Sec Form 4 Filing - SCOTT JULIE A @ FIRST INTERSTATE BANCSYSTEM INC - 2022-03-02

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person SCOTT JULIE A 2. Issuer Name and Ticker or Trading Symbol FIRST INTERSTATE BANCSYSTEM INC [ FIBK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 31 BUSBEE ROAD, 3. Date of Earliest Transaction (MM/DD/YY) 03/02/2022 (Street) ASHEVILLE, NC28803 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 03/02/2022 C 25,700 A 573,956( 2 ) I see footnote( 3 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Class B Common Stock $ 0( 1 ) 03/02/2022 C 25,700 ( 1 ) ( 1 ) Class A Common Stock 25,700 $ 0 2,363,457 I see footnote( 4 ) Class B Common Stock $ 0( 1 ) ( 1 ) ( 1 ) Class A Common Stock 1,933 1,933 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other SCOTT JULIE A 31 BUSBEE ROAD ASHEVILLE, NC28803 X Exempt Thomas W Scott Marital Trust 2 FIRST INTERSTATE BANK, TRUSTEE P.O. BOX 2007 SHERIDAN, WY82801 X SCOTT THOMAS W FIRST INTERSTATE BANK, TRUSTEE P.O. BOX 2007 SHERIDAN, WY82801 X Thomas W Scott Trust Dtd 8/22/95, Thomas W Scott Trustee FIRST INTERSTATE BANK, TRUSTEE P.O. BOX 2007 SHERIDAN, WY82801 X Signatures THOMAS W SCOTT TRUST DTD 8/22/95, THOMAS W SCOTT TRUSTEE, By: ** 03/04/2022 Signature of Reporting Person Date EXEMPT THOMAS W SCOTT MARITAL TRUST 2, By: ** 03/04/2022 Signature of Reporting Person Date THOMAS W SCOTT, By: ** 03/04/2022 Signature of Reporting Person Date Julie Scott Rose, By ** 03/04/2022 Signature of Reporting Person Date **By: /s/ Timothy Leuthold, Attorney-in-Fact 03/04/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )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. ( 2 )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 Julie A Scott. ( 3 )Composed of 131,731 shares held of record by Juliana Sarah Scott Rose Trust, 131,731 shares held of record by Elizabeth Lauren Scott Rose Trust, 94,863 shares held of record by Holland Elizabeth Scott Trust, 94,863 shares held of record by Harper Grace Scott Trust, 94,863 shares held of record by Harrison William Scott Trust, 25,700 shares held of record by IXL Limited Liability Company, and 205 shares held of record by the estate of Thomas W Scott. ( 4 )Composed of 397,210 shares held of record by Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002, 10,424 shares held of record by First Interstate Bank & Julie Scott Rose, Co-TTEEs of the Joan D Scott Trust Dtd 10/16/12, 196,828 shares held of record by IXL Limited Liability Company, 1,669,660 shares held of record by Thomas W Scott Trust Dtd 8/22/95, Thomas W Scott Trustee, and 89,335 shares held of record by Exempt Thomas W Scott Marital Trust 2.

Remarks: Form 2 of 2

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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