{"schema_version":"secwatch.filing_event.v1","accession":"0001437749-22-005270","form_type":"8-K","ticker":"MBWM","cik":"0001042729","company_name":"MERCANTILE BANK CORP","filed_at":"2022-03-04T23:59:59+00:00","discovered_at":"2026-05-14T18:04:05.232903+00:00","generated_at":"2026-06-27T01:24:57.719837+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.35,"calibrated_materiality_score":0.35,"confidence":"high","headline":"Mercantile Bank SVP & HR Director Lonna Wiersma retires; Brett Hoover named successor","bullets":["Lonna L. Wiersma, Senior Vice President and Human Resource Director, retired on March 4, 2022, after 23 years of service.","Brett Hoover, 51, appointed as Human Resource Director; Hoover has been with Mercantile Bank for over 15 years.","No further details on compensation or transition terms provided in the filing."],"urls":{"canonical":"https://secwatch.observer/filing/0001437749-22-005270","json":"https://secwatch.observer/filing/0001437749-22-005270.json","markdown":"https://secwatch.observer/filing/0001437749-22-005270.md","text":"https://secwatch.observer/filing/0001437749-22-005270.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1042729/000143774922005270/0001437749-22-005270-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1042729/000143774922005270/mbwm20220304_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-27T01:24:57.719837+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":"9fe3ac171a","claim":"Brett Hoover was appointed as Human Resource Director at MERCANTILE BANK CORP.","evidence_excerpt":"Brett Hoover, 51, will fill the role of Human Resource Director of Mercantile Bank.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1042729/000143774922005270/0001437749-22-005270-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Human Resource Director"}],"fact_type":"executive_change"},{"claim_id":"d4ef95a7a1","claim":"Lonna L. Wiersma retired as Senior Vice President and Human Resource Director at MERCANTILE BANK CORP.","evidence_excerpt":"On March 4, 2022, Lonna L. Wiersma, Senior Vice President and Human Resource Director of Mercantile Bank Corporation and its wholly-owned banking subsidiary, Mercantile Bank, retired.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1042729/000143774922005270/0001437749-22-005270-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"retired"},{"label":"Role","value":"Senior Vice President and Human Resource Director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}