First Interstate: Scott Trust proposes $369K share sale

The notice also reports two earlier sales by the trust: 8,071 shares on September 14 and 16,929 shares on September 11, 2026.

Rhea-AI Filing Summary

First Interstate BancSystem, Inc. (FIBK) is the issuer named in a Form 144 notice for the Jonathan R. Scott Trust’s proposed sale of 10,000 common shares. The notice lists an aggregate market value of $368,800 and an approximate sale date of October 22, 2026. It lists the seller’s relationship to the issuer as “Former Director”; Goldman Sachs & Co. LLC signed on the trust’s behalf.

The notice also reports earlier sales by the trust of 8,071 shares on September 14, 2026, and 16,929 shares on September 11, 2026.

Key Figures

Proposed common shares to be sold: 10,000 shares Aggregate market value of proposed sale: $368,800 Shares outstanding: 95,304,607 shares +2 more

5 metrics

Proposed common shares to be sold 10,000 shares Approximate sale date: October 22, 2026

Aggregate market value of proposed sale $368,800 Proposed common-share sale

Shares outstanding 95,304,607 shares Listed in the securities information

Earlier shares sold 8,071 shares September 14, 2026; aggregate market value $300,994.22

Earlier shares sold 16,929 shares September 11, 2026; aggregate market value $626,902.88

Key Terms

Rule 144, aggregated, Acquired as a gift

3 terms

Rule 144 regulatory

"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.

aggregated regulatory

"required by paragraph (e) of Rule 144 to be aggregated"

Acquired as a gift financial

"Acquired as a gift"

FAQ

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

How many FIBK shares does the Jonathan R. Scott Trust propose to sell?

The notice reports a proposed sale of 10,000 common shares for the account of the Jonathan R. Scott Trust dated November 13, 2004. It lists an aggregate market value of $368,800 and an approximate sale date of October 22, 2026.

What earlier FIBK share sales does the notice list for the trust?

The trust’s earlier reported sales were 8,071 shares for an aggregate market value of $300,994.22 on September 14, 2026, and 16,929 shares for $626,902.88 on September 11, 2026. They are listed under sales during the past three months.

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

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Available on EDGAR 10/22/2026 - 06:59 PM EDT Accepted by SEC EDGAR 10/22/2026 - 06:58 PM EDT Learn about SEC filing dates

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	10000	368800	95304607	10/22/2026	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	5145	11/03/1983	None
Common	01/02/1976	Acquired as a gift	Scott Family Member		01/02/1976	4855	01/02/1976	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	09/14/2026	8071	300994.22
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	09/11/2026	16929	626902.88

144: Remarks and Signature

Remarks
Date of Notice	10/22/2026
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)