0001047469-03-019339 Sample Contracts

EXHIBIT 4.1 OLD SECOND BANCORP, INC.

Indenture • May 20th, 2003 • Old Second Bancorp Inc • State commercial banks • Illinois

• Contract Type
  Indenture
• Filed
  May 20th, 2003
• Company
  Old Second Bancorp Inc
• Industry
  State commercial banks
• Jurisdiction
  Illinois

M&I Marshall & Ilsley Bank

Line of Credit Facility Agreement • May 20th, 2003 • Old Second Bancorp Inc • State commercial banks • Wisconsin

• Contract Type
  Line of Credit Facility Agreement
• Filed
  May 20th, 2003
• Company
  Old Second Bancorp Inc
• Industry
  State commercial banks
• Jurisdiction
  Wisconsin

This Letter Agreement (the "Agreement") is made and entered into as of the 1st day of May, 2003, by and between Old Second Bancorp, Inc. (the "Customer") and M&I Marshall & Ilsley Bank (the "Lender").