{"url_path":"/sec/osbc/8-k/2026-07-22/item-9-01","section_key":"item-9-01","section_title":"Item 9.01 Financial Statements and Exhibits**","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-07-22","source_url":"https://www.sec.gov/Archives/edgar/data/357173/0000357173-26-000042-index.html","accession_number":"0000357173-26-000042","cik":"0000357173","ticker":"OSBC","issuer_name":"OLD SECOND BANCORP INC","edgar_url":"https://www.sec.gov/Archives/edgar/data/357173/0000357173-26-000042-index.html","primary_entity_key":"0000357173","primary_entity_name":"OLD SECOND BANCORP INC"},"word_count":156,"has_tables":true,"body_markdown":"**Item 9.01 Financial Statements and Exhibits**\n\n​\n\n​\n\n​\n\n​\n\nExhibit No.\n\n​\n\nDescription\n\n99.1\n\n​\n\n[Press Release of Old Second Bancorp, Inc. dated July 22, 2026](osbc-20260722xex99d1.htm)\n\n​\n\n​\n\n​\n\n99.2\n\n​\n\n[Loan Portfolio Disclosures for Old Second Bancorp, Inc. dated June 30, 2026](osbc-20260722xex99d2.htm)\n\n​\n\n​\n\n​\n\n104\n\n​\n\nCover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document)\n\n​\n\n​\n\n​\n\n​\n\n​\n\n2\n\n​\n\n​\n\n​\n\n**Signature**\n\nPursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.\n\n​\n\n​\n\n​\n\n​\n\n​\n\n​\n\n**OLD SECOND BANCORP, INC.**\n\n​\n\n​\n\n​\n\n​\n\n​\n\n​\n\nDated: July 22, 2026\n\nBy:\n\n/s/ Bradley S. Adams\n\n​\n\n​\n\nBradley S. Adams\n\n​\n\n​\n\nExecutive Vice President,\n\n​\n\n​\n\nChief Operating Officer and\n\n​\n\n​\n\nChief Financial Officer\n\n​\n\n​\n\n3\n\n​"}