First Interstate BancSystem 10% Owner Jonathan R. Scott Reports Sale of 5,000 Common Shares for $186,294.25

• First Interstate BancSystem 10% owner Jonathan R. Scott sold 5,000 common shares, reducing his indirect beneficial ownership to 807,738 shares.
• The October 23, 2026, sale involved 825 shares at $37 per share.
• A further 4,175 shares were sold October 26, 2026, at $37.31 per share.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. First Interstate BancSystem Inc. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001493152-26-048502), on October 26, 2026, and is solely responsible for the information contained therein.