# EDGAR Filing Document

**Accession Number:** 0000860413
**File Stem:** 0000860413-26-000048
**Filing Date:** 2026-5
**Character Count:** 11725
**Document Hash:** 3385930b70d371cabde873d3a00888b1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000860413-26-000048.hdr.sgml**: 20260529

**ACCESSION NUMBER**: 0000860413-26-000048

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 12

**CONFORMED PERIOD OF REPORT**: 20260527

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

**ITEM INFORMATION**: Submission of Matters to a Vote of Security Holders

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260529

**DATE AS OF CHANGE**: 20260529

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIRST INTERSTATE BANCSYSTEM INC
- **CENTRAL INDEX KEY:** 0000860413
- **STANDARD INDUSTRIAL CLASSIFICATION:** STATE COMMERCIAL BANKS [6022]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 810331430
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34653
- **FILM NUMBER:** 261044908

**BUSINESS ADDRESS:**
- **STREET 1:** 401 NO 31ST STREET
- **CITY:** BILLINGS
- **STATE:** MT
- **ZIP:** 59101
- **BUSINESS PHONE:** 4062555311

**MAIL ADDRESS:**
- **STREET 1:** 401 NO 31ST STREET
- **CITY:** BILLINGS
- **STATE:** MT
- **ZIP:** 59101

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIRST INTERSTATE BANCSYSTEM OF MONTANA INC
- **DATE OF NAME CHANGE:** 19930615

?xml version='1.0' encoding='ASCII'? fibk-20260527

**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 27, 2026** 

**------------------------------** 

**FIRST INTERSTATE BANCSYSTEM, INC.** 

**(Exact name of registrant as specified in its charter)**

**------------------------------** 

---

| | | | |
|:---|:---|:---|:---|
| **Delaware** | **Delaware** | **001-34653** | **81-0331430** |
| (State or other jurisdiction of<br>incorporation or organization) | (State or other jurisdiction of<br>incorporation or organization) | (Commission<br>File No.) | (IRS Employer<br>Identification No.) |
| **401 North 31st Street** | **401 North 31st Street** |  |  |
| **Billings,** | **MT** |  | **59101** |
| (Address of principal executive offices) | (Address of principal executive offices) |  | (zip code) |

---

---

| | |
|:---|:---|
| **(406)** | **255-5311** |
| (Registrant's telephone number, including area code) | (Registrant's telephone number, including area code) |
| **Not Applicable** | **Not Applicable** |
| (Former name or former address, if changed since last report) | (Former name or former address, if changed since last report) |

---

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (<u>see</u> General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a- 12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

\* \* \* \* \*

**Securities registered pursuant to Section 12(b) of the Act:**

---

| | | |
|:---|:---|:---|
| **<u>Title of each class</u>** | **<u>Trading Symbol(s)</u>** | **<u>Name of exchange on which registered</u>** |
| Common stock, $0.00001 par value | FIBK | NASDAQ |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

&nbsp;&nbsp;&nbsp;&nbsp;Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

\* \* \* \* \*

------

**Item 5.02** Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Pursuant to the director retirement policy set forth in the Corporate Governance Guidelines of First Interstate BancSystem, Inc. (the "Company"), on May 27, 2026, each of Ms. Patricia L. Moss and Messrs. David L. Jahnke and Stephen M. Lacy, each having reached the retirement age of 72, was deemed to have retired and resigned automatically from the Company's Board of Directors (the "Board") as a Class II, Class III and Class I director, respectively, effective immediately prior to the Company's 2026 annual meeting of shareholders (the "2026 Annual Meeting"). None of the retirements was related to any disagreement with the Company on any matter relating to the Company's operations, policies, or practices. The Company thanks Ms. Moss and Messrs. Jahnke and Lacy for their years of dedicated service and many contributions to the Company and wishes them each well in retirement.

In connection with the retirements described above, the Company reduced the size of the Board from 14 to 11 directors and correspondingly reduced the number of directors in each class of the Board to eliminate any vacancy that otherwise would have resulted from the retirements.

**Item 5.03** Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

As described in Item 5.07 below, at the 2026 Annual Meeting, the Company's shareholders approved an amendment to the Company's Certificate of Incorporation (the "Charter Amendment") to implement in conjunction with the Company's Amended and Restated Bylaws (the "Bylaws") a plurality voting standard with respect to the election of directors in the event of a contested election of directors, as defined in the Bylaws. A majority vote standard will continue to apply for the election of directors in an uncontested election. On May 28, 2026, the Company filed the Charter Amendment with the Secretary of State of Delaware, at which time the Charter Amendment became effective.

The foregoing description of the Charter Amendment is qualified in its entirety by reference to, and should be read in conjunction with, the complete text of the Charter Amendment, a copy of which is filed as Exhibit 3.1 to this Current Report on Form 8-K and is incorporated herein by reference.

**Item 5.07** Submission of Matters to a Vote of Security Holders.

At the 2026 Annual Meeting held on May 27, 2026, the proposals voted upon and the final voting results for each proposal are as follows:

**Proposal No. 1 -** To elect as Class II directors the following nominees proposed by the Board to three-year terms expiring at the 2029 annual meeting of shareholders of the Company, or until their respective successors have been elected and qualified or until such person's earlier death, resignation or removal.

---

| | | | | |
|:---|:---|:---|:---|:---|
| Name of Nominee | For | Against | Abstentions | Broker Non-Votes |
| Alice S. Cho | 69585766 | 948445 | 3491502 | 5725652 |
| Dennis L. Johnson | 69589375 | 944689 | 3491649 | 5725652 |
| Daniel A. Rykhus | 66325640 | 4209058 | 3491015 | 5725652 |

---

**Proposal No. 2 -** To approve the Charter Amendment.

---

| | | | |
|:---|:---|:---|:---|
| For | Against | Abstentions | Broker Non-Votes |
| 72,701,511 | 1,281,015 | 43,187 | 5,725,652 |

---

**Proposal No. 3 -** To approve, on a non-binding, advisory basis, the compensation of the Company's named executive officers.

---

| | | | |
|:---|:---|:---|:---|
| For | Against | Abstentions | Broker Non-Votes |
| 68,855,208 | 5,062,682 | 107,823 | 5,725,652 |

---

------

**Proposal No. 4 -** To ratify the appointment of Ernst & Young LLP as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2026.

---

| | | | |
|:---|:---|:---|:---|
| For | Against | Abstentions | Broker Non-Votes |
| 79,488,279 | 233,150 | 29,936 |  |

---

**Item 9.01** Financial Statements and Exhibits.

(d) Exhibits.

---

| | |
|:---|:---|
| **Exhibit No.** | **Exhibit Description** |
| <u>[3.1](fibk-20260529xex31_certxof.htm)</u> | Certificate of Amendment to the Certificate of Incorporation of First Interstate BancSystem, Inc. |
| 104 | Cover Page Interactive Data File (embedded within Inline XBRL document). |

---

------

**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: May 29, 2026

---

| | |
|:---|:---|
| **FIRST INTERSTATE BANCSYSTEM, INC.** | **FIRST INTERSTATE BANCSYSTEM, INC.** |
| By: | /s/ JAMES A. REUTER |
|  | James A. Reuter |
|  | President and Chief Executive Officer |

---

## Exhibit 3.1

**Exhibit 3.1** 

**CERTIFICATE OF AMENDMENT** 

**TO THE CERTIFICATE OF INCORPORATION**

**OF**

**FIRST INTERSTATE BANCSYSTEM, INC.**

**a Delaware corporation**

Pursuant to Section 242 of the General Corporation Law of the State of Delaware (the "**DGCL**"), First Interstate BancSystem, Inc., a corporation organized and existing under the DGCL (the "**Corporation**"), hereby certifies as follows:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A.On February 24, 2026, the Board of Directors of the Corporation duly adopted resolutions setting forth and declaring advisable the following amendment (the "**Amendment**") to the Corporation's Certificate of Incorporation (the "**Certificate**") and directing that the Amendment be submitted to the shareholders of the Corporation for approval at the Corporation's 2026 Annual Meeting of Shareholders.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.Section (d) of Article SEVENTH of the Certificate is hereby amended and restated in its entirety to read as follows:

"(d) Except as may otherwise be set forth in the Bylaws of the Corporation with respect to plurality voting in the event of a contested election (as such term is defined or used in the Bylaws) of directors, directors shall be elected by a majority of the voting power of the shares of capital stock present in person or represented by proxy at an annual meeting of shareholders and entitled to vote on the election of directors. There shall be no cumulative voting for directors of the Corporation."

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.This Amendment to the Certificate has been duly adopted by the requisite vote of the shareholders of the Corporation at a meeting of shareholders duly called and held, in accordance with Section 242 of the DGCL.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.This Amendment to the Certificate shall become effective upon filing with the Secretary of State of the State of Delaware.

------

**IN WITNESS WHEREOF**, the Corporation has caused this Certificate of Amendment to the Certificate of Incorporation to be signed by a duly authorized officer of the Corporation on this 28<sup>th</sup> day of May, 2026.

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| | |
|:---|:---|
| By: | /s/ Kirk D. Jensen |
|  | Name: Kirk D. Jensen<br>Title: Executive Vice President and General Counsel |

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