{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-23-000204","form_type":"8-K","ticker":"MTB","cik":"0000036270","company_name":"M&T BANK CORP","filed_at":"2023-01-03T23:59:59+00:00","discovered_at":"2026-05-14T18:03:47.641779+00:00","generated_at":"2026-06-20T21:06:42.288210+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"M&T Bank director Calvin Butler Jr. resigns from board to become Exelon CEO","bullets":["Calvin G. Butler, Jr. stepped down from M&T's board effective Dec. 31, 2022.","Butler was named President and CEO of Exelon, effective Dec. 31, 2022.","He served on M&T's board since 2020; no replacement announced."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-23-000204","json":"https://secwatch.observer/filing/0001193125-23-000204.json","markdown":"https://secwatch.observer/filing/0001193125-23-000204.md","text":"https://secwatch.observer/filing/0001193125-23-000204.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/36270/000119312523000204/0001193125-23-000204-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/36270/000119312523000204/d432287d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-20T21:06:42.288210+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":"c88953d124","claim":"Calvin G. Butler, Jr. departed as Director at M&T BANK CORP.","evidence_excerpt":"In order to focus on his new role, Mr. Butler delivered notice to M&T Bank Corporation (“M&T”) on December 30, 2022, that he will be stepping down from the M&T Board of Directors effective as of December 31, 2022.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/36270/000119312523000204/0001193125-23-000204-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"stepped down"},{"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"}