<SEC-DOCUMENT>0000899243-20-031922.txt : 20201123
<SEC-HEADER>0000899243-20-031922.hdr.sgml : 20201123
<ACCEPTANCE-DATETIME>20201123164716
ACCESSION NUMBER:		0000899243-20-031922
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20201119
FILED AS OF DATE:		20201123
DATE AS OF CHANGE:		20201123

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Dallas Jayson Donald Alexander
		CENTRAL INDEX KEY:			0001650322

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39655
		FILM NUMBER:		201338363

	MAIL ADDRESS:	
		STREET 1:		AIMMUNE THERAPEUTICS, INC.
		STREET 2:		8000 MARINA BOULEVARD, SUITE 300
		CITY:			BRISBANE
		STATE:			CA
		ZIP:			94005

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Galecto, Inc.
		CENTRAL INDEX KEY:			0001800315
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				371957007
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		GALECTO BIOTECH AB
		STREET 2:		OLE MAALOES VEJ3
		CITY:			COPENHAGEN
		STATE:			G7
		ZIP:			DK-2200
		BUSINESS PHONE:		45-70-70-52-10

	MAIL ADDRESS:	
		STREET 1:		GALECTO BIOTECH AB
		STREET 2:		OLE MAALOES VEJ3
		CITY:			COPENHAGEN
		STATE:			G7
		ZIP:			DK-2200

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Galecto Inc.
		DATE OF NAME CHANGE:	20200116
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-11-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001800315</issuerCik>
        <issuerName>Galecto, Inc.</issuerName>
        <issuerTradingSymbol>GLTO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001650322</rptOwnerCik>
            <rptOwnerName>Dallas Jayson Donald Alexander</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GALECTO, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>OLE MAALOES VEJ 3</rptOwnerStreet2>
            <rptOwnerCity>COPENHAGEN N</rptOwnerCity>
            <rptOwnerState>G7</rptOwnerState>
            <rptOwnerZipCode>DK-2200</rptOwnerZipCode>
            <rptOwnerStateDescription>DENMARK</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>16.60</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2020-11-19</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>18000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2030-11-18</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>18000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>16.60</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2020-11-19</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>9000</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2030-11-18</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The shares subject to such option vest in 36 equal monthly installments over three years from the date of vesting commencement of November 19, 2020, subject to the Reporting Person's continuous service to the Issuer on each such date.</footnote>
        <footnote id="F2">Represents a pro-rated annual option grant to a non-employee director upon appointment to the Board of Directors of the Company. The shares subject to such option vest in twelve equal monthly installments, commencing on November 19, 2020, subject to the Reporting Person's continuous service to the Issuer on each such date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jonathan Freve, attorney-in-fact</signatureName>
        <signatureDate>2020-11-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
