Harper Grace Scott Trust 4

What Happened
Jonathan R. Scott, reported as a 10% owner of First Interstate BancSystem, Inc. (FIBK), sold 4,500 shares in an open-market transaction on June 17, 2026. The weighted-average sale price was $36.29 per share, for total proceeds of approximately $163,305. The shares were sold in multiple trades at prices ranging from $36.01 to $36.45.

Key Details

• Transaction date: 2026-06-17 (filed on 2026-06-18); appears to have been reported promptly the next day.
• Transaction type/code: Sale (S) — open market/private sale.
• Price: weighted average $36.29; per-footnote range $36.01–$36.45. Reporting person can provide the breakdown of individual trade prices on request (Footnote F1).
• Shares sold: 4,500; Proceeds ≈ $163,305.
• Reported beneficial holdings (per footnote F2): a total of 862,128 shares held of record across various trusts and entities (breakdown in footnote F2).
• Group/ownership note (Footnote F3): Reporting persons may be deemed part of a group with others and disclaim beneficial ownership except to the extent of pecuniary interest; future filings may consolidate reporting from Jonathan R. Scott’s perspective.

Context

• This was a sale by a large (10%) shareholder rather than an employee option exercise or grant; such sales can be routine (liquidity, portfolio management) and do not necessarily indicate a change in company outlook.
• No options, awards, or tax-withholding events are reported in this filing.