Director Dennis Klaeser resigns from Old Second Bancorp board, effective June 5, 2026

OLD SECOND BANCORP INC

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.

item 5.02

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Departed

Dennis Klaeser

Director

OSBC · OLD SECOND BANCORP INC

Effective: 2026-06-05
Filed: June 9, 2026, 11:00 AM ET

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.

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Executive change SEC 8-K Item 5.02 confidence 0.95

Dennis Klaeser resigned as Director at OLD SECOND BANCORP INC.

Action: resigned
Role: Director

Exact text from the filing

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.

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Source: SEC EDGAR

accession 0000357173-26-000028

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