First Interstate BancSystem closes sale of 12 branches to Enterprise

First Interstate BancSystem (FIBK) completed a branch divestiture.

Rhea-AI Filing Summary

First Interstate BancSystem (FIBK) completed a branch divestiture. On October 10, 2025, its subsidiary First Interstate Bank closed the previously announced transaction with Enterprise Bank & Trust, under which Enterprise acquired twelve branches in Arizona and Kansas.

The transfer includes specified deposits and loans, the owned real estate, and fixed and other assets tied to the branches. The disclosure was furnished under Item 7.01 of Regulation FD.

Insights

Bank operations analyst

Branch sale closed; twelve locations transferred to Enterprise.

First Interstate BancSystem reported closing a previously announced branch transfer on October 10, 2025. Enterprise Bank & Trust acquired twelve branches in Arizona and Kansas, along with specified deposits, loans, real estate, and related fixed and other assets.

This is presented as an Item 7.01 Regulation FD disclosure. Operationally, the move reduces FIBK’s footprint in those states and migrates associated customer relationships and assets to Enterprise.

Subsequent filings may provide additional financial details or effects of the branch transfer.

8-K Event Classification

Item 7.01 — Regulation FD Disclosure

1 item

Item 7.01 Regulation FD Disclosure Disclosure

Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did FIBK announce in this 8-K?

First Interstate BancSystem said its bank subsidiary closed a previously announced transaction transferring twelve branches to Enterprise Bank & Trust.

How many branches were involved for FIBK (NASDAQ: FIBK)?

Twelve branches were transferred.

Where are the branches FIBK transferred?

The branches are in Arizona and Kansas.

What assets moved with the branches from FIBK?

Specified deposits and loans, the owned real estate, and fixed and other assets associated with the branches.

When did the branch transfer close for FIBK?

The closing occurred on October 10, 2025.

Under which item was this disclosure furnished?

Item 7.01, Regulation FD Disclosure.

Is this information deemed filed or incorporated by reference?

It is furnished and not deemed filed, nor incorporated by reference, except as expressly stated.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 10/14/2025 - 10:01 AM Learn about SEC filing dates

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

 ------------------------------ 

FORM 8-K

------------------------------ 

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (date of earliest event reported): October 10, 2025

 ------------------------------ 

FIRST INTERSTATE BANCSYSTEM, INC.

(Exact name of registrant as specified in its charter)

 ------------------------------ 

Delaware

001-34653

81-0331430

(State or other jurisdiction of incorporation or organization)

(Commission File No.)

(IRS Employer Identification No.)

401 North 31st Street

Billings,

MT

59101

(Address of principal executive offices)

(zip code)

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

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

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

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

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

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

* * * * *

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

Title of each class			Trading Symbol(s)			Name of exchange on which registered
Common stock, $0.00001 par value			FIBK			NASDAQ

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

    Emerging growth company ☐

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

* * * * *

Item 7.01. Regulation FD Disclosure.

On October 10, 2025, First Interstate BancSystem, Inc.’s wholly owned subsidiary, First Interstate Bank (“First Interstate”), closed the previously-announced transaction with Enterprise Bank & Trust (“Enterprise Bank”), a wholly owned subsidiary of Enterprise Financial Services Corp, pursuant to which Enterprise Bank acquired the twelve branches previously identified in Arizona and Kansas (the "Branches") from First Interstate, including specified deposits and loans, the owned real estate, and fixed and other assets associated with the Branches.

Information contained in Item 7.01 of this Current Report on Form 8-K shall neither be deemed filed for purposes of the Securities Exchange Act of 1934, as amended, nor shall such information 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.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

			Exhibit No.						Exhibit Description
			104						Cover Page Interactive Data File (embedded within Inline XBRL document).

SIGNATURES

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

Dated: October 14, 2025

			FIRST INTERSTATE BANCSYSTEM, INC.
			By:			/s/ KIRK D. JENSEN
						Kirk D. Jensen
						Executive Vice President, General Counsel and Secretary