{"filing":{"accession_number":"0001723596-26-000031","cik":"0001723596","ticker":"CLBK","company_name":"Columbia Financial, Inc.","form":"8-K","filing_date":"2026-07-02","report_date":null,"primary_document":"clbk-20260701.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1723596/000172359626000031/clbk-20260701.htm"},"events":[{"id":15698,"run_id":13997,"accession_number":"0001723596-26-000031","anchor_item_number":"8.01","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"summary":"The disclosure announces stockholder and depositor approval of two material transactions: (1) Columbia Bank MHC's conversion from mutual holding company to fully public stock holding company form (the \"Conversion\"), and (2) Columbia Financial's simultaneous acquisition of Northfield Bancorp, Inc. The press release explicitly states these are \"pending\" transactions approved at stockholder and member meetings on June 25 and June 29, 2026, with completion subject to regulatory approvals and minimum share sales. This constitutes material M\u0026A activity under Items 1.01/2.01 of the 8-K taxonomy, as the acquisition of Northfield and the structural reorganization represent significant changes of control and business combination events.","company_name":"Columbia Financial, Inc.","ticker":"CLBK","filing_date":"2026-07-02","form":"8-K","submitted_at":null,"items":[{"id":13572,"accession_number":"0001723596-26-000031","item_number":"8.01","item_title":"Other Events","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"reasoning":"The disclosure announces stockholder and depositor approval of two material transactions: (1) Columbia Bank MHC's conversion from mutual holding company to fully public stock holding company form (the \"Conversion\"), and (2) Columbia Financial's simultaneous acquisition of Northfield Bancorp, Inc. The press release explicitly states these are \"pending\" transactions approved at stockholder and member meetings on June 25 and June 29, 2026, with completion subject to regulatory approvals and minimum share sales. This constitutes material M\u0026A activity under Items 1.01/2.01 of the 8-K taxonomy, as the acquisition of Northfield and the structural reorganization represent significant changes of control and business combination events.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-07-02T12:30:52.030266+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":13572,"accession_number":"0001723596-26-000031","item_number":"8.01","item_title":"Other Events","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"reasoning":"The disclosure announces stockholder and depositor approval of two material transactions: (1) Columbia Bank MHC's conversion from mutual holding company to fully public stock holding company form (the \"Conversion\"), and (2) Columbia Financial's simultaneous acquisition of Northfield Bancorp, Inc. The press release explicitly states these are \"pending\" transactions approved at stockholder and member meetings on June 25 and June 29, 2026, with completion subject to regulatory approvals and minimum share sales. This constitutes material M\u0026A activity under Items 1.01/2.01 of the 8-K taxonomy, as the acquisition of Northfield and the structural reorganization represent significant changes of control and business combination events.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-07-02T12:30:52.030266+00:00","company_name":"Columbia Financial, Inc.","ticker":"CLBK","filing_date":"2026-07-02"}]}