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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	Disposition	2015-08-28	804	$0.00	8,636	No	4	J	Direct
Class A Common Stock	Acquisiton	2015-08-28	804	$0.00	16,996	No	4	J	Indirect	By Trust
Class A Common Stock	Acquisiton	2015-08-31	1,776	$0.00	1,776	No	4	C	Indirect	By IRA
Class A Common Stock	Acquisiton	2015-08-31	800	$17.00	9,436	No	4	M	Direct
Class A Common Stock	Disposition	2015-08-31	800	$26.51	8,636	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	J	Direct
No	4	J	Indirect	By Trust
No	4	C	Indirect	By IRA
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 A Common Stock	Class B Common Stock	Disposition	2015-08-31	1,776	$0.00	1,776	$0.00
Class B Common Stock	Stock Options	Disposition	2015-08-31	800	$17.00	800	$17.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2010-03-05	2029-12-31	No	4	C	Indirect
1,000	2006-01-26	2016-01-26	No	4	M	Direct

Reported Non-Derivative Holdings

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

Footnotes

Change in form of beneficial ownership from direct ownership to indirect ownership by trust.
The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $26.51 to $26.53. 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.
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.
Simultaneous with exercise of stock options, an election was made to immediately convert Class B commons shares received to Class A common shares.