Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002 4

What Happened
Julie A. Scott (reported as SCOTT JULIE A), a 10% owner of First Interstate BancSystem, sold a total of 15,000 shares in three open-market transactions on June 18, 2026. She sold 5,000 shares at $35.95 (proceeds $179,750), 5,000 shares at $35.98 (proceeds $179,900), and 5,000 shares at $35.97 (proceeds $179,850), for total gross proceeds of $539,500. These were outright sales (transaction code S), not purchases or option exercises.

Key Details

• Transaction date: 2026-06-18. Prices: $35.95, $35.98, $35.97. Total shares sold: 15,000; total proceeds: $539,500.
• Shares owned after transactions: 488,359 shares (per filing footnote showing post-sale holdings composition).
• Holdings are held across trusts and IXL LLC (footnotes F1–F3) and indicate shared voting/dispositive power with a sibling.
• Footnote F4 notes certain group agreements and a disclaimer of beneficial ownership except for pecuniary interest; the reporting persons may file future Forms 4/5 together with Julie Scott Rose.
• Filing date / report period: 2026-06-18 (form appears timely). No 10b5‑1 plan, option exercise, or tax‑withholding notation was disclosed.

Context
This filing records open‑market sales by a 10% owner — different from routine insider buys by executives. Sales by large shareholders can reflect portfolio, estate, or tax planning and are not by themselves evidence of company performance. The filing is factual; it does not state the reason for the sales.