FIRST INTERSTATE BANCSYSTEM INC — Director's Dealing 2016

May 2, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: FIRST INTERSTATE BANCSYSTEM INC (FIBK)
CIK: 0000860413
Period of Report: 2016-04-28

Reporting Person: RILEY KEVIN P (Exec. Vice Pres. & CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-04-28	Class A Common Stock	S	1200	$27.4876	Disposed	37977	Direct
2016-04-28	Class A Common Stock	P	1200	$27.4972	Acquired	34305	Indirect

Footnotes

F1: Market purchase and sale of stock to achieve a rollover from direct ownership by reporting person to indirect ownership by reporting person's IRA. Purchase and sale transactions did not result in a change to the reporting person's pecuniary interest in the shares.

F2: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.47 to $27.495. The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above.

F3: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $27.4943 to $27.50. Reporting Person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding number of shares purchased at each separate price within the range set forth in this Form 4.