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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):  May 7, 2015

Old Second Bancorp, Inc.

(Exact name of registrant as specified in its charter)

37 South River Street

Aurora, Illinois  60507

(Address of principal executive offices) (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):

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

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

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

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

Item 8.01.    Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangement of Certain Officers.

On May, 7, 2015, William Meyer notified the board of directors of Old Second Bancorp, Inc. (the “Company”) that he resigned from the board effective immediately.  Mr. Meyer informed the board that his decision was not due to any disagreement with the Company.  The Company’s board is currently assessing whether to fill the vacancy created by Mr. Meyer’s decision or eliminate such vacancy by reducing the size of the board.

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.