OLD SECOND BANCORP INC 8-K

What Happened
Old Second Bancorp, Inc. announced that Dennis Klaeser resigned from the Board of Directors of Old Second and the Board of Directors of its subsidiary Old Second National Bank effective June 5, 2026. The resignation is not the result of any disagreement with the company. Klaeser had served on the Board since 2021 and was a Class II director with a term expiring at the 2027 annual meeting.

Key Details

• Resignation date: June 5, 2026; 8-K filed June 9, 2026 (signed by Bradley S. Adams, EVP/COO/CFO).
• Director: Dennis Klaeser; board member since 2021; Class II director (term through 2027 annual meeting).
• Committee service: Executive Committee, Audit Committee, Compensation Committee, Risk Committee, Capital Committee.
• Board action: Old Second does not expect to immediately fill the vacancy and will reduce the size of the Board by one.

Why It Matters
A board departure can affect governance and committee workloads—Klaeser’s resignation removes an experienced director from multiple key committees, which may require reassignment of responsibilities. The company says the resignation was voluntary and not due to disagreement, and there is no immediate replacement planned, so investors should view this as a governance update rather than a management conflict or financial event. Monitor future filings for any announced nominee or committee reassignments.