First Interstate owners sell 5,000 shares

Each reporting person disclaims beneficial ownership except to the extent of its pecuniary interest in the reported securities.

Rhea-AI Filing Summary

Reporting persons reported two indirect sales totaling 5,000 shares of First Interstate BancSystem Inc. (FIBK) common stock: 825 shares on October 23, 2026, at a weighted average of $37.00 per share, and 4,175 shares on October 26, 2026, at a weighted average of $37.31. The respective sales occurred in multiple transactions at $37.00–$37.01 and $37.15–$37.38 per share.

The reporting persons, each identified as a ten percent owner, were Jonathan R. Scott; Jonathan Scott as trustee of the Jonathan R. Scott Trust dated April 21, 2004; Harrison William Scott Trust; Harper Grace Scott Trust; Holland Elizabeth Scott Trust; and IXL Ltd Liability Co. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Seller: 5,000 shares

Net Sell 2 txns

Insider Scott Jonathan R, Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04, Harrison William Scott Trust, Harper Grace Scott Trust, Holland Elizabeth Scott Trust, IXL Ltd Liability Co

Role 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner

Sold 5,000 shs ($186K)

Type	Security	Shares	Price	Value
Sale	Common Stock F3, F4, F5	4,175	$37.31	$156K
Sale	Common Stock F1, F2, F5	825	$37.00	$31K

Holdings After Transaction: Common Stock — 807,738 shares (Indirect, See Footnote)

Footnotes (5)

1. F1. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $37.00 to $37.01. The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above.
2. F2. Composed of 447,375 shares held of record by Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04, 209,678 shares held of record by IXL Limited Liability Company, 36,553 shares held of record by Holland Elizabeth Scott Trust, 36,553 sharesheld of record by Harper Grace Scott Trust, 36,554 shares held of record by Harrison William Scott Trust and 45,200 shares held of record by Jonathan Scott's spouse.
3. F3. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $37.15 to $37.38. The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above.
4. F4. Composed of 443,200 shares held of record by Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04, 209,678 shares held of record by IXL Limited Liability Company, 36,553 shares held of record by Holland Elizabeth Scott Trust, 36,553 sharesheld of record by Harper Grace Scott Trust, 36,554 shares held of record by Harrison William Scott Trust and 45,200 shares held of record by Jonathan Scott's spouse.
5. F5. 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 Jonathan R. Scott with the indication of direct or indirect ownership in Table I and Table II being made from Jonathan R. Scott's perspective. The nature of beneficial ownership is described in detail by footnote for all reporting persons.

Key Figures

Shares sold: 5,000 shares Shares sold: 825 shares Weighted-average sale price: $37.00 per share +2 more

5 metrics

Shares sold 5,000 shares Two indirect sales on October 23 and October 26, 2026

Shares sold 825 shares Indirect common-stock sale on October 23, 2026

Weighted-average sale price $37.00 per share October 23, 2026; multiple transactions ranged from $37.00 to $37.01

Shares sold 4,175 shares Indirect common-stock sale on October 26, 2026

Weighted-average sale price $37.31 per share October 26, 2026; multiple transactions ranged from $37.15 to $37.38

Key Terms

weighted average price, beneficial ownership, pecuniary interest

3 terms

weighted average price financial

"The price reported in column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

beneficial ownership regulatory

"Each of the reporting persons disclaims beneficial ownership"

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"

FAQ

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

How many FIBK shares were sold, and at what prices?

Two indirect sales totaled 5,000 shares: 825 shares on October 23, 2026, at a weighted average of $37.00 per share, and 4,175 shares on October 26, 2026, at a weighted average of $37.31. The respective price ranges were $37.00–$37.01 and $37.15–$37.38. No Rule 10b5-1 plan is reported.

What did the FIBK ownership footnotes say about beneficial ownership?

The reporting persons may be deemed to share beneficial ownership with other agreement signatories, and each disclaims beneficial ownership except to the extent of its pecuniary interest. The described holdings include shares held by Jonathan Scott as trustee of the Jonathan R. Scott Trust, IXL Limited Liability Company, the Holland Elizabeth, Harper Grace and Harrison William Scott Trusts, and Jonathan Scott’s spouse.

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

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Available on EDGAR 10/26/2026 - 03:46 PM EDT Accepted by SEC EDGAR 10/26/2026 - 03:45 PM EDT Learn about SEC filing dates

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 Jonathan R

(Last) (First) (Middle)

PO BOX 7113

(Street)

BILLINGS MONTANA 59103

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/23/2026

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

	Form filed by One Reporting Person
X	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	10/23/2026		S		825	D	$37(1)	811,913	I	See Footnote(2)(5)
Common Stock	10/26/2026		S		4,175	D	$37.31(3)	807,738	I	See Footnote(4)(5)

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

1. Name and Address of Reporting Person^*

Scott Jonathan R

(Last) (First) (Middle)

PO BOX 7113

(Street)

BILLINGS MONTANA 59103

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04

(Last) (First) (Middle)

PO BOX 7113

(Street)

BILLINGS MONTANA 59103

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

Harrison William Scott Trust

(Last) (First) (Middle)

PO BOX 7113

(Street)

BILLINGS MONTANA 59103

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

Harper Grace Scott Trust

(Last) (First) (Middle)

PO BOX 7113

(Street)

BILLINGS MONTANA 59103

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

Holland Elizabeth Scott Trust

(Last) (First) (Middle)

PO BOX 7113

(Street)

BILLINGS MONTANA 59103

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

IXL Ltd Liability Co

(Last) (First) (Middle)

PO BOX 7113

(Street)

BILLINGS MONTANA 59103

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

Explanation of Responses:

1. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $37.00 to $37.01. The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above.

2. Composed of 447,375 shares held of record by Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04, 209,678 shares held of record by IXL Limited Liability Company, 36,553 shares held of record by Holland Elizabeth Scott Trust, 36,553 sharesheld of record by Harper Grace Scott Trust, 36,554 shares held of record by Harrison William Scott Trust and 45,200 shares held of record by Jonathan Scott's spouse.

3. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $37.15 to $37.38. The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above.

4. Composed of 443,200 shares held of record by Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04, 209,678 shares held of record by IXL Limited Liability Company, 36,553 shares held of record by Holland Elizabeth Scott Trust, 36,553 sharesheld of record by Harper Grace Scott Trust, 36,554 shares held of record by Harrison William Scott Trust and 45,200 shares held of record by Jonathan Scott's spouse.

5. 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 Jonathan R. Scott with the indication of direct or indirect ownership in Table I and Table II being made from Jonathan R. Scott's perspective. The nature of beneficial ownership is described in detail by footnote for all reporting persons.

	JONATHAN SCOTT AS TRUSTEE OF THE JONATHAN R SCOTT TRUST DATED AS OF 4/21/04, By: +	10/26/2026
	IXL Limited Liability Company, By: +	10/26/2026
	HOLLAND ELIZABETH SCOTT TRUST, By: +	10/26/2026
	HARPER GRACE SCOTT TRUST, By: +	10/26/2026
	HARRISION WILLIAM SCOTT TRUST, By:+	10/26/2026
	+/s/ Timothy Leuthold. Attorney-in-Fact for Reporting Person	10/26/2026
	** 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)