THE CORPORATE LIBRARY

Related Party Transactions and Outside Related Director Information

Old Second Bancorp, Inc. (OSBC)

3/16/2006 Proxy Information

Our directors and executive officers and their associates were customers of, and had transactions with, Old Second and our subsidiaries in the ordinary course of business during 2005. Additional transactions may be expected to take place in the future. All outstanding loans, commitments to loan, transactions in repurchase agreements, certificates of deposit and depository relationships, in the opinion of management, were in the ordinary course of business and were made on substantially the same terms, including interest rates, collateral and repayment terms on extensions of credit, as those prevailing at the time for comparable transactions with other persons and did not involve more than the normal risk of collectibility or present unfavorable features.

3/22/2005 Proxy Information

Our directors and executive officers and their associates were customers of, and had transactions with, Old Second and our subsidiaries in the ordinary course of business during 2004. Additional transactions may be expected to take place in the future. All outstanding loans, commitments to loan, transactions in repurchase agreements, certificates of deposit and depository relationships, in the opinion of management, were in the ordinary course of business and were made on substantially the same terms, including interest rates, collateral and repayment terms on extensions of credit, as those prevailing at the time for comparable transactions with other persons and did not involve more than the normal risk of collectibility or present unfavorable features.