X0303 4 2009-12-31 0 0000357173 OLD SECOND BANCORP INC OSBC 0001381317 Sloan Rodney 37 S. RIVER ST. AURORA IL 60506 0 1 0 0 Chief Risk Officer Old Second Bancorp Inc. Common Stock 2009-12-31 4 J 0 9 A 5435 I 401(K) Old Second Bancorp Inc. Common Stock 2009-12-31 4 J 0 2 A 1320 I Profit Sharing Old Second Bancorp Inc. Common Stock 11602 D Employee Stock Option (Right to Buy 32.59 2005-12-20 2014-12-21 Common Stock 7000 7000 D Employee Stock Option (Right to Buy 25.08 2005-12-20 2013-12-16 Common Stock 7000 7000 D Does not apply. Of this total, 9 shares were allocated during the fourth quarter pursuant to the Old Second Bancorp Inc. Salary and Savings Plan. Information provided herein is based on information provided by the Plan Trustee as of 12-31-09. Of this total, 2 shares were allocated during the fourth quarter pursuant to the Old Second Employees Profit Sharing Plan & Trust. Information provided herein is based on information provided by the Plan Trustee as of 12-31-09. Included in this total are 1,658 shares held in Mr. Sloan's name alone; 3,693 shares of restricted stock; 6,141 shares of restricted stock units in Mr. Sloan's name and 110 shares in a brokerage account. As a result of an inadvertent mistake, 442 shares, which represent vesting of restricted stock, were taken off of the total of 12,044 shares, thus reducing the amount to 11,602 shares. Shares restated for a 2 for 1 stock split effected in the form of a stock dividend payable 7-28-04. /s/ Rodney Sloan 2009-12-31