{"filing":{"accession_number":"0000357173-26-000052","cik":"0000357173","ticker":"OSBC","company_name":"OLD SECOND BANCORP INC","form":"8-K","filing_date":"2026-10-19","report_date":"2026-10-14","primary_document":"osbc-20261014x8k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/357173/000035717326000052/osbc-20261014x8k.htm"},"events":[{"id":36082,"run_id":33267,"accession_number":"0000357173-26-000052","anchor_item_number":"5.02","event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"summary":"Gary Collins, Vice Chairman of Old Second Bancorp and Old Second National Bank, notified the Company on October 14, 2026 of his decision to retire effective October 31, 2026, and will resign from both boards. While the filing also discloses severance terms (cash payments, equity vesting, and benefit continuation), the principal disclosed action is the departure of a senior executive officer. The departure of a Vice Chairman is material to investors' assessment of the registrant's leadership and governance.","company_name":"OLD SECOND BANCORP INC","ticker":"OSBC","filing_date":"2026-10-19","form":"8-K","submitted_at":null,"items":[{"id":40362,"accession_number":"0000357173-26-000052","item_number":"5.02","item_title":null,"event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"Gary Collins, Vice Chairman of Old Second Bancorp and Old Second National Bank, notified the Company on October 14, 2026 of his decision to retire effective October 31, 2026, and will resign from both boards. While the filing also discloses severance terms (cash payments, equity vesting, and benefit continuation), the principal disclosed action is the departure of a senior executive officer. The departure of a Vice Chairman is material to investors' assessment of the registrant's leadership and governance.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-19T20:16:37.072746+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":40362,"accession_number":"0000357173-26-000052","item_number":"5.02","item_title":null,"event_type":"exec_departure","event_domain":"governance","is_material":true,"confidence":0.92,"reasoning":"Gary Collins, Vice Chairman of Old Second Bancorp and Old Second National Bank, notified the Company on October 14, 2026 of his decision to retire effective October 31, 2026, and will resign from both boards. While the filing also discloses severance terms (cash payments, equity vesting, and benefit continuation), the principal disclosed action is the departure of a senior executive officer. The departure of a Vice Chairman is material to investors' assessment of the registrant's leadership and governance.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-10-19T20:16:37.072746+00:00","company_name":"OLD SECOND BANCORP INC","ticker":"OSBC","filing_date":"2026-10-19"}]}