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FIRST INTERSTATE BANCSYSTEM INC

For the period ended Sep 30, 2025. Filed Nov 6, 2025.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2025 · Filed Nov 6, 2025

FIBK$38.00-1.1%Stored close · as of Nov 10, 2026

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Unregistered Sales of Equity Securities and Use of Proceeds

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(a) There were no unregistered sales of equity securities during the three months ended September 30, 2025.

(b) Not applicable.

(c) The following table provides information with respect to purchases made of our common stock by or on behalf of us or any “affiliated purchasers” (as defined in Rule 10b-18(a)(3) under the Exchange Act), during the three months ended September 30, 2025.

Total Number of · Approximate Dollar Value
Shares Purchased as Part · of Shares That May
Total Number ofAverage Priceof Publicly AnnouncedYet Be Purchased Under
PeriodShares PurchasedPaid Per SharePlans or Programsthe Plans or Programs(1)
July 1, 2025 to July 31, 2025—$——$—
Stock Repurchase Program(1)———150,000,000
Stock Repurchase Program(1)842,90332.58842,903122,539,093
Employee Transactions(2)3032.56——
Total842,933$32.58842,903$122,539,093

(1) On August 28, 2025, the board of directors of the Company adopted a new stock repurchase program. Under the new stock repurchase program, the Company was provided authorization to repurchase up to $150.0 million of its issued and outstanding shares of common stock on or prior to March 31, 2027, which is the expiration date of the program. Shares of common stock may be purchased through open market purchases, private transactions, block trades, authorized Rule 10b5-1 trading plans, or otherwise in accordance with applicable federal securities laws, including pursuant to Rule 10b-18 under the Exchange Act. Management’s decision to repurchase shares of common stock will depend on a number of factors, such as general market and economic conditions, the trading price of the common stock, alternative uses for capital, the Company’s financial performance, and corporate and regulatory requirements

(2)Stock repurchases were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants of the Company’s 2015 Equity and Incentive Plan.

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