<SEC-DOCUMENT>0001214659-21-012036.txt : 20211118
<SEC-HEADER>0001214659-21-012036.hdr.sgml : 20211118
<ACCEPTANCE-DATETIME>20211118191936
ACCESSION NUMBER:		0001214659-21-012036
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20211117
FILED AS OF DATE:		20211118
DATE AS OF CHANGE:		20211118

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			COPELAND REX A
		CENTRAL INDEX KEY:			0001108323
		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-18082
		FILM NUMBER:		211426025

	MAIL ADDRESS:	
		STREET 1:		4901 S. BOTHWELL
		CITY:			SPRINGFIELD
		STATE:			MO
		ZIP:			65804

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GREAT SOUTHERN BANCORP, INC.
		CENTRAL INDEX KEY:			0000854560
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				431524856
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1451 E BATTLEFIELD
		CITY:			SPRINGFIELD
		STATE:			MO
		ZIP:			65804
		BUSINESS PHONE:		417-887-4400

	MAIL ADDRESS:	
		STREET 1:		P O BOX 9009
		CITY:			SPRINGFIELD
		STATE:			MO
		ZIP:			65808-9009

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GREAT SOUTHERN BANCORP INC
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>marketforms-54340.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
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<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-11-17</periodOfReport>

    <issuer>
        <issuerCik>0000854560</issuerCik>
        <issuerName>GREAT SOUTHERN BANCORP, INC.</issuerName>
        <issuerTradingSymbol>GSBC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001108323</rptOwnerCik>
            <rptOwnerName>COPELAND REX A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>CARE OF GREAT SOUTHERN BANK</rptOwnerStreet1>
            <rptOwnerStreet2>218 S. GLENSTONE AVE</rptOwnerStreet2>
            <rptOwnerCity>SPRINGFIELD</rptOwnerCity>
            <rptOwnerState>MO</rptOwnerState>
            <rptOwnerZipCode>65802</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>true</isOther>
            <officerTitle>Treasurer</officerTitle>
            <otherText>Senior Vice Pres of Subsidiary</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common stock</value>
            </securityTitle>
            <postTransactionAmounts>
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                    <value>23318</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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            <transactionDate>
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                <equitySwapInvolved>false</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
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                <transactionPricePerShare>
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            </transactionAmounts>
            <exerciseDate>
                <value>2025-11-17</value>
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            <expirationDate>
                <value>2031-11-17</value>
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                <underlyingSecurityTitle>
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                <sharesOwnedFollowingTransaction>
                    <value>3563</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Option to purchase</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>57.98</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-11-17</value>
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            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1187</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>57.98</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <exerciseDate>
                <value>2026-11-17</value>
            </exerciseDate>
            <expirationDate>
                <value>2031-11-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1187</value>
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            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4750</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeHolding>
            <securityTitle>
                <value>Option to purchase</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <exerciseDate>
                <footnoteId id="F1"/>
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            <expirationDate>
                <value>2024-10-15</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4200</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8950</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Option to purchase</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>50.71</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
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            <expirationDate>
                <value>2025-11-18</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4200</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>13150</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        <derivativeHolding>
            <securityTitle>
                <value>Option to purchase</value>
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            <conversionOrExercisePrice>
                <value>41.3</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F3"/>
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            <expirationDate>
                <value>2026-10-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4200</value>
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                <sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
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        <derivativeHolding>
            <securityTitle>
                <value>Option to purchase</value>
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            <conversionOrExercisePrice>
                <value>52.2</value>
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            <exerciseDate>
                <footnoteId id="F4"/>
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            <expirationDate>
                <value>2027-11-15</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4200</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>21550</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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            <securityTitle>
                <value>Option to purchase</value>
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            <conversionOrExercisePrice>
                <value>55</value>
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            <exerciseDate>
                <footnoteId id="F5"/>
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            <expirationDate>
                <value>2028-11-28</value>
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                <sharesOwnedFollowingTransaction>
                    <value>25750</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </derivativeHolding>
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            <securityTitle>
                <value>Option to purchase</value>
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            <exerciseDate>
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            <expirationDate>
                <value>2029-11-20</value>
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            <underlyingSecurity>
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                <underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>29950</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Option to purchase</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>41.74</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F7"/>
            </exerciseDate>
            <expirationDate>
                <value>2030-10-26</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>34450</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">1,050 shares vest on 10/15/2016, 10/15/2017, 10/15/2018 and 10/15/2019</footnote>
        <footnote id="F2">1,050 shares vest on 11/18/2017, 11/18/2018, 11/18/2019 and 11/18/2020</footnote>
        <footnote id="F3">1,050 shares vest on 10/24/2018, 10/24/2019, 10/24/2020 and 10/24/2021</footnote>
        <footnote id="F4">1,050 shares vest on 11/15/2019, 11/15/2020, 11/15/2021 and 11/15/2022</footnote>
        <footnote id="F5">1,050 shares vest on 11/28/2020, 11/28/2021, 11/28/2022 and 11/28/2023</footnote>
        <footnote id="F6">1,050 shares vest on 11/20/2021, 11/20/2022, 11/20/2023 and 11/20/2024</footnote>
        <footnote id="F7">1,125 shares vest on 10/26/2022, 10/26/2023, 10/26/2024 and 10/26/2025</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Matt Snyder, Attorney-in-fact for Rex A. Copeland</signatureName>
        <signatureDate>2021-11-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
