First Interstate BancSystem insider sells 16,929 shares

An insider group linked to a ten percent owner of FIBK sold 16,929 shares and continues to hold 825,809 shares indirectly through multiple trusts and an LLC.

Rhea-AI Filing Summary

FIRST INTERSTATE BANCSYSTEM INC (FIBK) had an insider group associated with Jonathan R. Scott report the sale of 16,929 shares of Common Stock on September 11, 2026, in open-market or private transactions at a weighted average price of $37.03 per share, with prices ranging from $37.00 to $37.23. After this transaction, entities and persons associated with Jonathan R. Scott indirectly held 825,809 shares, including shares held by a trust for Jonathan R. Scott, IXL Limited Liability Company, several Scott family trusts, and Jonathan Scott’s spouse, with beneficial ownership of some securities disclaimed except to the extent of pecuniary interest. No Rule 10b5-1 trading plan is reported for these sales.

Insider Trade Summary

Net Seller: 16,929 shares

Net Sell 1 txn

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 16,929 shs ($627K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2, F3	16,929	$37.03	$627K

Holdings After Transaction: Common Stock — 825,809 shares (Indirect, See Footnote)

Footnotes (3)

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 $37.23. 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 461,271 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. 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: 16,929 shares Weighted average sale price: $37.03 per share Sale price range: $37.00–$37.23 per share +5 more

8 metrics

Shares sold 16,929 shares Common Stock sold on September 11, 2026 by entities associated with Jonathan R. Scott

Weighted average sale price $37.03 per share Average price for the 16,929 shares sold on September 11, 2026

Sale price range $37.00–$37.23 per share Range of prices for multiple sale transactions included in the reported trade

Shares held by Jonathan R Scott Trust 461,271 shares Indirect holdings of FIBK Common Stock by Jonathan Scott as trustee

Shares held by IXL Limited Liability Company 209,678 shares Indirect holdings of FIBK Common Stock through IXL Limited Liability Company

Shares held by each Scott family trust 36,553–36,554 shares Holdings of Holland Elizabeth, Harper Grace, and Harrison William Scott Trusts

Shares held by spouse 45,200 shares FIBK Common Stock held of record by Jonathan Scott’s spouse

Total shares following transaction 825,809 shares Total indirect holdings reported after the September 11, 2026 sale

Key Terms

weighted average price, beneficial ownership, pecuniary interest, ten percent owner

4 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 financial

"may be deemed to share beneficial ownership of the 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

"disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest"

ten percent owner regulatory

"reporting persons are identified as a ten percent owner of the issuer"

FAQ

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

What insider transaction did FIBK report on this Form 4?

An insider group associated with Jonathan R. Scott, a ten percent owner of FIBK, reported the sale of 16,929 shares of Common Stock on September 11, 2026 in an open-market or private transaction.

At what price were the 16,929 FIBK shares sold by the insider group?

The 16,929 FIBK shares were sold at a weighted average price of $37.03 per share, with the individual sale prices ranging from $37.00 to $37.23. The reporting persons state they can provide full price-breakdown details upon request.

How many FIBK shares does the insider group hold after this transaction?

Following the reported sale, entities and persons associated with Jonathan R. Scott indirectly hold 825,809 FIBK shares, including shares held by the Jonathan R Scott Trust, IXL Limited Liability Company, multiple Scott family trusts, and Jonathan Scott’s spouse.

Were the FIBK insider sales made under a Rule 10b5-1 trading plan?

No. The Form 4 indicates that the Rule 10b5-1 checkbox is not selected, and the footnotes do not state that the reported FIBK share sales were made under any Rule 10b5-1 trading plan.

How are the indirect FIBK holdings of the insider group structured?

The indirect FIBK holdings consist of 461,271 shares held by the Jonathan R Scott Trust, 209,678 shares by IXL Limited Liability Company, and 36,553–36,554 shares by each of three Scott family trusts, plus 45,200 shares held by Jonathan Scott’s spouse.

What beneficial ownership disclaimer do the FIBK reporting persons make?

The reporting persons state they may be part of a group with other stockholders and may be deemed to share beneficial ownership of certain FIBK securities, but they disclaim beneficial ownership of those securities except to the extent of their pecuniary interest.

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

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Available on EDGAR 09/14/2026 - 01:32 PM Accepted by SEC EDGAR 09/14/2026 - 01:31 PM 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)
09/11/2026

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	09/11/2026		S		16,929	D	$37.03(1)	825,809	I	See Footnote(2)(3)

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 $37.23. 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 461,271 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. 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: +	09/14/2026
	IXL Limited Liability Company, By: +	09/14/2026
	HOLLAND ELIZABETH SCOTT TRUST, By: +	09/14/2026
	HARPER GRACE SCOTT TRUST, By: +	09/14/2026
	HARRISION WILLIAM SCOTT TRUST, By:+	09/14/2026
	+/s/ Timothy Leuthold. Attorney-in-Fact for Reporting Person	09/14/2026
	** 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)