[144] FIRST INTERSTATE BANCSYSTEM INC SEC Filing

Rhea-AI Filing Summary

Scott family trust filed a Form 144 reporting proposed or completed sales of Common shares of FIBK. The filing lists three transactions: 3,000 shares on 03/26/2026, 53,504 shares on 04/30/2026, and 12,892 shares on 06/04/2026, with gross proceeds shown for each sale. The shares are associated with the Jonathan R. Scott Trust dtd 11/13/2004 and were originally acquired as a gift on 07/01/1989.

Insights

Securities Compliance Analyst

Form 144 lists affiliate sales by a family trust and shows dates, share counts, and gross proceeds.

The filing identifies the Jonathan R. Scott Trust dtd 11/13/2004 as the selling holder and provides sale dates and proceeds for three trades in 2026. Rule 144 notices are procedural disclosures for affiliate transactions and do not in themselves change company fundamentals.

Cash‑flow treatment and whether the trades were effected under Rule 144 conditions are not stated here; subsequent filings or broker confirmations would show settlement details.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	13890	495039.6	97142879	06/17/2026	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	07/01/1989	Acquired as a gift	Scott Family Member		02/15/1972	13890	07/01/1989	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	03/26/2026	3000	100348.2
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	04/30/2026	53504	1895186.59
Jonathan R. Scott Trust dtd 11/13/2004 401 North 31st Street Billings MT 59101	Common	06/04/2026	12892	458754.08

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)