{"url_path":"/sec/osbc/8-k/2026-07-08/item-5-02","section_key":"item-5-02","section_title":"Item 5.02 **","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-07-08","source_url":"https://www.sec.gov/Archives/edgar/data/357173/0000357173-26-000037-index.html","accession_number":"0000357173-26-000037","cik":"0000357173","ticker":"OSBC","issuer_name":"OLD SECOND BANCORP INC","edgar_url":"https://www.sec.gov/Archives/edgar/data/357173/0000357173-26-000037-index.html","primary_entity_key":"0000357173","primary_entity_name":"OLD SECOND BANCORP INC"},"word_count":418,"has_tables":true,"body_markdown":"**Item 5.02**\n\n**Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.**\n\n​\n\nEffective July 7, 2026, John Williams, Jr., a member of the Board of Directors (the “Board”) of Old Second Bancorp, Inc. (the “Company”), resigned from the Board. Mr. Williams, Jr. submitted his resignation in accordance with the Company’s Director Resignation Policy, which requires that any person serving as a director submit his or her resignation as a director upon attaining the age of 73 during his or her tenure. As such, Mr. Williams, Jr.’s resignation is not the result of any disagreement with the Company. Mr. Williams, Jr. served on the Risk and Insurance Committee. He has been a valuable Board member since 2021, and the Company appreciates his contributions during his tenure.\n\n​\n\nThe Company does not anticipate immediately filling the vacancy on the Board caused by Mr. Williams, Jr.’s resignation and will reduce the size of the Board by one member. Following a recommendation from the Nominating and Corporate Governance Committee, the Board’s intent is to maintain the Board classes to be as nearly equal in number as possible.\n\n​\n\n**Cautionary Statement Regarding Forward Looking Statements**\n\n​\n\nStatements included in this current report which are not historical in nature are intended to be, and are hereby identified as, forward looking statements for purposes of the safe harbor provided by Section 21E of the Securities Exchange Act of 1934. Forward looking statements generally include words such as “expects,” “anticipates,” “intends,” “estimates,” and other similar expressions. The Company cautions readers that forward looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from anticipated results. Such risks and uncertainties include, among others, factors disclosed in the Company’s 2025 Annual Report on Form 10-K filed February 26, 2026 or in its subsequent filings with the U.S. Securities and Exchange Commission, any of which could cause actual results to differ materially from future results expressed or implied by such forward looking statements.\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 8, 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​"}