First Interstate director Scott sells 3,108 shares

The 1,952,320 indirectly held shares are recorded through two trusts and J.S. Investments Limited Partnership, subject to a beneficial-ownership disclaimer.

Available on EDGAR 11/03/2026 - 01:23 PM EST Accepted by SEC EDGAR 11/03/2026 - 01:22 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

First Interstate BancSystem Inc. (FIBK) director and ten percent owner James R. Scott Jr. reported direct sales of 3,108 common shares on November 2, 2026, at $38.00 per share, and 50 shares on October 30, 2026, at $38.25 per share. No Rule 10b5-1 plan is reported. The indirect holding entry lists 1,952,320 shares as of October 30, 2026, held of record for two GST Exempt Trusts and by J.S. Investments Limited Partnership; the reporting persons disclaim beneficial ownership except to the extent of their pecuniary interests.

Insider Trade Summary

Net Seller: 3,158 shares

Net Sell 2 txns

Insider Scott James R. Jr

Role Director, 10% Owner

Sold 3,158 shs ($120K)

Type	Security	Shares	Price	Value
Sale	Common Stock	3,108	$38.00	$118K
Sale	Common Stock	50	$38.25	$2K
Holding	Common Stock F1, F2	--	--	--

Holdings After Transaction: Common Stock — 77,634 shares (Direct); Common Stock — 1,952,320 shares (Indirect, see footnote)

Footnotes (2)

1. F1. Comprised of 25,642 shares held of record by First Interstate Bank TTEE for Dana S Andersson GST Exempt Trust No 1 Dtd 12/11/2020 and 25,642 shares held of record by First Interstate Bank TTEE for James R Scott Jr. GST Exempt Trust No 1 Dtd 12/11/2020, and 1,901,036 shares held of record by J.S. Investments Limited Partnership.
2. 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 James R. Scott, Jr. with the indication of direct or indirect ownership in Tables I and II being made from James R. Scott Jr.'s perspective unless expressly noted otherwise by footnote. The nature of beneficial ownership is described in detail by footnote for all reporting persons.

Key Figures

Shares sold: 3,108 shares Sale price per share: $38.00 per share Shares sold: 50 shares +5 more

8 metrics

Shares sold 3,108 shares Direct sale on November 2, 2026.

Sale price per share $38.00 per share Direct sale on November 2, 2026.

Shares sold 50 shares Direct sale on October 30, 2026.

Sale price per share $38.25 per share Direct sale on October 30, 2026.

Indirect shares listed 1,952,320 shares Holding entry dated October 30, 2026; the reporting persons disclaim beneficial ownership except to the extent of their pecuniary interests.

Shares held for Dana S Andersson GST Exempt Trust No 1 25,642 shares Held of record by First Interstate Bank TTEE; October 30, 2026 holding.

Shares held for James R Scott Jr. GST Exempt Trust No 1 25,642 shares Held of record by First Interstate Bank TTEE; October 30, 2026 holding.

Shares held by J.S. Investments Limited Partnership 1,901,036 shares October 30, 2026 holding.

Key Terms

beneficial ownership, pecuniary interest, held of record

3 terms

beneficial ownership financial

"disclaims beneficial ownership of any such securities"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"except to the extent of its pecuniary interest therein"

held of record technical

"shares held of record by First Interstate Bank TTEE"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many FIBK shares did James R. Scott Jr. sell, and at what prices?

James R. Scott Jr. reported direct sales of 3,108 FIBK common shares on November 2, 2026, at $38.00 per share, and 50 shares on October 30, 2026, at $38.25 per share. No Rule 10b5-1 plan is reported.

What indirect FIBK shareholding was reported?

The indirect holding entry lists 1,952,320 shares as of October 30, 2026, held of record by First Interstate Bank TTEE for Dana S Andersson GST Exempt Trust No 1 and James R Scott Jr. GST Exempt Trust No 1, and by J.S. Investments Limited Partnership. The reporting persons disclaim beneficial ownership except to the extent of their pecuniary interests.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Scott James R. Jr

(Last) (First) (Middle)

PO BOX 30918

(Street)

BILLINGS MONTANA 59116

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
FIRST INTERSTATE BANCSYSTEM INC [ FIBK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/30/2026		S		50	D	$38.25	80,742	D
Common Stock	11/02/2026		S		3,108	D	$38	77,634	D
Common Stock								1,952,320	I	see footnote(1)(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Comprised of 25,642 shares held of record by First Interstate Bank TTEE for Dana S Andersson GST Exempt Trust No 1 Dtd 12/11/2020 and 25,642 shares held of record by First Interstate Bank TTEE for James R Scott Jr. GST Exempt Trust No 1 Dtd 12/11/2020, and 1,901,036 shares held of record by J.S. Investments Limited Partnership.

2. 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 James R. Scott, Jr. with the indication of direct or indirect ownership in Tables I and II being made from James R. Scott Jr.'s perspective unless expressly noted otherwise by footnote. The nature of beneficial ownership is described in detail by footnote for all reporting persons.

Remarks:

	/s/ Brian M. Murphy, Attorney-in-fact for Reporting Person	11/03/2026
	+/s/ Timothy Leuthold, Attorney-in-Fact for Reporting Person	11/03/2026
	First Interstate Bank TTEE for Dana S Andersson GST Exempt Trust No 1 Dtd 12/11/2020, by: +	11/03/2026
	First Interstate Bank TTEE for James R Scott Jr. GST Exempt Trust No 1 Dtd 12/11/2020, by: +	11/03/2026
	JS Investments Limited Partnership, by: +	11/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)