First Interstate trust to sell 15,000 shares

A trust associated with a former director of FIBK has filed a Rule 144 notice to sell 15,000 additional common shares after several recent sales.

Available on EDGAR 09/11/2026 - 06:53 PM EDT Accepted by SEC EDGAR 09/11/2026 - 06:53 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

FIRST INTERSTATE BANCSYSTEM INC (FIBK) is the issuer for a planned Rule 144 sale of common stock by the Jonathan R. Scott Trust dated November 13, 2004, which is associated with a former director.

The trust has filed to sell 15,000 shares of FIBK common stock through Goldman Sachs & Co. LLC, with an aggregate market value of $553,800, in a transaction dated September 11, 2026 on the NASD market. The filing also lists prior Rule 144 sales of FIBK common stock by the trust over the past three months.

Key Figures

Shares planned for sale: 15,000 shares of common stock Aggregate market value of planned sale: $553,800 Recent sale on July 17, 2026: 10,000 shares for $402,988 +4 more

7 metrics

Shares planned for sale 15,000 shares of common stock Planned Rule 144 sale by Jonathan R. Scott Trust through Goldman Sachs & Co. LLC

Aggregate market value of planned sale $553,800 Estimated value of 15,000 FIBK shares to be sold

Recent sale on July 17, 2026 10,000 shares for $402,988 FIBK common stock sold by the Jonathan R. Scott Trust in past three months

Recent sale on June 17, 2026 4,500 shares for $163,314 FIBK common stock sold by the Jonathan R. Scott Trust in past three months

Recent sale on June 18, 2026 9,390 shares for $339,044.73 FIBK common stock sold by the Jonathan R. Scott Trust in past three months

Recent sale on September 11, 2026 10,000 shares for $370,313 FIBK common stock sold by the Jonathan R. Scott Trust in past three months

Original acquisition date November 3, 1983 Shares acquired as a gift from a Scott family member

Key Terms

Rule 144, aggregate market value, Former Director

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

aggregate market value financial

"Common | Goldman Sachs & Co. LLC ... | 15000 | 553800 |"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Former Director regulatory

"Former Director 144: Securities Information"

FAQ

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

What Rule 144 sale involving FIBK is the Jonathan R. Scott Trust planning?

The Jonathan R. Scott Trust dated November 13, 2004 plans to sell 15,000 shares of First Interstate BancSystem, Inc. (FIBK) common stock under Rule 144. The shares are to be sold through Goldman Sachs & Co. LLC with an aggregate market value of $553,800 as of the filing.

Who is the selling security holder in this FIBK Form 144 filing?

The selling security holder is the Jonathan R. Scott Trust dated 11/13/2004, associated with a former director of First Interstate BancSystem, Inc. The trust is the account for which the FIBK common stock is to be sold under Rule 144.

Which broker will handle the planned FIBK share sale under this Form 144?

The planned Rule 144 sale of FIBK common stock will be handled by Goldman Sachs & Co. LLC, located at 200 West Street, New York, NY 10282. The filing lists this broker for the 15,000 shares to be sold.

What prior FIBK share sales has the Jonathan R. Scott Trust reported in the past three months?

The trust reports prior sales of FIBK common stock of 10,000 shares for $402,988 on July 17, 2026, 4,500 shares for $163,314 on June 17, 2026, 9,390 shares for $339,044.73 on June 18, 2026, and 10,000 shares for $370,313 on September 11, 2026.

How were the FIBK shares originally acquired by the Jonathan R. Scott Trust?

The FIBK common shares listed in the Form 144 were originally acquired as a gift, with an acquisition date of November 3, 1983, from a Scott family member according to the securities-to-be-sold section.

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

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001908962
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	First Interstate BancSystem, Inc.
SEC File Number	001-34653
Address of Issuer	401 North 31st Street Billings MONTANA 59101
Phone	1-406-255-5311
Name of Person for Whose Account the Securities are To Be Sold	Jonathan R. Scott Trust dtd 11/13/2004
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Former Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Goldman Sachs & Co. LLC 200 West Street New York NY 10282	15000	553800	95304607	09/11/2026	NASD

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	11/03/1983	Acquired as a gift	Scott Family Member		02/15/1972	15000	11/03/1983	None

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	07/17/2026	10000	402988
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	06/17/2026	4500	163314
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	06/18/2026	9390	339044.73
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	09/11/2026	10000	370313

144: Remarks and Signature

Remarks
Date of Notice	09/11/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Goldman Sachs & Co. LLC on behalf of Jonathan R. Scott Trust dtd 11/13/2004
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)