First Interstate BancSystem (FIBK) Proxy filing summary

Executive summary

• Annual meeting scheduled for May 27, 2026, at 4:00 p.m. Mountain Time in Billings, MT.

• Shareholders can access proxy materials online or request them by mail or email.

• Voting instructions are available online, by phone, or in person at the meeting.

Voting matters and shareholder proposals

• Election of three Class II director nominees: Alice S. Cho, Dennis L. Johnson, and Daniel A. Rykhus.

• Proposal to amend the Certificate of Incorporation for plurality voting in contested director elections.

• Advisory vote on executive compensation (say-on-pay) included.

• Ratification of Ernst & Young LLP as independent auditor for the year ending December 31, 2026.

• Proxies may vote on other business as permitted by law.

Board of directors and corporate governance

• Board recommends voting FOR all director nominees and all other proposals.