Christopher L. Shepler - 10 Sep 2025 Form 4 Insider Report for FIRST INTERSTATE BANCSYSTEM INC (FIBK)

Role: Chief Banking Officer
Signature: /s/ Kirk D. Jensen, Attorney-in-Fact for Reporting Person
Issuer symbol: FIBK
Transactions as of: 10 Sep 2025
Net transactions value: +$74,987
Form type: 4
Filing time: 09 Oct 2025, 18:00:28 UTC
Next filing: 24 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Shepler Christopher L.	Chief Banking Officer	401 N. 31ST ST., BILLINGS	/s/ Kirk D. Jensen, Attorney-in-Fact for Reporting Person	09 Oct 2025	0002090710

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	FIBK	Common Stock	Award	$74,987	+2,308		$32.49	2,308	10 Sep 2025	Direct	F1

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

Explanation of Responses:

Id	Content
F1	Shares issuable upon vesting of restricted stock units granted to the reporting person pursuant to the Registrant's 2023 Equity and Incentive Plan. The restricted stock units vest in three equal annual installments beginning on September 10, 2026, subject to the reporting person's continued employment through each applicable vesting date.