | April 17, 2014 | FORM 8-K | View Document |
| S-8 | April 17, 2014 | FORM S-8 | View Document |
| 3 | April 17, 2014 | FORM 3 SUBMISSION | View Document |
| 4 | April 16, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 16, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 16, 2014 | FORM 4 SUBMISSION | View Document |
| 3 | April 16, 2014 | FORM 3 SUBMISSION | View Document |
| 4 | April 16, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 16, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 16, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 16, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 15, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 15, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 15, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 15, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 15, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 15, 2014 | FORM 4 SUBMISSION | View Document |
| 8-K | April 14, 2014 | FORM 8-K | View Document |
| 4 | April 10, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | April 2, 2014 | FORM 4 SUBMISSION | View Document |
| DEFA14A | March 31, 2014 | DEFINITIVE ADDITIONAL MATERIALS | View Document |
| ARS | March 18, 2014 | AUTO-GENERATED PAPER DOCUMENT | View Document |
| ARS | March 18, 2014 | AUTO-GENERATED PAPER DOCUMENT | View Document |
| 4 | March 14, 2014 | FORM 4 SUBMISSION | View Document |
| 8-K | March 5, 2014 | FORM 8-K | View Document |
| DEF 14A | March 3, 2014 | DEFINITIVE NOTICE AND PROXY STATEMENT | View Document |
| 10-K | March 3, 2014 | FORM 10-K | View Document |
| 4 | Feb. 24, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 21, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 13, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 13, 2014 | FORM 4 SUBMISSION | View Document |
| 8-K | Feb. 11, 2014 | FORM 8-K | View Document |
| 4 | Feb. 7, 2014 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 7, 2014 | FORM 4 SUBMISSION | View Document |
| 8-K | Jan. 31, 2014 | FORM 8-K | View Document |
| UPLOAD | Jan. 29, 2014 | - | View Document |
| CORRESP | Jan. 24, 2014 | - | View Document |
| UPLOAD | Jan. 14, 2014 | - | View Document |
| 4 | Jan. 3, 2014 | FORM 4 SUBMISSION | View Document |
| CORRESP | Dec. 26, 2013 | - | View Document |
| UPLOAD | Dec. 12, 2013 | - | View Document |
| 8-K | Dec. 2, 2013 | FORM 8-K | View Document |
| 4 | Nov. 26, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | Nov. 15, 2013 | FORM 4 SUBMISSION | View Document |
| 10-Q | Nov. 12, 2013 | FORM 10-Q | View Document |
| 8-K | Nov. 5, 2013 | FORM 8-K | View Document |
| 8-K | Nov. 1, 2013 | FORM 8-K | View Document |
| CT ORDER | Oct. 7, 2013 | - | View Document |
| 4 | Oct. 2, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | Oct. 1, 2013 | FORM 4 SUBMISSION | View Document |
| 10-Q/A | Sept. 27, 2013 | FORM 10-Q (AMENDMENT NO. 1) | View Document |
| 3 | Aug. 16, 2013 | FORM 3 SUBMISSION | View Document |
| 8-K | Aug. 16, 2013 | OTTER TAIL CORPORATION 8-K | View Document |
| 8-K | Aug. 15, 2013 | OTTER TAIL CORPORATION 8-K | View Document |
| 10-Q | Aug. 9, 2013 | FORM 10-Q | View Document |
| 8-K | Aug. 6, 2013 | OTTER TAIL CORP. 8-K | View Document |
| 4 | June 28, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | June 28, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | June 13, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | June 10, 2013 | FORM 4 SUBMISSION | View Document |
| CT ORDER | June 3, 2013 | - | View Document |
| 4 | May 21, 2013 | FORM 4 SUBMISSION | View Document |
| 8-K | May 20, 2013 | OTTER TAIL CORPORATION 8-K | View Document |
| 4 | May 14, 2013 | FORM 4 SUBMISSION | View Document |
| 10-Q | May 10, 2013 | FORM 10-Q | View Document |
| 8-K | May 7, 2013 | OTTER TAIL CORP. 8-K | View Document |
| 3 | April 11, 2013 | FORM 3 SUBMISSION | View Document |
| 4 | April 11, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2013 | FORM 4 SUBMISSION | View Document |
| 8-K | April 10, 2013 | OTTER TAIL CORPORATION 8-K | View Document |
| 4 | April 10, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 2, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | April 2, 2013 | FORM 4 SUBMISSION | View Document |
| CT ORDER | March 22, 2013 | - | View Document |
| ARS | March 15, 2013 | AUTO-GENERATED PAPER DOCUMENT | View Document |
| 15-12G | March 12, 2013 | FORM 15-12G | View Document |
| 8-K | March 7, 2013 | OTTER TAIL CORPORATION 8-K | View Document |
| DEF 14A | Feb. 27, 2013 | PROXY STATEMENT | View Document |
| 10-K | Feb. 27, 2013 | FORM 10-K | View Document |
| 8-K | Feb. 22, 2013 | OTTER TAIL CORPORATION 8K | View Document |
| 8-K | Feb. 12, 2013 | OTTER TAIL CORPORATION 8-K | View Document |
| UPLOAD | Jan. 28, 2013 | - | View Document |
| CORRESP | Jan. 23, 2013 | - | View Document |
| 4 | Jan. 3, 2013 | FORM 4 SUBMISSION | View Document |
| 4 | Jan. 3, 2013 | FORM 4 SUBMISSION | View Document |
| UPLOAD | Dec. 31, 2012 | - | View Document |
| 4 | Dec. 10, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | Nov. 27, 2012 | FORM 4 SUBMISSION | View Document |
| 10-Q | Nov. 9, 2012 | FORM 10-Q | View Document |
| 8-K | Nov. 6, 2012 | OTTER TAIL CORPORATION 8-K | View Document |
| 8-K | Nov. 2, 2012 | OTTER TAIL CORPORATION 8-K | View Document |
| 8-K | Oct. 15, 2012 | OTTER TAIL CORPORATION 8-K | View Document |
| 3 | Oct. 3, 2012 | FORM 3 SUBMISSION | View Document |
| 4 | Oct. 1, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | Oct. 1, 2012 | FORM 4 SUBMISSION | View Document |
| 10-Q | Aug. 9, 2012 | FORM 10-Q | View Document |
| 8-K | Aug. 7, 2012 | OTTER TAIL CORPORATION 8-K | View Document |
| SC 13D/A | July 16, 2012 | SC 13D/A | View Document |
| 8-K | July 16, 2012 | OTTER TAIL CORPORATION 8-K | View Document |
| 4 | July 3, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | July 3, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | June 11, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | May 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | May 15, 2012 | FORM 4 SUBMISSION | View Document |
| 424B5 | May 14, 2012 | PROSPECTUS SUPPLEMENT | View Document |
| 8-K | May 14, 2012 | FORM 8-K | View Document |
| S-8 | May 11, 2012 | FORM S-8 | View Document |
| S-3ASR | May 11, 2012 | FORM S-3 ASR | View Document |
| S-3ASR | May 11, 2012 | FORM S-3 ASR | View Document |
| 10-Q | May 10, 2012 | OTTER TAIL CORPORATION 10-Q | View Document |
| 8-K | May 8, 2012 | OTTER TAIL CORP. 8-K | View Document |
| 8-K | April 19, 2012 | OTTER TAIL CORPORATION 8-K | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 17, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 10, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 3, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | April 3, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | March 27, 2012 | FORM 4 SUBMISSION | View Document |
| 8-K | March 20, 2012 | OTTER TAIL CORPORATION 8K | View Document |
| ARS | March 19, 2012 | AUTO-GENERATED PAPER DOCUMENT | View Document |
| DEF 14A | March 7, 2012 | NOA & PROXY STATEMENT | View Document |
| 10-K | Feb. 29, 2012 | OTTER TAIL CORPORATION 10-K | View Document |
| 4 | Feb. 17, 2012 | FORM 4 SUBMISSION | View Document |
| 8-K | Feb. 7, 2012 | OTTER TAIL CORP. 8-K | View Document |
| 8-K | Jan. 9, 2012 | FORM 8-K | View Document |
| SC 13D/A | Jan. 9, 2012 | SC 13D/A | View Document |
| 8-K | Jan. 6, 2012 | FORM 8-K | View Document |
| 4 | Jan. 4, 2012 | FORM 4 SUBMISSION | View Document |
| 4 | Jan. 4, 2012 | FORM 4 SUBMISSION | View Document |
| 3 | Jan. 3, 2012 | FORM 3 SUBMISSION | View Document |
| 8-K | Dec. 30, 2011 | OTTER TAIL CORPORATION 8-K | View Document |
| 4 | Dec. 27, 2011 | FORM 4 SUBMISSION | View Document |
| 8-K | Dec. 20, 2011 | OTTER TAIL CORPORATION 8-K | View Document |
| 4 | Dec. 19, 2011 | FORM 4 SUBMISSION | View Document |
| SC 13D/A | Dec. 13, 2011 | SC 13D/A | View Document |
| 8-K | Dec. 13, 2011 | FORM 8-K | View Document |
| 8-K | Dec. 6, 2011 | FORM 8-K | View Document |
| 4 | Nov. 14, 2011 | FORM 4 SUBMISSION | View Document |
| 10-Q | Nov. 9, 2011 | OTTER TAIL CORPORATION 10-Q | View Document |
| 8-K | Nov. 4, 2011 | OTTER TAIL CORP. 8-K | View Document |
| SC 13D/A | Nov. 4, 2011 | SC 13D/A | View Document |
| 4 | Oct. 4, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | Oct. 4, 2011 | FORM 4 SUBMISSION | View Document |
| 8-K | Sept. 9, 2011 | FORM 8-K | View Document |
| 4 | Aug. 24, 2011 | FORM 4 SUBMISSION | View Document |
| 8-K | Aug. 9, 2011 | OTTER TAIL CORP. 8-K | View Document |
| 10-Q | Aug. 9, 2011 | OTTER TAIL CORPORATION 10-Q | View Document |
| 8-K | Aug. 3, 2011 | OTTER TAIL CORPORATION 8-K | View Document |
| 4 | July 5, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | July 5, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | May 17, 2011 | FORM 4 SUBMISSION | View Document |
| 10-Q | May 10, 2011 | OTTER TAIL CORPORATION 10-Q | View Document |
| 8-K | May 10, 2011 | OTTER TAIL CORPORATION 8-K | View Document |
| 8-K | April 15, 2011 | OTTER TAIL CORPORATION 8-K | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 3 | April 12, 2011 | FORM 3 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 4, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | April 4, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | March 10, 2011 | FORM 4 SUBMISSION | View Document |
| 8-K | March 8, 2011 | OTTER TAIL CORPORATION 8-K | View Document |
| DEF 14A | March 2, 2011 | DEF 14A | View Document |
| 10-K | Feb. 28, 2011 | OTTER TAIL CORP. 10-K | View Document |
| 4 | Feb. 15, 2011 | FORM 4 SUBMISSION | View Document |
| 8-K | Feb. 8, 2011 | OTTER TAIL CORPORATION 8-K | View Document |
| 4 | Feb. 4, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | Jan. 7, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | Jan. 4, 2011 | FORM 4 SUBMISSION | View Document |
| 4 | Dec. 30, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Dec. 15, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Nov. 19, 2010 | FORM 4 SUBMISSION | View Document |
| 10-Q | Nov. 8, 2010 | OTTER TAIL CORPORATION 10-Q | View Document |
| 8-K | Oct. 29, 2010 | OTTER TAIL CORPORATION 8-K | View Document |
| UPLOAD | Oct. 29, 2010 | - | View Document |
| CORRESP | Oct. 25, 2010 | - | View Document |
| UPLOAD | Oct. 13, 2010 | - | View Document |
| 8-K | Oct. 4, 2010 | FORM 8-K | View Document |
| 4 | Oct. 4, 2010 | FORM 4 SUBMISSION | View Document |
| CORRESP | Sept. 29, 2010 | - | View Document |
| UPLOAD | Sept. 16, 2010 | - | View Document |
| 4 | Aug. 25, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Aug. 18, 2010 | FORM 4 SUBMISSION | View Document |
| 10-Q | Aug. 9, 2010 | OTTER TAIL CORPORATION 10-Q | View Document |
| 8-K | Aug. 3, 2010 | FORM 8-K | View Document |
| SC 13D/A | Aug. 3, 2010 | SC 13D/A | View Document |
| 4 | July 1, 2010 | FORM 4 SUBMISSION | View Document |
| 8-K | June 29, 2010 | FORM 8-K | View Document |
| SC 13D/A | June 29, 2010 | SC 13D/A | View Document |
| 8-K | May 10, 2010 | FORM 8-K | View Document |
| 10-Q | May 7, 2010 | FORM 10-Q | View Document |
| 8-K | May 4, 2010 | OTTER TAIL CORP. 8-K | View Document |
| 8-K | April 14, 2010 | FORM 8-K | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 3 | April 13, 2010 | FORM 3 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 13, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 12, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 9, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 7, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | April 7, 2010 | FORM 4 SUBMISSION | View Document |
| 8-K | April 5, 2010 | FORM 8-K | View Document |
| 4 | April 2, 2010 | FORM 4 SUBMISSION | View Document |
| 424B5 | March 17, 2010 | FORM 424B5 | View Document |
| 8-K | March 17, 2010 | FORM 8-K | View Document |
| ARS | March 15, 2010 | AUTO-GENERATED PAPER DOCUMENT | View Document |
| 4 | March 12, 2010 | FORM 4 SUBMISSION | View Document |
| DEF 14A | March 5, 2010 | DEF 14A | View Document |
| 4 | March 1, 2010 | FORM 4 SUBMISSION | View Document |
| 10-K | Feb. 26, 2010 | FORM 10-K | View Document |
| 4 | Feb. 19, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 16, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 16, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 16, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 16, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Feb. 10, 2010 | FORM 4 SUBMISSION | View Document |
| 8-K | Feb. 9, 2010 | FORM 8-K | View Document |
| 4 | Jan. 5, 2010 | FORM 4 SUBMISSION | View Document |
| 4 | Dec. 23, 2009 | FORM 4 SUBMISSION | View Document |
| 4 | Dec. 17, 2009 | FORM 4 SUBMISSION | View Document |
| 4 | Dec. 17, 2009 | FORM 4 SUBMISSION | View Document |
| 4 | Dec. 8, 2009 | FORM 4 SUBMISSION | View Document |
| 8-K | Dec. 4, 2009 | FORM 8-K | View Document |
| 424B2 | Dec. 2, 2009 | 424B2 | View Document |
| FWP | Dec. 1, 2009 | FORM FWP | View Document |
| 424B5 | Nov. 30, 2009 | 424B5 | View Document |
| 4 | Nov. 30, 2009 | FORM 4 SUBMISSION | View Document |
| 4 | Nov. 17, 2009 | FORM 4 SUBMISSION | View Document |
| 10-Q | Nov. 9, 2009 | FORM 10-Q | View Document |
| 8-K | Oct. 30, 2009 | FORM 8-K | View Document |
| SC 13D/A | Oct. 7, 2009 | SC 13D/A | View Document |
| 4 | Oct. 2, 2009 | FORM 4 SUBMISSION | View Document |
| 8-K | Sept. 16, 2009 | 8-K | View Document |
| 8-K | Sept. 11, 2009 | FORM 8-K | View Document |
| S-8 POS | Aug. 28, 2009 | S-8 POS | View Document |
| 4 | Aug. 27, 2009 | FORM 4 SUBMISSION | View Document |
| 10-Q | Aug. 7, 2009 | FORM 10-Q | View Document |
| 8-K | Aug. 4, 2009 | FORM 8-K | View Document |
| SC 13D/A | July 2, 2009 | SC 13D/A | View Document |
| 4 | July 2, 2009 | FORM 4 SUBMISSION | View Document |
| POSASR | July 1, 2009 | POSASR | View Document |
| S-8 POS | July 1, 2009 | S-8 POS | View Document |
| S-8 POS | July 1, 2009 | S-8 POS | View Document |
| S-8 POS | July 1, 2009 | S-8 POS | View Document |
| S-8 POS | July 1, 2009 | S-8 POS | View Document |
| 8-K12G3 | July 1, 2009 | FORM 8-K12G3 | View Document |
| POSASR | July 1, 2009 | POSASR | View Document |