Form 4 for FIBK FIRST INTERSTATE BANCSYSTEM INC

Accepted 2026-09-16 19:04:11 ET · period of report 2026-09-16 · accession 0001493152-26-042992 · 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	2026-09-16 19:04	2026-09-16	FIBK	SCOTT JULIE A	10%	S - Sale	$37.64	-2,700	484.3K	-0.6%	-$101.6K

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	2026-09-16	S	D	2,700	$37.64	484,309	I See Footnote	—	—	(F1) Composed of 204,166 shares held of record by Julie A Scott-Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-02 (which trust effected the reported sale), 35,233 shares held of record by Juliana Sarah Scott Rose Trust, 35,232 shares held of record by Elizabeth Lauren Scott Rose Trust, and 209,678 shares held by IXL Limited Liability Company, over which Ms. Rose has shared voting and dispositive power with a sibling. (F2) As a result of certain agreements entered into among the reporting persons, the Issuer, and 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. The reporting persons disclaim beneficial ownership of any such securities, except to the extent of their pecuniary interests therein. The reporting persons expect to file future Forms 4 and 5, if any, together with Julie Scott Rose with the indication of direct or indirect ownership in Table I and Table II being made from Julie Scott Rose's perspective. The nature of beneficial ownership is described in detail by footnote for all reporting persons.