UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (date of earliest event reported): March 15, 2011

FIRST INTERSTATE BANCSYSTEM, INC.

(Exact name of registrant as specified in its charter)

Montana		001-34653		81-0331430
(State or other jurisdiction of incorporation or organization)		(Commission File No.)		(IRS Employer Identification No.)

401 North 31^st Street, Billings, MT 59116
(Address of principal executive offices, including zip code)

(406) 255-5390
(Registrant’s telephone number, including area code)

Not Applicable
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o		Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o		Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o		Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o		Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

 

 

Item 8.01		Other Events.

On March 15, 2011, First Interstate BancSystem, Inc. (the “Registrant”) released its 2010 Letter to the Shareholders. The 2010 Letter to the Shareholders is attached as Exhibit 99 to this Current Report on Form 8-K.

Item 9.01		Financial Statements and Exhibits.

(c)

Exhibit 99 — 2010 Letter to the Shareholders

SIGNATURES

     Pursuant to the requirements of the Securities and Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: March 15, 2011