James R. Scott - May 14, 2021 Form 4 Insider Report for FIRST INTERSTATE BANCSYSTEM INC (FIBK)

Role: Director, 10%+ Owner
Signature: /s/ Kirk D. Jensen, Attorney-in-Fact for Reporting Person
Stock symbol: FIBK
Transactions as of: May 14, 2021
Transactions value $: $0
Form type: 4
Date filed: 5/17/2021, 10:39 AM
Next filing: Jun 2, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	FIBK	Class A Common Stock	Conversion of derivative security	$0	+21.3K	+146.83%	$0.00	35.7K	May 14, 2021	By Trust
holding	FIBK	Class A Common Stock						17.8K	May 14, 2021	By 401(k)
holding	FIBK	Class A Common Stock						8.95K	May 14, 2021	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	FIBK	Class B Common Stock	Conversion of derivative security	$0	-21.3K	-1.06%	$0.00	1.99M	May 14, 2021	Class A Common Stock	21.3K	$0.00	By Trust	F1
holding	FIBK	Class B Common Stock						44.5K	May 14, 2021	Class A Common Stock	44.5K	$0.00	By Spouse	F1

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

Explanation of Responses:

Id	Content
F1	The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire.