First Interstate trust plans $384K share sale

The notice also lists earlier common-share sales by the trust during September and October 2026.

Available on EDGAR 11/09/2026 - 06:13 PM EST Accepted by SEC EDGAR 11/09/2026 - 06:13 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

First Interstate BancSystem, Inc. is named as issuer in a notice listing the Jonathan R. Scott Trust dated November 13, 2004, as planning to sell 10,000 common shares for an aggregate market value of $384,200; the approximate sale date is November 9, 2026. The notice lists the seller’s relationship to the issuer as former director. It states the shares were acquired as a gift from a Scott Family Member on January 2, 1976.

Key Figures

Shares planned for sale: 10,000 shares Aggregate market value: $384,200 Prior shares sold: 16,929 shares +4 more

7 metrics

Shares planned for sale 10,000 shares Approximate sale date November 9, 2026

Aggregate market value $384,200 Shares planned for sale

Prior shares sold 16,929 shares September 11, 2026

Prior shares sold 8,071 shares September 14, 2026

Prior shares sold 5,000 shares October 22, 2026

Prior shares sold 825 shares October 23, 2026

Prior shares sold 4,175 shares October 26, 2026

Key Terms

Aggregate Market Value, Gross Proceeds, Number of Shares or Other Units Outstanding

3 terms

Aggregate Market Value financial

"Aggregate Market Value"

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.

Gross Proceeds financial

"Gross Proceeds"

The total amount of cash a company receives from a financing event or sale before any fees, expenses, taxes or deductions are taken out. Investors watch gross proceeds because it shows the raw scale of new capital being raised—think of it as the paycheck amount before withholdings—which helps assess how much funding is available for operations, growth, debt payoff or how much shareholder dilution might occur once costs are removed.

Number of Shares or Other Units Outstanding financial

"Number of Shares or Other Units Outstanding"

FAQ

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

How many FIBK shares does the trust plan to sell?

The Jonathan R. Scott Trust dated November 13, 2004, plans to sell 10,000 common shares, with an aggregate market value of $384,200 and an approximate sale date of November 9, 2026.

What prior FIBK share sales did the trust report?

The trust reported sales of 16,929 shares for gross proceeds of $626,902.88 on September 11, 2026; 8,071 shares for $300,994.22 on September 14; 5,000 shares for $184,505.5 on October 22; 825 shares for $30,525.49 on October 23; and 4,175 shares for $155,756.73 on October 26.

How did the trust acquire the FIBK shares it plans to sell?

The 10,000 shares were acquired as a gift from a Scott Family Member on January 2, 1976.

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	1-406-255-5322
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	384200	92581035	11/09/2026	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	01/02/1976	Acquired as a gift	Scott Family Member		01/02/1976	10000	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
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	10/22/2026	5000	184505.5
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	10/23/2026	825	30525.49
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	10/26/2026	4175	155756.73

144: Remarks and Signature

Remarks
Date of Notice	11/09/2026
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)