First Interstate insider sells 2,700 FIBK shares

Rhea-AI Filing Summary

FIRST INTERSTATE BANCSYSTEM INC (FIBK) reported an insider transaction in which an entity associated with ten percent owners linked to Julie A. Scott sold 2,700 shares of common stock on September 16, 2026 at $37.64 per share in an indirect transaction effected by the Julie A Scott Rose Trust. Following this sale, entities associated with the reporting persons held an aggregate of 484,309 indirect shares across several trusts and an LLC, with shared voting and dispositive power noted and certain beneficial ownership expressly disclaimed. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Net Seller: 2,700 shares

Net Sell 1 txn

Insider SCOTT JULIE A, Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002, IXL Ltd Liability Co, Juliana Sarah Scott Rose Trust, Elizabeth Lauren Scott Rose Trust

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

Sold 2,700 shs ($102K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	2,700	$37.64	$102K

Holdings After Transaction: Common Stock — 484,309 shares (Indirect, See Footnote)

Footnotes (2)

1. F1. Composed of 204,166 shares held of record by Julie A Scott-Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-02 (which trust effected the reported sale), 35,233 shares held of record by Juliana Sarah Scott Rose Trust, 35,232 shares held of record by Elizabeth Lauren Scott Rose Trust, and 209,678 shares held by IXL Limited Liability Company, over which Ms. Rose has shared voting and dispositive power with a sibling.
2. F2. As a result of certain agreements entered into among the reporting persons, the Issuer, and 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. The reporting persons disclaim beneficial ownership of any such securities, except to the extent of their pecuniary interests therein. The reporting persons expect to file future Forms 4 and 5, if any, together with Julie Scott Rose with the indication of direct or indirect ownership in Table I and Table II being made from Julie Scott Rose's perspective. The nature of beneficial ownership is described in detail by footnote for all reporting persons.

Key Figures

Shares sold: 2,700 shares Sale price per share: $37.64 per share Total indirect holdings after transaction: 484,309 shares +4 more

7 metrics

Shares sold 2,700 shares Indirect sale of FIBK common stock on September 16, 2026

Sale price per share $37.64 per share Price for the 2,700-share sale of FIBK common stock

Total indirect holdings after transaction 484,309 shares Aggregate FIBK common stock held indirectly by associated entities after the sale

Julie A Scott Rose Trust holdings 204,166 shares FIBK shares held of record by the Julie A Scott Rose Trust after the reported sale

Juliana Sarah Scott Rose Trust holdings 35,233 shares FIBK shares held of record by the Juliana Sarah Scott Rose Trust

Elizabeth Lauren Scott Rose Trust holdings 35,232 shares FIBK shares held of record by the Elizabeth Lauren Scott Rose Trust

IXL Limited Liability Company holdings 209,678 shares FIBK shares held by IXL Limited Liability Company with shared voting and dispositive power

Key Terms

ten percent owner, beneficial ownership, shared voting and dispositive power, group

4 terms

ten percent owner regulatory

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

beneficial ownership regulatory

"may be deemed to share beneficial ownership of the securities reported herein"

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.

shared voting and dispositive power financial

"over which Ms. Rose has shared voting and dispositive power with a sibling"

group regulatory

"may be deemed members of a group with the other signatories thereto"

FAQ

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

What insider transaction was reported for FIBK in this Form 4?

The filing reports an indirect sale of 2,700 shares of FIRST INTERSTATE BANCSYSTEM INC common stock on September 16, 2026 at $37.64 per share, effected by the Julie A Scott Rose Trust.

How many FIBK shares do the reporting persons hold after this transaction?

After the reported sale, entities associated with the reporting persons collectively hold 484,309 shares of FIRST INTERSTATE BANCSYSTEM INC common stock, all reported as indirect ownership through trusts and an LLC.

Which entities hold the FIBK shares reported in this Form 4?

Holdings consist of 204,166 shares in the Julie A Scott Rose Trust, 35,233 shares in the Juliana Sarah Scott Rose Trust, 35,232 shares in the Elizabeth Lauren Scott Rose Trust, and 209,678 shares held by IXL Limited Liability Company.

Does this FIBK Form 4 indicate a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not marked as an affirmative plan, and no footnote states that the 2,700-share sale was made pursuant to a Rule 10b5-1 or other pre-arranged trading plan.

How is beneficial ownership of FIBK shares characterized for the reporting persons?

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

What voting control do the reporting persons have over the IXL LLC FIBK shares?

For the 209,678 shares held by IXL Limited Liability Company, the filing states that Julie Scott Rose has shared voting and dispositive power with a sibling over those securities.

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

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Available on EDGAR 09/16/2026 - 07:04 PM Accepted by SEC EDGAR 09/16/2026 - 07:04 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 JULIE A

(Last) (First) (Middle)

P O 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)
09/16/2026

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	09/16/2026		S		2,700	D	$37.64	484,309	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

1. Name and Address of Reporting Person^*

SCOTT JULIE A

(Last) (First) (Middle)

P O 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^*

Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002

(Last) (First) (Middle)

P O 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)

P O BOX 7113

(Street)

BILLINGS WYOMING 82836

(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^*

Juliana Sarah Scott Rose 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^*

Elizabeth Lauren Scott Rose 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)

Explanation of Responses:

1. Composed of 204,166 shares held of record by Julie A Scott-Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-02 (which trust effected the reported sale), 35,233 shares held of record by Juliana Sarah Scott Rose Trust, 35,232 shares held of record by Elizabeth Lauren Scott Rose Trust, and 209,678 shares held by IXL Limited Liability Company, over which Ms. Rose has shared voting and dispositive power with a sibling.

2. As a result of certain agreements entered into among the reporting persons, the Issuer, and 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. The reporting persons disclaim beneficial ownership of any such securities, except to the extent of their pecuniary interests therein. The reporting persons expect to file future Forms 4 and 5, if any, together with Julie Scott Rose with the indication of direct or indirect ownership in Table I and Table II being made from Julie Scott Rose's perspective. The nature of beneficial ownership is described in detail by footnote for all reporting persons.

	Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002, By: /s/ Timothy J. Leuthold, Attorney-in-Fact for Reporting Person	09/16/2026
	JULIE SCOTT ROSE, By: /s/ Timothy J. Leuthold, Attorney-in-Fact for Reporting Person	09/16/2026
	Juliana Sarah Scott Rose Trust, By: / s/ Timothy J. Leuthold, Attorney-in- Fact for Reporting Person	09/16/2026
	Elizabeth Lauren Scott Rose Trust, By: / s/ Timothy J. Leuthold, Attorney-in- Fact for Reporting Person	09/16/2026
	** 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)