Harper Grace Scott Trust 4

What Happened
Jonathan R. Scott, identified as a 10% owner of First Interstate BancSystem, Inc. (FIBK), sold 12,892 shares in an open-market transaction on June 4, 2026. The reported weighted-average price was $35.58 per share, for total proceeds of approximately $458,697. The filing indicates the shares were sold in multiple transactions at prices ranging from $35.43 to $35.74.

Key Details

• Transaction date: 2026-06-04 (open-market sale; transaction code S).
• Price: weighted average $35.58; trade range $35.43–$35.74 (multiple trades).
• Proceeds: ~ $458,697.
• Shares owned after transaction: approximately 853,736 shares (file lists 866,628 shares held of record across related vehicles prior to the sale; 866,628 − 12,892 = 853,736).
• Footnotes: F1 notes the weighted-average price and availability of per-trade price details on request; F2 breaks down record holdings by trusts and entities; F3 notes potential group beneficial-ownership arrangements and a disclaimer of beneficial ownership except for pecuniary interest.
• Filing timeliness: Reported with the same report date (2026-06-04); no late filing indicated in the Form 4.

Context
This was an open-market sale by a large (10%) shareholder rather than a routine executive stock grant or option exercise. Such sales can reflect portfolio moves or liquidity needs and do not necessarily indicate a change in company fundamentals. The filing’s footnotes indicate shared/group ownership considerations, so reported ownership reflects holdings across several trusts and entities.