{"filing":{"accession_number":"0001466593-26-000063","cik":"0001466593","ticker":"OTTR","company_name":"Otter Tail Corp","form":"8-K","filing_date":"2026-06-18","report_date":null,"primary_document":"ottr-20260617.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1466593/000146659326000063/ottr-20260617.htm"},"events":[{"id":11711,"run_id":10294,"accession_number":"0001466593-26-000063","anchor_item_number":"1.01","event_type":"material_litigation","event_domain":"legal","is_material":true,"confidence":0.95,"summary":"The filing discloses a material settlement agreement resolving antitrust class action litigation (In re: PVC Pipe Antitrust Litigation) for $30 million. Although Item 1.01 is cited, the substance is a material litigation settlement that materially affects the company's financial position and reduces significant legal exposure and uncertainty. The $30 million settlement payment and resolution of End-User class claims constitute a material event requiring disclosure under 8-K Item 8.01 (Other Events) or as a material settlement, which falls under material_litigation in this taxonomy.","company_name":"Otter Tail Corp","ticker":"OTTR","filing_date":"2026-06-18","form":"8-K","submitted_at":null,"items":[{"id":8367,"accession_number":"0001466593-26-000063","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"material_litigation","event_domain":"legal","is_material":true,"confidence":0.95,"reasoning":"The filing discloses a material settlement agreement resolving antitrust class action litigation (In re: PVC Pipe Antitrust Litigation) for $30 million. Although Item 1.01 is cited, the substance is a material litigation settlement that materially affects the company's financial position and reduces significant legal exposure and uncertainty. The $30 million settlement payment and resolution of End-User class claims constitute a material event requiring disclosure under 8-K Item 8.01 (Other Events) or as a material settlement, which falls under material_litigation in this taxonomy.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-18T12:03:15.773295+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":8367,"accession_number":"0001466593-26-000063","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"material_litigation","event_domain":"legal","is_material":true,"confidence":0.95,"reasoning":"The filing discloses a material settlement agreement resolving antitrust class action litigation (In re: PVC Pipe Antitrust Litigation) for $30 million. Although Item 1.01 is cited, the substance is a material litigation settlement that materially affects the company's financial position and reduces significant legal exposure and uncertainty. The $30 million settlement payment and resolution of End-User class claims constitute a material event requiring disclosure under 8-K Item 8.01 (Other Events) or as a material settlement, which falls under material_litigation in this taxonomy.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-18T12:03:15.773295+00:00","company_name":"Otter Tail Corp","ticker":"OTTR","filing_date":"2026-06-18"}]}