{"schema_version":"secwatch.filing_event.v1","accession":"0001015328-25-000140","form_type":"8-K","ticker":"WTFC","cik":"0001015328","company_name":"WINTRUST FINANCIAL CORP","filed_at":"2025-06-13T23:59:59+00:00","discovered_at":"2026-05-14T18:02:47.153386+00:00","generated_at":"2026-05-19T07:28:40.388564+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Director Richard L. Postma resigns from Wintrust board effective June 11, 2025","bullets":["Richard L. Postma resigned from the Board of Directors for personal reasons.","Resignation effective immediately on June 11, 2025.","Mr. Postma's departure not due to any disagreement with the Company on operations, policies or practices."],"urls":{"canonical":"https://secwatch.observer/filing/0001015328-25-000140","json":"https://secwatch.observer/filing/0001015328-25-000140.json","markdown":"https://secwatch.observer/filing/0001015328-25-000140.md","text":"https://secwatch.observer/filing/0001015328-25-000140.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1015328/000101532825000140/0001015328-25-000140-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1015328/000101532825000140/wtfc-20250611.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-19T07:28:40.388564+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":"b9e86fe49a","claim":"Richard L. Postma resigned as Director at WINTRUST FINANCIAL CORP.","evidence_excerpt":"On June 11, 2025, Richard L. Postma submitted his resignation from the Board of Directors of Wintrust Financial Corporation (the “Company”), effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1015328/000101532825000140/0001015328-25-000140-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}