FIRST INTERSTATE BANCSYSTEM INC — Director's Dealing 2025

Dec 15, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: FIRST INTERSTATE BANCSYSTEM INC (FIBK)
CIK: 0000860413
Period of Report: 2025-12-08

Reporting Person: SCOTT JAMES R (10% Owner)
Reporting Person: James R Scott Trust, James R Scott & First Interstate Wealth Management Co-TTEEs (10% Owner)
Reporting Person: JS Investments Limited Partnership (10% Owner)
Reporting Person: James R & Christine M Scott Foundation (10% Owner)
Reporting Person: Foundation for Community Vitality (10% Owner)
Reporting Person: James F Heyneman Conservatorship, James Scott, Conservator (10% Owner)
Reporting Person: James F Heyneman Trust, James Scott & First Interstate Wealth Management Co-Trustees (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-12	Common Stock	G	755	—	Disposed	4433966	Indirect
2025-12-12	Common Stock	G	755	—	Acquired	4433211	Indirect
2025-12-08	Common Stock	G	755	—	Disposed	4433966	Indirect
2025-12-08	Common Stock	G	755	—	Acquired	4433211	Indirect

Footnotes

F1: Shares disposed of by James R. Scott's spouse to Foundation for Community Vitality, and shares acquired by Foundation for Community Vitality from James R. Scott's spouse as a bona fide gift.

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 and 5, if any, together with James R. Scott with the indication of direct or indirect ownership in Tables I and II being made from James R. Scott's perspective unless expressly noted otherwise by footnote. The nature of beneficial ownership is described in detail by footnote for all reporting persons.

F3: Composed of 1,989,882 shares held of record by James R Scott Trust, James R Scott & First Interstate Wealth Management Co-TTEEs, 14,534 shares held of record by James R Scott's 401k, 35,240 shares held of record by James R and Christine M Scott Foundation, 1,901,036 shares held of record by JS Investments Limited Partnership, 346,563 shares held of record by Foundation for Community Vitality, 73,002 shares held of record by James F Heyneman Conservatorship, James Scott, Conservator, 31,879 shares held of record by James F Heyneman Trust, James Scott & First Interstate Wealth Management Co-Trustees, and 41,075 shares held of record by James R. Scott's spouse.

F4: Shares disposed of by James R. Scott Trust, James R Scott & First Interstate Wealth Managment Co-TTEEs's to Foundation for Community Vitality, and shares acquired by Foundation for Community Vitality from James R. Scott Trust, James R Scott & First Interstate Wealth Managment Co-TTEEs's, as a bona fide gift.