{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-24-178071","form_type":"8-K","ticker":null,"cik":"0000836147","company_name":"MIDDLEFIELD BANC CORP","filed_at":"2024-07-12T23:59:59+00:00","discovered_at":"2026-05-14T18:03:16.019055+00:00","generated_at":"2026-05-31T21:36:27.971755+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.25,"calibrated_materiality_score":0.25,"confidence":"high","headline":"Director Darryl E. Mast will not stand for reelection at 2025 Annual Meeting","bullets":["Director Darryl E. Mast notified Middlefield Banc Corp. he will not run for reelection at the 2025 Annual Meeting.","Mast's departure is for personal reasons; no disagreement with management or board.","Mast served as director since 2013, including Audit, Executive, and Risk & Compliance committees.","His final day as Board member will be at the 2025 Annual Meeting."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-24-178071","json":"https://secwatch.observer/filing/0001193125-24-178071.json","markdown":"https://secwatch.observer/filing/0001193125-24-178071.md","text":"https://secwatch.observer/filing/0001193125-24-178071.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/836147/000119312524178071/0001193125-24-178071-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/836147/000119312524178071/d813595d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-31T21:36:27.971755+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":"87ed9dc137","claim":"Darryl E. Mast departed as Director at MIDDLEFIELD BANC CORP.","evidence_excerpt":"On July 8, 2024 Darryl E. Mast, a member of the Board of Directors (“Board”) of Middlefield Banc Corp. (the “Company”), notified the Company of his decision to not run for reelection as a Board member for the Company at its 2025 Annual Meeting, which will also be Mr. Mast’s final day as a Board member.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/836147/000119312524178071/0001193125-24-178071-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"not run for reelection"},{"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"}