John M. Heyneman Jr. - 01 Jun 2026 Form 4 Insider Report for FIRST INTERSTATE BANCSYSTEM INC (FIBK)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: FIBK
Reported as of: 01 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 03 Jun 2026, 13:45:24 UTC
Prior SEC filing: 25 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Kirk D. Jensen, Attorney-in-Fact for Reporting Person

Key filing fact

John M. Heyneman Jr. filed Form 4 for FIRST INTERSTATE BANCSYSTEM INC (FIBK) on 03 Jun 2026.

Key facts

This page summarizes John M. Heyneman Jr.'s Form 4 filing for FIRST INTERSTATE BANCSYSTEM INC (FIBK).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 03 Jun 2026, 13:45.

Change

Previous filing in this sequence was filed on 25 Nov 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001198518 Primary reporting owner

HEYNEMAN JOHN M JR

Relationship: Director, 10%+ Owner
Address: P.O. BOX 30918, BILLINGS
Signature: /s/ Kirk D. Jensen, Attorney-in-Fact for Reporting Person
Signature date: 03 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

FIBK transaction

Common Stock

Award

Transaction value
Shares: +2,247
Change %: +43%
Price: $0.000000^*
Shares after: 7,471
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F1

FIBK holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 1,414,636
Date: 01 Jun 2026
Ownership: see footnote
Footnotes: F2, F3

FIBK holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 47,482
Date: 01 Jun 2026
Ownership: By Awe' LLC

FIBK holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 30,154
Date: 01 Jun 2026
Ownership: By Bench Ranch LLC

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Shares issuable upon vesting of restricted stock units granted to the reporting person pursuant to the Registrant's 2023 Equity and Incentive Plan. The restricted stock units vest on June 1, 2027, subject to the reporting person's provision of continuous service to the Registrant through the earlier of the applicable vesting date or the date of the Registrant's next annual shareholder meeting.

Footnote F2

As a result of certain agreements entered into by and among the reporting persons, the Issuer, and certain other stockholders of the Issuer, the reporting persons may be deemed members of a group with the other signatories thereto and may be deemed to share beneficial ownership of the securities reported herein. Each of the reporting persons disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein. The reporting persons expect to file future Forms 4 and 5, if any, together with John Heyneman, Jr. with the indication of direct or indirect ownership in Table I being made from John Heyneman, Jr.'s perspective. The nature of beneficial ownership is described in detail by footnote for all reporting persons.

Footnote F3

Composed of 150,000 shares held of record by John M Heyneman Jr. Trust, 85,836 shares held of record by Riki Rae Scott Davidson & John Heyneman Jr., Trustees FBO Riki Scott Davidson Exemption Trust Under the Scott Family 1996 Trust, 85,836 shares held of record by Rae Ann Morss & John Heyneman Jr., Trustees FBO Rae Ann Morss Exemption Trust Under the Scott Family 1996 Trust, 1,085,792 shares held of record by Towanda Investments Limited Partnership, 4,552 shares held of record by John Heyneman, Jr.'s spouse, 1095 shares held of record by John Heyneman, Jr.'s daughter, 1,215 shares held of record by John Heyneman, Jr.'s son Quinn, and 310 shares held of record by John Heyneman, Jr.'s son Bae-John.