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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
860413	First Interstate Bancsystem Inc	FIBK	State Commercial Banks (6022)	810331430

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1546223	G. Michael Huston	Po Box 30918 Billings MT 59116	Ex. Vp & Chief Banking Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Class A Common Stock	Acquisiton	2013-04-30	3,600	$13.87	11,999	No	4	M	Direct
Class A Common Stock	Disposition	2013-04-30	3,600	$20.01	8,399	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class B Common Stock	Stock Options	Disposition	2013-04-30	3,600	$13.87	3,600	$13.87

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2005-02-03	2015-02-03	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Class A Common Stock	14,698	Indirect	By Trust
Class A Common Stock	4,972	Indirect	By 401(k) Plan

Footnotes

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.97 to $20.07. 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.
Simultaneous with exercise of stock options, Reporting Person elected to immediately convert Class B common shares received pursuant to option exercise to Class A common shares.