Form 144 reveals planned sale of 615 common shares

A holder of FIBK common stock has filed a notice of proposed sale under Rule 144.

Rhea-AI Filing Summary

A holder of FIBK common stock has filed a notice of proposed sale under Rule 144. The filing covers the planned sale of 615 common shares through Morgan Stanley Smith Barney, with an aggregate market value of $23,142.45, to be sold on the NASDAQ around 02/03/2026. The issuer had 102,890,614 common shares outstanding at the time referenced.

The 615 shares to be sold were originally received in 2016 as gifts from affiliate John Heyneman/John Heyneman Jr. in amounts of 211 and 404 shares. Over the prior three months, related entities Bench Ranch LLC and AWE' LLC sold 15,000 and 20,000 common shares for gross proceeds of $482,162.50 and $641,298.00, respectively. The signer represents they know no undisclosed material adverse information about the issuer’s operations.

FAQ

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What does the Form 144 filing for FIBK disclose?

The Form 144 discloses a planned sale of 615 FIBK common shares under Rule 144. These shares are to be sold through Morgan Stanley Smith Barney on the NASDAQ, with an aggregate market value of $23,142.45 at the time referenced.

How many FIBK shares are being sold and at what market value?

The filing covers a proposed sale of 615 FIBK common shares. The shares have an aggregate market value of $23,142.45, based on the price referenced in the notice, and are intended to be sold on the NASDAQ exchange.

When will the FIBK shares covered by this Form 144 be sold?

The notice lists an approximate sale date of 02/03/2026 for the 615 FIBK common shares. This date reflects when the seller expects to begin sales on the NASDAQ, subject to market conditions and Rule 144 requirements.

How were the 615 FIBK shares proposed for sale originally acquired?

The 615 shares were received as gifts from an affiliate in 2016. Specifically, the holder acquired 211 shares on 08/24/2016 and 404 shares on 09/08/2016 from John Heyneman/John Heyneman Jr. as gift transactions.

What recent FIBK share sales by related entities are disclosed?

The filing lists recent sales by related entities. Bench Ranch LLC sold 15,000 common shares on 11/11/2025 for $482,162.50, and AWE' LLC sold 20,000 common shares on 11/10/2025 for $641,298.00 in gross proceeds.

How many FIBK shares were outstanding at the time of the notice?

The notice states that 102,890,614 FIBK common shares were outstanding. This figure provides context for the relative size of the planned 615‑share sale and the prior sales by related entities listed in the document.

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

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Accepted by SEC EDGAR 02/03/2026 - 04:05 PM EST 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	0001198518
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	(406) 255-5311
Name of Person for Whose Account the Securities are To Be Sold	QUINN T HEYNEMAN
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	Director's son

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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	615	23142.45	102890614	02/03/2026	NASDAQ

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	08/24/2016	Gift from Affiliate	John Heyneman Jr		08/24/2016	211		NA
Common	09/08/2016	Gift from Affiliate	John Heyneman		09/08/2016	404		NA

* 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
Bench Ranch LLC 401 North 31st Street Billings MT 59101	Common	11/11/2025	15000	482162.50
AWE' LLC 401 North 31st Street Billings MT 59101	Common	11/10/2025	20000	641298.00

144: Remarks and Signature

Remarks
Date of Notice	02/03/2026
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	/s/ John M Heyneman Jr
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)