OLD SECOND BANCORP INC — Earnings Release 2011

Feb 2, 2011

*UNITED STATES*

*SECURITIES AND EXCHANGE COMMISSION*

*WASHINGTON, D.C. 20549*

*FORM 8-K*

*CURRENT REPORT*

*Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934*

Date of Report (Date of earliest event reported) February 2, 2011

*Old Second Bancorp, Inc.*

(Exact name of Registrant as specified in its charter)

Commission File Number 0-10537

Delaware	3 6-3143493
(State or other jurisdiction of incorporation)	(I.R.S. Employer Identification Number)

*37 South River Street*

*Aurora, Illinois 60507*

(Address of principal executive offices, including zip code)

*(630) 892-0202*

(Registrant’s telephone number, including area code)

*N/A*

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions ( see General Instruction A.2 below):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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*Item 2.02 Results of Operations and Financial Condition*

On February 2, 2011, Old Second Bancorp, Inc. issued a press release announcing its earnings for the fourth fiscal quarter ended December 31, 2010. The press release is attached as Exhibit 99.1.

*Item 9.01 Financial Statements and Exhibits*

(d) Exhibits

99.1 Press release dated February 2, 2011

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*SIGNATURES*

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

/s/ J. Douglas Cheatham
J. Douglas Cheatham
Executive Vice President and Chief Financial Officer

2

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