# EDGAR Filing Document

**Accession Number:** 0000860413
**File Stem:** 0001628280-26-038071
**Filing Date:** 2026-5
**Character Count:** 145202
**Document Hash:** c7392cb0f684a26e9d23b6b3dd4bebf7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-26-038071.hdr.sgml**: 20260622

**ACCESSION NUMBER**: 0001628280-26-038071

**CONFORMED SUBMISSION TYPE**: S-3ASR

**PUBLIC DOCUMENT COUNT**: 19

**FILED AS OF DATE**: 20260526

**DATE AS OF CHANGE**: 20260526

**EFFECTIVENESS DATE**: 20260526

**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:** S-3ASR
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-296234
- **FILM NUMBER:** 261019781

**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

**As filed with the Securities and Exchange Commission on May 26, 2026**

**Registration No. 333-&nbsp;&nbsp;&nbsp;&nbsp;** 

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549**

**Form S-3** 

**REGISTRATION STATEMENT UNDER** 

**THE SECURITIES ACT OF 1933**

**First Interstate BancSystem, Inc.** 

(Exact name of registrant as specified in its charter)

---

| | |
|:---|:---|
| **Delaware** <br>(State or other jurisdiction of incorporation or organization)  | **81-0331430** <br>(I.R.S. Employer Identification Number)  |

---

**401 North 31st Street** 

**Billings, Montana 59101** 

**(406) 255-5311** 

(Address, including zip code and telephone number, including area code, of registrant's principal executive offices)

**David P. Della Camera**

**Executive Vice President and Chief Financial Officer** 

**401 North 31st Street** 

**Billings, Montana 59101** 

**(406) 255-5311**

(Name, address, including zip code and telephone number, including area code, of agent for service)

***Copies to:***

**Scott A. Berdan, Esq.** 

**Tyler L. Weigel, Esq.**

**Polsinelli PC** 

**1401 Lawrence Street, Suite 2300** 

**Denver, CO 80202** 

**(303) 572-9300** 

**Approximate date of commencement of proposed sale to the public:** From time to time after this Registration Statement becomes effective.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☒

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer", "accelerated filer", "smaller reporting company", and "emerging growth company" in Rule 12b-2 of the Exchange Act.

---

| | | | |
|:---|:---|:---|:---|
| Large accelerated filer  | ☒  | Accelerated filer  | ☐ |
| Non-accelerated filer  | ☐  | Smaller reporting company  | ☐ |
|  |  | 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 7(a)(2)(B) of the Securities Act. ☐

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**PROSPECTUS** 

![firstinterstatebancsystemla.jpg](firstinterstatebancsystemla.jpg)

**Common Stock** 

**Preferred Stock** 

**Depositary Shares** 

**Debt Securities** 

**Warrants** 

**Purchase Contracts** 

**Units** 

**of** 

**FIRST INTERSTATE BANCSYSTEM, INC.** 

First Interstate BancSystem, Inc. from time to time may offer to sell the securities identified above in one or more offerings. This prospectus describes some of the general terms that may apply to these securities and the general manner in which they may be offered. The specific terms of any securities to be offered, and the specific manner in which they may be offered, will be described in an applicable prospectus supplement to this prospectus.

Our common stock, $0.00001 par value per share ("Common Stock"), is listed for trading on the Nasdaq Global Select Market ("NASDAQ") under the ticker symbol "FIBK". Unless otherwise indicated in the applicable prospectus supplement, none of the securities offered hereby, other than our Common Stock, will be listed on any securities exchange.

**This prospectus may not be used to sell securities unless accompanied by an applicable prospectus supplement. Investing in our securities involves risks. You should carefully read this prospectus and any applicable prospectus supplement, together with the documents incorporated by reference, before you make your investment decision. See "<u>[Risk Factors](#i273a1fae35aa4b78bf18a953d719f68b_202)</u>" on page <u>[5](#i273a1fae35aa4b78bf18a953d719f68b_202)</u> of this prospectus, as well as any additional risk factors included in, or incorporated by reference into, any applicable prospectus supplement, to read about factors you should consider before buying any of our securities.** 

**None of the Securities and Exchange Commission, any state securities commission, the Board of Governors of the Federal Reserve System, the Federal Deposit Insurance Corporation (the "FDIC"), the Montana Division of Banking and Financial Institutions, or any other regulatory body has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.** 

**The securities are not savings accounts, deposits or other obligations and will not be insured by the FDIC or any other governmental agency or instrumentality, and they are not obligations of, or guaranteed by, our bank or any of our non-bank subsidiaries.** 

We may offer and sell the securities directly, through one or more agents, dealers or underwriters as designated from time to time, or through a combination of these methods.

**Prospectus dated May 26, 2026.**

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**TABLE OF CONTENTS** 

---

| | |
|:---|:---|
|  | **Page**  |
| <u>[ABOUT THIS PROSPECTUS](#i273a1fae35aa4b78bf18a953d719f68b_135)</u> | <u>[1](#i273a1fae35aa4b78bf18a953d719f68b_135)</u> |
| <u>[CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION](#i273a1fae35aa4b78bf18a953d719f68b_153)</u> | <u>[2](#i273a1fae35aa4b78bf18a953d719f68b_153)</u> |
| <u>[WHERE YOU CAN FIND MORE INFORMATION](#i273a1fae35aa4b78bf18a953d719f68b_170)</u> | <u>[4](#i273a1fae35aa4b78bf18a953d719f68b_170)</u> |
| <u>[ABOUT THE CORPORATION](#i273a1fae35aa4b78bf18a953d719f68b_186)</u> | <u>[5](#i273a1fae35aa4b78bf18a953d719f68b_186)</u> |
| <u>[RISK FACTORS](#i273a1fae35aa4b78bf18a953d719f68b_202)</u> | <u>[5](#i273a1fae35aa4b78bf18a953d719f68b_202)</u> |
| <u>[USE OF PROCEEDS](#i273a1fae35aa4b78bf18a953d719f68b_453)</u> | <u>[5](#i273a1fae35aa4b78bf18a953d719f68b_453)</u> |
| <u>[PLAN OF DISTRIBUTION](#i273a1fae35aa4b78bf18a953d719f68b_219)</u> | <u>[6](#i273a1fae35aa4b78bf18a953d719f68b_219)</u> |
| <u>[DESCRIPTION](#iae76b4e6b8ac4681921ad32d18f2b634_44378)[OF THE SECURITIES WE MAY OFFER](#iae76b4e6b8ac4681921ad32d18f2b634_44378)</u>  | <u>[7](#i273a1fae35aa4b78bf18a953d719f68b_235)</u> |
| <u>[VALIDITY OF THE SECURITIES](#i273a1fae35aa4b78bf18a953d719f68b_251)</u> | <u>[9](#i273a1fae35aa4b78bf18a953d719f68b_251)</u> |
| <u>[EXPERTS](#i273a1fae35aa4b78bf18a953d719f68b_267)</u> | <u>[9](#i273a1fae35aa4b78bf18a953d719f68b_267)</u> |

---

**You should rely only on the information contained in or incorporated by reference into this prospectus and any applicable prospectus supplement. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not making an offer to sell securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus, any applicable prospectus supplement and the documents incorporated by reference herein and therein is accurate only as of their respective dates. Our business, financial condition, results of operations and prospects may have changed since those dates.** 

i

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**ABOUT THIS PROSPECTUS** 

This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission (the "SEC") as a "well-known seasoned issuer" as defined in Rule 405 under the Securities Act of 1933, as amended (the "Securities Act"), using an automatic "shelf" registration process. This prospectus does not contain all information included in the registration statement. Under this shelf registration process, we may offer and sell the securities identified in this prospectus in one or more offerings.

Each time we offer and sell securities, we will provide a prospectus supplement along with this prospectus that will contain specific information about the terms of the offering and the securities being offered and, if necessary, a pricing supplement that will contain the specific terms of your securities. The prospectus supplement and, if necessary, the pricing supplement, may also add, update or change information contained in this prospectus. Any information contained in this prospectus will be deemed to be modified or superseded by any inconsistent information contained in a prospectus supplement or a pricing supplement. You should read carefully this prospectus and any prospectus supplement and pricing supplement, together with the additional information described below under the caption "Where You Can Find More Information".

We may also prepare free writing prospectuses that describe particular securities. Any free writing prospectus should also be read in connection with this prospectus and with any prospectus supplement referred to therein. For purposes of this prospectus, any reference to an applicable prospectus supplement may also refer to a free writing prospectus, unless the context otherwise requires.

The registration statement that contains this prospectus, including the exhibits to the registration statement, contains additional information about us and the securities offered under this prospectus. The registration statement can be obtained from the SEC's website, www.sec.gov.

The distribution of this prospectus and any applicable prospectus supplement and the offering of the securities in certain jurisdictions may be restricted by law. Persons into whose possession this prospectus and any applicable prospectus supplement come should inform themselves about and observe any such restrictions. This prospectus and any applicable prospectus supplement do not constitute, and may not be used in connection with, an offer or solicitation by anyone in any jurisdiction in which such offer or solicitation is not authorized or in which the person making such offer or solicitation is not qualified to do so or to any person to whom it is unlawful to make such offer or solicitation.

In this prospectus, references to the "Corporation", "FIBK", "we", "us", "our" or similar references refer solely to First Interstate BancSystem, Inc. and not First Interstate BancSystem, Inc. together with any of its subsidiaries, unless the context indicates otherwise.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION** 

This prospectus contains or incorporates by reference, and from time to time our management may make, forward-looking statements within the meaning of the safe harbor provisions of the United States, or U.S., Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and Rule 3b-6 promulgated thereunder, that involve inherent risks and uncertainties. In some cases, you can identify these statements by forward-looking words such as "may", "might", "will", "would", "should", "could", "expects", "intends", "plans", "anticipates", "believes", "estimates", "predicts", "trends", "objectives", "projected", "potential" or "continues", the negative of these terms and other comparable terminology. These forward-looking statements, which are subject to risks, uncertainties and assumptions (some of which are beyond our control and ability to predict), may include projections of FIBK's future financial performance, financial condition, results of operations, investment portfolio, market position, expenses, or events, or anticipated growth strategies, descriptions of new business initiatives and anticipated trends in FIBK's business or financial results. These statements are not guarantees of future performance and are only predictions based on our current expectations and projections about future events. Factors that could cause FIBK's actual financial condition and results of operations, level of activity, performance or achievements to differ materially from those indicated by such forward-looking statements include, but are not limited to:

**Regulatory and Compliance Risks, including:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• new or changes in existing governmental regulations or in the way such regulations are interpreted or enforced;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• negative developments in the banking industry and increased regulatory scrutiny;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• tax legislative initiatives or assessments;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• more stringent capital requirements, to the extent they may become applicable to us;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• changes in accounting standards;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• any failure to comply with applicable laws and regulations, including, but not limited to, the Community Reinvestment Act and fair lending laws, the USA PATRIOT ACT, Office of Foreign Assets Control guidelines and requirements, the Bank Secrecy Act, and the related Financial Crimes Enforcement Network and Federal Financial Institutions Examination Council's guidelines and regulations; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• federal deposit insurance assessment rate increases;

**Credit Risks, including:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• lending risks and risks associated with loan portfolio concentrations;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• a decline in economic conditions that could reduce demand for our products and services and negatively impact the credit quality of loans;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• credit losses on loans exceeding estimates;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• potential effects on the U.S. economy resulting from the implementation of governmental policies, including tax regulations and changes to United States trade policies, including the imposition of tariffs and retaliatory tariffs and geopolitical uncertainty; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the soundness of other financial institutions;

**Liquidity Risks, including:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the ability to meet cash flow needs and availability of financing sources for working capital and other needs;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• a loss of deposits or a change in product mix that increases our funding costs; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• inability to access funding or to monetize liquid assets;

**Market Risks, including:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• changes in interest rates; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• interest rate effect on the value of our investment securities;

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**Operational Risks, including:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• cybersecurity risks, including business disruptions from denial-of-service attacks, network intrusions, business e-mail compromise, and other malicious behavior that could result in the disclosure of confidential information;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• privacy, information security, and data protection laws, rules, and regulations that affect or limit how we collect and use personal information or otherwise have an adverse effect on us;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the potential impairment of our goodwill and other intangible assets;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• our reliance on third parties that provide key components of our business infrastructure;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• events that may tarnish our reputation;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• mainstream and social media contagion;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the loss of the services of key members of our management team and directors;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• our ability to attract and retain qualified employees to operate our business;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• costs associated with repossessed properties, including potential environmental remediation;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the effectiveness of our operational processes, policies and procedures, and internal control over financial reporting;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• our ability to implement technology-facilitated products and services or be successful in marketing these products and services to our clients; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the development and use of artificial intelligence;

**Strategic Risks, including:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• risks related to acquisitions, mergers, strategic partnerships, divestitures, and other transactions;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• competition from new or existing financial institutions and non-banks;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• investing in technology; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• incurrence of significant costs related to mergers and related integration activities;

**Common Stock Risks, including:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the volatility in the price and trading volume of our Common Stock;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• "anti-takeover" provisions in our certificate of incorporation ("Charter") and amended and restated bylaws ("Bylaws"), which may make it more difficult for a third party to acquire control of us even in circumstances that could be deemed beneficial to stockholders;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• changes in our dividend policy or our ability to pay dividends;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the possibility that we may fail to realize the anticipated benefits of our stock repurchase program;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• our Common Stock not being an insured deposit;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the potential dilutive effect of future equity issuances; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the subordination of our Common Stock to our existing and future indebtedness;

**General Risk Factors, including:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the effect of global conditions, earthquakes, volcanoes, tsunamis, floods, fires, drought, and other natural catastrophic events; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the impact of climate change and environmental sustainability matters.

These and other factors are more fully described under "Risk Factors" in Item 1A of our most recent Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the SEC on February 26, 2026, as such factors may be updated from time to time in our periodic filings with the SEC, as well as the other information contained or incorporated by reference in this prospectus or in any prospectus supplement hereto. Forward-looking statements speak only as of the date on which such statements are made. Except as required by law, FIBK undertakes no obligation to update any forward-looking statement to reflect events or circumstances after the date on which such statement is made, or to reflect the occurrence of unanticipated events. If we update one or more forward-looking statements, no inference should be drawn that we will make additional updates with respect to those or other forward-looking statements.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**WHERE YOU CAN FIND MORE INFORMATION** 

We file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC maintains an internet website that contains reports, proxy statements and other information about issuers, like FIBK, that file electronically with the SEC. The address of that website is http://www.sec.gov. FIBK's internet website address is http://www.fibk.com. We make available, through our website, our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and any amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. The references to the SEC's website and our website are for the convenience of investors as required by the SEC and shall not be deemed to incorporate any information on these websites into this prospectus. All website addresses in this prospectus are intended to be inactive textual references only.

In this prospectus, as permitted by law, we "incorporate by reference" information from other documents that we file with the SEC. This means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be a part of this prospectus and should be read with the same care. When we file documents with the SEC in the future that are incorporated or deemed to be incorporated by reference in this prospectus, the information contained in this prospectus and previously incorporated by reference in this prospectus is considered to be automatically updated and superseded to the extent that information in such later-filed documents modifies or supersedes such information. Any information so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus. In case of a conflict or inconsistency between information contained in this prospectus or previously incorporated by reference into this prospectus and information that we file later and incorporate by reference into this prospectus, you should rely on the information contained in the document that was filed later.

We incorporate by reference the documents and information listed below and any documents we file with the SEC in the future (File No. 001-34653) under Section 13(a), 13(c), 14, or 15(d) of the Exchange Act until the completion of the offering of securities under this prospectus (other than, in each case, information in such additional documents that is deemed, under the Exchange Act, in accordance with the Exchange Act and SEC rules, to be "furnished" and not filed with the SEC):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Annual Report on <u>[Form 10-K](https://www.sec.gov/Archives/edgar/data/860413/000086041326000011/fibk-20251231.htm)</u> for the year ended December 31, 2025, filed with the SEC on February 26, 2026;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•The portions of our definitive Proxy Statement on Schedule 14A for our 2026 Annual Meeting of Shareholders, filed with the SEC on <u>[April](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000025/fibk-20260415.htm)[16](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000025/fibk-20260415.htm)[, 202](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000025/fibk-20260415.htm)[6](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000025/fibk-20260415.htm)</u>, that are incorporated by reference into Part III of our Annual Report on Form 10-K for the year ended December 31, 2025;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Quarterly Report on <u>[Form 10-Q](https://www.sec.gov/Archives/edgar/data/860413/000086041326000038/fibk-20260331.htm)</u> for the quarter ended March 31, 2026, filed with the SEC on May 7, 2026;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•Current Reports on Form 8-K, filed with the SEC on <u>[January](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000007/fibk-20260128.htm)[28](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000007/fibk-20260128.htm)[, 202](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000007/fibk-20260128.htm)[6](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000007/fibk-20260128.htm)</u>, <u>[April 29, 2026](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000034/fibk-20260429.htm)</u>, and <u>[May 13, 2026](https://www.sec.gov/ix?doc=/Archives/edgar/data/0000860413/000086041326000041/fibk-20260511.htm)</u>; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•The description of our Common Stock included in our Registration Statement on Form 8-A/A (Amendment No. 3), filed with the SEC on <u>[May 25, 2023](https://www.sec.gov/Archives/edgar/data/860413/000086041323000117/form8-aa20230525.htm)</u>, as updated by <u>[Exhibit 4.1](https://www.sec.gov/Archives/edgar/data/860413/000086041324000016/fibk-20231231xex41_descxse.htm)</u>to our Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on February 29, 2024, including any other amendment or reports filed for the purpose of updating such description.

You may request a copy of any of these filings, other than an exhibit to a filing unless that exhibit is specifically incorporated by reference into that filing, at no cost, by writing to or telephoning us at the following address:

First Interstate BancSystem, Inc.

401 North 31st Street

Billings, Montana 59101

Attention: Corporate Secretary

(406) 255-5311

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**ABOUT THE CORPORATION** 

We are a financial and bank holding company focused on community banking. Since our incorporation in Montana in 1971, we have grown both organically and through strategic acquisitions. In May 2023, pursuant to a Plan of Domestication and conversion approved by shareholders, we changed our corporate domicile from the state of Montana to the state of Delaware. As of May 26, 2026, we operate 273 banking offices, including branches and detached drive-up facilities, in communities across ten states — Colorado, Idaho, Iowa, Missouri, Montana, Nebraska, Oregon, South Dakota, Washington, and Wyoming. Through our bank subsidiary, First Interstate Bank, we deliver a comprehensive range of banking products and services — including online and mobile banking — to individuals, businesses, government entities, and others throughout our market areas. We are proud to provide financial services and products to clients that participate in a wide variety of industries, including agriculture, construction, education, governmental services, healthcare, hospitality, housing, professional services, real estate development, retail, technology, tourism and wholesale trade.

Our principal business activity is lending to, accepting deposits from, and conducting financial transactions for individuals, businesses, governmental entities, and other entities located in the communities we serve. We derive our income principally from interest charged on loans and, to a lesser extent, from interest and dividends earned on fixed income investments. We also derive income from non-interest sources such as: (i) fees received in connection with various lending and deposit services; (ii) wealth management services, such as trust, employee benefit, investment, and insurance services; (iii) mortgage loan originations, sales, and servicing; (iv) merchant and electronic banking services; and (v) from time to time, gains on sales of assets and securities. As of December 31, 2025, we had one significant subsidiary, First Interstate Bank.

Our principal executive offices are located at 401 North 31st Street, Billings, Montana 59101, and our telephone number is (406) 255-5311. Our Common Stock is listed on the Nasdaq Global Select Market under the ticker symbol "FIBK". Our website address is www.FIBK.com. This website address is not intended to be an active link and information on our website is not incorporated in, and should not be construed to be part of, this prospectus.

**RISK FACTORS** 

Investing in our securities involves risks. Before you invest in any of our securities, in addition to the other information included in, or incorporated by reference into, this prospectus, you should carefully consider the risk factors contained in Item 1A under the caption "Risk Factors" and elsewhere in our most recent <u>[Annual Report on Form 10-K filed with the SEC for the fiscal year ended December 31, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/860413/000086041326000011/fibk-20251231.htm#i5e67aaf452b94531acb4f5c2b666ccb4_37)</u>, as updated by our annual or quarterly reports for subsequent fiscal years or fiscal quarters that we file with the SEC and that are so incorporated. See "Where You Can Find More Information" for information about how to obtain a copy of these documents. You should also carefully consider the risks and other information that may be contained in, or incorporated by reference into, any prospectus supplement relating to specific offerings of securities.

**USE OF PROCEEDS** 

We intend to use the net proceeds from the sale of any securities offered under this prospectus for general corporate purposes, unless otherwise specified in the applicable prospectus supplement or pricing supplement relating to a specific issue of securities. Our general corporate purposes may include refinancing activities, repurchasing shares of our Common Stock, acquisitions of other companies and such other purposes indicated in the applicable prospectus supplement and, if necessary, the applicable pricing supplement. The precise amounts and timing of our use of the net proceeds will depend upon our, and our subsidiaries', funding requirements and the availability of other funds.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**PLAN OF DISTRIBUTION** 

We may use this prospectus to offer securities from time to time in one or more offerings. The applicable prospectus supplement will describe the amounts, prices and detailed terms of the securities and may describe risks associated with an investment in the securities. We will also include in the prospectus supplement, where applicable, information about material U.S. federal income tax considerations relating to the securities. Terms used in this prospectus will have the meanings described in this prospectus unless otherwise specified.

We may offer and sell all or a portion of the securities covered by this prospectus from time to time, together or separately, in one or more or any combination of the following transactions: (i) on NASDAQ, in the over-the-counter market or on any other national securities exchange on which our securities are listed or traded; (ii) in privately negotiated transactions; (iii) in underwritten transactions; (iv) in a block trade in which a broker-dealer will attempt to sell the offered securities as agent but may purchase and resell a portion of the block as principal to facilitate the transaction; (v) through purchases by a broker-dealer as principal and resale by the broker-dealer for its account pursuant to this prospectus; (vi) in ordinary brokerage transactions and transactions in which the broker solicits purchasers; (vii) "at the market" or through market makers or into an existing market for the securities; and (viii) through any other method permitted by applicable law.

We may sell the securities at prices then prevailing, related to the then-prevailing market price or at negotiated prices. The offering price of the securities from time to time will be determined by us, and, at the time of the determination, may be higher or lower than the market price of our securities on NASDAQ or any other exchange or market.

Securities may be sold directly or through broker-dealers acting as principal or agent, or pursuant to a distribution by one or more underwriters on a firm commitment or best-efforts basis. We may also enter into hedging transactions with broker-dealers. In connection with such transactions, broker-dealers or other financial institutions may engage in short sales of our securities in the course of hedging the positions they assume with us.

In connection with an underwritten offering, underwriters or agents may receive compensation in the form of discounts, concessions or commissions from us or from purchasers of the offered securities for whom they may act as agents. In addition, underwriters may sell the securities to or through dealers, and those dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and/or commissions from the purchasers for whom they may act as agents. Any underwriters, dealers or agents participating in a distribution of the securities may be deemed to be "underwriters" within the meaning of the Securities Act, and any commissions received by broker-dealers may be deemed to be underwriting commissions under the Securities Act.

To facilitate the offering of securities covered by this prospectus, certain persons participating in the offering may engage in transactions that stabilize, maintain or otherwise affect the price of our securities. This may include over-allotments or short sales of our securities, which involve the sale by persons participating in the offering of more securities than we sold to them. In these circumstances, these persons would cover such over-allotments or short positions by making purchases in the open market or by exercising their over-allotment option, if any. In addition, these persons may stabilize or maintain the price of our securities by bidding for or purchasing our securities in the open market or by imposing penalty bids, whereby selling concessions allowed to dealers participating in the offering may be reclaimed if securities sold by them are repurchased in connection with stabilization transactions. The effect of these transactions may be to stabilize or maintain the market price of our securities at a level above that which might otherwise prevail in the open market. These transactions may be discontinued at any time.

We may agree to indemnify an underwriter, broker-dealer or agent against certain liabilities related to the sale of the securities, including liabilities under the Securities Act.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

At the time we enter any material arrangement with an underwriter or broker-dealer for the sale of securities through a block trade, special offering, exchange distribution, secondary distribution or a purchase by an underwriter or broker-dealer, we will file a supplement to this prospectus, if required, pursuant to Rule 424(b) under the Securities Act, disclosing certain material information, including:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• the number of securities being offered;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•the terms of the offering;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•the names of the participating underwriters, broker-dealers or agents;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•any discounts, commissions or other compensation paid to underwriters or broker-dealers and any discounts, commissions or concessions allowed or reallowed or paid by any underwriters to dealers;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•the public offering price; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;•other material terms of the offering.

To the extent required, this prospectus may be amended and/or supplemented from time to time to describe a specific plan of distribution.

In the ordinary course of their business activities, any underwriter, broker-dealer or agent and their respective affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers and may at any time hold long and short positions in such securities and instruments. Such investment and securities activities may involve our securities and other instruments. Any underwriter, broker-dealer or agent and their respective affiliates may also engage in transactions with or perform services for us or provide other types of financing to us in the ordinary course of their business.

**DESCRIPTION OF THE SECURITIES WE MAY OFFER** 

This prospectus may not be used to sell securities unless accompanied by the applicable prospectus supplement.

**Common Stock** 

Our Charter provides that we are authorized to issue up to 150,000,000 shares of Common Stock. We may sell shares of our Common Stock pursuant to this prospectus. In a prospectus supplement, we will describe the aggregate number of shares offered and the offering price or prices of the shares. Each share of outstanding Common Stock entitles the holder to one vote per share. Our Common Stock is not convertible into any other shares of our capital stock and is uncertificated.

**Preferred Stock; Depositary Shares** 

Our board of directors is authorized under our Charter, without approval of the holders of Common Stock, to provide for the issuance of up to 100,000 shares of preferred stock, $0.00001 par value per share, from time to time in one or more series in such number and with such designations, preferences, powers and other special rights as may be stated in the resolution or resolutions providing for such preferred stock. In a prospectus supplement, we will describe the specific designation, the aggregate number of shares offered, the dividend rate or manner of calculating the dividend rate, the dividend periods or manner of calculating the dividend periods, the ranking of the shares of the series with respect to dividends, liquidation and dissolution, the liquidation preference of the shares of the series, the voting rights of the shares of the series, if any, whether and on what terms the shares of the series will be convertible or exchangeable, whether and on what terms we can redeem the shares of the series, whether we will offer depositary shares representing shares of the series and if so, the fraction or multiple of a share of preferred stock represented by each depositary share, whether we will list the preferred stock or depositary shares on a securities exchange and any other specific terms of the series of preferred stock.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**Debt Securities — Senior Debt Securities and Subordinated Debt Securities** 

We may sell debt securities, including senior debt securities and subordinated debt securities, which may be senior or subordinated in priority of payment. We will provide a prospectus supplement that describes the ranking, whether senior or subordinated, the level of seniority or subordination (as applicable), the specific designation, the aggregate principal amount, the purchase price, the maturity, the redemption terms, the interest rate or manner of calculating the interest rate, the time of payment of interest, if any, the terms for any conversion or exchange, including the terms relating to the adjustment of any conversion or exchange mechanism, the listing, if any, on a securities exchange and any other specific terms of any debt securities that we may issue from time to time.

Our debt securities will be governed by one or more indentures that are qualified under the Trust Indenture Act of 1939, as amended (the "Trust Indenture Act"). Senior debt securities will be issued in one or more series under a senior debt securities indenture, to be entered into between us and a trustee, substantially in the form included as an exhibit to the registration statement of which this prospectus is a part, which we refer to as the "senior debt securities indenture". Subordinated debt securities will be issued in one or more series under the Indenture, dated as of May 15, 2020, between us and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee, which we refer to as the "subordinated debt securities indenture". We refer to the senior debt securities indenture and the subordinated debt securities indenture together as the "indentures".

The indentures may be supplemented or modified from time to time. Specific terms and conditions for debt securities to be issued under the applicable indenture will be set forth or determined as provided in the applicable indenture, including, as applicable, in a supplemental indenture, officers' certificate, company order or other instrument establishing the terms of a particular series, and will be described in the applicable prospectus supplement.

The subordinated debt securities will be our unsecured subordinated obligations and will be subordinate in right of payment to our senior indebtedness to the extent and in the manner stated in the subordinated debt securities indenture, as supplemented or modified for the applicable series. The applicable prospectus supplement will describe the specific subordination provisions, and any additions to or modifications of those provisions, for the series of subordinated debt securities being offered.

**Warrants** 

We may sell warrants to purchase our debt securities, shares of preferred stock or shares of our Common Stock. In a prospectus supplement, we will inform you of the exercise price and other specific terms of the warrants, including whether our or your obligations, if any, under any warrants may be satisfied by delivering or purchasing the underlying securities or their cash value.

**Purchase Contracts** 

We may issue purchase contracts, including contracts obligating holders to purchase from, or to sell to, us, and obligating us to sell to, or to purchase from, the holders, a specified number of shares of our Common Stock, preferred stock or depositary shares at a future date or dates. The price per share of Common Stock, preferred stock or depositary shares and the number of shares of each may be fixed at the time the purchase contracts are issued or may be determined by reference to a specific formula set forth in the purchase contracts. The applicable prospectus supplement will describe the terms of the purchase contracts, including, if applicable, collateral or depositary arrangements.

**Units** 

We may issue units consisting of one or more purchase contracts and beneficial interests in any of our securities described in the applicable prospectus supplement, securing the holders' obligations to purchase the Common Stock, preferred stock or depositary shares under the purchase contracts. The applicable prospectus supplement will describe the terms of the units, including, if applicable, collateral or depositary arrangements.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**VALIDITY OF THE SECURITIES** 

Unless otherwise indicated in the applicable prospectus supplement, the validity of the securities offered by this prospectus will be passed upon for us by Polsinelli PC, Denver, Colorado. Additional legal matters may be passed upon for us or any underwriters, dealers, or agents by counsel that we will name in the applicable prospectus supplement. If the securities are being distributed in an underwritten offering, the validity of the securities will be passed upon for the underwriters by counsel identified in the applicable prospectus supplement.

**EXPERTS** 

The consolidated financial statements of First Interstate BancSystem, Inc. at December 31, 2025 and 2024 appearing in First Interstate BancSystem, Inc.'s Annual Report (Form 10-K) for the year ended December 31, 2025, and the effectiveness of First Interstate BancSystem, Inc.'s internal control over financial reporting as of December 31, 2025 have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon, included therein, and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such reports given on the authority of such firm as experts in accounting and auditing.

The consolidated financial statements of FIBK and its subsidiaries as of December 31, 2023, and for the year ended December 31, 2023, have been incorporated by reference herein and in the registration statement in reliance upon the report of RSM US LLP, independent registered public accounting firm, appearing elsewhere and incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**PART II** 

**INFORMATION NOT REQUIRED IN PROSPECTUS** 

**ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.** 

The following is an itemized statement of the estimated fees and expenses in connection with the offering of the securities registered hereunder.

---

| | |
|:---|:---|
| SEC registration fees  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \* |
| Legal fees and expenses  | \*\* |
| Accounting fees and expenses  | \*\* |
| Trustee fees and expenses | \*\* |
| Printing fees  | \*\* |
| Miscellaneous  | \*\* |
| Total  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \*\* |

---

__________________

\*Deferred in reliance on Rules 456(b) and 457(r).

\*\*Estimated expenses are not presently known.

**ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS** 

Section 102(b)(7) of the General Corporation Law of the State of Delaware (the "DGCL") provides that the certificate of incorporation of a corporation may contain a provision eliminating or limiting the personal liability of a director or officer to the corporation or its shareholders for monetary damages for breach of fiduciary duty as a director or officer, *provided* that such provision may not eliminate or limit the liability of (i) a director or officer for any breach of the director's or officer's duty of loyalty to the corporation or its stockholders, (ii) a director or officer for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) a director under Section 174 of the DGCL, (iv) a director or officer for any transaction from which the director or officer derived an improper personal benefit, or (v) an officer in any action by or in the right of the corporation. No such provision may eliminate or limit the liability of a director or officer for any act or omission occurring prior to the date when such provision became effective.

Section 145 of the DGCL permits a corporation to indemnify any director or officer of the corporation against expenses (including attorney's fees), judgments, fines and amounts paid in settlement actually and reasonably incurred in connection with any action, suit or proceeding brought by reason of the fact that such person is or was a director, officer, employee or agent of the corporation, or is or was serving at the request of the corporation as a director, officer, employee or agent of another enterprise, if such person acted in good faith and in a manner that the person reasonably believed to be in, or not opposed to, the best interests of the corporation, and, with respect to any criminal action or proceeding, if such person had no reasonable cause to believe such person's conduct was unlawful. In an action brought by or on behalf of the corporation, indemnification may be provided only for expenses actually and reasonably incurred by any director or officer in connection with the defense or settlement of such an action or suit if such person acted in good faith and in a manner that such person reasonably believed to be in, or not opposed to, the best interests of the corporation, except that no indemnification shall be provided if such person shall have been adjudged to be liable to the corporation, unless and only to the extent that the court in which the action or suit was brought shall determine upon application that such person is fairly and reasonably entitled to indemnity for such expenses despite such adjudication of liability.

Our Charter and Bylaws provide that the Corporation shall indemnify, to the fullest extent authorized by the DGCL, each person who is involved in any litigation or other proceeding because such person is or was a director or officer of the Corporation or is or was serving as an officer or director of another entity at our request, against all expense, loss or liability reasonably incurred or suffered in connection therewith so long as

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

such person acted in good faith and in a manner such person reasonably believed to be in or not opposed to the best interests of the Corporation, and, with respect to any criminal action or proceeding, had no reasonable cause to believe such person's conduct was unlawful. Under our Bylaws our directors and officers are indemnified by the Corporation to the fullest extent permitted by the DGCL from any expenses actually and reasonably incurred by any director or officer in connection with the defense or settlement of such an action. Our Bylaws provide that the right to indemnification includes the right to be paid expenses incurred in defending any proceeding in advance of its final disposition, *provided*, however, that such advance payment will be made upon receipt of a written request therefor (together with documentation reasonably evidencing such expenses) and an undertaking by or on behalf of the person to repay such amounts so advanced if it is ultimately determined that such person is not entitled to indemnification. In addition, no advancement of expenses will be made to an officer of the Corporation (except by reason of the fact that such officer is or was a director of the Corporation) in any proceeding if a determination is reasonably and promptly made (i) by a vote of the directors who are not parties to the applicable proceeding, even though less than a quorum, (ii) by a committee of such directors designated by the vote of the majority of such directors, even though less than a quorum, or (iii) if there are no such directors, or if such directors so direct, by independent legal counsel in a written opinion, that facts known to the decision-making party at the time such determination is made demonstrate clearly and convincingly that such person acted in bad faith or in a manner that such person did not believe to be in or not opposed to the best interests of the Corporation.

The rights conferred in our Charter and Bylaws are not exclusive of any other rights to indemnification or advancement of expenses to which a person may be entitled under the DGCL, our Charter, our Bylaws, any agreement, vote of stockholders or disinterested directors or otherwise. In addition, the Corporation is authorized to enter into indemnification agreements with its directors, officers, employees and agents and to purchase and maintain insurance on behalf of such persons.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**ITEM 16. EXHIBITS.** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)Index of Exhibits: The following exhibits are filed as part of this registration statement:

---

| | |
|:---|:---|
| **Exhibit No.**  | **Description of Document**  |
| 1.1\*  | Form of Underwriting Agreement.  |
| 3.1 | <u>[Certificate of Incorporation (incorporated herein by reference to Exhibit 3.1 to our Current Report on Form 8-K, File No. 001-34653, filed on May 25, 2023).](https://www.sec.gov/Archives/edgar/data/860413/000086041323000115/fibk-20230525xex31.htm)</u> |
| 3.2 | <u>[Amended and Restated](https://www.sec.gov/Archives/edgar/data/860413/000086041325000070/fibk-20250523xex_31bylaws.htm)[Bylaws](https://www.sec.gov/Archives/edgar/data/860413/000086041325000070/fibk-20250523xex_31bylaws.htm)[(](https://www.sec.gov/Archives/edgar/data/860413/000086041325000070/fibk-20250523xex_31bylaws.htm)[incorporated herein by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K, File No. 001-34653, filed on May 23, 2025)](https://www.sec.gov/Archives/edgar/data/860413/000086041325000070/fibk-20250523xex_31bylaws.htm)[.](https://www.sec.gov/Archives/edgar/data/860413/000086041325000070/fibk-20250523xex_31bylaws.htm)</u> |
| 4.1 | <u>[Form of Indenture for Senior Debt Securities](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[(inco](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[r](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[porated by reference](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[to](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[Exhibit 4.4 to](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[our Registration Statement on Form S-3ASR, File No.](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[333-272215, filed on May 26, 2023)](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[.](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)</u> |
| 4.2 | <u>[Indenture, dated May 15, 2020, between the Company and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee (incorporated herein by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K, File No. 001-34653, filed on May 18, 2020)](https://www.sec.gov/Archives/edgar/data/860413/000110465920062962/tm2012377d9_ex4-1.htm)[.](https://www.sec.gov/Archives/edgar/data/860413/000110465920062962/tm2012377d9_ex4-1.htm)</u> |
| 4.3 | <u>[Second Supplemental Indenture dated June 10, 2025, between the Company and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee (incorporated herein by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K, File No. 001-34653, filed on June 10, 2025)](https://www.sec.gov/Archives/edgar/data/860413/000110465925058170/tm258437d8_ex4-2.htm)[.](https://www.sec.gov/Archives/edgar/data/860413/000110465925058170/tm258437d8_ex4-2.htm)</u> |
| 4.4 | <u>[Form of 7.625% Fixed-to-Floating Rate Subordinated Notes due 2035 (incorporated herein by reference to Exhibit A of Exhibit 4.2 to the Company's Current Report on Form 8-K, File No. 001-34653, filed on June 10, 2025)](https://www.sec.gov/Archives/edgar/data/860413/000110465925058170/tm258437d8_ex4-2.htm)[.](https://www.sec.gov/Archives/edgar/data/860413/000110465925058170/tm258437d8_ex4-2.htm)</u> |
| 4.5 | <u>[Form of Senior Debt Securities (included in Exhibit 4.](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[1](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)[).](https://www.sec.gov/Archives/edgar/data/860413/000110465923064777/tm233533d2_ex4-4.htm)</u> |
| 4.6 | <u>[Form of Subordinated Debt Securities (included in Article II of Exhibit 4.2).](https://www.sec.gov/Archives/edgar/data/860413/000110465920062962/tm2012377d9_ex4-1.htm)</u> |
| 4.7\*  | Form of Warrant Agreement.  |
| 4.8\*  | Form of Certificate of Designations of Preferred Stock.  |
| 4.9\*  | Form of Depositary Agreement (including form of Depositary Receipt). |
| 4.10\*  | Form of Unit Agreement.  |
| 4.11\*  | Form of Purchase Contract.  |
| 5.1 | <u>[Opinion of Polsinelli PC.](ex51-fibxsx3asrmay2026.htm)</u> |
| 23.1 | <u>[Consent of](fibk-20260526xex231_consen.htm)[Ernst & Young](fibk-20260526xex231_consen.htm)[,](fibk-20260526xex231_consen.htm)[Independent Registered Public Accounting Firm.](fibk-20260526xex231_consen.htm)</u> |
| 23.2 | <u>[Consent of RSM US LLP, Independent Registered Public Accounting Firm.](fibk-20260526xex232_consen.htm)</u> |
| 23.3 | <u>[Consent of Polsinelli PC (included in Exhibit 5.1).](ex51-fibxsx3asrmay2026.htm)</u> |
| 24.1  | <u>[Power of Attorney (included on signature page).](#i273a1fae35aa4b78bf18a953d719f68b_365)</u> |
| 25.1\*\* | Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of Trustee to act as Trustee under the Senior Debt Securities Indenture. |
| 25.2 | <u>[Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of U.S. Bank Trust Company, National Association, as trustee under the Subordinated Debt Securities Indenture.](fibk-20260526xex252_formtx1.htm)</u> |
| 107  | <u>[Calculation of Filing Fee Table](fibkfilingfee.htm)[s](fibkfilingfee.htm)[.](fibkfilingfee.htm)</u> |

---

__________________

\*If applicable, to be filed by amendment or as an exhibit to a document to be incorporated by reference herein in connection with the issuance of the securities.

\*\*To be filed pursuant to Section 305(b)(2) of the Trust Indenture Act.

†We will file as an exhibit to a Current Report on Form 8-K (i) any underwriting, remarketing or agency agreement relating to the securities offered hereby, (ii) the instruments setting forth the terms or additional or different terms of any securities offered hereunder other than Common Stock, (iii) any additional required opinions of counsel with respect to the legality of the securities offered hereby and (iv) any required opinion of counsel as to certain tax matters relative to the securities offered hereby. Any required Statement of Eligibility and Qualification under the Trust Indenture Act on Form T-1 would be filed, if necessary, in accordance with the requirements of Section 305(b)(2) of the Trust Indenture Act.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**ITEM 17. UNDERTAKINGS.** 

The undersigned registrant hereby undertakes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)To reflect in the prospectus any facts or events arising after the effective date of this registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in this registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20 percent change in the maximum aggregate offering price set forth in the "Calculation of Filing Fee Tables" or "Calculation of Registration Fee" table, as applicable, in the effective registration statement; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)To include any material information with respect to the plan of distribution not previously disclosed in this registration statement or any material change to such information in this registration statement;

*provided, however,* that paragraphs (1)(i), (1)(ii) and (1)(iii) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SEC by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4)That, for the purpose of determining any liability under the Securities Act of 1933 to any purchaser:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by section 10(a) of the Securities Act of 1933 shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(5)That, for the purpose of determining liability of the registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv)Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(6)That, for the purposes of determining any liability under the Securities Act of 1933, each filing of the registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 that is incorporated by reference in this registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial *bona fide* offering thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(7)Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the provisions described under Item 15 of the registration statement, or otherwise, the registrant has been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person, in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of such issue.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(8)To file an application for the purpose of determining the eligibility of the trustees to act under subsection (a) of Section 310 of the Trust Indenture Act in accordance with the rules and regulations prescribed by the SEC under Section 305(b)(2) of the Trust Indenture Act.

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

**SIGNATURES** 

Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the city of Billings, State of Montana, on May 26, 2026.

---

| | |
|:---|:---|
| | **FIRST INTERSTATE BANCSYSTEM, INC.**  |
| By:  | /s/ David P. Della Camera |
|  | Name: David P. Della Camera |
|  | Title: Executive Vice President and Chief Financial Officer |

---

**POWERS OF ATTORNEY** 

We, the undersigned directors and officers of First Interstate BancSystem, Inc., do hereby constitute and appoint James A. Reuter, David P. Della Camera and Kirk D. Jensen our true and lawful attorneys-in-fact and agents, with full power of substitution in each of them, to do any and all acts and things in our name and on our behalf in our capacities as directors and officers and to execute any and all instruments for us and in our names in the capacities indicated below, which said attorneys-in-fact and agents may deem necessary or advisable to enable said registrant to comply with the Securities Act of 1933, as amended, and any rules, regulations and requirements of the Securities and Exchange Commission, in connection with this Registration Statement, including specifically, but without limitation, power and authority to sign for us or any of us in our names in the capacities indicated below, any and all amendments (including post-effective amendments) hereto and we do hereby ratify and confirm that said attorneys-in-fact and agents shall do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, as amended, this registration statement has been signed by the following persons in the capacities and on the dates indicated:

---

| | | |
|:---|:---|:---|
| **Signature**  | **Title**  | **Date**  |
| /s/ James A. Reuter | President, Chief Executive Officer and Director (Principal Executive Officer)  | May 26, 2026 |
| James A. Reuter | President, Chief Executive Officer and Director (Principal Executive Officer)  |  |
| /s/ David P. Della Camera | Executive Vice President and Chief Financial Officer (Principal Financial and Accounting Officer) | May 26, 2026 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;David P. Della Camera | Executive Vice President and Chief Financial Officer (Principal Financial and Accounting Officer) |  |
| /s/ Stephen B. Bowman | Director (Chair) | May 26, 2026 |
| Stephen B. Bowman | Director (Chair) |  |
| /s/ Renu Agrawal | Director | May 26, 2026 |
| Renu Agrawal | Director |  |
| /s/ Alice S. Cho  | Director | May 26, 2026 |
| Alice S. Cho | Director |  |

---

------

<u>[**Table of Contents**](#i273a1fae35aa4b78bf18a953d719f68b_100)</u>

---

| | | |
|:---|:---|:---|
| **Signature**  | **Title**  | **Date**  |
| /s/ John M. Heyneman Jr.  | Director | May 26, 2026 |
| John M. Heyneman Jr. | Director |  |
| /s/ David L. Jahnke  | Director | May 26, 2026 |
| David L. Jahnke | Director |  |
| /s/ Dennis L. Johnson | Director | May 26, 2026 |
| Dennis L. Johnson | Director |  |
| /s/ Stephen M. Lacy | Director | May 26, 2026 |
| Stephen M. Lacy | Director |  |
| /s/ Patricia L. Moss | Director | May 26, 2026 |
| Patricia L. Moss | Director |  |
| /s/ Joyce A. Phillips | Director | May 26, 2026 |
| Joyce A. Phillips | Director |  |
| /s/ Daniel A. Rykhus | Director | May 26, 2026 |
| Daniel A. Rykhus | Director |  |
| /s/ James R. Scott, Jr. | Director | May 26, 2026 |
| James R. Scott, Jr. | Director |  |
| /s/ Jeremy P. Scott | Director | May 26, 2026 |
| Jeremy P. Scott | Director |  |
| /s/ Michael L. Scudder | Director | May 26, 2026 |
| Michael L. Scudder | Director |  |

---

## Ex-Filing

?xml version='1.0' encoding='ASCII'? EX-FILING FEES

---

| |
|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Calculation of Filing Fee Tables**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **S-3**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **FIRST INTERSTATE BANCSYSTEM INC**  |

---

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| | | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Security Type**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Security Class Title**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Fee Calculation or Carry Forward Rule**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Maximum Aggregate Offering Price**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Fee Rate**  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Amount of Registration Fee**  |
| **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** |
| Fees to be Paid | 1 | Equity | Common Stock, par value $0.00001 per share | 457(r) |  | 0.0001381 |  |
| Fees to be Paid | 2 | Equity | Preferred Stock, par value $0.00001 per share | 457(r) |  | 0.0001381 |  |
| Fees to be Paid | 3 | Equity | Depository Shares | 457(r) |  | 0.0001381 |  |
| Fees to be Paid | 4 | Debt | Debt Securities | 457(r) |  | 0.0001381 |  |
| Fees to be Paid | 5 | Other | Warrants | 457(r) |  | 0.0001381 |  |
| Fees to be Paid | 6 | Other | Purchase Contracts | 457(r) |  | 0.0001381 |  |
| Fees to be Paid | 7 | Other | Units | 457(r) |  | 0.0001381 |  |
| Fees Previously Paid |  |  |  |  |  |  |  |
| **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** |
| Carry Forward Securities |  |  |  |  |  |  |  |
|  |  |  | Total Offering Amounts: | Total Offering Amounts: | $0.00  |  | $0.00  |
|  |  |  | Total Fees Previously Paid:  | Total Fees Previously Paid:  |  |  | $0.00  |
|  |  |  | Total Fee Offsets:  | Total Fee Offsets:  |  |  | $0.00  |
|  |  |  | Net Fee Due:  | Net Fee Due:  |  |  | $0.00  |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Offering Note** <br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>1</sup> An indeterminate aggregate number and amount of the securities of each class is being registered as may from time to time be offered and sold at indeterminate prices hereunder. The proposed maximum aggregate offering price per security will be determined from time to time by the registrant in connection with offers and sales of securities registered hereunder. Separate consideration may or may not be received for securities that are issuable on exercise, conversion or exchange of securities registered hereunder or that are represented by depositary shares. This registration statement also covers an indeterminate number of additional securities which may be issued (i) from time to time upon exercise, conversion or exchange of securities being registered hereunder and (ii) pursuant to Rule 416 under the Securities Act of 1933, as amended (the "Securities Act"), in connection with any stock split, stock dividend, reclassifications or similar transactions. In reliance on Rule 456(b) and Rule 457(r) under the Securities Act, the registrant is deferring payment of all registration fees and will pay the registration fees subsequently on a "pay-as-you-go" basis. The registrant will calculate the registration fee applicable to an offer of securities pursuant to this registration statement based on the fee payment rate in effect on the date of such fee payment.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>2</sup> See Note 1.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>3</sup> Each depositary share will be evidenced by depositary receipts issued pursuant to a deposit agreement. In the event the registrant elects to offer to the public whole or fractional interests in shares of preferred stock registered hereunder, depositary receipts will be distributed to those persons purchasing such interests and such shares will be issued to the depositary under the deposit agreement. See also Note 1.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>4</sup> May consist of one or more series of senior or subordinated debt. See also Note 1.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>5</sup> Warrants represent rights to purchase debt securities, common stock, or preferred stock registered hereunder. See also Note 1.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>6</sup> Purchase contracts may be issued separately or as part of units consisting of a purchase contract and any combination of shares of our common stock, preferred stock or depositary shares. See also Note 1.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <sup>7</sup> Any securities registered hereunder may be sold as units with other securities registered hereunder. Each unit will be issued under a unit agreement and will represent an interest in two or more securities, which may or may not be separable from one another. See also Note 1.

---

| |
|:---|
| |
| **Rules 457(b) and 0-11(a)(2)** |
| Fee Offset Claims |
| Fee Offset Sources |
| **Rule 457(p)** |
| Fee Offset Claims |
| Fee Offset Sources |

---

## Exhibit 5.1

**Exhibit 5.1**

---

| |
|:---|
| ![image_1.jpg](image_1.jpg) |
| 1401 Lawrence Street, Suite 2300, Denver, CO 80202 • (303) 572-9300 |

---

May 26, 2026

Board of Directors

First Interstate BancSystem, Inc.

401 North 31st Street

Billings, Montana 59101

**Re:&nbsp;&nbsp;&nbsp;&nbsp;First Interstate BancSystem, Inc. -- Registration Statement on Form S-3**

Ladies and Gentlemen:

We are acting as counsel to First Interstate BancSystem, Inc., a Delaware corporation (the "**Company**"), in connection with its shelf registration statement on Form S-3 (the "**Registration Statement**"), filed with the Securities and Exchange Commission relating to the proposed public offering of an indeterminate amount of one or more series of the following securities of the Company: (i) senior or subordinated debt securities (the "**Debt Securities**"); (ii) shares of preferred stock, $0.00001 par value per share (the "**Preferred Shares**"); (iii) shares of common stock, $0.00001 par value per share (the "**Common Shares**"); (iv) warrants to purchase Debt Securities (the "**Debt Warrants**"); (v) warrants to purchase Preferred Shares (the "**Preferred Stock Warrants**"); (vi) warrants to purchase Common Shares (the "**Common Stock Warrants**"); (vii) Preferred Shares represented by depositary receipts (the "**Depositary Shares**"); (viii) stock purchase contracts (the "**Stock Purchase Contracts**"); and (ix) units consisting of any combination of two or more of the foregoing (the "**Units**" and, together with the Debt Securities, Preferred Shares, Common Shares, Debt Warrants, Preferred Stock Warrants, Common Stock Warrants, Depositary Shares, and Stock Purchase Contracts, the "**Securities**"), all of which may be sold from time to time and on a delayed or continuous basis, as set forth in the prospectus which forms a part of the Registration Statement, and as to be set forth in one or more supplements to the prospectus. This opinion letter is furnished to you at your request to enable you to fulfill the requirements of Item 601(b)(5) of Regulation S-K, 17 C.F.R. § 229.601(b)(5), in connection with the Registration Statement.

For purposes of this opinion letter, we have examined copies of such agreements, instruments and documents as we have deemed an appropriate basis on which to render the opinions hereinafter expressed. In our examination of the aforesaid documents, we have assumed the genuineness of all signatures, the legal capacity of all natural persons, the accuracy and completeness of all documents submitted to us, the authenticity of all original documents, and the conformity to authentic original documents of all documents submitted to us as copies (including electronic copies). As to all matters of fact, we have relied on the representations and statements of fact made in the documents so reviewed, and we have not independently established the facts so relied on. This opinion letter is given, and all statements herein are made, in the context of the foregoing.

For purposes of this opinion letter, we have assumed that (i) the issuance, sale, amount and terms of any Securities of the Company to be offered from time to time will have been duly authorized and established by proper action of the board of directors of the Company or a duly authorized committee of such board ("**Board Action**") consistent with the procedures and terms described in the Registration Statement and in accordance with the Company's certificate of incorporation and amended and restated bylaws and applicable Delaware corporate law, and in a manner that does not violate any law, government or court-imposed order or restriction or agreement or instrument then binding on the Company or otherwise impair the legal or binding nature of the obligations represented by the applicable Securities; (ii) at the time of offer, issuance and sale of any Securities, the Registration Statement will have become effective under the Securities Act of 1933, as amended (the "**Act**"), and no stop order suspending its effectiveness will have been issued and remain in effect; (iii) any senior Debt Securities will be issued pursuant to a "senior indenture" to be entered into between the Company and a trustee, substantially in the form filed as Exhibit 4.1 to the Registration Statement, with items shown therein as subject to completion completed in a satisfactory

Atlanta \| Boston \| Chicago \| Dallas \| Denver \| Fort Lauderdale \| Fort Worth \| Houston

Kansas City \| Los Angeles \| Miami \| Nashville \| New York \| Park City \| Philadelphia \| Phoenix \| Raleigh

Salt Lake City \| San Diego \| San Francisco \| Seattle \| St. Louis \| Washington, D.C. \| Wilmington

polsinelli.com

------

![image_1.jpg](image_1.jpg)

Board of Directors

First Interstate BancSystem, Inc.

May 26, 2026

manner; (iv) any subordinated Debt Securities will be issued pursuant to the Indenture, dated as of May 15, 2020, between the Company and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee, filed as Exhibit 4.2 to the Registration Statement, or a successor in interest thereto; (v) any indenture under which any senior Debt Securities are issued will be or have been qualified under the Trust Indenture Act of 1939, as amended; (vi) any Debt Warrants will be issued under one or more debt warrant agreements, each to be between the Company and a financial institution identified therein as a warrant agent; (vii) any Preferred Stock Warrants will be issued under one or more equity warrant agreements, each to be between the Company and a financial institution identified therein as a warrant agent; (viii) any Common Stock Warrants will be issued under one or more equity warrant agreements, each to be between the Company and either a financial institution identified therein as a warrant agent or a holder directly, as applicable; (ix) prior to any issuance of Preferred Shares or Depositary Shares, an appropriate certificate of designation will be accepted for record by the Secretary of State of the State of Delaware; (x) any Depositary Shares will be issued under one or more deposit agreements by the financial institution identified therein as a depositary, each deposit agreement to be between the Company and the financial institution identified therein as a depositary; (xi) any Stock Purchase Contracts will be issued under one or more stock purchase contract agreements, each to be between the Company and a financial institution identified therein, and the adoption of any such stock purchase contract agreement will be or have been in accordance with applicable Delaware law; (xii) any Units will be issued under one or more unit agreements, each to be between the Company and the financial institution identified therein as unit agent; (xiii) if being sold by the Company, the Securities will be delivered against payment of valid consideration therefor and in accordance with the terms of the applicable Board Action authorizing such sale and any applicable underwriting agreement or purchase agreement and as contemplated by the Registration Statement and/or the applicable prospectus supplement; (xiv) the laws of the State of New York will be the governing law under any indenture, warrant agreement, deposit agreement, stock purchase contract agreement, or unit agreement; and (xv) the Company will remain a Delaware corporation.

To the extent that the obligations of the Company with respect to the Securities may be dependent upon such matters, we assume for purposes of this opinion that the other party under the indenture for any Debt Securities, under the warrant agreement for any Debt Warrants, Preferred Stock Warrants or Common Stock Warrants, under the deposit agreement for any Depositary Shares, under any stock purchase contract agreement for any Stock Purchase Contracts, and under any unit agreement for any Units, namely, the trustee, the warrant agent, the depositary, the stock purchase contract agent, or the unit agent, respectively, is duly organized, validly existing and in good standing under the laws of its jurisdiction of organization; that such other party is duly qualified to engage in the activities contemplated by such indenture, warrant agreement, deposit agreement, stock purchase contract agreement, or unit agreement, as applicable; that such indenture, warrant agreement, deposit agreement, stock purchase contract agreement, or unit agreement, as applicable, has been duly authorized, executed and delivered by the other party and constitutes the legal, valid and binding obligation of the other party enforceable against the other party in accordance with its terms; that such other party is in compliance with respect to performance of its obligations under such indenture, warrant agreement, deposit agreement, stock purchase contract agreement, or unit agreement, as applicable, with all applicable laws, rules and regulations; and that such other party has the requisite organizational and legal power and authority to perform its obligations under such indenture, warrant agreement, deposit agreement, stock purchase contract agreement, or unit agreement, as applicable.

This opinion letter is based as to matters of law solely on the applicable provisions of the following, as currently in effect: (i) as to the opinions given in paragraphs (a) and (b), the Delaware General Corporation Law, as amended, and (ii) as to the opinions given in paragraphs (c), (d), (e), (f), (g), (h) and (i), the laws of the State of New York (but not including any laws, statutes, ordinances, administrative decisions, rules or regulations of any political subdivision below the state level). We express no opinion herein as to any other statutes, rules or regulations (and in particular, we express no opinion as to any effect that such other statutes, rules or regulations may have on the opinions expressed herein).

------

![image_1.jpg](image_1.jpg)

Board of Directors

First Interstate BancSystem, Inc.

May 26, 2026

Based upon, subject to and limited by the foregoing, we are of the opinion that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The Common Shares (including any Common Shares to be issued upon conversion or exercise of Debt Securities, Preferred Shares, Common Stock Warrants, or Stock Purchase Contracts and assuming, if applicable, receipt by the Company of any additional consideration payable upon such conversion or exercise), upon due execution and delivery on behalf of the Company of certificates therefor, including global certificates, or the entry of the issuance thereof in the books and records of the Company, as the case may be, will be validly issued, fully paid and nonassessable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) The Preferred Shares (including any Preferred Shares to be issued upon conversion or exercise of Debt Securities, Preferred Stock Warrants, or Stock Purchase Contracts and assuming, if applicable, receipt by the Company of any additional consideration payable upon such conversion or exercise), upon due execution and delivery on behalf of the Company of certificates therefor, including global certificates, or the entry of the issuance thereof in the books and records of the Company, as the case may be, will be validly issued, fully paid and nonassessable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) The Debt Securities (including any Debt Securities duly issued upon the exercise of Debt Warrants), upon due execution and delivery of an indenture relating thereto on behalf of the Company and the trustee named therein in the case of senior Debt Securities, and upon authentication by the trustee under the indenture applicable to any such Debt Securities and due execution and delivery on behalf of the Company in accordance with any such indenture and any supplemental indenture relating thereto, will constitute valid and binding obligations of the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) The Debt Warrants, upon due execution and delivery of a debt warrant agreement relating thereto on behalf of the Company and the warrant agent named therein and due authentication of the Debt Warrants by such warrant agent to the extent applicable, and upon due execution and delivery of the Debt Warrants on behalf of the Company, will constitute valid and binding obligations of the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(e) The Preferred Stock Warrants, upon due execution and delivery of an equity warrant agreement relating thereto on behalf of the Company and the warrant agent named therein and due authentication of the Preferred Stock Warrants by such warrant agent, and upon due execution and delivery of the Preferred Stock Warrants on behalf of the Company, will constitute valid and binding obligations of the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f) The Common Stock Warrants, upon due execution and delivery of an equity warrant agreement relating thereto on behalf of the Company and either the warrant agent named therein, and due authentication of the Common Stock Warrants by such warrant agent, or a holder, in each case to the extent applicable, and upon due execution and delivery of the Common Stock Warrants on behalf of the Company, will constitute valid and binding obligations of the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(g) The depositary receipts evidencing the Depositary Shares, upon due countersignature thereof and issuance against a deposit of duly authorized and validly issued Preferred Shares in accordance with the deposit agreement relating thereto, will be validly issued and entitle the holders thereof to the rights specified in such depositary receipts and deposit agreement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h) The Stock Purchase Contracts, upon due execution and delivery of a stock purchase contract agreement relating thereto on behalf of the Company, and upon due execution and delivery of one or more certificates bearing such terms on behalf of the Company, will constitute valid and binding obligations of the Company.

------

![image_1.jpg](image_1.jpg)

Board of Directors

First Interstate BancSystem, Inc.

May 26, 2026

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) The Units, upon due execution and delivery of the applicable unit agreement relating thereto on behalf of the Company and the unit agent named therein, upon due authentication of the Units by such unit agent and upon due execution and delivery of the underlying Securities that are components of the Units in accordance with the applicable unit agreement and the applicable indenture (in the case of underlying Debt Securities), the applicable certificate of designation (in the case of underlying Preferred Shares or the Depositary Shares), warrant agreement (in the case of underlying Debt Warrants, Preferred Stock Warrants or Common Stock Warrants), or stock purchase contract agreement (in the case of underlying Stock Purchase Contracts), will constitute valid and binding obligations of the Company.

The opinions expressed in paragraphs (c) through (i) above with respect to the valid and binding nature of obligations may be limited by bankruptcy, insolvency, reorganization, receivership, moratorium or other laws affecting creditors' rights (including, without limitation, the effect of statutory and other law regarding fraudulent conveyances, fraudulent transfers and preferential transfers) and by the exercise of judicial discretion and the application of principles of equity, good faith, fair dealing, reasonableness, conscionability and materiality (regardless of whether the Securities are considered in a proceeding in equity or at law).

This opinion letter has been prepared for use in connection with the Registration Statement. We assume no obligation to advise of any changes in the foregoing subsequent to the effective date of the Registration Statement.

We hereby consent to the filing of this opinion letter as Exhibit 5.1 to the Registration Statement and to the reference to this firm under the caption "Validity of the Securities" in the prospectus constituting a part of the Registration Statement. In giving this consent, we do not thereby admit that we are an "expert" within the meaning of the Act.

Very truly yours,

/s/ Polsinelli PC

Polsinelli PC

## Exhibit 23.1

**Exhibit 23.1** 

**Consent of Independent Registered Public Accounting Firm** 

We consent to the reference to our firm under the caption "Experts" in this Registration Statement (Form S-3) and related Prospectus of First Interstate BancSystem, Inc. for the registration of Common Stock, Preferred Stock, Depositary Shares, Debt Securities, Warrants, Purchase Contracts, and Units and to the incorporation by reference therein of our reports dated February 26, 2026, with respect to the consolidated financial statements of First Interstate BancSystem, Inc. as of December 31, 2025 and 2024 and the effectiveness of internal control over financial reporting of First Interstate BancSystem, Inc., included in its Annual Report (Form 10-K) for the year ended December 31, 2025, filed with the Securities and Exchange Commission.

---

| |
|:---|
| /s/ Ernst & Young |
| Salt Lake City, Utah |
| May 26, 2026 |

---

## Exhibit 23.2

**Exhibit 23.2** 

**Consent of Independent Registered Public Accounting Firm** 

We consent to the incorporation by reference in this Registration Statement on Form S-3 of First Interstate BancSystem, Inc. of our report dated February 29, 2024, relating to the consolidated financial statements of First Interstate BancSystem, Inc., appearing in the Annual Report on Form 10-K of First Interstate BancSystem, Inc. for the year ended December 31, 2025.

We also consent to the reference to our firm under the heading "Experts" in such Registration Statement.

---

| |
|:---|
| /s/ RSM US LLP |
| Des Moines, Iowa |
| May 26, 2026 |

---

## Exhibit 25.2

**Exhibit 25.2**

<u>_____________________________________________________________________________</u> 

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

__________________________

**FORM T-1**

**STATEMENT OF ELIGIBILITY UNDER**

**THE TRUST INDENTURE ACT OF 1939 OF A** 

**CORPORATION DESIGNATED TO ACT AS TRUSTEE**

Check if an Application to Determine Eligibility of

a Trustee Pursuant to Section 305(b)(2) ☐

_______________________________________________________

**U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION**

(Exact name of Trustee as specified in its charter)

**91-1821036**

I.R.S. Employer Identification No.

800 Nicollet MallMinneapolis, Minnesota <br>55402 <br> <u>(Address of principal executive offices)</u> <u>(Zip Code)</u>

**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**

Michael W. McGuire

U.S. Bank Trust Company, National Association

10035 E 40th Ave

Denver, CO 80238

(303) 585-4594

(Name, address and telephone number of agent for service)

**First Interstate BancSystem, Inc.**

(Issuer with respect to the Securities)

---

| | |
|:---|:---|
| Delaware | 81-0331430 |
| (State or other jurisdiction of incorporation or organization) | (I.R.S. Employer Identification No.) |

---

401 North 31st StreetBillings, Montana <br>59101 <br> <u>(Address of Principal Executive Offices)</u> <u>(Zip Code)</u>

&nbsp;&nbsp;&nbsp;&nbsp;

**Subordinated Debt Securities**

 **(Title of the Indenture Securities)**

------

**<u>FORM T-1</u>**

**Item 1. GENERAL INFORMATION*.*** Furnish the following information as to the Trustee.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a)&nbsp;&nbsp;&nbsp;&nbsp;*Name and address of each examining or supervising authority to which it is subject.*

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Comptroller of the Currency

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Washington, D.C.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b)&nbsp;&nbsp;&nbsp;&nbsp;*Whether it is authorized to exercise corporate trust powers.* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Yes

**Item 2. AFFILIATIONS WITH THE OBLIGOR.** *If the obligor is an affiliate of the Trustee, describe each such affiliation.*

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None

**Items 3-15&nbsp;&nbsp;&nbsp;&nbsp;***Items 3-15 are not applicable because to the best of the Trustee's knowledge, the obligor is not in default under any Indenture for which the Trustee acts as Trustee.*

&nbsp;&nbsp;&nbsp;&nbsp;

**Item 16. LIST OF EXHIBITS:** *List below all exhibits filed as a part of this statement of eligibility and qualification.* 

&nbsp;&nbsp;&nbsp;&nbsp;1. A copy of the Articles of Association of the Trustee, attached as Exhibit 1.

&nbsp;&nbsp;&nbsp;&nbsp;2. A copy of the certificate of authority of the Trustee to commence business, attached as Exhibit 2.

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;3. A copy of the authorization of the Trustee to exercise corporate trust powers, included as Exhibit 2.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.&nbsp;&nbsp;&nbsp;&nbsp;A copy of the existing bylaws of the Trustee, attached as Exhibit 4.

&nbsp;&nbsp;&nbsp;&nbsp;5.&nbsp;&nbsp;&nbsp;&nbsp;A copy of each Indenture referred to in Item 4. Not applicable.

&nbsp;&nbsp;&nbsp;&nbsp;6.&nbsp;&nbsp;&nbsp;&nbsp;The consent of the Trustee required by Section 321(b) of the Trust Indenture Act of 1939, attached as Exhibit 6.

&nbsp;&nbsp;&nbsp;&nbsp;7.&nbsp;&nbsp;&nbsp;&nbsp;Report of Condition of the Trustee as of March 31, 2026, published pursuant to law or the requirements of its supervising or examining authority, attached as Exhibit 7.

------

**SIGNATURE**

&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Trust Indenture Act of 1939, as amended, the Trustee, U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, a national banking association organized and existing under the laws of the United States of America, has duly caused this statement of eligibility and qualification to be signed on its behalf by the undersigned, thereunto duly authorized, all in the City of Denver, State of Colorado on the 26<sup>th</sup> of May, 2026.

---

| | |
|:---|:---|
| By: | /s/ Michael W. McGuire |
|  | Michael W. McGuire |
|  | Vice President |

---

------

**<u>Exhibit 1</u>**

**ARTICLES OF ASSOCIATION OF**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**U. S. BANK TRUST COMPANY, NATIONAL ASSOCIATION**

For the purpose of organizing an association (the "Association") to perform any lawful activities of national banks, the undersigned enter into the following Articles of Association:

**FIRST**. The title of this Association shall be U. S. Bank Trust Company, National Association.

**SECOND**. The main office of the Association shall be in the city of Portland, county of Multnomah, state of Oregon. The business of the Association will be limited to fiduciary powers and the support of activities incidental to the exercise of those powers. The Association may not expand or alter its business beyond that stated in this article without the prior approval of the Comptroller of the Currency.

**THIRD**. The board of directors of the Association shall consist of not less than five nor more than twenty-five persons, the exact number to be fixed and determined from time to time by resolution of a majority of the full board of directors or by resolution of a majority of the shareholders at any annual or special meeting thereof. Each director shall own common or preferred stock of the Association or of a holding company owning the Association, with an aggregate par, fair market, or equity value of not less than $1,000, as of either (i) the date of purchase, (ii) the date the person became a director, or (iii) the date of that person's most recent election to the board of directors, whichever is more recent. Any combination of common or preferred stock of the Association or holding company may be used.

Any vacancy in the board of directors may be filled by action of a majority of the remaining directors between meetings of shareholders. The board of directors may increase the number of directors up to the maximum permitted by law. Terms of directors, including directors selected to fill vacancies, shall expire at the next regular meeting of shareholders at which directors are elected, unless the directors resign or are removed from office. Despite the expiration of a director's term, the director shall continue to serve until his or her successor is elected and qualified or until there is a decrease in the number of directors and his or her position is eliminated.

Honorary or advisory members of the board of directors, without voting power or power of final decision in matters concerning the business of the Association, may be appointed by resolution of a majority of the full board of directors, or by resolution of shareholders at any annual or special meeting. Honorary or advisory directors shall not be counted to determined the number of directors of the Association or the presence of a quorum in connection with any board action, and shall not be required to own qualifying shares.

**FOURTH.** There shall be an annual meeting of the shareholders to elect directors and transact whatever other business may be brought before the meeting. It shall be held at the main office or any other convenient place the board of directors may designate, on the day of each year specified therefor in the Bylaws, or if that day falls on a legal holiday in the state in which the Association is located, on the next following banking day. If no election is held on the day fixed or in the event of a legal holiday on the following banking day, an election may be held on any subsequent day within 60 days of the day fixed, to be designated by the board of directors, or, if the directors fail to fix the

 -1- 80000-383/060297/XBB02E85

------

day, by shareholders representing two-thirds of the shares issued and outstanding. In all cases, at least 10 days' advance notice of the meeting shall be given to the shareholders by first-class mail.

In all elections of directors, the number of votes each common shareholder may cast will be determined by multiplying the number of shares he or she owns by the number of directors to be elected. Those votes may be cumulated and cast for a single candidate or may be distributed among two or more candidates in the manner selected by the shareholder. On all other questions, each common shareholder shall be entitled to one vote for each share of stock held by him or her.

A director may resign at any time by delivering written notice to the board of directors, its chairperson, or to the Association, which resignation shall be effective when the notice is delivered unless the notice specifies a later effective date.

A director may be removed by the shareholders at a meeting called to remove him or her, when notice of the meeting stating that the purpose or one of the purposes is to remove him or her is provided, if there is a failure to fulfill one of the affirmative requirements for qualification, or for cause; provided, however, that a director may not be removed if the number of votes sufficient to elect him or her under cumulative voting is voted against his or her removal.

**FIFTH**. The authorized amount of capital stock of the Association shall be 1,000,000 shares of common stock of the par value of ten dollars ($10) each; but said capital stock may be increased or decreased from time to time, according to the provisions of the laws of the United States. The Association shall have only one class of capital stock.

No holder of shares of the capital stock of any class of the Association shall have any preemptive or preferential right of subscription to any shares of any class of stock of the Association, whether now or hereafter authorized, or to any obligations convertible into stock of the Association, issued, or sold, nor any right of subscription to any thereof other than such, if any, as the board of directors, in its discretion, may from time to time determine and at such price as the board of directors may from time to time fix.

Transfers of the Association's stock are subject to the prior written approval of a federal depository institution regulatory agency. If no other agency approval is required, the approval of the Comptroller of the Currency must be obtained prior to any such transfers.

Unless otherwise specified in the Articles of Association or required by law, (1) all matters requiring shareholder action, including amendments to the Articles of Association must be approved by shareholders owning a majority voting interest in the outstanding voting stock, and

(2) each shareholder shall be entitled to one vote per share.

Unless otherwise specified in the Articles of Association or required by law, all shares of voting stock shall be voted together as a class, on any matters requiring shareholder approval.

Unless otherwise provided in the Bylaws, the record date for determining shareholders entitled to notice of and to vote at any meeting is the close of business on the day before the first notice is mailed or otherwise sent to the shareholders, provided that in no event may a record date be more than 70 days before the meeting.

 -2- 80000-383/060297/XBB02E85

------

The Association, at any time and from time to time, may authorize and issue debt obligations, whether subordinated, without the approval of the shareholders. Obligations classified as debt, whether subordinated, which may be issued by the Association without the approval of shareholders, do not carry voting rights on any issue, including an increase or decrease in the aggregate number of the securities, or the exchange or reclassification of all or part of securities into securities of another class or series.

**SIXTH**. The board of directors shall appoint one of its members president of this Association and one of its members chairperson of the board and shall have the power to appoint one or more vice presidents, a secretary who shall keep minutes of the directors' and shareholders' meetings and be responsible for authenticating the records of the Association, and such other officers and employees as may be required to transact the business of this Association. A duly appointed officer may appoint one or more officers or assistant officers if authorized by the board of directors in accordance with the Bylaws.

The board of directors shall have the power to:

&nbsp;&nbsp;&nbsp;&nbsp;(1)Define the duties of the officers, employees, and agents of the Association.

&nbsp;&nbsp;&nbsp;&nbsp;(2)Delegate the performance of its duties, but not the responsibility for its duties, to the officers, employees, and agents of the Association.

&nbsp;&nbsp;&nbsp;&nbsp;(3)Fix the compensation and enter employment contracts with its officers and employees upon reasonable terms and conditions consistent with applicable law.

&nbsp;&nbsp;&nbsp;&nbsp;(4)Dismiss officers and employees.

&nbsp;&nbsp;&nbsp;&nbsp;(5)Require bonds from officers and employees and to fix the penalty thereof.

&nbsp;&nbsp;&nbsp;&nbsp;(6)Ratify written policies authorized by the Association's management or committees of the board.

&nbsp;&nbsp;&nbsp;&nbsp;(7)Regulate the manner any increase or decrease of the capital of the Association shall be made; provided that nothing herein shall restrict the power of shareholders to increase or decrease the capital of the Association in accordance with law, and nothing shall raise or lower from two-thirds the percentage required for shareholder approval to increase or reduce the capital.

&nbsp;&nbsp;&nbsp;&nbsp;(8)Manage and administer the business and affairs of the Association.

&nbsp;&nbsp;&nbsp;&nbsp;(9)Adopt initial Bylaws, not inconsistent with law or the Articles of Association, for managing the business and regulating the affairs of the Association.

&nbsp;&nbsp;&nbsp;&nbsp;(10)Amend or repeal Bylaws, except to the extent that the Articles of Association reserve this power in whole or in part to the shareholders.

&nbsp;&nbsp;&nbsp;&nbsp;(11)Make contracts.

&nbsp;&nbsp;&nbsp;&nbsp;(12)Generally perform all acts that are legal for a board of directors to perform.

 -3- 80000-383/060297/XBB02E85

------

**SEVENTH.** The board of directors shall have the power to change the location of the main office to any authorized branch within the limits of the city of Portland, Oregon, without the approval of the shareholders, or with a vote of shareholders owning two-thirds of the stock of the Association for a location outside such limits and upon receipt of a certificate of approval from the Comptroller of the Currency, to any other location within or outside the limits of the city of Portland, Oregon, but not more than thirty miles beyond such limits. The board of directors shall have the power to establish or change the location of any office or offices of the Association to any other location permitted under applicable law, without approval of shareholders, subject to approval by the Comptroller of the Currency.

**EIGHTH**. The corporate existence of this Association shall continue until termination according to the laws of the United States.

**NINTH**. The board of directors of the Association, or any shareholder owning, in the aggregate, not less than 25 percent of the stock of the Association, may call a special meeting of shareholders at any time. Unless otherwise provided by the Bylaws or the laws of the United States, or waived by shareholders, a notice of the time, place, and purpose of every annual and special meeting of the shareholders shall be given by first-class mail, postage prepaid, mailed at least 10, and no more than 60, days prior to the date of the meeting to each shareholder of record at his/her address as shown upon the books of the Association. Unless otherwise provided by the Bylaws, any action requiring approval of shareholders must be effected at a duly called annual or special meeting.

**TENTH**. These Articles of Association may be amended at any regular or special meeting of the shareholders by the affirmative vote of the holders of a majority of the stock of the Association, unless the vote of the holders of a greater amount of stock is required by law, and in that case by the vote of the holders of such greater amount; provided, that the scope of the Association's activities and services may not be expanded without the prior written approval of the Comptroller of the Currency. The Association's board of directors may propose one or more amendments to the Articles of Association for submission to the shareholders.

 -4- 80000-383/060297/XBB02E85

------

In witness whereof, we have hereunto set our hands this <u>11</u><sup>th</sup> of June, 1997.

![signatures.jpg](signatures.jpg)

------

**<u>Exhibit 2</u>**

![image_0.jpg](image_0.jpg)

------

**<u>Exhibit 4</u>**

**U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION**

**<u>AMENDED AND RESTATED BYLAWS</u>**

<u>ARTICLE</u> <u>I</u>

<u>Meetings of</u> <u>Shareholders</u>

Section 1.1. <u>Annual Meeting</u>. The annual meeting of the shareholders, for the election of directors and the transaction of any other proper business, shall be held at a time and place as the Chairman or President may designate. Notice of such meeting shall be given not less than ten (10) days or more than sixty (60) days prior to the date thereof, to each shareholder of the Association, unless the Office of the Comptroller of the Currency (the "OCC") determines that an emergency circumstance exists. In accordance with applicable law, the sole shareholder of the Association is permitted to waive notice of the meeting. If, for any reason, an election of directors is not made on the designated day, the election shall be held on some subsequent day, as soon thereafter as practicable, with prior notice thereof. Failure to hold an annual meeting as required by these Bylaws shall not affect the validity of any corporate action or work a forfeiture or dissolution of the Association.

Section 1.2. <u>Special Meetings</u>. Except as otherwise specially provided by law, special meetings of the shareholders may be called for any purpose, at any time by a majority of the board of directors (the "Board"), or by any shareholder or group of shareholders owning at least ten percent of the outstanding stock.

Every such special meeting, unless otherwise provided by law, shall be called upon not less than ten (10) days nor more than sixty (60) days prior notice stating the purpose of the meeting.

Section 1.3. <u>Nominations</u> <u>for</u> <u>Directors</u>. Nominations for election to the Board may be made by the Board or by any shareholder.

Section 1.4. <u>Proxies</u>. Shareholders may vote at any meeting of the shareholders by proxies duly authorized in writing. Proxies shall be valid only for one meeting and any adjournments of such meeting and shall be filed with the records of the meeting.

Section 1.5. <u>Record Date</u>. The record date for determining shareholders entitled to notice and to vote at any meeting will be thirty days before the date of such meeting, unless otherwise determined by the Board.

Section 1.6. <u>Quorum</u> <u>and</u> <u>Voting</u>. A majority of the outstanding capital stock, represented in person or by proxy, shall constitute a quorum at any meeting of shareholders, unless otherwise provided by law, but less than a quorum may adjourn any meeting, from time to time, and the meeting may be held as adjourned without further notice. A majority of the votes cast shall decide every question or matter submitted to the shareholders at any meeting, unless otherwise provided by law or by the Articles of Association.

------

Section 1.7. <u>Inspectors</u>. The Board may, and in the event of its failure so to do, the Chairman of the Board may appoint Inspectors of Election who shall determine the presence of quorum, the validity of proxies, and the results of all elections and all other matters voted upon by shareholders at all annual and special meetings of shareholders.

Section 1.8. <u>Waiver</u> <u>and</u> <u>Consent</u>. The shareholders may act without notice or a meeting by a unanimous written consent by all shareholders.

Section 1.9. <u>Remote</u> <u>Meetings</u>. The Board shall have the right to determine that a shareholder meeting not be held at a place, but instead be held solely by means of remote communication in the manner and to the extent permitted by the General Corporation Law of the State of Delaware.

<u>ARTICLE</u> <u>II</u>

<u>Directors</u>

Section 2.1. <u>Board</u> <u>of</u> <u>Directors</u>. The Board shall have the power to manage and administer the business and affairs of the Association. Except as expressly limited by law, all corporate powers of the Association shall be vested in and may be exercised by the Board.

Section 2.2. <u>Term of Office</u>. The directors of this Association shall hold office for one year and until their successors are duly elected and qualified, or until their earlier resignation or removal.

Section 2.3. <u>Powers</u>. In addition to the foregoing, the Board shall have and may exercise all of the powers granted to or conferred upon it by the Articles of Association, the Bylaws and by law.

Section 2.4. <u>Number</u>. As provided in the Articles of Association, the Board of this Association shall consist of no less than five nor more than twenty-five members, unless the OCC has exempted the Association from the twenty-five-member limit. The Board shall consist of a number of members to be fixed and determined from time to time by resolution of the Board or the shareholders at any meeting thereof, in accordance with the Articles of Association. Between meetings of the shareholders held for the purpose of electing directors, the Board by a majority vote of the full Board may increase the size of the Board but not to more than a total of twenty-five directors, and fill any vacancy so created in the Board; provided that the Board may increase the number of directors only by up to two directors, when the number of directors last elected by shareholders was fifteen or fewer, and by up to four directors, when the number of directors last elected by shareholders was sixteen or more. Each director shall own a qualifying equity interest in the Association or a company that has control of the Association in each case as required by applicable law. Each director shall own such qualifying equity interest in his or her own right and meet any minimum threshold ownership required by applicable law.

------

Section 2.5. <u>Organization</u> <u>Meeting</u>. The newly elected Board shall meet for the purpose of organizing the new Board and electing and appointing such officers of the Association as may be appropriate. Such meeting shall be held on the day of the election or as soon thereafter as practicable, and, in any event, within thirty days thereafter, at such time and place as the Chairman or President may designate. If, at the time fixed for such meeting, there shall not be a quorum present, the directors present may adjourn the meeting until a quorum is obtained.

Section 2.6. <u>Regular</u> <u>Meetings</u>. The regular meetings of the Board shall be held, without notice, as the Chairman or President may designate and deem suitable.

Section 2.7. <u>Special</u> <u>Meetings</u>. Special meetings of the Board may be called at any time, at any place and for any purpose by the Chairman of the Board or the President of the Association, or upon the request of a majority of the entire Board. Notice of every special meeting of the Board shall be given to the directors at their usual places of business, or at such other addresses as shall have been furnished by them for the purpose. Such notice shall be given at least twelve hours (three hours if meeting is to be conducted by conference telephone) before the meeting by telephone or by being personally delivered, mailed, or electronically delivered. Such notice need not include a statement of the business to be transacted at, or the purpose of, any such meeting.

Section 2.8. <u>Quorum</u> <u>and</u> <u>Necessary</u> <u>Vote</u>. A majority of the directors shall constitute a quorum at any meeting of the Board, except when otherwise provided by law; but less than a quorum may adjourn any meeting, from time to time, and the meeting may be held as adjourned without further notice. Unless otherwise provided by law or the Articles or Bylaws of this Association, once a quorum is established, any act by a majority of those directors present and voting shall be the act of the Board.

Section 2.9. <u>Written</u> <u>Consent</u>. Except as otherwise required by applicable laws and regulations, the Board may act without a meeting by a unanimous written consent by all directors, to be filed with the Secretary of the Association as part of the corporate records.

Section 2.10. <u>Remote Meetings</u>. Members of the Board, or of any committee thereof, may participate in a meeting of such Board or committee by means of conference telephone, video or similar communications equipment by means of which all persons participating in the meeting can hear each other and such participation shall constitute presence in person at such meeting.

Section 2.11. <u>Vacancies</u>. When any vacancy occurs among the directors, the remaining members of the Board may appoint a director to fill such vacancy at any regular meeting of the Board, or at a special meeting called for that purpose.

------

<u>ARTICLE</u> <u>III</u>

<u>Committees</u>

Section 3.1. <u>Advisory</u> <u>Board</u> <u>of</u> <u>Directors</u>. The Board may appoint persons, who need not be directors, to serve as advisory directors on an advisory board of directors established with respect to the business affairs of either this Association alone or the business affairs of a group of affiliated organizations of which this Association is one. Advisory directors shall have such powers and duties as may be determined by the Board, provided, that the Board's responsibility for the business and affairs of this Association shall in no respect be delegated or diminished.

Section 3.2. <u>Trust Audit Committee</u>. At least once during each calendar year, the Association shall arrange for a suitable audit (by internal or external auditors) of all significant fiduciary activities under the direction of its trust audit committee, a function that will be fulfilled by the Audit Committee of the financial holding company that is the ultimate parent of this Association. The Association shall note the results of the audit (including significant actions taken as a result of the audit) in the minutes of the Board. In lieu of annual audits, the Association may adopt a continuous audit system in accordance with 12 C.F.R. § 9.9(b).

The Audit Committee of the financial holding company that is the ultimate parent of this Association, fulfilling the function of the trust audit committee:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)Must not include any officers of the Association or an affiliate who participate significantly in the administration of the Association's fiduciary activities; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)Must consist of a majority of members who are not also members of any committee to which the Board has delegated power to manage and control the fiduciary activities of the Association.

Section 3.3. <u>Executive Committee</u>. The Board may appoint an Executive Committee which shall consist of at least three directors and which shall have, and may exercise, to the extent permitted by applicable law, all the powers of the Board between meetings of the Board or otherwise when the Board is not meeting.

Section 3.4. <u>Trust</u> <u>Management</u> <u>Committee</u>. The Board of this Association shall appoint a Trust Management Committee to provide oversight of the fiduciary activities of the Association. The Trust Management Committee shall determine policies governing fiduciary activities. The Trust Management Committee or such sub-committees, officers or others as may be duly designated by the Trust Management Committee shall oversee the processes related to fiduciary activities to assure conformity with fiduciary policies it establishes, including ratifying the acceptance and the closing out or relinquishment of all trusts. The Trust Management Committee will provide regular reports of its activities to the Board.

------

Section 3.5. <u>Other Committees</u>. The Board may appoint, from time to time, committees of one or more persons who need not be directors, for such purposes and with such powers as the Board may determine; however, the Board will not delegate to any committee any powers or responsibilities that it is prohibited from delegating under any law or regulation. In addition, either the Chairman or the President may appoint, from time to time, committees of one or more officers, employees, agents or other persons, for such purposes and with such powers as either the Chairman or the President deems appropriate and proper. Whether appointed by the Board, the Chairman, or the President, any such committee shall at all times be subject to the direction and control of the Board.

Section 3.6. <u>Meetings, Minutes and Rules</u>. An advisory board of directors and/or committee shall meet as necessary in consideration of the purpose of the advisory board of directors or committee, and shall maintain minutes in sufficient detail to indicate actions taken or recommendations made; unless required by the members, discussions, votes or other specific details need not be reported. An advisory board of directors or a committee may, in consideration of its purpose, adopt its own rules for the exercise of any of its functions or authority.

<u>ARTICLE</u> <u>IV</u>

<u>Officers</u>

Section 4.1&nbsp;&nbsp;&nbsp;&nbsp;Who Shall Constitut<u>e.</u> The Officers of the Association shall be a Chief Executive Officer, a President, a Secretary, and other officers such as Vice Chair, Executive Vice Presidents, Senior Vice Presidents, Vice Presidents, Assistant Vice Presidents, Assistant Secretaries, Trust Officers, Assistant Trust Officers, Controller, and Assistant Controller, as the Board may appoint from time to time. The Board may appoint or elect a person as a Vice Chair without regard to whether such person is a member of the Board. The Board may choose to delegate authority to elect officers other than the Chief Executive Officer, President, Secretary, Vice Chairs and Senior Executive Vice Presidents, to the President. Any person may hold two offices. The President shall at all times be a member of the Board of Directors.

Section 4.2&nbsp;&nbsp;&nbsp;&nbsp;Term of Offic<u>e.</u> All officers shall be elected for and shall hold office until their respective successors are elected and qualified or until their earlier death, resignation, retirement, disqualification or removal from office, subject to the right of the Board of Directors in its sole discretion to discharge any officer at any time. The Board may choose to delegate authority to remove officers other than the Chairman, Chief Executive Officer, President, Secretary, Vice Chair and Senior Executive Vice Presidents, to the President.

Section 4.3. <u>Chairman of the Board</u>. The Board may appoint one of its members to be Chairman of the Board to serve at the pleasure of the Board. The Chairman shall supervise the carrying out of the policies adopted or approved by the Board; shall have general executive powers, as well as the specific powers conferred by these Bylaws; and shall also have and may exercise such powers and duties as from time to time may be conferred upon or assigned by the Board.

------

Section 4.4. <u>President</u>. The Board may appoint one of its members to be President of the Association. In the absence of the Chairman, the President shall preside at any meeting of the Board. The President shall have general executive powers, and shall have and may exercise any and all other powers and duties pertaining by law, regulation or practice, to the office of President, or imposed by these Bylaws. The President shall also have and may exercise such powers and duties as from time to time may be conferred or assigned by the Board.

Section 4.5. <u>Vice President</u>. The Board may appoint one or more Vice Presidents who shall have such powers and duties as may be assigned by the Board and to perform the duties of the President on those occasions when the President is absent, including presiding at any meeting of the Board in the absence of both the Chairman and President.

Section 4.6. <u>Secretary</u>. The Board shall appoint a Secretary, or other designated officer who shall be Secretary of the Board and of the Association, and shall keep accurate minutes of all meetings. The Secretary shall attend to the giving of all notices required by these Bylaws to be given; shall be custodian of the corporate seal, records, documents and papers of the Association; shall provide for the keeping of proper records of all transactions of the Association; shall, upon request, authenticate any records of the Association; shall have and may exercise any and all other powers and duties pertaining by law, regulation or practice, to the Secretary, or imposed by these Bylaws; and shall also perform such other duties as may be assigned from time to time by the Board. The Board may appoint one or more Assistant Secretaries with such powers and duties as the Board, the President or the Secretary shall from time to time determine.

Section 4.7. <u>Other Officers</u>. The Board may appoint, and may authorize the Chairman, the President or any other officer to appoint, any officer as from time to time may appear to the Board, the Chairman, the President or such other officer to be required or desirable to transact the business of the Association.

Such officers shall exercise such powers and perform such duties as pertain to their several offices, or as may be conferred upon or assigned to them by these Bylaws, the Board, the Chairman, the President or such other authorized officer. Any person may hold two offices.

------

<u>ARTICLE</u> <u>V</u>

<u>Stock</u>

Section 5.1. The Board may authorize the issuance of stock either in certificated or in uncertificated form. Certificates for shares of stock shall be in such form as the Board may from time to time prescribe. If the Board issues certificated stock, the certificate shall be signed by the President, Secretary or any other such officer as the Board so determines. Shares of stock shall be transferable on the books of the Association, and a transfer book shall be kept in which all transfers of stock shall be recorded. Every person becoming a shareholder by such transfer shall, in proportion to such person's shares, succeed to all rights of the prior holder of such shares. Each certificate of stock shall recite on its face that the stock represented thereby is transferable only upon the books of the Association properly endorsed. The Board may impose conditions upon the transfer of the stock reasonably calculated to simplify the work of the Association for stock transfers, voting at shareholder meetings, and related matters, and to protect it against fraudulent transfers.

<u>ARTICLE</u> <u>VI</u>

<u>Corporate</u> <u>Seal</u>

Section 6.1. The Association shall have no corporate seal; provided, however, that if the use of a seal is required by, or is otherwise convenient or advisable pursuant to, the laws or regulations of any jurisdiction, the following seal may be used, and the Chairman, the President, the Secretary and any Assistant Secretary shall have the authority to affix such seal:

<u>ARTICLE</u> <u>VII</u>

<u>Miscellaneous</u> <u>Provisions</u>

Section 7.1. <u>Execution of Instruments</u>. All agreements, checks, drafts, orders, indentures, notes, mortgages, deeds, conveyances, transfers, endorsements, assignments, certificates, declarations, receipts, discharges, releases, satisfactions, settlements, petitions, schedules, accounts, affidavits, bonds, undertakings, guarantees, proxies and other instruments or documents may be signed, countersigned, executed, acknowledged, endorsed, verified, delivered or accepted on behalf of the Association, whether in a fiduciary capacity or otherwise, by any officer of the Association, or such employee or agent as may be designated from time to time by the Board by resolution, or by the Chairman or the President by written instrument, which resolution or instrument shall be certified as in effect by the Secretary or an Assistant Secretary of the Association. The provisions of this section are supplementary to any other provision of the Articles of Association or Bylaws.

Section 7.2. <u>Records</u>. The Articles of Association, the Bylaws as revised or amended from time to time and the proceedings of all meetings of the shareholders, the Board, and standing committees of the Board, shall be recorded in appropriate minute books provided for the purpose. The minutes of each meeting shall be signed by the Secretary, or other officer appointed to act as Secretary of the meeting.

------

Section 7.3. <u>Trust</u> <u>Files</u>. There shall be maintained in the Association files all fiduciary records necessary to assure that its fiduciary responsibilities have been properly undertaken and discharged.

Section 7.4. <u>Trust Investments</u>. Funds held in a fiduciary capacity shall be invested according to the instrument establishing the fiduciary relationship and according to law. Where such instrument does not specify the character and class of investments to be made and does not vest in the Association a discretion in the matter, funds held pursuant to such instrument shall be invested in investments in which corporate fiduciaries may invest under law.

Section 7.5. <u>Notice</u>. Whenever notice is required by the Articles of Association, the Bylaws or law, such notice shall be by mail, postage prepaid, e-mail, in person, or by any other means by which such notice can reasonably be expected to be received, using the address of the person to receive such notice, or such other personal data, as may appear on the records of the Association. Except where specified otherwise in these Bylaws, prior notice shall be proper if given not more than 30 days nor less than 10 days prior to the event for which notice is given.

<u>ARTICLE</u> <u>VIII</u>

<u>Indemnification</u>

Section 8.1. The Association shall indemnify such persons for such liabilities in such manner under such circumstances and to such extent as permitted by Section 145 of the Delaware General Corporation Law, as now enacted or hereafter amended. The Board may authorize the purchase and maintenance of insurance and/or the execution of individual agreements for the purpose of such indemnification, and the Association shall advance all reasonable costs and expenses (including attorneys' fees) incurred in defending any action, suit or proceeding to all persons entitled to indemnification under this Section 8.1. Such insurance shall be consistent with the requirements of 12 C.F.R. § 7.2014 and shall exclude coverage of liability for a formal order assessing civil money penalties against an institution-affiliated party, as defined at 12 U.S.C. § 1813(u).

Section 8.2. Notwithstanding Section 8.1, however, (a) any indemnification payments to an institution-affiliated party, as defined at 12 U.S.C. § 1813(u), for an administrative proceeding or civil action initiated by a federal banking agency, shall be reasonable and consistent with the requirements of 12 U.S.C. § 1828(k) and the implementing regulations thereunder; and (b) any indemnification payments and advancement of costs and expenses to an institution-affiliated party, as defined at 12 U.S.C. § 1813(u), in cases involving an administrative proceeding or civil action not initiated by a federal banking agency, shall be in accordance with Delaware General Corporation Law and consistent with safe and sound banking practices.

------

<u>ARTICLE</u> <u>IX</u>

<u>Bylaws:</u> <u>Interpretation</u> <u>and</u> <u>Amendment</u>

Section 9.1. These Bylaws shall be interpreted in accordance with and subject to appropriate provisions of law, and may be added to, altered, amended, or repealed, at any regular or special meeting of the Board.

Section 9.2. A copy of the Bylaws and all amendments shall at all times be kept in a convenient place at the principal office of the Association, and shall be open for inspection to all shareholders during Association hours.

<u>ARTICLE</u> <u>X</u>

<u>Miscellaneous</u> <u>Provisions</u>

Section 10.1. <u>Fiscal</u> <u>Year</u>. The fiscal year of the Association shall begin on the first day of January in each year and shall end on the thirty-first day of December following.

Section 10.2. <u>Governing Law</u>. This Association designates the Delaware General Corporation Law, as amended from time to time, as the governing law for its corporate governance procedures, to the extent not inconsistent with Federal banking statutes and regulations or bank safety and soundness.

\*\*\*

(November 6, 2025)

------

**<u>Exhibit 6</u>**

**CONSENT**&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;In accordance with Section 321(b) of the Trust Indenture Act of 1939, the undersigned, U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION hereby consents that reports of examination of the undersigned by Federal, State, Territorial or District authorities may be furnished by such authorities to the Securities and Exchange Commission upon its request therefor.

Dated: May 26<sup>th</sup>, 2026

---

| | |
|:---|:---|
| By: | /s/ Michael W. McGuire |
|  | Michael W. McGuire |
|  | Vice President |

---

------

**<u>Exhibit 7</u>**

**U.S. Bank Trust Company, National Association**

**Statement of Financial Condition**

**as of 3/31/2026**

**($000's)** 

**&nbsp;&nbsp;&nbsp;&nbsp;3/31/2026** 

**Assets**

**&nbsp;&nbsp;&nbsp;&nbsp;**Cash and Balances Due From &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$2,159,991

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Depository Institutions

&nbsp;&nbsp;&nbsp;&nbsp;Securities&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4,683

&nbsp;&nbsp;&nbsp;&nbsp;Federal Funds&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0

&nbsp;&nbsp;&nbsp;&nbsp;Loans & Lease Financing Receivables&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;0

&nbsp;&nbsp;&nbsp;&nbsp;Fixed Assets&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;534

&nbsp;&nbsp;&nbsp;&nbsp;Intangible Assets&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;573,596

&nbsp;&nbsp;&nbsp;&nbsp;Other Assets&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;160,011

&nbsp;&nbsp;&nbsp;&nbsp;**Total Assets&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;$2,898,815**

**Liabilities**

**&nbsp;&nbsp;&nbsp;&nbsp;**Deposits&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$0

&nbsp;&nbsp;&nbsp;&nbsp;Fed Funds&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0

&nbsp;&nbsp;&nbsp;&nbsp;Treasury Demand Notes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0

&nbsp;&nbsp;&nbsp;&nbsp;Trading Liabilities&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;0

&nbsp;&nbsp;&nbsp;&nbsp;Other Borrowed Money&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0

&nbsp;&nbsp;&nbsp;&nbsp;Acceptances&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0

&nbsp;&nbsp;&nbsp;&nbsp;Subordinated Notes and Debentures&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0

&nbsp;&nbsp;&nbsp;&nbsp;Other Liabilities&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;221,704

&nbsp;&nbsp;&nbsp;&nbsp;**Total Liabilities&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$221,704**

**Equity**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Common and Preferred Stock&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;200

&nbsp;&nbsp;&nbsp;&nbsp;Surplus&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1,171,635

&nbsp;&nbsp;&nbsp;&nbsp;Undivided Profits&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1,505,276

**&nbsp;&nbsp;&nbsp;&nbsp;**Minority Interest in Subsidiaries&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Total Equity Capital&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$2,677,111**

**Total Liabilities and Equity Capital&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$2,898,815**

****

<br>