# Filing Detail

Form 8-K - Current report:
SEC Accession No. 0001466593-26-000037
Filing Date
2026-04-14
Accepted
2026-04-14 14:32:40
Documents
15
Period of Report
2026-04-13
Items
Item 5.02: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
Item 7.01: Regulation FD Disclosure
Item 9.01: Financial Statements and Exhibits

Document Format Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
1 | 8-K | ottr-20260413.htm iXBRL | 8-K | 29306
2 | EX-99.1 | ex991-pressreleasex2026new.htm | EX-99.1 | 9260
6 | GRAPHIC | timrogelstada.jpg | GRAPHIC | 1630136
7 | GRAPHIC | toddwahlunda.jpg | GRAPHIC | 1224980
8 | GRAPHIC | tylernelsona.jpg | GRAPHIC | 1714441
| Complete submission text file | 0001466593-26-000037.txt |  | 6451189

Data Files

Seq | Description | Document | Type | Size
--- | --- | --- | --- | ---
3 | XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT | ottr-20260413.xsd | EX-101.SCH | 1788
4 | XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT | ottr-20260413_lab.xml | EX-101.LAB | 21629
5 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT | ottr-20260413_pre.xml | EX-101.PRE | 12512
18 | EXTRACTED XBRL INSTANCE DOCUMENT | ottr-20260413_htm.xml | XML | 2746

Mailing Address 215 S CASCADE ST PO BOX 496 FERGUS FALLS MN 56538-0496
Business Address 215 S CASCADE ST PO BOX 496 FERGUS FALLS MN 56538-0496 866-410-8780
Otter Tail Corp (Filer) CIK: 0001466593 (see all company filings)

EIN.: 270383995 | State of Incorp.: MN | Fiscal Year End: 1231
Type: 8-K | Act: 34 | File No.: 000-53713 | Film No.: 26860422
SIC: 4911 Electric Services
(CF Office: 01 Energy & Transportation)