{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-091469","form_type":"8-K","ticker":"COLB","cik":"0000887343","company_name":"COLUMBIA BANKING SYSTEM, INC.","filed_at":"2025-04-23T23:59:59+00:00","discovered_at":"2026-05-14T18:02:51.628209+00:00","generated_at":"2026-05-23T08:46:18.692442+00:00","sec_items":["7.01","8.01","9.01"],"event_type":"m_and_a","sentiment":"positive","materiality_score":0.85,"calibrated_materiality_score":0.85,"confidence":"high","headline":"Columbia Banking to acquire Pacific Premier Bancorp in $2B all-stock deal","bullets":["COLB to acquire PPBI at 0.9150x exchange ratio, valuing PPBI at ~$20.83/share; combined assets ~$70B","Deal expected to deliver mid-teens EPS accretion to COLB; tangible book dilution earned back in ~3 years","Combined company will have ~$57B deposits; COLB gains top-10 deposit share in Southern California","Transaction expected to close in H2 2025; subject to regulatory and shareholder approvals","COLB plans to rename Umpqua Bank to Columbia Bank later this year"],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-091469","json":"https://secwatch.observer/filing/0001193125-25-091469.json","markdown":"https://secwatch.observer/filing/0001193125-25-091469.md","text":"https://secwatch.observer/filing/0001193125-25-091469.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/887343/000119312525091469/0001193125-25-091469-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/887343/000119312525091469/d908038d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-23T08:46:18.692442+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":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}