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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
1198511	H David Crum	2873 Ardon Lane Casper WY 82609		Yes	No	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	2010-10-28	5,021	$12.78	6,435	No	4	P	Indirect	By Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Trust

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
Class A Common Stock	Class B Common Stock	$0.00	2010-03-05	2029-12-31	36,796	36,796	Indirect

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
2029-12-31	36,796	36,796	Indirect

Footnotes

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $12.75 to $12.82. 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.
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. All stock and stock option awards made prior to the recapitalization are exercisable for shares of Class B common stock.