On April 25, 2017, First Interstate BancSystem, Inc. (the “Registrant”) issued a press release regarding its financial results for the quarter ended March 31, 2017. A copy of the press release is furnished herewith as Exhibit 99.1 and is incorporated by reference herein. The information in this report shall not be treated as “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference into any registration statement or other document to the Securities Act of 1933 or the Securities Exchange Act of 1934.

Item 9.01>Financial Statements and Exhibits.

(d) Exhibit 99.1 – Press Release dated April 25, 2017 regarding the Registrant’s financial results for the quarter ended March 31, 2017.

About FIRST INTERSTATE BANCSYSTEM, INC. (NASDAQ:FIBK)

First Interstate BancSystem, Inc. is a financial and bank holding company. The Company, through its bank subsidiary First Interstate Bank (the Bank), delivers a range of banking products and services to individuals, businesses, municipalities and other entities. The Company operates through community banking segment. Its community banking segment provides customers with commercial and consumer banking products and services in its market areas through community service activities. The Company also offers Internet and mobile banking services. In addition to its primary emphasis on commercial and consumer banking services, the Company also offers trust, employee benefit, investment and insurance services through its bank subsidiary. It operates approximately 80 banking offices, including detached drive up facilities, in over 40 communities located in Montana, Wyoming and western South Dakota.

FIRST INTERSTATE BANCSYSTEM, INC. (NASDAQ:FIBK) Recent Trading Information

FIRST INTERSTATE BANCSYSTEM, INC. (NASDAQ:FIBK) closed its last trading session up +0.05 at 40.10 with 156,287 shares trading hands.