FIRST INTERSTATE BANCSYSTEM, INC. Files 8-K

Ticker: FIBK · Form: 8-K · Filed: Oct 16, 2025 · CIK: 860413

First Interstate Bancsystem INC 8-K Filing Summary
FieldDetail
CompanyFirst Interstate Bancsystem INC (FIBK)
Form Type8-K
Filed DateOct 16, 2025
Risk Levellow
Pages4
Reading Time4 min
Key Dollar Amounts$0.00001
Sentimentneutral

Sentiment: neutral

Topics: disclosure, financials

Related Tickers: FIBK

TL;DR

FIBK filed an 8-K on 10/16/25 for Reg FD disclosure and exhibits. No major news.

AI Summary

On October 16, 2025, FIRST INTERSTATE BANCSYSTEM, INC. filed an 8-K report. The filing primarily concerns Regulation FD Disclosure and includes Financial Statements and Exhibits. No specific financial transactions or material events were detailed in the provided excerpt.

Why It Matters

This 8-K filing indicates that FIRST INTERSTATE BANCSYSTEM, INC. is providing updated disclosures and financial information to the SEC, which is standard practice for public companies.

Risk Assessment

Risk Level: low — The filing is a routine disclosure and does not appear to contain any negative or market-moving information.

Key Players & Entities

FAQ

What is the primary purpose of this 8-K filing?

The primary purpose of this 8-K filing is for Regulation FD Disclosure and to include Financial Statements and Exhibits.

What is the exact name of the registrant?

The exact name of the registrant is FIRST INTERSTATE BANCSYSTEM, INC.

On what date was this report filed?

The report was filed on October 16, 2025.

Where are the principal executive offices of the registrant located?

The principal executive offices are located at 401 North 31st Street, Billings, MT 59101.

What is the Commission File Number for this registrant?

The Commission File Number for FIRST INTERSTATE BANCSYSTEM, INC. is 001-34653.

Filing Stats: 1,100 words · 4 min read · ~4 pages · Grade level 11.9 · Accepted 2025-10-16 16:01:36

Key Financial Figures

Filing Documents

01. Regulation FD Disclosure

Item 7.01. Regulation FD Disclosure. On October 16, 2025, First Interstate BancSystem, Inc. (the "Company") issued a joint press release with Security First Bank ("Security First") announcing the entry by the Company's wholly owned subsidiary, First Interstate Bank ("First Interstate"), into a Purchase and Assumption Agreement, dated as of October 15, 2025 (the "Purchase Agreement"), with Security First, pursuant to which Security First will acquire eleven branches (the "Branches") from First Interstate, including the deposits and loans identified in the Purchase Agreement, and the owned real estate and fixed and other assets associated with the Branches. The Branches Security First has agreed to acquire are: 423 W 3rd St., Alliance, NE 69301 118 East State St., Atkinson, NE 68713 901 South D Street, Broken Bow, NE 68822 163 Grand Ave., Burwell, NE 68823 101 E Kimball St., Callaway, NE 68825 211 W C St., McCook, NE 69001 400 Braasch Ave., Norfolk, NE 68701 330 East Douglas Street, O'Neill, NE 68763 1504 L St., Ord, NE 68862 2001 Broadway Ste. 1, Scottsbluff, NE 69361 1028 Toledo St., Sidney, NE 69162 Consummation of the transaction is subject to regulatory approval and satisfaction of other customary conditions to closing. It is currently anticipated that the closing of the transaction will take place by early 2026. A copy of this press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein. Information contained in Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1, shall neither be deemed filed for purposes of the Securities Exchange Act of 1934, as amended, nor shall such information or exhibit be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as expressly set forth by specific reference in such a filing. Cautionary Note Regarding Forward-looking Statements This Current Report on Form 8-K contains "forward-looking sta

01 Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits. (d) Exhibits. Exhibit No. Exhibit Description 99.1 Press Release dated October 16, 2025. 104 Cover Page Interactive Data File (embedded within Inline XBRL document).

SIGNATURES

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Dated: October 16, 2025 FIRST INTERSTATE BANCSYSTEM, INC. By: /s/ KIRK D. JENSEN Kirk D. Jensen Executive Vice President, General Counsel and Secretary

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