X0206 3 2022-02-01 0 0000860413 FIRST INTERSTATE BANCSYSTEM INC FIBK 0001198533 SCOTT JAMES R PO BOX 7113 BILLINGS MT 59103 1 0 1 0 0001908712 James R Scott Trust, James R Scott & First Interstate Wealth Management Co-TTEEs PO BOX 7113 BILLINGS MT 59103 0 0 1 0 0001909853 James R & Christine M Scott Foundation PO BOX 7113 BILLINGS MT 59103 0 0 1 0 0001908658 JS Investments Limited Partnership PO BOX 7113 BILLINGS MT 59103 0 0 1 0 0001908742 Foundation for Community Vitality PO BOX 7113 BILLINGS MT 59103 0 0 1 0 0001908854 James F Heyneman Conservatorship, James Scott, Conservator PO BOX 7113 BILLINGS MT 59103 0 0 1 0 0001908844 James F Heyneman Trust, James Scott & First Interstate Wealth Management Co-Trustees PO BOX 30918 BILLINGS MT 59116 0 0 1 0 Class A Common Stock 82492 I See footnote Class B Common Stock 0.00 Class A Common Stock 4311477 I See footnote 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 James R. Scott. Composed of 35,723 shares held of record by James R Scott Trust, James R Scott & First Interstate Wealth Management Co-TTEEs, 28,839 shares held of record by James R Scott, and 17,930 shares held of record by Foundation for Community Vitality. The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire. Composed of 1,972,462 shares held of record by James R Scott Trust, James R Scott & First Interstate Wealth Management Co-TTEEs, 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, 322,641 shares held of record by Foundation for Community Vitality, 73,002 shares held of record by James F Heyneman Conservatorship, James Scott, Conservator, and 7,096 shares held of record by James F Heyneman Trust, James Scott & First Interstate Wealth Management Co-Trustees. Exhibit 24 - Power of Attorney JAMES R. SCOTT, By: /s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person 2022-02-10 JAMES R SCOTT TRUST, JAMES R SCOTT & FIRST INTERSTATE WEALTH MANAGEMENT CO-TTEES, By: /s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person 2022-02-10 JAMES R AND CHRISTINE M SCOTT FOUNDATION, By: /s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person 2022-02-10 JS INVESTMENTS LIMITED PARTNERSHIP, By: /s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person 2022-02-10 FOUNDATION FOR COMMUNITY VITALITY, By: /s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person 2022-02-10 JAMES F HEYNEMAN CONSERVATORSHIP, JAMES SCOTT, CONSERVATOR, By: /s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person 2022-02-10 JAMES F HEYNEMAN TRUST, JAMES SCOTT & FIRST INTERSTATE WEALTH MANAGEMENT CO-TRUSTEES, By: /s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person 2022-02-10