<SEC-DOCUMENT>0001958244-25-004385.txt : 20251008
<SEC-HEADER>0001958244-25-004385.hdr.sgml : 20251008
<ACCEPTANCE-DATETIME>20251008161140
ACCESSION NUMBER:		0001958244-25-004385
CONFORMED SUBMISSION TYPE:	144/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20251008
DATE AS OF CHANGE:		20251008

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FIRST INTERSTATE BANCSYSTEM INC
		CENTRAL INDEX KEY:			0000860413
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		ORGANIZATION NAME:           	02 Finance
		EIN:				810331430
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-34653
		FILM NUMBER:		251382430

	BUSINESS ADDRESS:	
		STREET 1:		401 NO 31ST STREET
		CITY:			BILLINGS
		STATE:			MT
		ZIP:			59101
		BUSINESS PHONE:		4062555311

	MAIL ADDRESS:	
		STREET 1:		401 NO 31ST STREET
		CITY:			BILLINGS
		STATE:			MT
		ZIP:			59101

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST INTERSTATE BANCSYSTEM OF MONTANA INC
		DATE OF NAME CHANGE:	19930615

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04
		CENTRAL INDEX KEY:			0001908962
		ORGANIZATION NAME:           	
		EIN:				000000000
		STATE OF INCORPORATION:			WY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144/A

	BUSINESS ADDRESS:	
		STREET 1:		BOX 190
		CITY:			DAYTON
		STATE:			WY
		ZIP:			82836
		BUSINESS PHONE:		307-752-5605

	MAIL ADDRESS:	
		STREET 1:		BOX 190
		CITY:			DAYTON
		STATE:			WY
		ZIP:			82836
</SEC-HEADER>
<DOCUMENT>
<TYPE>144/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><ns2:edgarSubmission xmlns:com="http://www.sec.gov/edgar/common" xmlns:ns2="http://www.sec.gov/edgar/ownership">
    <ns2:headerData>
        <ns2:submissionType>144/A</ns2:submissionType>
        <ns2:previousAccessionNumber>0001958244-25-004382</ns2:previousAccessionNumber>
        <ns2:filerInfo>
            <ns2:filer>
                <ns2:filerCredentials>
                    <ns2:cik>0001908962</ns2:cik>
                    <ns2:ccc>XXXXXXXX</ns2:ccc>
                </ns2:filerCredentials>
            </ns2:filer>
            <ns2:liveTestFlag>LIVE</ns2:liveTestFlag>



        </ns2:filerInfo>
    </ns2:headerData>
    <ns2:formData>
        <ns2:issuerInfo>
            <ns2:issuerCik>0000860413</ns2:issuerCik>
            <ns2:issuerName>First Interstate BancSystem, Inc.</ns2:issuerName>
            <ns2:secFileNumber>001-34653</ns2:secFileNumber>
            <ns2:issuerAddress>
                <com:street1>401 North 31st Street</com:street1>
                <com:city>Billings</com:city>
                <com:stateOrCountry>MT</com:stateOrCountry>
                <com:zipCode>59101</com:zipCode>
            </ns2:issuerAddress>
            <ns2:issuerContactPhone>1-406-255-5311</ns2:issuerContactPhone>
            <ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Jonathan R. Scott Trust dtd 11/13/2004</ns2:nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <ns2:relationshipsToIssuer>
                <ns2:relationshipToIssuer>Former Director</ns2:relationshipToIssuer>
            </ns2:relationshipsToIssuer>
        </ns2:issuerInfo>
        <ns2:securitiesInformation>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:brokerOrMarketmakerDetails>
                <ns2:name>Goldman Sachs &amp; Co. LLC</ns2:name>
                <ns2:address>
                    <com:street1>200 West Street</com:street1>
                    <com:city>New York</com:city>
                    <com:stateOrCountry>NY</com:stateOrCountry>
                    <com:zipCode>10282</com:zipCode>
                </ns2:address>
            </ns2:brokerOrMarketmakerDetails>
            <ns2:noOfUnitsSold>20000</ns2:noOfUnitsSold>
            <ns2:aggregateMarketValue>636800</ns2:aggregateMarketValue>
            <ns2:noOfUnitsOutstanding>104509863</ns2:noOfUnitsOutstanding>
            <ns2:approxSaleDate>10/07/2025</ns2:approxSaleDate>
            <ns2:securitiesExchangeName>NASD</ns2:securitiesExchangeName>
        </ns2:securitiesInformation>
        <ns2:securitiesToBeSold>
            <ns2:securitiesClassTitle>Common</ns2:securitiesClassTitle>
            <ns2:acquiredDate>06/20/2020</ns2:acquiredDate>
            <ns2:natureOfAcquisitionTransaction>Gift</ns2:natureOfAcquisitionTransaction>
            <ns2:nameOfPersonfromWhomAcquired>Scott Family Member</ns2:nameOfPersonfromWhomAcquired>
            <ns2:isGiftTransaction>Y</ns2:isGiftTransaction>
            <ns2:donarAcquiredDate>11/03/1993</ns2:donarAcquiredDate>
            <ns2:amountOfSecuritiesAcquired>20000</ns2:amountOfSecuritiesAcquired>
            <ns2:paymentDate>06/20/2020</ns2:paymentDate>
            <ns2:natureOfPayment>None</ns2:natureOfPayment>
        </ns2:securitiesToBeSold>
        <ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</ns2:nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <ns2:remarks>Amendment to the filing submitted on 10/7/2025 in order to amend Relationship to Issuer.</ns2:remarks>
        <ns2:noticeSignature>
            <ns2:noticeDate>10/08/2025</ns2:noticeDate>
            <ns2:planAdoptionDates/>
            <ns2:signature>Goldman Sachs &amp; Co. LLC on behalf of Jonathan R. Scott Trust dtd 11/13/2004</ns2:signature>
        </ns2:noticeSignature>
    </ns2:formData>
</ns2:edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
