X0202 4 2004-09-30 0 0000357173 OLD SECOND BANCORP INC OSBC 0001195341 CHEATHAM J DOUGLAS 37 S. RIVER ST. AURORA IL 60506 1 1 0 0 CFO Old Second Bancorp Inc. Common Stock 2004-09-30 4 J 0 92 A 2282 I 401(k) Plan Old Second Bancorp Inc. Common Stock 2004-09-30 4 J 0 4 A 2029 I Pr. Sh. Plan Old Second Bancorp Inc. Common Stock 1400 D Employee Stock Option (Right to Buy) 25.07 2004-12-16 2013-12-16 Common Stock 12000 12000 D Employee Stock Option (Right to Buy) 18.80 2003-12-17 2012-12-17 Common Stock 12000 12000 D Employee Stock Option (Right to Buy 14.71 2002-12-19 2011-12-19 Common Stock 10668 10668 D Employee Stock Option (Right to Buy 10.45 2000-12-14 2009-12-14 Common Stock 6666 6666 D Employee Stock Option (Right to Buy 8.91 2001-12-18 2010-12-18 Common Stock 12000 12000 D Does not apply. Of this total, 92 shares were allocated during the third quarter pursuant to the Old Second Bancorp Inc. Salary Savings Plan & Trust. Information provided herein is based on information provided by the Plan Trustee as of 9-30-04. Of this total, 1,107 shares represent a 2 for 1 stock split effected in the form of a stock dividend payable 7-28-04. Of this total, 4 shares were allocated during the third quarter pursuant to the Old Second Bancorp Inc. Employee Profit Sharing Plan & Trust. Information provided herein is based on information provided by the Plan Trustee as of 9-30-04. Of this total, 1,014 shares represent a 2 for 1 stock split effected in the form of a stock dividend payable 7-28-04. Of this total, 700 shares represent a 2 for 1 stock split effected in the form of a stock dividend payable 7-28-04. Restated for 2 for 1 stock split effected in the form of a stock dividend payable 7-28-04. Restated for 4 for 3 stock split effected in the form of a stock dividend payable 6-24-02 and restated for a 2 for 1 stock split effected in the form of a stock dividend payable 7-28-04. /s/ J. Douglas Cheatham 2004-09-30