X0306 4 2016-06-08 0 0000357173 OLD SECOND BANCORP INC OSBC 0001673321 Pilmer Donald 37 S. RIVER ST. AURORA IL 60506 0 1 0 0 EVP Old Second Bancorp, Inc.Common Stock 2016-06-08 4 A 0 559 A 34095.054 D Old Second Bancorp, Inc. Common Stock 93 I Profit Sharing Plan These shares are an inheritance from a parent. They are held jointly with spouse. Of this total, 33,480 are restricted stock units, 36.054 shares are dividend equivalents in the form of restricted stock units, 559 shares held jointly with spouse and 20 shares are held by Mr. Pilmer as custodian. Does not apply. /s/ Donald Pilmer 2016-06-08