FIBK / First Interstate BancSystem, Inc. - Документы SEC, Годовой отчет, Доверенное заявление

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 29, 2025 FIRST INTERSTATE B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 29, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpora

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 13, 202

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K/A (Amendment No. 1) - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 13, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other juris

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 28, 2025 FIRST INTERSTATE B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 28, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpora

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 15, 2025 FIRST INTERSTATE B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 15, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpora

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 13, 2025 FIRST INTERSTATE B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 13, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpora

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2025 ☐ Transition report pursuant to S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2025 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE BANCS

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT AGREEMENT

Exhibit 10.2 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT AGREEMENT This Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, a Director of the Company. The Company and

First Interstate BancSystem, Inc. Reports Second Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Second Quarter Earnings Billings, MT - July 29, 2025 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the second quarter of 2025. For the quarter, the Company reported net income of $71.7 million, or $0.69 per diluted share, which compares to net income of $50.2 milli

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): July 29, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporati

Q2 2025 Investor Presentation Exhibit 99.2 July 29, 2025 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rul

Q2 2025 Investor Presentation Exhibit 99.2 July 29, 2025 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve i

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): July 3, 2025 FIRST INTERSTATE BANC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): July 3, 2025 FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporation or org

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 10, 2025 FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporation or or

Second Supplemental Indenture, dated June 10, 2025, between First Interstate BancSystem, Inc. and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee.

Exhibit 4.2 EXECUTION VERSION FIRST INTERSTATE BANCSYSTEM, INC. Issuer And U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION Trustee SECOND SUPPLEMENTAL INDENTURE Dated as of June 10, 2025 to the Indenture Dated as of May 15, 2020 7.625% Fixed-to-Floating Rate Subordinated Notes due 2035 TABLE OF CONTENTS Page ARTICLE I. SCOPE OF SUPPLEMENTAL INDENTURE 1 Section 1.01 Scope 1 ARTICLE II. DEFINITIONS 1

$125,000,000 7.625% Fixed-to-Floating Rate Subordinated Notes due 2035

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(5)   Registration No. 333-272215 PROSPECTUS SUPPLEMENT (to Prospectus dated May 26, 2023) $125,000,000 7.625% Fixed-to-Floating Rate Subordinated Notes due 2035 We are offering $125,000,000 aggregate principal amount of 7.625% Fixed-to-Floating Rate Subordinated Notes due 2035 (the “Notes”). The Notes will mature on June 15, 2035. From and including

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 FIRST INTERSTATE BANCSYSTEM INC Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to be Paid 1 Debt 7.

Underwriting Agreement, dated June 5, 2025, by and among First Interstate BancSystem, Inc., First Interstate Bank and Keefe, Bruyette & Woods, Inc.

Exhibit 1.1 $125,000,000 First Interstate BancSystem, Inc. 7.625% Fixed-to-Floating Rate Subordinated Notes due 2035 UNDERWRITING AGREEMENT June 5, 2025 Keefe, Bruyette & Woods, Inc. 787 Seventh Avenue, 4th Floor New York, New York 10019 As representative of the Underwriters listed in Schedule A hereto Ladies and Gentlemen: First Interstate BancSystem, Inc., a Delaware corporation (the “Company”),

First Interstate BancSystem, Inc. Announces Pricing of Subordinated Notes Offering

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Announces Pricing of Subordinated Notes Offering Billings, MT – June 5, 2025 – First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today announced the pricing of its public offering of $125 million aggregate principal amount of 7.625% Fixed-to-Floating Rate Subordinated Notes due 2035 (the “Notes”). The price to the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 5, 2025 FIRST INTERSTATE BANC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 5, 2025 FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporation or org

Subject to Completion, Dated June 5, 2025

TABLE OF CONTENTS The information in this preliminary prospectus supplement is not complete and may be changed.

Fixed Income Investor Presentation June 2025 2 SAFE HARBOR This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of th

Filed Pursuant to Rule 433 Issuer Free Writing Prospectus Dated June 5, 2025 Registration No.

7.625% Fixed-to-Floating Rate Subordinated Notes due 2035 Term Sheet

Free Writing Prospectus Filed pursuant to Rule 433 Supplementing the Preliminary Prospectus Supplement, dated June 5, 2025 Registration No.

EMPLOYMENT AGREEMENT

Exhibit 10.1 EMPLOYMENT AGREEMENT This Employment Agreement (this “Agreement”) is made effective as of June 1, 2025 (the “Effective Date”), by and between First Interstate BancSystem, Inc., a Delaware corporation (the “Company”), First Interstate Bank, a Montana bank (the “Bank”) and David Della Camera (“Executive”). The Company, Bank and Executive are sometimes collectively referred to herein as

Fixed Income Investor Presentation June 2025 Exhibit 99.1 2 SAFE HARBOR This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Sect

ex991fiip Fixed Income Investor Presentation June 2025 Exhibit 99.1 2 SAFE HARBOR This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, and Rule 3b-6 promulgated thereunder, that involve inherent

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 1, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 2, 2025 FIRST INTERSTATE BANC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 2, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporatio

David P. Della Camera Becomes CFO of First Interstate BancSystem, Inc.

Exhibit 99.1 David P. Della Camera Becomes CFO of First Interstate BancSystem, Inc. BILLINGS, MT – June 2, 2025 – First Interstate BancSystem, Inc. (NASDAQ: FIBK) (“First Interstate” or the “Company”) announced that effective June 1, 2025, David P. Della Camera has succeeded Marcy D. Mutch as the Company’s Executive Vice President and Chief Financial Officer (CFO). This transition completes the Co

AMENDED AND RESTATED BYLAWS FIRST INTERSTATE BANCSYSTEM, INC. (a Delaware corporation) TABLE OF CONTENTS

Exhibit 3.1 AMENDED AND RESTATED BYLAWS OF FIRST INTERSTATE BANCSYSTEM, INC. (a Delaware corporation) TABLE OF CONTENTS Page ARTICLE I - CORPORATE OFFICES 4 1.1 REGISTERED OFFICE 4 1.2 REGISTERED AGENT 4 1.3 OTHER OFFICES 4 ARTICLE II - MEETINGS OF STOCKHOLDERS 4 2.1 PLACE OF MEETINGS 4 2.2 ANNUAL MEETING 4 2.3 SPECIAL MEETING 4 2.4 ADVANCE NOTICE PROCEDURES 5 2.5 NOTICE OF STOCKHOLDERS’ MEETINGS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 20, 2025 FIRST INTERSTATE BANC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 20, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporatio

AMENDED AND RESTATED BYLAWS FIRST INTERSTATE BANCSYSTEM, INC. (a Delaware corporation) TABLE OF CONTENTS

Exhibit 3.2 AMENDED AND RESTATED BYLAWS OF FIRST INTERSTATE BANCSYSTEM, INC. (a Delaware corporation) TABLE OF CONTENTS Page ARTICLE I - CORPORATE OFFICES 4 1.1 REGISTERED OFFICE 4 1.2 REGISTERED AGENT 4 1.3 OTHER OFFICES 4 ARTICLE II - MEETINGS OF STOCKHOLDERS 4 2.1 PLACE OF MEETINGS 4 2.2 ANNUAL MEETING 4 2.3 SPECIAL MEETING 4 2.4 ADVANCE NOTICE PROCEDURES 5 2.5 NOTICE OF STOCKHOLDERS’ MEETINGS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1) Filed by the Registrant ☑ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2025 ☐ Transition report pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2025 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE BANC

First Interstate BancSystem, Inc. Reports First Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports First Quarter Earnings Billings, MT - April 29, 2025 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the first quarter of 2025. For the quarter, the Company reported net income of $50.2 million, or $0.49 per diluted share, which compares to net income of $52.1 millio

Q1 2025 Investor Presentation Exhibit 99.2 April 29, 2025 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Ru

Q1 2025 Investor Presentation Exhibit 99.2 April 29, 2025 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): April 29, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporat

Enterprise Bank & Trust to Expand in Arizona and Kansas through acquisition of Twelve Banking Offices from First Interstate Bank

EXHIBIT 99.1 Enterprise Bank & Trust to Expand in Arizona and Kansas through acquisition of Twelve Banking Offices from First Interstate Bank April 28, 2025, ST. LOUIS, MO. and BILLINGS, MT. — Enterprise Financial Services Corp (“Enterprise”) (NASDAQ: EFSC) and First Interstate BancSystem, Inc. (“First Interstate”) (NASDAQ: FIBK) have announced the signing of a purchase and assumption agreement by

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): April 28, 2025 FIRST INTERSTATE BA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): April 28, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporat

DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ____)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☑ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 14, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporat

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (Core ROATCE)

Exhibit 10.12 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (Core ROATCE) This Performance Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, an

Insider Trading Policy Effective November 2024

Exhibit 19 Insider Trading Policy Effective November 2024 1 Table of Contents 1 1 Overview 4 1.

Subsidiaries of First Interstate BancSystem, Inc.

Exhibit 21.1 Subsidiaries of First Interstate BancSystem, Inc. Subsidiary State of Incorporation or Jurisdiction of Organization Business Name First Interstate Bank Montana First Interstate Bank FI Statutory Trust I Connecticut FI Statutory Trust I FI Capital Trust II Delaware FI Capital Trust II FI Statutory Trust III Delaware FI Statutory Trust III FI Capital Trust IV Delaware FI Capital Trust I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10-K (Mark One) ☑ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2024 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission File Number: 001-34653 FIRST INTERST

Deferred Compensation Plan As Amended and Restated Effective February 15, 2025 IMPORTANT NOTE

Exhibit 10.2 Deferred Compensation Plan As Amended and Restated Effective February 15, 2025 IMPORTANT NOTE This document has not been approved by the Department of Labor, Internal Revenue Service, or any other governmental entity. An adopting Employer must determine whether the Plan is subject to the Federal securities laws and the securities laws of the various states. An adopting Employer may no

FIRST INTERSTATE BANCSYSTEM, INC. DIRECTOR COMPENSATION

Exhibit 10.14 FIRST INTERSTATE BANCSYSTEM, INC. DIRECTOR COMPENSATION We use a combination of cash and stock-based incentive compensation to attract and retain qualified candidates to serve on our Board of Directors (the “Board”). In setting director compensation, we consider the significant amount of time that directors expend in fulfilling their duties as well as the skill level required by us w

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): February 24, 2025 FIRST INTERSTATE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): February 24, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpo

TRANSITION AND SEPARATION AGREEMENT AND GENERAL RELEASE

Exhibit 10.1 TRANSITION AND SEPARATION AGREEMENT AND GENERAL RELEASE This Transition and Separation Agreement and General Release (the “Agreement”) is entered into by and among Marcy D. Mutch (“Employee”), First Interstate BancSystem, Inc. (the “Company”) and First Interstate Bank (the “Bank” and, together with the Company, “First Interstate”) with the Agreement to be effective as of February 24,

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): February 20, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpo

First Interstate BancSystem, Inc. Announces Chief Financial Officer Succession

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Announces Chief Financial Officer Succession Billings, Mont., February 25, 2025 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (“First Interstate” or the “Company”) announced today that Marcy D. Mutch notified the Company of her intention to retire as a full-time employee at the end of 2025 after more than 18 years of faithfu

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 29, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpor

4Q 2024 Investor Presentation Exhibit 99.2 January 29, 2025 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and

4Q 2024 Investor Presentation Exhibit 99.2 January 29, 2025 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involv

First Interstate BancSystem, Inc. Reports Fourth Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Fourth Quarter Earnings Billings, MT - January 29, 2025 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the fourth quarter of 2024. For the quarter, the Company reported net income of $52.1 million, or $0.50 per diluted share, which compares to net income of $55.5 mi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 3, 2025 FIRST INTERSTATE B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 3, 2025 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpora

FIRST AMENDMENT TO THE TRANSITION AND SEPARATION AGREEMENT AND GENERAL RELEASE

Exhibit 10.2 FIRST AMENDMENT TO THE TRANSITION AND SEPARATION AGREEMENT AND GENERAL RELEASE This First Amendment to the Transition and Separation Agreement and General Release, dated as of October 8, 2024 (this “Amendment”), is made and entered into by and among Kevin P. Riley (“Employee”), First Interstate BancSystem, Inc. (the “Company”) and First Interstate Bank (the “Bank” and, together with t

. UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2024 ☐ Transition report pursua

. UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2024 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTAT

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): October 24, 2024 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpor

First Interstate BancSystem, Inc. Reports Third Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Third Quarter Earnings Billings, MT - October 24, 2024 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the third quarter of 2024. For the quarter, the Company reported net income of $55.5 million, or $0.54 per share, which compares to net income of $60.0 million, or

3Q 2024 Investor Presentation Exhibit 99.2 October 24, 2024 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and

3Q 2024 Investor Presentation Exhibit 99.2 October 24, 2024 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involv

First Interstate BancSystem, Inc. Announces Appointment of James A. Reuter as President and CEO

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Announces Appointment of James A. Reuter as President and CEO Billings, Mont., October 19, 2024 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (“First Interstate or the “Company”) announced today the appointment of James (Jim) A. Reuter as President and Chief Executive Officer, effective November 1, 2024, replacing Kevin P. R

EMPLOYMENT AGREEMENT

Exhibit 10.1 EMPLOYMENT AGREEMENT This Employment Agreement (this “Agreement”) is made effective as of October 8, 2024 (the “Effective Date”), by and among First Interstate BancSystem, Inc., a Delaware corporation (the “Company”), First Interstate Bank, a Montana bank (the “Bank”) and James Reuter (“Executive”). The Company, Bank and Executive are sometimes collectively referred to herein as the “

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): October 9, 2024 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpora

TRANSITION AND SEPARATION AGREEMENT AND GENERAL RELEASE

Exhibit 10.3 TRANSITION AND SEPARATION AGREEMENT AND GENERAL RELEASE This Transition and Separation Agreement and General Release (the “Agreement”) is entered into by and among Kevin P. Riley (“Employee”), First Interstate BancSystem, Inc. (the “Company”) and First Interstate Bank (the “Bank” and, together with the Company, “First Interstate”) with the Agreement to be effective as of July 8, 2024

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2024 ☐ Transition report pursuant to S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2024 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE BANCS

First Interstate BancSystem, Inc. Reports Second Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Second Quarter Earnings Billings, MT - July 25, 2024 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the second quarter of 2024. For the quarter, the Company reported net income of $60.0 million, or $0.58 per share, which compares to net income of $58.4 million, or $

2Q 2024 Investor Presentation Exhibit 99.2 July 25, 2024 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rul

2Q 2024 Investor Presentation Exhibit 99.2 July 25, 2024 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve i

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): July 25, 2024 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporati

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): July 8, 2024 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporatio

First Interstate BancSystem, Inc. Announces President and CEO Kevin P. Riley’s Retirement

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Announces President and CEO Kevin P. Riley’s Retirement Billings, Mont., June 14, 2024 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (“First Interstate or the “Company”) announced today the upcoming retirement of President and Chief Executive Officer Kevin P. Riley and has initiated a search for his successor. Riley will con

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 14, 2024 FIRST INTERSTATE BAN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 14, 2024 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporati

Power of Attorney for each of the Reporting Persons

Exhibit 99.2 POWER OF ATTORNEY With respect to holdings of and transactions in securities issued by First Interstate BancSystem, a Montana corporation (the “Company”), each of the undersigned hereby constitutes and appoints Timothy Leuthold with full power of substitution and resubstitution, to act as each the undersigned’s true and lawful attorney-in-fact to: 1. execute for and on behalf of each

FIBK / First Interstate BancSystem, Inc. / Scott James R Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 22)* FIRST INTERSTATE BANCSYSTEM, INC. (Name of Issuer) Common Stock (Title of Class of Securities) 32055Y 201 (CUSIP Number) James R. Scott c/o First Interstate BancSystem, Inc. 401 North 31st Street Billings, Montana 59116 (406) 255-5390 (Name, Address and

Amended and Restated Joint Filing Agreement

EX-99.1 2 ex99-1.htm Exhibit 99.1 AMENDED AND RESTATED JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1) This Amended and Restated Joint Filing Agreement (this “Agreement”) is made pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), by and among the parties listed below, each referred to herein as a “Joint Filer.” Each Joint Filer agrees that

Calculation of Filing Fee Table Form S-8 (Form Type) FIRST INTERSTATE BANCSYSTEM, INC. (Exact Name of Registrant as Specified in its Charter) Table 1 - Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Ru

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) FIRST INTERSTATE BANCSYSTEM, INC.

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 20, 2024 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporatio

FIRST AMENDMENT TO FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN

Exhibit 99.2 FIRST AMENDMENT TO FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN This First Amendment (the “Amendment”) to the First Interstate BancSystem, Inc. 2023 Equity and Incentive Plan, as it may be amended, restated, or otherwise modified from time to time (the “Plan”), is hereby made effective as of this 21st day of May, 2024. Any capitalized terms used but not otherwise d

As filed with the Securities and Exchange Commission on May 23, 2024

As filed with the Securities and Exchange Commission on May 23, 2024 Registration No 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.2)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.2) Filed by the Registrant ☑ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2024 ☐ Transition report pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2024 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE BANC

FIRST INTERSTATE BANCSYSTEM, INC. (a Delaware corporation) TABLE OF CONTENTS

Exhibit 3.2 BYLAWS OF FIRST INTERSTATE BANCSYSTEM, INC. (a Delaware corporation) TABLE OF CONTENTS Page ARTICLE I - CORPORATE OFFICES 4 1.1 REGISTERED OFFICE 4 1.2 REGISTERED AGENT 4 1.3 OTHER OFFICES 4 ARTICLE II - MEETINGS OF STOCKHOLDERS 4 2.1 PLACE OF MEETINGS 4 2.2 ANNUAL MEETING 4 2.3 SPECIAL MEETING 4 2.4 ADVANCE NOTICE PROCEDURES 5 2.5 NOTICE OF STOCKHOLDERS’ MEETINGS 11 2.6 MANNER OF GIVI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.1) Filed by the Registrant ☑ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

First Interstate BancSystem, Inc. Reports First Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports First Quarter Earnings Billings, MT - April 24, 2024 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the first quarter of 2024. For the quarter, the Company reported net income of $58.4 million, or $0.57 per share, which compares to net income of $61.5 million, or $0

1Q 2024 Investor Presentation Exhibit 99.2 April 24, 2024 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Ru

1Q 2024 Investor Presentation Exhibit 99.2 April 24, 2024 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): April 24, 2024 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ____)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☑ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

FIBK / First Interstate BancSystem, Inc. / Scott James R Activist Investment

SC 13D/A 1 formsc13da.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 21)* FIRST INTERSTATE BANCSYSTEM, INC. (Name of Issuer) Common Stock (Title of Class of Securities) 32055Y 201 (CUSIP Number) James R. Scott c/o First Interstate BancSystem, Inc. 401 North 31st Street Billings, Montana 59116 (406) 2

SFFSG Committee Charter dated February 21, 2024

EX-99.5 2 ex99-5.htm Exhibit 99.5 Scott Family First Interstate BancSystem, Inc. (“FIBK”) Shareholders Group Committee Charter Adopted 2-21-20 | Revised 2.21.24 Rationale WHEREAS, the Scott Family (the “Family”) has a long history of ownership of FIBK, initially, as a private company, and, after FIBK went public in 2010, as a major shareholder of FIBK; and WHEREAS, the Family currently owns FIBK “

Director Nomination Agreement dated April 2, 2024

EX-99.7 3 ex99-7.htm Exhibit 99.7 EXECUTION VERSION [FIRST INTERSTATE LETTERHEAD] James R. Scott By E-mail: [email protected] April 2, 2024 Re: First Interstate Board of Directors Dear Jim: Further to our discussions relating to your continued service on the Board of Directors (the “Board”) of First Interstate Bancsystem, Inc. (the “Company”), this letter agreement sets forth the terms and condit

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): April 2, 2024 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporati

2

Exhibit 99.1 James R. Scott By E-mail: [email protected] April 2, 2024 Re: First Interstate Board of Directors Dear Jim: Further to our discussions relating to your continued service on the Board of Directors (the “Board”) of First Interstate Bancsystem, Inc. (the “Company”), this letter agreement sets forth the terms and conditions relating to that continued service on the Board. As you know, fo

Exhibit 4.1

Exhibit 4.1 DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT Description of Our Capital Stock The following is a description of material terms and provisions of the capital stock of First Interstate BancSystem, Inc. (the “Company”). The following summary does not purport to be complete, and is subject to, and qualified in its entirety by, the Certificate of Inco

EMPLOYMENT AGREEMENT

Exhibit 10.23 EMPLOYMENT AGREEMENT This Employment Agreement (this “Agreement”) is made effective as of January 23, 2024 (the “Effective Date”), by and between First Interstate BancSystem, Inc., a Delaware corporation (the “Company”), First Interstate Bank, a Montana bank (the “Bank”) and Kris Robbins (“Executive”). The Company, Bank and Executive are sometimes collectively referred to herein as t

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (Core ROAE)

Exhibit 10.16 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (Core ROAE) This Performance Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, an Em

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (Core ROAE)

Exhibit 10.14 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (Core ROAE) This Performance Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, an Em

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (TSR)

Exhibit 10.15 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (TSR) This Performance Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, an Employee

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT AGREEMENT

Exhibit 10.13 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT AGREEMENT This Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, an Employee of the Company. The Company a

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10-K (Mark One) ☑ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2023 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission File Number: 001-34653 FIRST INTERST

Clawback Policy Effective November 2023

Clawback Policy Effective November 2023 Table of Contents Clawback Policy 1 Table of Contents 2 1 Overview 3 1.

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (TSR)

Exhibit 10.17 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT (TSR) This Performance Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, an Employee

CODE OF ETHICS FOR CHIEF EXECUTIVE OFFICER AND SENIOR FINANCIAL OFFICERS OF FIRST INTERSTATE BANCSYSTEM, INC.

Exhibit 14.1 CODE OF ETHICS FOR CHIEF EXECUTIVE OFFICER AND SENIOR FINANCIAL OFFICERS OF FIRST INTERSTATE BANCSYSTEM, INC. This Code of Ethics of First Interstate BancSystem, Inc. (the “Company”), which is applicable only to the Company’s Chief Executive Officer (“CEO”) and senior financial officers, including the Company’s principal financial officer and principal accounting officer or controller

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT AGREEMENT

Exhibit 10.12 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT AGREEMENT This Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, an Employee of the Company. The Company a

FIRST INTERSTATE BANCSYSTEM, INC. DIRECTOR COMPENSATION

Exhibit 10.18 FIRST INTERSTATE BANCSYSTEM, INC. DIRECTOR COMPENSATION We use a combination of cash and stock-based incentive compensation to attract and retain qualified candidates to serve on our Board. In setting director compensation, we consider the significant amount of time that directors expend in fulfilling their duties as well as the skill level required by us with respect to members of t

FIBK / First Interstate BancSystem, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0940-firstinterstatebancsy.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: First Interstate BancSystem Inc Title of Class of Securities: Common Stock CUSIP Number: 32055Y201 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriat

First Interstate BancSystem, Inc. Reports Fourth Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Fourth Quarter Earnings Billings, MT - January 30, 2024 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the fourth quarter of 2023. For the quarter, the Company reported net income of $61.5 million, or $0.59 per share, which compares to net income of $72.7 million, o

FIBK / First Interstate BancSystem, Inc. / FRANKLIN MUTUAL ADVISERS LLC Passive Investment

firs23in.htm - Generated by SEC Publisher for SEC Filing CUSIP NO. 32055Y201 13G Page 1 of 7 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* FIRST INTERSTATE BANCSYSTEM, INC. (Name of Issuer) Common Stock, $0.00001 par value (Title of Class of Securities) 32055Y201 (CUSIP Number) December 31, 2023 (Dat

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 30, 2024 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpor

4Q 2023 Investor Presentation Exhibit 99.2 January 30, 2024 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and

4Q 2023 Investor Presentation Exhibit 99.2 January 30, 2024 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involv

FIBK / First Interstate BancSystem, Inc. / Scott James R Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 20)* FIRST INTERSTATE BANCSYSTEM, INC. (Name of Issuer) Common Stock (Title of Class of Securities) 32055Y 201 (CUSIP Number) James R. Scott c/o First Interstate BancSystem, Inc. 401 North 31st Street Billings, Montana 59116 (406) 255-5390 (Name, Address and

Repurchase Agreement dated December 14, 2023 (incorporated by reference to Exhibit 10.1 of the Issuer’s Current Report on Form 8-K filed with the SEC on December 14, 2023)

Exhibit 10.1 REPURCHASE AGREEMENT This REPURCHASE AGREEMENT (this “Agreement”) is made and entered into as of December 14, 2023 by and between First Interstate BancSystem, Inc., a Delaware corporation (the “Company”), and Homer Scott, Jr. Revocable Trust dated December 4, 1978, as amended and restated (“Stockholder”). RECITALS WHEREAS, Stockholder is the owner of record and beneficially of shares

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): December 14, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpo

EMPLOYMENT AGREEMENT

Exhibit 10.1 EMPLOYMENT AGREEMENT This Employment Agreement (this “Agreement”) is made effective as of November 30, 2023 (the “Effective Date”), by and between First Interstate BancSystem, Inc., a Delaware corporation (the “Company”), First Interstate Bank, a Montana bank (the “Bank”) and Lori Meyer (“Executive”). The Company, Bank and Executive are sometimes collectively referred to herein as the

Lori A. Meyer Named Chief Information Officer at First Interstate

Exhibit 99.1 For Immediate Release Lori A. Meyer Named Chief Information Officer at First Interstate Billings, Mont.—December 1, 2023—First Interstate BancSystem, Inc. (NASDAQ: FIBK) (“First Interstate” or the “Company”) has appointed Lori A. Meyer as Executive Vice President and Chief Information Officer (“CIO”). “Lori has been serving as interim CIO since the end of June and has demonstrated exc

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): November 30, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpo

Financial Statements and Exhibits, Changes in Registrant's Certifying Accountant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): November 28, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpo

November 30, 2023

RSM US LLP Exhibit 16.1 November 30, 2023 Securities and Exchange Commission Washington, D.C. 20549 Commissioners: We have read First Interstate BancSystem, Inc’s statements included under Item 4.01(a) of its Form 8-K filed on November 30, 2023, and we agree with such statements concerning our firm. Sincerely, /s/ RSM US LLP THE POWER OF BEING UNDERSTOOD AUDIT | TAX | CONSULTING RSM US LLP is the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2023 ☐ Transition report pursuant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2023 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): October 25, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpor

3Q 2023 Investor Presentation Exhibit 99.2 October 25, 2023 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and

3Q 2023 Investor Presentation Exhibit 99.2 October 25, 2023 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involv

First Interstate BancSystem, Inc. Reports Third Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Third Quarter Earnings Billings, MT - October 25, 2023 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the third quarter of 2023. For the quarter, the Company reported net income of $72.7 million, or $0.70 per share, which compares to net income of $67.0 million, or

EMPLOYMENT AGREEMENT

Exhibit 10.1 EMPLOYMENT AGREEMENT This Employment Agreement (this “Agreement”) is made effective as of August 24, 2023 (the “Effective Date”), by and between First Interstate BancSystem, Inc., a Delaware corporation (the “Company”), First Interstate Bank, a Montana bank (the “Bank”) and Lorrie Asker (“Executive”). The Company, Bank and Executive are sometimes collectively referred to herein as the

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 24, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorpora

Lorrie L. Asker Named Chief Banking Officer at First Interstate

Exhibit 99.1 For Immediate Release Lorrie L. Asker Named Chief Banking Officer at First Interstate Billings, Mont.—August 28, 2023—First Interstate BancSystem, Inc. (NASDAQ: FIBK) (“First Interstate” or the “Company”) has appointed Lorrie L. Asker as Executive Vice President and Chief Banking Officer (“CBO”). Asker has been serving as Interim CBO since February 2023. With a 30-year track record of

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2023 ☐ Transition report pursuant to S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2023 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE BANCS

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): July 26, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporati

2Q 2023 Investor Presentation Exhibit 99.2 July 26, 2023 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rul

2Q 2023 Investor Presentation Exhibit 99.2 July 26, 2023 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve i

First Interstate BancSystem, Inc. Reports Second Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Second Quarter Earnings Billings, MT - July 26, 2023 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) today reported financial results for the second quarter of 2023. For the quarter, the Company reported net income of $67.0 million, or $0.65 per share, which compares to net income of $56.3 million, or $0.54 per share,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 28, 2023 FIRST INTERSTATE BAN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): June 28, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporati

As filed with the Securities and Exchange Commission on May 25, 2023

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on May 25, 2023 Registration No.

Form of Senior Debt Securities (included in Exhibit 4.4).

Exhibit 4.4 FIRST INTERSTATE BANCSYSTEM, INC. Issuer And [TRUSTEE] Trustee INDENTURE Dated as of , 20 SENIOR DEBT SECURITIES CROSS-REFERENCE TABLE CERTAIN SECTIONS OF THIS INDENTURE RELATING TO SECTIONS 310 THROUGH 318, INCLUSIVE, OF THE TRUST INDENTURE ACT OF 1939 Trust Indenture Act Section Indenture Section §310(a)(1) 609 (a)(2) 609 (a)(3) Not Applicable (a)(4) Not Applicable (a)(5) 609 (b) 608

Calculation of Filing Fee Tables.

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) First Interstate BancSystem, Inc.

Form of Subordinated Debt Securities (included in Exhibit 4.5).

Exhibit 4.5 FIRST INTERSTATE BANCSYSTEM, INC. Issuer And [TRUSTEE] Trustee INDENTURE Dated as of , 20 SUBORDINATED DEBT SECURITIES CROSS-REFERENCE TABLE CERTAIN SECTIONS OF THIS INDENTURE RELATING TO SECTIONS 310 THROUGH 318, INCLUSIVE, OF THE TRUST INDENTURE ACT OF 1939 Trust Indenture Act Section Indenture Section §310(a)(1) 609 (a)(2) 609 (a)(3) Not Applicable (a)(4) Not Applicable (a)(5) 609 (

Calculation of Filing Fee Table Form S-8 (Form Type) FIRST INTERSTATE BANCSYSTEM, INC. (Exact Name of Registrant as Specified in its Charter) Table 1 - Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Ru

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) FIRST INTERSTATE BANCSYSTEM, INC.

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 24, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporatio

CERTIFICATE OF INCORPORATION FIRST INTERSTATE BANCSYSTEM, INC. Pursuant to Section 102 of the General Corporation Law of the State of Delaware

Exhibit 3.1 CERTIFICATE OF INCORPORATION OF FIRST INTERSTATE BANCSYSTEM, INC. Pursuant to Section 102 of the General Corporation Law of the State of Delaware I, the undersigned, for the purposes of incorporating and organizing a corporation under the General Corporation Law of the State of Delaware (the “DGCL”), do execute this Certificate of Incorporation and do hereby certify as follows: FIRST:

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT AGREEMENT

Exhibit 10.2 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT AGREEMENT This Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, an Employee of the Company. The Company an

Annual Shareholder’s Meeting May 24, 2023 Exhibit 99.1 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS 2 This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rul

a2022shmtgpres Annual Shareholder’s Meeting May 24, 2023 Exhibit 99.1 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS 2 This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder,

As filed with the Securities and Exchange Commission on May 25, 2023

As filed with the Securities and Exchange Commission on May 25, 2023 Registration No 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Form 8-A/A (Amendment No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 - FORM 8-A/A (Amendment No. 3) - FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact Name of Registrant as Specified in its Charter) - Delaware 81-0331430 (State or other jurisdiction of incorporation or organizatio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 24, 2023 FIRST INTERSTATE BANC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 24, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Delaware 001-34653 81-0331430 (State or other jurisdiction of incorporatio

PLAN OF DOMESTICATION AND CONVERSION FIRST INTERSTATE BANCSYSTEM, INC., A MONTANA CORPORATION, FIRST INTERSTATE BANCSYSTEM, INC., A DELAWARE CORPORATION

Exhibit 2.1 PLAN OF DOMESTICATION AND CONVERSION OF FIRST INTERSTATE BANCSYSTEM, INC., A MONTANA CORPORATION, TO FIRST INTERSTATE BANCSYSTEM, INC., A DELAWARE CORPORATION THIS PLAN OF DOMESTICATION AND CONVERSION, dated as of May 24, 2023 (this “Plan”), is hereby adopted by First Interstate BancSystem, Inc., a Montana corporation (the “Company”), in order to set forth the terms, conditions and pro

FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT

Exhibit 10.3 FIRST INTERSTATE BANCSYSTEM, INC. 2023 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK UNIT GRANT AGREEMENT This Performance Restricted Stock Unit Grant Agreement (“Agreement”) is made and entered into as of the date specified in Exhibit A (referred to as “Grant Date”) between First Interstate BancSystem, Inc. (the “Company”), and the below named Participant, an Employee of the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ____)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☑ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2023 ☐ Transition report pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2023 OR ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE BANC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ____)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☑ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

1Q 2023 Investor Presentation Exhibit 99.2 April 26, 2023 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Ru

mar2023ip 1Q 2023 Investor Presentation Exhibit 99.2 April 26, 2023 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, tha

First Interstate BancSystem, Inc. Reports First Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports First Quarter Earnings Billings, MT - April 26, 2023 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) today reported financial results for the first quarter of 2023. For the quarter, the Company reported net income of $56.3 million, or $0.54 per share, which compares to net income of $85.8 million, or $0.82 per share, f

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): April 26, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporati

Bylaws (incorporated by reference to Exhibit B of Appendix B to the Company’s definitive proxy statement on Schedule 14A filed with the SEC on April 11, 2023).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ____)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☑ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 10, 2023 FIRST INTERSTATE BA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 10, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporati

SECOND AMENDMENT TO THE FOURTH AMENDED AND RESTATED BYLAWS FIRST INTERSTATE BANCSYSTEM, INC.

Exhibit 3.1 SECOND AMENDMENT TO THE FOURTH AMENDED AND RESTATED BYLAWS OF FIRST INTERSTATE BANCSYSTEM, INC. This Second Amendment (“Amendment”) to the Fourth Amended and Restated Bylaws (the “Bylaws”) of First Interstate BancSystem, Inc., a Montana corporation (the “Corporation”), amends the Bylaws as follows: 1.Amended Section 2.12. Section 2.12 of Article II of the Bylaws is hereby amended to ad

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ____)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted b

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10-K (Mark One) ☑ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2022 or ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission File Number: 001-34653 FIRST INTERST

FIRST INTERSTATE BANCSYSTEM, INC. DIRECTOR COMPENSATION

Exhibit 10.9 FIRST INTERSTATE BANCSYSTEM, INC. DIRECTOR COMPENSATION We use a combination of cash and stock-based incentive compensation to attract and retain qualified candidates to serve on our Board. In setting director compensation, we consider the significant amount of time that directors expend in fulfilling their duties as well as the skill level required by us with respect to members of th

Subsidiaries of First Interstate BancSystem, Inc.

EX-21.1 3 fibk-20221231xex211subsid.htm EX-21.1 Exhibit 21.1 Subsidiaries of First Interstate BancSystem, Inc. Subsidiary State of Incorporation or Jurisdiction of Organization Business Name First Interstate Bank Montana First Interstate Bank FI Statutory Trust I Connecticut FI Statutory Trust I FI Capital Trust II Delaware FI Capital Trust II FI Statutory Trust III Delaware FI Statutory Trust III

FIBK / First Interstate Bancsystem Inc / FIRST INTERSTATE BANCSYSTEM INC - SC 13G/A Passive Investment

SC 13G/A 1 sc13ga20230214.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 18 Exit Filing)* - FIRST INTERSTATE BANCSYSTEM, INC. (Name of Issuer) Class A Common Stock (Title of Class of Securities) Class A Common Stock: 32055Y 201 (CUSIP Number) December 31, 2022 (Date of Event Which Requires

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): February 9, 2023 FIRST INTERSTATE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): February 9, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorpora

FIBK / First Interstate Bancsystem Inc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0915-firstinterstatebancsy.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)* Name of issuer: First Interstate BancSystem Inc. Class A Title of Class of Securities: Common Stock CUSIP Number: 32055Y201 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the a

FIBK / First Interstate Bancsystem Inc / MASSACHUSETTS FINANCIAL SERVICES CO /MA/ - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* FIRST INTERSTATE BANCSYSTEM INC (Name of Issuer) Common Stock (Title of Class of Securities) 32055Y201 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the approp

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 26, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorpora

4Q 2022 Investor Presentation Exhibit 99.2 January 26, 2023 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and

4Q 2022 Investor Presentation Exhibit 99.2 January 26, 2023 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involv

First Interstate BancSystem, Inc. Reports Fourth Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Fourth Quarter Earnings Billings, MT - January 26, 2023 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) today reported financial results for the fourth quarter of 2022. For the quarter, the Company reported net income of $85.8 million, or $0.82 per diluted share, which compares to net income of $85.7 million, or $0.80

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 11, 2023 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorpora

As filed with the Securities and Exchange Commission on January 09, 2023

S-8 POS 1 fibk-20220109xsx8pos.htm S-8 POS As filed with the Securities and Exchange Commission on January 09, 2023 Registration Nos 333-133837 333-193543 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 2 TO FROM S-8 REGISTRATION STATEMENT NO. 333-133837 POST-EFFECTIVE AMENDMENT NO. 1 TO FROM S-8 REGISTRATION STATEMENT NO. 333-193543 UNDER THE S

As filed with the Securities and Exchange Commission on January 09, 2023

S-8 POS 1 fibk-202201xxxsx8pos.htm S-8 POS As filed with the Securities and Exchange Commission on January 09, 2023 Registration Nos 333-133837 333-193543 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 2 TO FROM S-8 REGISTRATION STATEMENT NO. 333-133837 POST-EFFECTIVE AMENDMENT NO. 1 TO FROM S-8 REGISTRATION STATEMENT NO. 333-193543 UNDER THE S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2022 ☐ Transition report pursuant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2022 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE

First Interstate BancSystem, Inc. Reports Third Quarter Earnings and Announces a 14.6% Increase in the Quarterly Cash Dividend to $0.47 per Share

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Third Quarter Earnings and Announces a 14.6% Increase in the Quarterly Cash Dividend to $0.47 per Share Billings, MT - October 25, 2022 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) today reported financial results for the third quarter of 2022. For the quarter, the Company reported net income of $85.7 million, or $0

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): October 24, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorpora

3Q 2022 Investor Presentation Exhibit 99.2 October 25, 2022 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and

3Q 2022 Investor Presentation Exhibit 99.2 October 25, 2022 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains ?forward-looking statements? within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involv

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): October 3, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporat

Ashley Hayslip Joins First Interstate as Chief Banking Officer

Exhibit 99.1 For Immediate Release Ashley Hayslip Joins First Interstate as Chief Banking Officer Billings, Mont.?October 3, 2022?First Interstate BancSystem, Inc. (NASDAQ: FIBK) is pleased to announce that Ashley Hayslip has accepted her appointment, effective November 28, 2022, as Executive Vice President, Chief Banking Officer of First Interstate Bank. In her new role, Ms. Hayslip will lead Fir

CHANGE IN CONTROL SEPARATION AGREEMENT

Exhibit 10.1 CHANGE IN CONTROL SEPARATION AGREEMENT This Change in Control Separation Agreement (this ?Agreement?) is made effective as of May 30, 2022 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Kristina Robbins(?Executive?). The Company, Bank and Executive are sometimes col

CHANGE IN CONTROL SEPARATION AGREEMENT

Exhibit 10.2 CHANGE IN CONTROL SEPARATION AGREEMENT This Change in Control Separation Agreement (this ?Agreement?) is made effective as of May 30, 2022 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Gary Lorenz (?Executive?). The Company, Bank and Executive are sometimes collect

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2022 ☐ Transition report pursuant to S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2022 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE BANCS

2Q 2022 Investor Presentation Exhibit 99.2 July 26, 2022 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rul

2Q 2022 Investor Presentation Exhibit 99.2 July 26, 2022 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains ?forward-looking statements? within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve i

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): July 26, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporatio

First Interstate BancSystem, Inc. Reports Second Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Second Quarter Earnings Billings, MT - July 26, 2022 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) today reported financial results for the second quarter of 2022. For the quarter, the Company reported a net income of $64.1 million, or $0.59 per share, which compares to a net loss of $33.4 million, or $(0.36) per sha

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 000-49733 FIRST INTERSTATE BANCSYSTEM, INC. (Exact Name of Registrant as Sp

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-A/A (Amendment No. 2) FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES ACT OF 1934 FIRST INTERSTATE BANCSYSTEM, INC. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-A/A (Amendment No. 2) - FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES ACT OF 1934 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact Name of Registrant as Specified in its Charter) - Montana 81-0331430 (State or other jurisdiction of incorporation or organization) (IRS Emp

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 25, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporation

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 25, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporation

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2022 ☐ Transition report pursuant to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2022 OR ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to COMMISSION FILE NUMBER 001-34653 FIRST INTERSTATE BANC

Description of Securities (incorporated by reference to our Registration Statement on Form 8-A/A (Amendment No. 3), File No. 001-34653, filed on May 25, 2023.

Exhibit 4.1 DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT Description of Our Capital Stock Our articles of incorporation, as amended, provide for authorized shares of Class A common stock, Class B common stock, and preferred stock. There are no shares of Class B common stock or preferred stock currently outstanding. Our common stock is uncertificated. Our aut

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): April 28, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporati

1Q 2022 Investor Presentation Exhibit 99.2 April 28, 2022 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Ru

1Q 2022 Investor Presentation Exhibit 99.2 April 28, 2022 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains ?forward-looking statements? within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve

First Interstate BancSystem, Inc. Reports First Quarter Earnings

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports First Quarter Earnings Billings, MT - April 28, 2022 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) today reported financial results for the first quarter of 2022. For the quarter, the Company reported a net loss of $33.4 million, or $0.36 per share, which compares to net income of $51.1 million, or $0.83 per share, f

UNAUDITED PRO FORMA COMBINED CONDENSED CONSOLIDATED FINANCIAL INFORMATION

Exhibit 99.2 UNAUDITED PRO FORMA COMBINED CONDENSED CONSOLIDATED FINANCIAL INFORMATION On February 1, 2022 (the ?Closing Date?), First Interstate BancSystem, Inc., a Montana corporation (?First Interstate? or the ?Company?) completed its previously announced merger (the ?Merger?) with Great Western Bancorp, Inc., a Delaware corporation (?Great Western?), pursuant to the Agreement and Plan of Merge

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K/A Amendment No. 1 - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): February 1, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - MT 001-34653 81-0331430 (State or other jurisdiction

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ____)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted b

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ____)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted b

FIBK / First Interstate Bancsystem Inc / FIRST INTERSTATE BANCSYSTEM INC - FORM SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 - SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 19)* - FIRST INTERSTATE BANCSYSTEM, INC. (Name of Issuer) Class A Common Stock (Title of Class of Securities) 32055Y 201 (CUSIP Number) James R. Scott c/o First Interstate BancSystem, Inc. 401 North 31st Street Billings, Montana 59116 (406) 255-5390 (Name,

First Interstate BancSystem, Inc. Announces Effectiveness of Automatic Conversion of its Class B Common Stock into Class A Common Stock

Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Announces Effectiveness of Automatic Conversion of its Class B Common Stock into Class A Common Stock Billings, MT - March 25, 2022 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (?FIBK?), parent company of First Interstate Bank, announced today that all outstanding shares of its Class B common stock automatically converted i

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 25, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporati

Material Modification to Rights of Security Holders, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 25, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporati

FIRST INTERSTATE BANCSYSTEM, INC. 2015 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK GRANT AGREEMENT

Exhibit 99.2 FIRST INTERSTATE BANCSYSTEM, INC. 2015 EQUITY AND INCENTIVE PLAN PERFORMANCE RESTRICTED STOCK GRANT AGREEMENT This Restricted Stock Grant Agreement (?Agreement?) is made and entered into as of the date specified in Exhibit A (the ?Grant Date?) between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), and the below named Participant, an employee of the Company.

FIRST INTERSTATE BANCSYSTEM, INC. 2015 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK GRANT AGREEMENT

Exhibit 99.1 FIRST INTERSTATE BANCSYSTEM, INC. 2015 EQUITY AND INCENTIVE PLAN RESTRICTED STOCK GRANT AGREEMENT This Restricted Stock Grant Agreement (?Agreement?) is made and entered into as of the date specified in Exhibit A and referred to as (?Grant Date?) between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), and the below named Participant, an employee of the Compan

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 15, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorporati

EMPLOYMENT AGREEMENT

Exhibit 10.14 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of December 14, 2021 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Kirk Jensen (?Executive?). The Company, Bank and Executive are sometimes collectively referred to herein as th

EMPLOYMENT AGREEMENT

Exhibit 10.15 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of December 14, 2021 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Jodi Delahunt Hubbell (?Executive?). The Company, Bank and Executive are sometimes collectively referred to he

FIRST INTERSTATE BANCSYSTEM, INC. DIRECTOR COMPENSATION

Exhibit 10.11 FIRST INTERSTATE BANCSYSTEM, INC. DIRECTOR COMPENSATION We use a combination of cash and stock-based incentive compensation to attract and retain qualified candidates to serve on our Board. In setting director compensation, we consider the significant amount of time that directors expend in fulfilling their duties as well as the skill level required by us with respect to members of t

EMPLOYMENT AGREEMENT

Exhibit 10.17 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of February 1, 2022 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank? and, collectively with the Company, the ?Employer'? and Scott Erkonen (?Executive?). The Company, Bank and Executive

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10-K (Mark One) ? Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2021 or ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to . Commission File Number: 001-34653 FIRST INTERST

EMPLOYMENT AGREEMENT

Exhibit 10.18 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of February 1, 2022 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank? and, collectively with the Company, the ?Employer'? and Karlyn Knieriem (?Executive?). The Company, Bank and Executi

DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT

Exhibit 4.1 DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT Description of Our Capital Stock Our articles provide for Class A and Class B common stock. Class B common stock is convertible into Class A common stock as described below. Our common stock is uncertificated. Our authorized capital stock consists of 250,100,000 shares, each with no par value per share

EMPLOYMENT AGREEMENT

Exhibit 10.19 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of December 14, 2021 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Russell A. Lee (?Executive?). The Company, Bank and Executive are sometimes collectively referred to herein as

EMPLOYMENT AGREEMENT

Exhibit 10.13 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of December 14, 2021 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Marcy Mutch (?Executive?). The Company, Bank and Executive are sometimes collectively referred to herein as th

EMPLOYMENT AGREEMENT

Exhibit 10.16 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of December 14, 2021 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Phil Gaglia (?Executive?). The Company, Bank and Executive are sometimes collectively referred to herein as th

Subsidiaries of First Interstate BancSystem, Inc.

Exhibit 21.1 Subsidiaries of First Interstate BancSystem, Inc. Subsidiary State of Incorporation or Jurisdiction of Organization Business Name First Interstate Bank Montana First Interstate Bank FI Statutory Trust I Connecticut FI Statutory Trust I FI Capital Trust II Delaware FI Capital Trust II FI Statutory Trust III Delaware FI Statutory Trust III FI Capital Trust IV Delaware FI Capital Trust I

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): February 25, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorpor

FIBK / First Interstate Bancsystem Inc / MACQUARIE GROUP LTD - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* First Interstate BancSystem Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 32055Y201 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to

FIBK / First Interstate Bancsystem Inc / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)* Name of issuer: First Interstate BancSystem Inc. Class A Title of Class of Securities: Common Stock CUSIP Number: 32055Y201 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this

Scott Family First Interstate BancSystem, Inc. (“FIBK”) Shareholders Group Committee Charter Adopted 2-21-20 | Revised 2-1-22

Exhibit 99.5 Scott Family First Interstate BancSystem, Inc. (?FIBK?) Shareholders Group Committee Charter Adopted 2-21-20 | Revised 2-1-22 Rationale WHEREAS, the Scott Family (the ?Family?) has a long history of ownership of FIBK, initially, as a private company, and, after FIBK went public in 2010, as a major shareholder of FIBK; and WHEREAS, the Family currently owns high-vote FIBK ?B Common Sha

FORM OF VOTING AGREEMENT

Exhibit 99.4 FORM OF VOTING AGREEMENT February 1, 2022 First Interstate BancSystem, Inc. 401 North 31st Street Billings, MT 59101 Gentlemen: Reference is made to the Stockholders? Agreement, dated September 15, 2021 (as the same may be amended from time to time in accordance with its terms, the ?Stockholders? Agreement?), by and between the Stockholders (as defined in the Stockholders? Agreement)

FIBK / First Interstate Bancsystem Inc / FIRST INTERSTATE BANCSYSTEM INC - FORM SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 - SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 18)* - FIRST INTERSTATE BANCSYSTEM, INC. (Name of Issuer) Class A Common Stock (Title of Class of Securities) 32055Y 201 (CUSIP Number) James R. Scott c/o First Interstate BancSystem, Inc. 401 North 31st Street Billings, Montana 59116 (406) 255-5390 (Name,

POWER OF ATTORNEY

Exhibit 99.2 POWER OF ATTORNEY With respect to holdings of and transactions in securities issued by First Interstate BancSystem, a Montana corporation (the ?Company?), each of the undersigned hereby constitutes and appoints Timothy Leuthold with full power of substitution and resubstitution, to act as each the undersigned?s true and lawful attorney-in-fact to: 1. execute for and on behalf of each

FIBK / First Interstate Bancsystem Inc / MASSACHUSETTS FINANCIAL SERVICES CO /MA/ - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* FIRST INTERSTATE BANCSYSTEM INC (Name of Issuer) Common Stock (Title of Class of Securities) 32055Y201 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

FIBK / First Interstate Bancsystem Inc / FIRST INTERSTATE BANCSYSTEM INC - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 17)* - FIRST INTERSTATE BANCSYSTEM, INC. (Name of Issuer) Class A Common Stock and Class B Common Stock (Title of Class of Securities) Class A Common Stock: 32055Y 201; Class B Common Stock: 32055Y 300 (CUSIP Number) December 31, 2021 (Date of Event Which R

First Interstate BancSystem, Inc. Completes Merger with Great Western Bancorp, Inc.

Exhibit 99.1 First Interstate BancSystem, Inc. Completes Merger with Great Western Bancorp, Inc. BILLINGS, MT?Feb. 1, 2022? First Interstate BancSystem, Inc. (NASDAQ: FIBK) (?FIBK?), parent company of First Interstate Bank, announced that effective today, it has completed its previously announced merger with Great Western Bancorp, Inc. (?GWB?), parent company of Great Western Bank. The combined ho

Amendment to the Fourth Amended and Restated Bylaws of First Interstate BancSystem, Inc.

Exhibit 3.2 FIRST AMENDMENT TO THE FOURTH AMENDED AND RESTATED BYLAWS OF FIRST INTERSTATE BANCSYSTEM, INC. This First Amendment (?Amendment?) to the Fourth Amended and Restated Bylaws (the ?Bylaws?) of First Interstate BancSystem, Inc., a Montana corporation (the ?Corporation?), amends the Bylaws as follows: 1. New Section 3.15. Article III of the Bylaws is hereby amended to add the following new

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Completion of Acquisition or Disposition of Assets, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): February 1, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - MT 001-34653 81-0331430 (State or other jurisdiction of incorporation

Second Amendment to the Third Amended and Restated Articles of Incorporation of First Interstate.

EX-3.1 2 dp166234ex0301.htm EXHIBIT 3.1 Exhibit 3.1 SECOND AMENDMENT TO THE THIRD AMENDED AND RESTATED ARTICLES OF INCORPORATION OF FIRST INTERSTATE BANCSYSTEM, INC. Section 1 of Article IV of the Third Amended and Restated Articles of Incorporation of First Interstate BancSystem, Inc., a Montana corporation (the “Corporation”), is hereby amended and replaced in its entirety with the following: Se

First Interstate BancSystem, Inc. Reports Fourth Quarter Earnings

EX-99.1 2 fibk-20211231x8kpr.htm EX-99.1 Exhibit 99.1 Filed by First Interstate BancSystem, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Great Western Bancorp, Inc. Commission File No. 001-36688 Date: January 27, 2022 For Immediate Release First Interstate BancSystem, Inc. Reports Fourth Quarter Earnings Billings, MT - January 27, 2022 - First Interstate BancSystem,

First Interstate BancSystem Announces New Members of Executive Team

Exhibit 99.1 First Interstate BancSystem Announces New Members of Executive Team BILLINGS, MT ?January 27, 2022? First Interstate BancSystem, Inc. (NASDAQ: FIBK) (?FIBK?), parent company of First Interstate Bank, announced today that it expects Scott Erkonen and Karlyn Knieriem to join the FIBK executive team upon the closing of the previously announced merger of Great Western Bancorp, Inc. (?GWB?

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 27, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - MT 001-34653 81-0331430 (State or other jurisdiction of incorporation

Investor Presentation January 2022 Filed by First Interstate BancSystem, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Great Western Bancorp, Inc. Commission File No. 001-36688 Date: January 27, 2022 Exhibit 99.2 CAUTION

Investor Presentation January 2022 Filed by First Interstate BancSystem, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject Company: Great Western Bancorp, Inc. Commission File No. 001-36688 Date: January 27, 2022 Exhibit 99.2 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS Page 2 This presentation contains ?forward-looking statements? within the meaning of Section 27A of the

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 27, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - Montana 001-34653 81-0331430 (State or other jurisdiction of incorpora

First Interstate BancSystem and Great Western Bancorp Receive Final Regulatory and Shareholder Approvals to Merge

EX-99.1 6 dp165365ex9901.htm EXHIBIT 99.1 Exhibit 99.1 Thursday, January 20, 2022 First Interstate BancSystem and Great Western Bancorp Receive Final Regulatory and Shareholder Approvals to Merge BILLINGS, MT and Sioux Falls, SD—Jan. 20, 2022— First Interstate BancSystem, Inc. (NASDAQ: FIBK) (“FIBK”), parent company of First Interstate Bank, and Great Western Bancorp, Inc. (NYSE: GWB) (“GWB”), par

Articles of Amendment to Articles of Incorporation

Exhibit 3.1 FIRST AMENDMENT TO THE THIRD AMENDED AND RESTATED ARTICLES OF INCORPORATION OF FIRST INTERSTATE BANCSYSTEM, INC. 1. Board of Directors. Article VI of the Third Amended and Restated Articles of Incorporation of First Interstate BancSystem, Inc., a Montana corporation, is hereby amended to add the following new Section 6: Section 6. Except as otherwise provided for or fixed by or pursuan

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 20, 2022 (January 19, 2022) - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - MT 001-34653 81-0331430 (State or other jurisdicti

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 10, 2022 FIRST INTERSTATE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 10, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - MT 001-34653 81-0331430 (State or other jurisdiction of incorporation

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 - FORM 8-K - CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): January 10, 2022 - FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) - MT 001-34653 81-0331430 (State or other jurisdiction of incorporation

First Interstate BancSystem Receives Regulatory Approvals from the Federal Reserve System and Montana Division of Banking for Great Western Bancorp Merger

EX-99.1 2 dp164068ex9901.htm EXHIBIT 99.1 Exhibit 99.1 Thursday, December 22, 2021 First Interstate BancSystem Receives Regulatory Approvals from the Federal Reserve System and Montana Division of Banking for Great Western Bancorp Merger BILLINGS, MT and Sioux Falls, SD—Dec. 22, 2021— First Interstate BancSystem, Inc. (NASDAQ: FIBK) (“FIBK”), parent company of First Interstate Bank, and Great West

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): December 23, 2021 (December 22, 20

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): December 23, 2021 (December 22, 2021) FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) MT 001-34653 81-0331430 (State or other jurisdiction of i

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): December 23, 2021 (December 22, 2021) FIRST INTERSTATE BANCSYSTEM, INC. (Exact name of registrant as specified in its charter) MT 001-34653 81-0331430 (State or other jurisdiction of i

First Interstate BancSystem Receives Regulatory Approvals from the Federal Reserve System and Montana Division of Banking for Great Western Bancorp Merger

EX-99.1 2 dp164067ex9901.htm EXHIBIT 99.1 Exhibit 99.1 WLRK COMMENTS 12/22 Thursday, December 22, 2021 First Interstate BancSystem Receives Regulatory Approvals from the Federal Reserve System and Montana Division of Banking for Great Western Bancorp Merger BILLINGS, MT and Sioux Falls, SD—Dec. 22, 2021— First Interstate BancSystem, Inc. (NASDAQ: FIBK) (“FIBK”), parent company of First Interstate

MERGER PROPOSED-YOUR VOTE IS VERY IMPORTANT

TABLE OF CONTENTS Filed Pursuant to Rule 424(b)(3) Registration No. 333-260771 ? ? ? ? ? To the Shareholders of First Interstate BancSystem, Inc. and the Stockholders of Great Western Bancorp, Inc. MERGER PROPOSED-YOUR VOTE IS VERY IMPORTANT On behalf of the boards of directors of First Interstate BancSystem, Inc. (?First Interstate?) and Great Western Bancorp, Inc. (?Great Western?), we are pleas

EX-99.1

Exhibit 99.1

EX-99.2

Exhibit 99.2

CONSENT OF PIPER SANDLER & CO.

EX-99.5 11 ny20001148x2ex99-5.htm EXHIBIT 99.5 Exhibit 99.5 1251 AVENUE OF THE AMERICAS, 6TH FLOOR NEW YORK, NY 10020 P 212 466-7800 | TF 800 635-6851 Piper Sandler & Co. Since 1885. Member SIPC and NYSE. CONSENT OF PIPER SANDLER & CO. We hereby consent to the inclusion of our opinion letter to the Board of Directors of Great Western Bancorp, Inc. (the “Company”) as an Annex to the Joint Proxy Sta

CONSENT OF BARCLAYS CAPITAL INC.

Exhibit 99.4 745 Seventh Avenue New York, NY 10019 United States December 14, 2021 CONSENT OF BARCLAYS CAPITAL INC. We hereby consent to (i) the inclusion of our opinion letter, dated September 15, 2021, to the Board of Directors of First Interstate BancSystem, Inc. (the ?Company?), as an Annex D to the joint prospectus/proxy statement that forms a part of Amendment No. 1 to the Registration State

CONSENT OF KEEFE, BRUYETTE & WOODS, INC.

EX-99.3 9 ny20001148x2ex99-3.htm EXHIBIT 99.3 Exhibit 99.3 CONSENT OF KEEFE, BRUYETTE & WOODS, INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of First Interstate BancSystem, Inc. (“First Interstate”), as Annex C to the Joint Proxy Statement/Prospectus which forms a part of Amendment No. 1 to the Registration Statement on Form S-4 (file No. 333-260771) filed

Agreement and Plan of Merger, dated as of September 15, 2021, by and between First Interstate BancSystem, Inc. and Great Western Bancorp, Inc. (incorporated herein by reference to Exhibit 2.1 to the Company’s Registration Statement on Form S-4, filed with the Commission on December 14, 2021)

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on December 14, 2021 Registration No.

[Signature Page Follows]

December 14, 2021 VIA EDGAR Eric Envall Division of Corporation Finance Office of Finance Securities and Exchange Commission 100 F Street, N.

CONSENT OF PIPER SANDLER & CO.

EX-99.5 6 ny20001148x1ex99-5.htm EXHIBIT 99.5 Exhibit 99.5 1251 AVENUE OF THE AMERICAS, 6TH FLOOR NEW YORK, NY 10020 P 212 466-7800 | TF 800 635-6851 Piper Sandler & Co. Since 1885. Member SIPC and NYSE. CONSENT OF PIPER SANDLER & CO. We hereby consent to the inclusion of our opinion letter to the Board of Directors of Great Western Bancorp, Inc. (the “Company”) as an Annex to the Joint Proxy Stat

CONSENT OF BARCLAYS CAPITAL INC.

EX-99.4 5 ny20001148x1ex99-4.htm EXHIBIT 99.4 Exhibit 99.4 745 Seventh Avenue New York, NY 10019 United States November 4, 2021 CONSENT OF BARCLAYS CAPITAL INC. We hereby consent to (i) the inclusion of our opinion letter, dated September 15, 2021, to the Board of Directors of First Interstate BancSystem, Inc. (the “Company”), as an Annex D to the joint prospectus/proxy statement that forms a part

EMPLOYMENT AGREEMENT

Exhibit 10.6 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of August 19, 2021 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Kirk Jensen (?Executive?). The Company, Bank and Executive are sometimes collectively referred to herein as the ?

EMPLOYMENT AGREEMENT

Exhibit 10.5 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of August 19, 2021 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Kade Peterson (?Executive?). The Company, Bank and Executive are sometimes collectively referred to herein as the

CONSENT OF KEEFE, BRUYETTE & WOODS, INC.

EX-99.3 4 ny20001148x1ex99-3.htm EXHIBIT 99.3 Exhibit 99.3 CONSENT OF KEEFE, BRUYETTE & WOODS, INC. We hereby consent to the inclusion of our opinion letter to the Board of Directors of First Interstate BancSystem, Inc. (“First Interstate”), as Annex C to the Joint Proxy Statement/Prospectus which forms a part of the Registration Statement on Form S-4 filed on the date hereof (the “Registration St

EMPLOYMENT AGREEMENT

Exhibit 10.7 EMPLOYMENT AGREEMENT This Employment Agreement (this ?Agreement?) is made effective as of August 19, 2021 (the ?Effective Date?), by and between First Interstate BancSystem, Inc., a Montana corporation (the ?Company?), First Interstate Bank, a Montana bank (the ?Bank?) and Phil Gaglia (?Executive?). The Company, Bank and Executive are sometimes collectively referred to herein as the ?

AMENDMENT 2021-1 TO THE FIRST INTERSTATE BANCSYSTEM, INC. DEFERRED COMPENSATION PLAN

Exhibit 10.10 AMENDMENT 2021-1 TO THE FIRST INTERSTATE BANCSYSTEM, INC. DEFERRED COMPENSATION PLAN A.Section 9.8 of the First Interstate BancSystem, Inc. Deferred Compensation Plan, restated effective January 1, 2016 (the ?Plan?) gives First Interstate BancSystem, Inc. (the ?Plan Sponsor?) the right to amend the Plan at any time. B.On July 26, 2006, the Board of Directors of the Plan Sponsor deleg