First Interstate BancSystem Inc: 10% owner Scott Jonathan R sold 5,000 shares

What happened

• Scott Jonathan R, a 10% owner, sold a total of 5,000 shares of First Interstate BancSystem Inc: 825 shares on Oct 23, 2026 at a weighted average price of $37.00 for $30,525, and 4,175 shares on Oct 26, 2026 at a weighted average price of $37.31 for $155,769, totaling $186,294.

Key details

• Transaction dates and prices:
  • Oct 23, 2026 — sale of 825 shares at weighted average $37.00 (prices ranged $37.00 to $37.01) — $30,525. (Footnote F1)
  • Oct 26, 2026 — sale of 4,175 shares at weighted average $37.31 (prices ranged $37.15 to $37.38) — $155,769. (Footnote F3)
• Shares owned after the transactions:
  • After Oct 23, 2026 sale: 811,913 shares beneficially owned (composition in footnote F2).
  • After Oct 26, 2026 sale: 807,738 shares beneficially owned (composition in footnote F4).
• Footnotes that matter:
  • F1 and F3: reported prices are weighted averages; shares were sold in multiple transactions within the stated price ranges and the reporting person will provide the per-price breakdown on request.
  • F2 and F4: detail how the beneficial ownership is composed among trusts, IXL Limited Liability Company, and the reporting person’s spouse.
  • F5: reporting persons may be deemed members of a group and disclaim beneficial ownership except to the extent of pecuniary interest; future filings will be from Jonathan R. Scott’s perspective.
• Filing timeliness:
  • Form filed on Oct 26, 2026; the filing is not marked as late.

Why it may matter

• Transaction type: these were open-market or private sales (code S), not option exercises, awards, or gifts.
• Insider status: the reporting person is a 10% owner and holds shares through trusts, an LLC, and a spouse.
• This filing does not show why the insider traded or why the company acted.