Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees - 01 Dec 2025 Form 4 Insider Report for FIRST INTERSTATE BANCSYSTEM INC (FIBK)

Reporting relationship: 10%+ Owner
Issuer ticker: FIBK
Reported as of: 01 Dec 2025
Net transaction value: -$327,500
SEC form: 4
Accepted by SEC: 01 Dec 2025, 12:58:26 UTC
Prior SEC filing: 03 Nov 2025
Source filing: View source filing
Reporting owner signature: SUSAN SCOTT HEYNEMAN TRUST, SUSAN HEYNEMAN & FIRST INTERSTATE WEALTH MANAGEMENT CO-TRUSTEES, By: /s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person

Key filing fact

Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees filed Form 4 for FIRST INTERSTATE BANCSYSTEM INC (FIBK) on 01 Dec 2025.

Key facts

This page summarizes Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees's Form 4 filing for FIRST INTERSTATE BANCSYSTEM INC (FIBK).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 01 Dec 2025, 12:58.

Change

Previous filing in this sequence was filed on 03 Nov 2025.
Current net transaction value: -$327,500.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001908880 Primary reporting owner

Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees

Relationship: 10%+ Owner
Address: P.O. BOX 7113, BILLINGS,
Signature: SUSAN SCOTT HEYNEMAN TRUST, SUSAN HEYNEMAN & FIRST INTERSTATE WEALTH MANAGEMENT CO-TRUSTEES, By: /s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person
Signature date: 01 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

FIBK transaction

Common Stock

Sale

Transaction value: $327,500
Shares: -10,000
Change %: -4.3%
Price: $32.75
Shares after: 224,460
Date: 01 Dec 2025
Ownership: See Footnote
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Composed of 224,460 shares held of record by Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees.

Footnote 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.