AURORA, IL / ACCESS Newswire / January 21, 2026 / Old Second Bancorp, Inc. (the "Company," "Old Second," "we," "us," and "our") (NASDAQ:OSBC), the parent company of Old Second National Bank (the "Bank"), today announced financial results for the fourth quarter of 2025. Our net income was $28.8 million, or $0.54 per diluted share, for the fourth quarter of 2025, compared to net income of $9.9 million, or $0.18 per diluted share, for the third quarter of 2025, and net income of $19.1 million, or $0.42 per diluted share, for the fourth quarter of 2024.