Old Second Bancorp Inc (NASDAQ: OSBC) is a community banking company that operates through its subsidiary Old Second National Bank, providing deposit, lending, and investment advisory services. Revenue is generated primarily through net interest income on loans and deposits, supplemented by fee-based services. The company evaluates its operations as a single community banking segment, according to its 10-K filed February 26, 2026. Old Second is headquartered in Illinois and expanded its footprint on July 1, 2025, when it completed the acquisition of Bancorp Financial Inc., whose subsidiary Evergreen Bank Group merged into Old Second National Bank. Subsidiaries include Old Second Affordable Housing Fund LLC, which provides down payment assistance for qualified home buyers, and River Street Advisors LLC, an investment advisory and management services entity formed in May 2010. Foreclosure-related properties are held through Station I, II, and III LLCs.

Revenue model

Net interest income from loans and deposits, supplemented by fee income from investment advisory and management services through River Street Advisors LLC. Single community banking segment as disclosed in the 10-K filed February 26, 2026.

Products and services

Community banking services including deposit accounts, lending products, investment advisory and management services (River Street Advisors LLC), and affordable housing down payment assistance programs (Old Second Affordable Housing Fund LLC).

Customers and end markets

Retail and commercial banking customers in Illinois. Affordable housing program serves qualified individual home buyers. Investment advisory services serve individual and institutional clients.

Value-chain role

Community bank and financial intermediary. Accepts deposits and extends credit to individuals and businesses. Provides ancillary investment advisory and housing finance services.

Geographic exposure

Illinois, with expanded footprint following the July 1, 2025 acquisition of Bancorp Financial Inc. and merger of Evergreen Bank Group into Old Second National Bank.

Source: SEC 10-K, filed 2026-02-26

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