Shares FIRST INTERSTATE BANCSYSTEM, INC. Class A Common Shares, without par value UNDERWRITING AGREEMENTUnderwriting Agreement • March 10th, 2010 • First Interstate Bancsystem Inc • State commercial banks • New York
First Interstate BancSystem, Inc., a Montana corporation (the “Company”), proposes to sell an aggregate of shares (the “Firm Shares”) of the Company’s Class A common shares, without par value (the “Common Shares”). In addition, the Company proposes to grant to the underwriters (the “Underwriters”) named in Schedule 1 attached to this agreement (this “Agreement”) an option to purchase up to additional shares of the Common Shares on the terms set forth in Section 2 (the “Option Shares”). The Firm Shares and the Option Shares, if purchased, are hereinafter collectively called the “Shares.” This is to confirm the agreement concerning the purchase of the Shares from the Company by the Underwriters.
