FIRST INTERSTATE BANCSYSTEM INC — Director's Dealing 2011

May 20, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: FIRST INTERSTATE BANCSYSTEM INC (FIBK)
CIK: 0000860413
Period of Report: 2011-05-19

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-19	Class A Common Stock	S	207	$13.68	Disposed	10915	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	2617	Indirect