{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-158231","form_type":"8-K","ticker":"COLB","cik":"0000887343","company_name":"COLUMBIA BANKING SYSTEM, INC.","filed_at":"2025-07-11T23:59:59+00:00","discovered_at":"2026-05-14T18:02:46.594773+00:00","generated_at":"2026-05-18T07:03:54.850016+00:00","sec_items":["8.01"],"event_type":"litigation","sentiment":"negative","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"Columbia Banking faces three shareholder lawsuits over merger with Pacific Premier; adds proxy disclosures","bullets":["Three complaints filed: Siegel (Columbia shareholders), Clark and Parshall (Pacific Premier stockholders) allege breach of fiduciary duty and misrepresentations in merger proxy.","Columbia and Pacific Premier deny allegations but voluntarily supplement Joint Proxy Statement/Prospectus to moot disclosure claims without admitting liability.","Supplemental disclosures include additional merger background, comparable company analyses, discount rate calculations, and pro forma EPS/TBV accretion/dilution.","Complaints seek injunctive relief to stop shareholder vote on share issuance until omitted information is disclosed, and rescission if consummated.","Additional demand letters from shareholders also demand supplemental disclosures; more similar complaints may be filed."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-158231","json":"https://secwatch.observer/filing/0001193125-25-158231.json","markdown":"https://secwatch.observer/filing/0001193125-25-158231.md","text":"https://secwatch.observer/filing/0001193125-25-158231.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/887343/000119312525158231/0001193125-25-158231-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/887343/000119312525158231/d902860d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-18T07:03:54.850016+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"}