{"filing":{"accession_number":"0000755001-26-000033","cik":"0000755001","ticker":"UTL","company_name":"UNITIL CORP","form":"8-K","filing_date":"2026-10-19","report_date":"2026-10-14","primary_document":"utl-20261014.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/755001/000075500126000033/utl-20261014.htm"},"events":[{"id":36114,"run_id":33296,"accession_number":"0000755001-26-000033","anchor_item_number":"1.01","event_type":"debt_issuance","event_domain":"financial","is_material":true,"confidence":0.92,"summary":"Unitil Energy Systems, Inc. entered into a Bond Purchase Agreement and Eighteenth Supplemental Indenture on October 14, 2026, issuing $60 million in new long-term First Mortgage Bonds: $30 million of 5.72% Series T (due 2036) and $30 million of 5.87% Series U (due 2038). Proceeds will be used for refinancing existing debt and general corporate purposes.","company_name":"UNITIL CORP","ticker":"UTL","filing_date":"2026-10-19","form":"8-K","submitted_at":null,"items":[{"id":40405,"accession_number":"0000755001-26-000033","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"debt_issuance","event_domain":"financial","is_material":true,"confidence":0.95,"reasoning":"Unitil Energy Systems, Inc. entered into a Bond Purchase Agreement and Eighteenth Supplemental Indenture on October 14, 2026, issuing $30 million of 5.72% First Mortgage Bonds Series T (due 2036) and $30 million of 5.87% First Mortgage Bonds Series U (due 2038), totaling $60 million in new long-term debt. This is a material creation of direct financial obligations disclosed under Item 1.01, with proceeds to be used for refinancing existing debt and general corporate purposes.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-19T20:31:56.312374+00:00","company_name":"","ticker":null,"filing_date":""},{"id":40406,"accession_number":"0000755001-26-000033","item_number":"2.03","item_title":"Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.","event_type":"debt_issuance","event_domain":"financial","is_material":true,"confidence":0.85,"reasoning":"Item 2.03 addresses creation of a direct financial obligation, which is the standard disclosure vehicle for debt issuances. The incorporation by reference to Item 1.01 (Business Combinations) suggests this may involve debt incurred in connection with an acquisition or material transaction. Debt issuances are material to investors as they affect the registrant's capital structure and financial obligations.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-19T20:31:56.312374+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":40405,"accession_number":"0000755001-26-000033","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"debt_issuance","event_domain":"financial","is_material":true,"confidence":0.95,"reasoning":"Unitil Energy Systems, Inc. entered into a Bond Purchase Agreement and Eighteenth Supplemental Indenture on October 14, 2026, issuing $30 million of 5.72% First Mortgage Bonds Series T (due 2036) and $30 million of 5.87% First Mortgage Bonds Series U (due 2038), totaling $60 million in new long-term debt. This is a material creation of direct financial obligations disclosed under Item 1.01, with proceeds to be used for refinancing existing debt and general corporate purposes.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-19T20:31:56.312374+00:00","company_name":"UNITIL CORP","ticker":"UTL","filing_date":"2026-10-19"},{"id":40406,"accession_number":"0000755001-26-000033","item_number":"2.03","item_title":"Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.","event_type":"debt_issuance","event_domain":"financial","is_material":true,"confidence":0.85,"reasoning":"Item 2.03 addresses creation of a direct financial obligation, which is the standard disclosure vehicle for debt issuances. The incorporation by reference to Item 1.01 (Business Combinations) suggests this may involve debt incurred in connection with an acquisition or material transaction. Debt issuances are material to investors as they affect the registrant's capital structure and financial obligations.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-19T20:31:56.312374+00:00","company_name":"UNITIL CORP","ticker":"UTL","filing_date":"2026-10-19"}]}