Old Second Bancorp, Inc.
Old Second Bancorp, Inc. (Nasdaq: OSBC) is a bank holding company whose wholly owned Old Second National Bank conducts a full-service community banking and trust business. It provides deposit accounts, commercial and consumer lending, residential mortgages, electronic banking, corporate cash management, and wealth… From the company’s description.
Over the twelve months to Sep 30, 2026, Old Second Bancorp, Inc. reported revenue of $382.69M, up 20.6% from a year earlier, and net income of $111.49M. Its pre-tax margin was 39.2%. In fiscal 2025, it reported revenue of $339.33M, up 18.9% from fiscal 2024, and net income of $80.31M.
Margins and return on equity change in ; everything else in percent. Fewer shares and less debt are shown plainly, not as bad news — it depends what you make of buybacks. Dotted labels explain each measure. is shown separately from the annual figures.
What Old Second Bancorp, Inc. does
In the company’s own words
Old Second Bancorp, Inc. (Nasdaq: OSBC) is a bank holding company whose wholly owned Old Second National Bank conducts a full-service community banking and trust business. It provides deposit accounts, commercial and consumer lending, residential mortgages, electronic banking, corporate cash management, and wealth management, investment, agency and custodial services to individuals, businesses, public entities, and nonprofit organizations. The company operates as one reportable segment: community banking. Its principal market is northeastern Illinois, where the bank serves customers through 55 banking centers; commercial, sponsor finance, leasing and healthcare lending relationships also extend nationwide. Following its July 2025 acquisition of Bancorp Financial, the business added nationwide powersport, collector-car and manufactured-home lending. At December 31, 2025, Old Second had 1,062 full-time equivalent employees and approximately $2.29 billion in assets under administration and/or management. Its website is www.oldsecond.com.
Company details
- Sector
- Financials
- Industry (SIC)
- Banks & Brokers
- Headquarters
- AURORA, IL
- Fiscal year end
- December
- CIK
- 357173
- SIC
- 6022
Financial performance, year by year
Fiscal 2011–2025 · USDThe full income statement, balance sheet and cash flow for each of these years — every figure traceable to its filing — is on the Financials tab with a free account.
Who owns Old Second Bancorp, Inc. — and what changed
Funds as of 2026Q2 · superinvestors as of 2026-06-30
Largest fund holders · Old Second Bancorp, Inc.’s weight in each
Fund ownership is a floor, not a census — pensions, insurers and people holding shares directly are not visible here.
Fund ownership counts N-PORT filers only, so it is a floor rather than a census — pensions, insurers and direct holders are not visible here, and the remainder is not “held by individuals”.
Every fund and institutional holder, quarter by quarter, is on the Ownership tab with a free account.
Recent filings
All filings →Each filing opens into its own statements and disclosures here.
Put this business in context.
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