SCHEDULE 13G/A Filing by The Vanguard Group for First Interstate BancSystem Inc

This filing details a Schedule 13G/A amendment concerning First Interstate BancSystem Inc. (FIBK) by The Vanguard Group, Inc. As of March 5, 2026, Vanguard holds 10,119,518 shares, representing 10.0% ownership, a slight decrease from the previous 9.76% ownership. The total value of the holding is $355,802,252.88. The filing indicates that Vanguard acts as an investment adviser, and its clients, including investment companies and managed accounts, have the right to receive or the power to direct the receipt of dividends or proceeds from the sale of these securities. The filing also notes an internal realignment within The Vanguard Group, Inc. as of January 12, 2026, which may lead to separate reporting of beneficial ownership by certain subsidiaries.