Kevin P. Riley - Mar 15, 2023 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	Tax liability	-$11.1K	-354	-0.8%	$31.39	43.9K	Mar 15, 2023	Direct	F1
transaction	FIBK	Class A Common Stock	Tax liability	-$43.9K	-1.4K	-3.19%	$31.39	42.5K	Mar 15, 2023	Direct	F1
transaction	FIBK	Class A Common Stock	Tax liability	-$90.7K	-2.89K	-6.8%	$31.39	39.6K	Mar 15, 2023	Direct	F1
transaction	FIBK	Class A Common Stock	Award	$0	+6.55K	+16.55%	$0.00	46.1K	Mar 15, 2023	Direct	F2
transaction	FIBK	Class A Common Stock	Tax liability	-$93.3K	-2.97K	-6.44%	$31.39	43.2K	Mar 15, 2023	Direct	F1
transaction	FIBK	Class A Common Stock	Award	$0	+9.65K	+22.36%	$0.00	52.8K	Mar 15, 2023	Direct	F3
holding	FIBK	Class A Common Stock						92.6K	Mar 15, 2023	By IRA
holding	FIBK	Class A Common Stock						1.04K	Mar 15, 2023	As Custodian under UTMA -1
holding	FIBK	Class A Common Stock						1.04K	Mar 15, 2023	As Custodian under UTMA -2
holding	FIBK	Class A Common Stock						1.04K	Mar 15, 2023	As Custodian under UTMA -3
holding	FIBK	Class A Common Stock						760	Mar 15, 2023	As Custodian under UTMA - 4
holding	FIBK	Class A Common Stock						500	Mar 15, 2023	As Custodian under UTMA - 5
holding	FIBK	Class A Common Stock						250	Mar 15, 2023	As Custodian under UTMA - 6

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

Id	Content
F1	Disposition to the issuer of issuer securities in payment of minimum required withholding taxes due upon vesting of unvested shares.
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	Shares issued for no consideration pursuant to the Registrant's Equity Incentive Plan vesting in two years following the year in which the grant is made.