FIRST INTERSTATE BANCSYSTEM INC — Director's Dealing 2010

Nov 17, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: FIRST INTERSTATE BANCSYSTEM INC (FIBK)
CIK: 0000860413
Period of Report: 2010-11-15

Reporting Person: Castle Julie G (President, Financial Services)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-11-15	Class A Common Stock	S	1587	$14.50	Disposed	2617	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	4372	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Class B Common Stock	$0.00	2029-12-31	Class A Common Stock (8640)	8640	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.46 to $14.54. The Reporting Person undertakes to provide to the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

F2: On March 5, 2010, the Company recapitalized its existing common stock. The recapitalization included, among other things, a redesignation of existing common stock as Class B common stock, a four-for-one split of Class B common stock, and the creation of a new class of common stock designated as Class A common stock, which is listed on the NASDAQ stock market under the symbol "FIBK". The Class B common stock is convertible at any time into Class A common stock on a share for share basis at the descretion of the holder. The conversion feature of the Class B common stock does not expire.