Form 4 for FIBK FIRST INTERSTATE BANCSYSTEM INC

Accepted 2025-07-15 00:00:00 ET · period of report 2025-07-14 · accession 0001641172-25-019763 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
I	2025-07-15	2025-07-14	FIBK	Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees	10%	S - Sale	$31.11	-55.0K	584.3K	-9%	-$1.71M

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2025-07-14	S	D	55,000	$31.11	584,256	I See Footnote	—	—	(F3) The price reported in column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging form $30.85 to $31.31. The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holders of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon request, the full information regarding the number of shares sold at each separate price within the ranges set forth above. (F1) Composed of 584,256 shares held of record by Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees. (F2) As a result of certain agreements entered into by and among the reporting persons, the Issuer, and certain other stockholders of the Issuer, the reporting persons may be deemed members of a group with the other signatories thereto and may be deemed to share beneficial ownership of the securities reported herein. Each of the reporting persons disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein. The reporting persons expect to file future Forms 4, if any, together with Susan Scott Heyneman, Trust.