Kevin P. Riley - Mar 15, 2022 Form 4 Insider Report for FIRST INTERSTATE BANCSYSTEM INC (FIBK)

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	FIBK	Class A Common Stock	Award	$0	+19.1K	+46.79%	$0.00	60K	Mar 15, 2022	Direct	F1
transaction	FIBK	Class A Common Stock	Award	$0	+6.21K	+10.36%	$0.00	66.2K	Mar 15, 2022	Direct	F2
transaction	FIBK	Class A Common Stock	Tax liability	-$74K	-1.89K	-2.85%	$39.24	64.3K	Mar 15, 2022	Direct	F3
transaction	FIBK	Class A Common Stock	Tax liability	-$48.9K	-1.25K	-1.94%	$39.24	63K	Mar 15, 2022	Direct	F3
holding	FIBK	Class A Common Stock						510	Mar 15, 2022	As Custodian under UTMA - 4
holding	FIBK	Class A Common Stock						250	Mar 15, 2022	As Custodian under UTMA - 5
holding	FIBK	Class A Common Stock						790	Mar 15, 2022	As Custodian under UTMA -3
holding	FIBK	Class A Common Stock						790	Mar 15, 2022	As Custodian under UTMA -2
holding	FIBK	Class A Common Stock						76.7K	Mar 15, 2022	By IRA
holding	FIBK	Class A Common Stock						790	Mar 15, 2022	As Custodian under UTMA -1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Id	Content
F1	Shares issued for no consideration pursuant to the Registrant's 2015 Equity Incentive Plan, and vest in three equal portions on March 15th of the first, second, and third years following the year in which the grant is made.
F2	Shares awarded in conjunction with a Performance Share Agreement in connection to Restricted Stock Award Plan that vested upon the satisfaction of performance criteria other than the price of the issuer's stock.
F3	Disposition to the issuer of issuer securities in payment of minimum required withholding taxes due upon vesting of unvested shares.