Form 4: FIBK 10% Owner Trust Reports $32.28 Stock Sale

The Susan Scott Heyneman Trust, a 10% owner of First Interstate Bancsystem Inc., reported the pre-planned sale of 10,000 shares of common stock at $32.28 per share.

Summary

• The Susan Scott Heyneman Trust, along with Susan Heyneman and First Interstate Wealth Management Co-Trustees, reported a transaction involving First Interstate Bancsystem Inc. (FIBK).
• The reporting entity is identified as a 10% owner of FIBK.
• On September 2, 2025, 10,000 shares of FIBK common stock were disposed of (sold) at a price of $32.28 per share.
• Following this transaction, the beneficial ownership of the reporting person stands at 519,256 shares of common stock.
• The transaction was made pursuant to a contract, instruction, or written plan for the purchase or sale of equity securities of the issuer, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Sentiment

Score: 5

Explanation: Neutral. While a 10% owner is reducing their stake, the transaction is explicitly stated to be pursuant to a Rule 10b5-1 plan, indicating a pre-scheduled sale not based on new material non-public information.

Negatives

• The Susan Scott Heyneman Trust, a 10% owner, disposed of 10,000 shares of First Interstate Bancsystem Inc. common stock.

Risks

• The reporting persons may be deemed members of a group with other signatories to certain agreements with the Issuer and other stockholders, potentially sharing beneficial ownership of reported securities.
• Each reporting person disclaims beneficial ownership of such securities, except to the extent of their pecuniary interest.

Future Outlook

The reporting persons expect to file future Forms 4, if any, together with Susan Scott Heyneman, Trust.

Industry Context

This filing reports an insider transaction, which is a routine disclosure for publicly traded companies. The pre-planned nature of the sale via a Rule 10b5-1 plan indicates a structured divestment rather than a reactive market decision based on new material non-public information.

Related Party Transactions

• The reporting persons may be deemed members of a group with other signatories to certain agreements with the Issuer and other stockholders, potentially sharing beneficial ownership of reported securities. Each reporting person disclaims beneficial ownership except for their pecuniary interest.

Stakeholder Impact

• Shareholders may note the reduction in ownership by a significant 10% holder, although the pre-planned nature of the sale under a Rule 10b5-1 plan mitigates immediate concerns about insider sentiment.

Next Steps

• Reporting persons expect to file future Forms 4, if any, together with Susan Scott Heyneman, Trust.

Key Dates

Keywords

FIBK, First Interstate Bancsystem, Form 4, Insider Trading, Beneficial Ownership, Stock Sale, 10b5-1 Plan, Trust, Financial Services