{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-26-028154","form_type":"8-K","ticker":"PB","cik":"0001068851","company_name":"PROSPERITY BANCSHARES INC","filed_at":"2026-01-29T23:59:59+00:00","discovered_at":"2026-05-14T18:02:34.493187+00:00","generated_at":"2026-05-16T06:16:13.272890+00:00","sec_items":["1.01","9.01"],"event_type":"m_and_a","sentiment":"neutral","materiality_score":0.85,"calibrated_materiality_score":0.85,"confidence":"high","headline":"Prosperity Bancshares to acquire Stellar Bancorp in stock+cash deal valued at $11.36 + 0.3803 shares per Stellar share","bullets":["Each Stellar share exchanged for 0.3803 PB shares plus $11.36 cash; Stellar options and awards cancelled for cash.","Stellar must pay $78M termination fee if deal breaks under certain circumstances.","PB enters voting agreements with Stellar directors covering ~8.8% of Stellar shares, agreeing to vote for merger.","Closing requires Stellar shareholder approval, regulatory nods (Fed, FDIC, Texas Dpt of Banking), and S-4 effectiveness.","PB will add two Stellar directors to its board and Prosperity Bank board post-closing."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-26-028154","json":"https://secwatch.observer/filing/0001193125-26-028154.json","markdown":"https://secwatch.observer/filing/0001193125-26-028154.md","text":"https://secwatch.observer/filing/0001193125-26-028154.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1068851/000119312526028154/0001193125-26-028154-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1068851/000119312526028154/d89446d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-16T06:16:13.272890+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":"9ade1dcaa41691f5c472899ab2c7418e753d3689","claim":"PROSPERITY BANCSHARES INC entered into Agreement and Plan of Merger with Stellar Bancorp, Inc. (effective 2026-01-27).","evidence_excerpt":"On January 27, 2026, Prosperity Bancshares, Inc., a Texas corporation (“Prosperity”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Stellar Bancorp, Inc., a Texas corporation (“Stellar”).","evidence_source":"SEC 8-K Item 1.01/1.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1068851/000119312526028154/0001193125-26-028154-index.htm","confidence":0.9,"family_label":"Material Agreements","details":[{"label":"Action","value":"entry"},{"label":"Agreement","value":"merger"},{"label":"Counterparty","value":"Stellar Bancorp, Inc."},{"label":"Effective","value":"2026-01-27"}]}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}