Old Second Bancorp, Inc. (the “Company” or “Old Second”) (Nasdaq: OSBC), parent company of Old Second National Bank (the “Bank”), will host its Fiscal 2011 Second Quarter earnings conference call on Thursday, July 28, 2011 at 11:00 a.m. Eastern Time (10:00 a.m. Central Time). Investors may listen to the Company’s earnings call via telephone by dialing 877-407-9205. Investors should call in to the dial-in number below at least 10 minutes prior to the scheduled start of the call.

A replay of the earnings call will be available until 12:00 p.m. Eastern Time (11:00 a.m. Central Time) on August 11, 2011, by dialing 877-660-6853, using Account Number 286, and Conference ID 375905.

  Old Second Bancorp, Inc Second Quarter Earnings Conference Call

11:00 a.m. ET (10:00 a.m. Central), Thursday, July 28, 2011

Dialing 877-407-9205

A copy of the Company’s press release announcing our earnings, the Form 8-K used to file the release with the Securities and Exchange Commission, and any other financial and statistical information about the period covered in the conference call will be available under the “Investor Relations” heading on the company website: www.oldsecond.com

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