{"filing":{"accession_number":"0000755001-26-000019","cik":"0000755001","ticker":"UTL","company_name":"UNITIL CORP","form":"8-K","filing_date":"2026-05-27","report_date":null,"primary_document":"utl-20260525.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/755001/000075500126000019/utl-20260525.htm"},"events":[{"id":8633,"run_id":7581,"accession_number":"0000755001-26-000019","anchor_item_number":"1.01","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"summary":"This disclosure concerns Amendment No. 3 to a material acquisition agreement under which Unitil Corporation agreed to acquire all issued and outstanding shares of three water companies (Aquarion Water Company of Massachusetts, Inc., Aquarion Water Company of New Hampshire, Inc., and Abenaki Water Co., Inc.) from Aquarion Water Authority. The amendment extends the termination date from May 25, 2026 to June 30, 2026, representing a modification to an ongoing material acquisition transaction. Item 1.01 explicitly covers entry into material definitive agreements and amendments thereto related to acquisitions.","company_name":"UNITIL CORP","ticker":"UTL","filing_date":"2026-05-27","form":"8-K","submitted_at":null,"items":[{"id":1759,"accession_number":"0000755001-26-000019","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"reasoning":"This disclosure concerns Amendment No. 3 to a material acquisition agreement under which Unitil Corporation agreed to acquire all issued and outstanding shares of three water companies (Aquarion Water Company of Massachusetts, Inc., Aquarion Water Company of New Hampshire, Inc., and Abenaki Water Co., Inc.) from Aquarion Water Authority. The amendment extends the termination date from May 25, 2026 to June 30, 2026, representing a modification to an ongoing material acquisition transaction. Item 1.01 explicitly covers entry into material definitive agreements and amendments thereto related to acquisitions.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-28T02:06:56.063048+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":1759,"accession_number":"0000755001-26-000019","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"reasoning":"This disclosure concerns Amendment No. 3 to a material acquisition agreement under which Unitil Corporation agreed to acquire all issued and outstanding shares of three water companies (Aquarion Water Company of Massachusetts, Inc., Aquarion Water Company of New Hampshire, Inc., and Abenaki Water Co., Inc.) from Aquarion Water Authority. The amendment extends the termination date from May 25, 2026 to June 30, 2026, representing a modification to an ongoing material acquisition transaction. Item 1.01 explicitly covers entry into material definitive agreements and amendments thereto related to acquisitions.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-05-28T02:06:56.063048+00:00","company_name":"UNITIL CORP","ticker":"UTL","filing_date":"2026-05-27"}]}