{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-23-005000","form_type":"8-K","ticker":"COLB","cik":"0000887343","company_name":"COLUMBIA BANKING SYSTEM, INC.","filed_at":"2023-01-10T23:59:59+00:00","discovered_at":"2026-05-14T18:03:48.411813+00:00","generated_at":"2026-06-20T17:22:11.014721+00:00","sec_items":["1.01","8.01","9.01"],"event_type":"m_and_a","sentiment":"positive","materiality_score":0.7,"calibrated_materiality_score":0.7,"confidence":"high","headline":"Columbia-Umpqua merger gets FDIC approval; closing by end of Feb 2023","bullets":["FDIC approved bank merger of Columbia State Bank into Umpqua Bank, final regulatory approval.","Merger expected to close by end of February; outside date extended to March 11, 2023.","Combined company to have >$50B assets, operate in eight western states, trade under COLB.","Branch divestitures of 10 branches required as condition; previously announced."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-23-005000","json":"https://secwatch.observer/filing/0001193125-23-005000.json","markdown":"https://secwatch.observer/filing/0001193125-23-005000.md","text":"https://secwatch.observer/filing/0001193125-23-005000.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/887343/000119312523005000/0001193125-23-005000-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/887343/000119312523005000/d124899d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-20T17:22:11.014721+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"9a33456927c675f5a8904e935a1c72b573d99907","claim":"COLUMBIA BANKING SYSTEM, INC. amended Amendment No. 1 to Agreement and Plan of Merger with Umpqua Holdings Corporation and Cascade Merger Sub, Inc. (effective 2023-01-09).","evidence_excerpt":"On January 9, 2023, Columbia Banking System, Inc., a Washington corporation (“Columbia”), Umpqua Holdings Corporation, an Oregon corporation (“Umpqua”), and Cascade Merger Sub, Inc., a Delaware corporation and a direct, wholly-owned subsidiary of Columbia (“Merger Sub”), entered into Amendment No. 1 (the “Amendment”) to the Agreement and Plan of Merger, dated as of October 11, 2021 (the “Merger Agreement”), by and among Columbia, Umpqua, and Merger Sub.","evidence_source":"SEC 8-K Item 1.01/1.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/887343/000119312523005000/0001193125-23-005000-index.htm","confidence":0.9,"family_label":"Material Agreements","details":[{"label":"Action","value":"amendment"},{"label":"Agreement","value":"merger"},{"label":"Counterparty","value":"Umpqua Holdings Corporation and Cascade Merger Sub, Inc."},{"label":"Effective","value":"2023-01-09"}],"fact_type":"material_agreement"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}