X0306 4 2015-10-26 0 0000357173 OLD SECOND BANCORP INC OSBC 0001171803 PALMER GERALD 37 S. RIVER ST. AURORA IL 60506 1 0 0 0 Old Second Bancorp, Inc. Common Stock 2015-10-26 4 S 0 2500 6.55 D 52189 D Old Second Bancorp, Inc. Common Stock 2015-10-26 4 S 0 2500 6.5336 D 54689 D Old Second Bancorp, Inc. Common Stock 2015-10-26 4 S 0 2500 6.55 D 42727 I Spouse's Trust Old Second Bancorp, Inc. Common Stock 2015-10-26 4 S 0 2500 6.5336 D 45227 I Spouse's Trust Old Second Bancorp Inc. Stock Options 7.49 2010-02-17 2019-02-17 Common Stock 1500 1500 D Old Second Bancorp Inc. Stock Options 27.75 2008-12-18 2017-12-18 Common Stock 1500 1500 D Old Second Bancorp Inc. Stock Options 29.20 2007-12-17 2016-12-19 Common Stock 1500 1500 D Old Second Bancorp Inc. Stock Options 31.34 2005-12-20 2015-12-20 Common Stock 1500 1500 D Included in this total are 47,189 shares in Mr. Palmer's name as Trustee and 5,000 shares of restricted stock units in Mr. Palmer's name. The sale of the combined 5,000 shares brings the balance to 52,189 shares. These shares are held in a brokerage account on behalf of Mr.Palmer's spouse's Trust account. The sale of the combined 5,000 shares brings the balance to 42,727 shares. /s/ Gerald Palmer 2015-10-26