FIRST INTERSTATE BANCSYSTEM INC

For the period ended Dec 31, 2025. Filed Feb 26, 2026.

About this filing

A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 26, 2026

FIBK$38.42+1.6%Stored close · as of Nov 9, 2026

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Contents

Financial Statements and Supplementary Data

The following consolidated financial statements of First Interstate BancSystem, Inc. and subsidiaries are contained in Part IV, Item 15 of this report and are incorporated herein by reference.

Report of Ernst & Young LLP, Independent Registered Public Accounting Firm for the years ended December 31, 2025 and December 31, 2024 (PCAOB ID:42)

Report of RSM US LLP, Independent Registered Public Accounting Firm for the year ended December 31, 2023 (PCAOB ID:49)

Consolidated Statements of Stockholders’ Equity — Years Ended December 31, 2025, 2024, and 2023

Notes to Consolidated Financial Statements

ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.