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FIRST INTERSTATE BANCSYSTEM INC

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

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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

Item 9B. Other Information

The Company has filed as exhibits to this form (a) a new form of Performance Restricted Stock Unit Grant Agreement (Core Return on Average Tangible Common Equity) and a new form of Performance Restricted Stock Unit Grant Agreement (Total Shareholder Return), each of which may be used as a template for awards of performance restricted stock units and (b) a new form of Restricted Stock Unit Grant Agreement (Time-Based) that may be used as a template for awards of restricted stock units, in each case that may be granted to eligible participants under the 2023 Equity and Incentive Plan, unless otherwise determined by the Compensation Committee of the Board.

Rule 10b5-1 Trading Plans

During the fiscal quarter ended December 31, 2025, none of the Company’s directors or executive officers adopted, modified orterminated any contract, instruction or written plan for the purchase or sale of Company securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement.”

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