O2 Sponsor Finance Hires Aaron Markos as Senior Vice President

O2 Sponsor Finance, a division of Old Second National Bank, has hired Aaron Markos as Senior Vice President. Markos will source, structure, and underwrite new lending opportunities while working with equity sponsors and management teams, supporting the unit's expansion across the lower middle market sponsor finance landscape. He previously held sponsor finance and direct lending roles at Deerpath Capital Management, First Midwest Bank, and Fifth Third Bank. Parent company Old Second Bancorp (NASDAQ: OSBC) reported approximately $6.9 billion in assets, $5.4 billion in deposits, and $5.2 billion in loans as of June 30, 2026.

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