{"filing":{"accession_number":"0001466593-26-000074","cik":"0001466593","ticker":"OTTR","company_name":"Otter Tail Corp","form":"8-K","filing_date":"2026-09-01","report_date":"2026-08-28","primary_document":"ottr-20260828.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1466593/000146659326000074/ottr-20260828.htm"},"events":[{"id":30852,"run_id":28291,"accession_number":"0001466593-26-000074","anchor_item_number":"5.02","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"summary":"Two directors—Thomas J. Webb and Kathryn O. Johnson—have notified the Company of their intention to retire from the Board of Directors effective at the 2027 Annual Meeting. Although the departures are orderly retirements in accordance with the director retirement policy and unrelated to any disagreement, the disclosure centers on the principal action of directors leaving their roles, which is the hallmark of exec_departure. Board composition changes are material to investors assessing governance and continuity.","company_name":"Otter Tail Corp","ticker":"OTTR","filing_date":"2026-09-01","form":"8-K","submitted_at":null,"items":[{"id":33581,"accession_number":"0001466593-26-000074","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"Two directors—Thomas J. Webb and Kathryn O. Johnson—have notified the Company of their intention to retire from the Board of Directors effective at the 2027 Annual Meeting. Although the departures are orderly retirements in accordance with the director retirement policy and unrelated to any disagreement, the disclosure centers on the principal action of directors leaving their roles, which is the hallmark of exec_departure. Board composition changes are material to investors assessing governance and continuity.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-09-01T13:59:43.863921+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":33581,"accession_number":"0001466593-26-000074","item_number":"5.02","item_title":"Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"Two directors—Thomas J. Webb and Kathryn O. Johnson—have notified the Company of their intention to retire from the Board of Directors effective at the 2027 Annual Meeting. Although the departures are orderly retirements in accordance with the director retirement policy and unrelated to any disagreement, the disclosure centers on the principal action of directors leaving their roles, which is the hallmark of exec_departure. Board composition changes are material to investors assessing governance and continuity.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-09-01T13:59:43.863921+00:00","company_name":"Otter Tail Corp","ticker":"OTTR","filing_date":"2026-09-01"}]}