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FIRST INTERSTATE BANCSYSTEM INC Director's Dealing 2025

Sep 2, 2025

31290_dirs_2025-09-02_8c97c293-86cc-40ac-a750-4e3152f9e63f.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: FIRST INTERSTATE BANCSYSTEM INC (FIBK)
CIK: 0000860413
Period of Report: 2025-09-02

Reporting Person: Susan Scott Heyneman Trust, Susan Heyneman & First Interstate Wealth Management Co-Trustees (10% Owner)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2025-09-02 Common Stock S 10000 $32.28 Disposed 519256 Indirect

Footnotes

F1: Composed of 519,256 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.