FIRST INTERSTATE BANCSYSTEM INC — Regulatory Filings 2010

Sep 2, 2010

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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): September 2, 2010

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

(Address of principal executive offices)

(406) 255-5390

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

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 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))

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link2 "Item 8.01 Other Events."

Item 8.01 Other Events.

On September 2, 2010, First Interstate BancSystem, Inc. (the “Registrant”) issued a press release announcing the appointment of Robert M. Cerkovnik as Senior Vice President and Chief Credit Officer.

link2 "Item 9.01 Financial Statements and Exhibits."

Item 9.01 Financial Statements and Exhibits.

(d) Exhibit 99.1 — Press Release dated September 2, 2010 announcing the appointment of Robert M. Cerkovnik as Senior Vice President and Chief Credit Officer.

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link1 " SIGNATURE"

SIGNATURE

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: September 2, 2010

FIRST INTERSTATE BANCSYSTEM, INC.
By:	/s/ LYLE R. KNIGHT
	Lyle R. Knight
	President and Chief Executive Officer

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