{"schema_version":"secwatch.filing_event.v1","accession":"0000357173-26-000028","form_type":"8-K","ticker":"OSBC","cik":"0000357173","company_name":"OLD SECOND BANCORP INC","filed_at":"2026-06-09T15:00:08+00:00","discovered_at":"2026-06-09T15:01:00.281185+00:00","generated_at":"2026-06-09T15:01:21.566289+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.35,"calibrated_materiality_score":0.35,"confidence":"high","headline":"Director Dennis Klaeser resigns from Old Second Bancorp board, effective June 5, 2026","bullets":["Dennis Klaeser resigned from the Board and Old Second National Bank board, effective immediately.","Resignation not due to any disagreement with the company; served since 2021.","Klaeser served on Executive, Audit, Compensation, Risk, and Capital Committees.","Board size reduced by one; vacancy not immediately filled.","Mr. Klaeser was a Class II director with term expiring at 2027 annual meeting."],"urls":{"canonical":"https://secwatch.observer/filing/0000357173-26-000028","json":"https://secwatch.observer/filing/0000357173-26-000028.json","markdown":"https://secwatch.observer/filing/0000357173-26-000028.md","text":"https://secwatch.observer/filing/0000357173-26-000028.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/357173/000035717326000028/0000357173-26-000028-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/357173/000035717326000028/osbc-20260605x8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-09T15:01:21.566289+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":"7d5d4d2c1f","claim":"Dennis Klaeser resigned as Director at OLD SECOND BANCORP INC.","evidence_excerpt":"On June 5, 2026, Dennis Klaeser, a member of the Board of Directors (the “Board”) of Old Second Bancorp, Inc. (“Old Second”) and the Board of Directors (the “Bank Board”) of its subsidiary bank, Old Second National Bank, notified Old Second of his resignation from the Board and Bank Board.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/357173/000035717326000028/0000357173-26-000028-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"}