<SEC-DOCUMENT>0001209191-21-049821.txt : 20210804
<SEC-HEADER>0001209191-21-049821.hdr.sgml : 20210804
<ACCEPTANCE-DATETIME>20210804211758
ACCESSION NUMBER:		0001209191-21-049821
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210802
FILED AS OF DATE:		20210804
DATE AS OF CHANGE:		20210804

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ROCKLAGE SCOTT M
		CENTRAL INDEX KEY:			0001219014

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40693
		FILM NUMBER:		211145957

	MAIL ADDRESS:	
		STREET 1:		179 SANDY POND ROAD
		CITY:			LINCOLN
		STATE:			MA
		ZIP:			01773

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Schwab Andrew J.
		CENTRAL INDEX KEY:			0001598549

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40693
		FILM NUMBER:		211145961

	MAIL ADDRESS:	
		STREET 1:		C/O 5AM VENTURES, 2200 SAND HILL ROAD
		STREET 2:		SUITE 110
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			5AM Ventures V, L.P.
		CENTRAL INDEX KEY:			0001674324
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40693
		FILM NUMBER:		211145958

	BUSINESS ADDRESS:	
		STREET 1:		2200 SAND HILL ROAD, SUITE 110
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
		BUSINESS PHONE:		(650) 233-8600

	MAIL ADDRESS:	
		STREET 1:		2200 SAND HILL ROAD, SUITE 110
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			5AM Partners V, LLC
		CENTRAL INDEX KEY:			0001791889
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40693
		FILM NUMBER:		211145959

	BUSINESS ADDRESS:	
		STREET 1:		501 SECOND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107
		BUSINESS PHONE:		650-233-8600

	MAIL ADDRESS:	
		STREET 1:		501 SECOND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			5AM Opportunities I, L.P.
		CENTRAL INDEX KEY:			0001753000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40693
		FILM NUMBER:		211145962

	BUSINESS ADDRESS:	
		STREET 1:		501 SECOND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107
		BUSINESS PHONE:		415-993-8570

	MAIL ADDRESS:	
		STREET 1:		501 SECOND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			5AM Opportunities I (GP), LLC
		CENTRAL INDEX KEY:			0001790778
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40693
		FILM NUMBER:		211145960

	BUSINESS ADDRESS:	
		STREET 1:		501 2ND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107
		BUSINESS PHONE:		(650) 233-86000

	MAIL ADDRESS:	
		STREET 1:		501 2ND STREET, SUITE 350
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Rallybio Corp
		CENTRAL INDEX KEY:			0001739410
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				851083789
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		234 CHURCH STREET
		STREET 2:		SUITE 1020
		CITY:			NEW HAVEN
		STATE:			CT
		ZIP:			06510
		BUSINESS PHONE:		203- 859-3820

	MAIL ADDRESS:	
		STREET 1:		234 CHURCH STREET
		STREET 2:		SUITE 1020
		CITY:			NEW HAVEN
		STATE:			CT
		ZIP:			06510

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Rallybio Holdings, LLC
		DATE OF NAME CHANGE:	20180502
</SEC-HEADER>
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<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
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<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-08-02</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001739410</issuerCik>
        <issuerName>Rallybio Corp</issuerName>
        <issuerTradingSymbol>RLYB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001753000</rptOwnerCik>
            <rptOwnerName>5AM Opportunities I, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>501 2ND STREET, SUITE 350</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001598549</rptOwnerCik>
            <rptOwnerName>Schwab Andrew J.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>501 2ND STREET, SUITE 350</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001790778</rptOwnerCik>
            <rptOwnerName>5AM Opportunities I (GP), LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>501 2ND STREET, SUITE 350</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001791889</rptOwnerCik>
            <rptOwnerName>5AM Partners V, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>501 2ND STREET, SUITE 350</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001674324</rptOwnerCik>
            <rptOwnerName>5AM Ventures V, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>501 2ND STREET, SUITE 350</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001219014</rptOwnerCik>
            <rptOwnerName>ROCKLAGE SCOTT M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>501 2ND STREET, SUITE 350</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-08-02</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>615384</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1406098</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2784626</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Shares are held by 5AM Opportunities I, L.P. (&quot;Opportunities I&quot;). 5AM Opportunities I (GP), LLC is the general partner of Opportunities I and may be deemed to have sole investment and voting power over the shares held  by Opportunities I. Each of Andrew Schwab and Dr. Kush Parmar is a Managing Member of 5AM Opportunities I (GP), LLC, and may be deemed to have shared voting and dispositive power over the shares held by Opportunities I. Therefore, each of Andrew Schwab, Dr. Kush Parmar and 5AM Opportunities I(GP),  LLC may be deemed to beneficially own the shares held by Opportunities I, and each disclaims beneficial ownership over the shares held by Opportunities I except to the extent of his or its pecuniary interest therein. Dr. Parmar is a director of the issuer and files separate Section 16 reports.</footnote>
        <footnote id="F2">Shares are held by 5AM Ventures V, L.P. (&quot;Ventures V&quot;). 5AM Partners V, LLC is the general partner of Ventures V and may be deemed to have sole investment and voting power over the shares held by Ventures V. Each of Andrew Schwab, Dr. Kush Parmar and Dr. Scott Rocklage is a Managing Member of 5AM Partners V, LLC, and may be deemed to have shared voting and dispositive power over the shares held by Ventures V. Therefore, each of Andrew  Schwab, Dr. Kush Parmar, Dr. Scott Rocklage, and 5AM Partners V, LLC may be deemed to beneficially own the shares held by Ventures V, and each disclaims beneficial ownership over the shares held by Ventures V except to the extent of his or its pecuniary interest therein. Dr. Parmar is a director of the issuer and files separate Section 16 reports.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>5AM Opportunities I, L.P., By: 5AMOpportunities I (GP), LLC, its General Partner, By /s/ Andrew J. Schwab, Managing Member</signatureName>
        <signatureDate>2021-08-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Andrew J. Schwab</signatureName>
        <signatureDate>2021-08-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>5AM Opportunities I (GP), LLC, By /s/Andrew J. Schwab, Managing Member</signatureName>
        <signatureDate>2021-08-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>5AM Partners V, LLC, By /s/ Scott M.Rocklage, Managing Member</signatureName>
        <signatureDate>2021-08-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>5AM Ventures V, L.P., By: 5AM Partners V,LLC, its General Partner, By /s/ Scott M.Rocklage, Managing Member</signatureName>
        <signatureDate>2021-08-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Scott M. Rocklage</signatureName>
        <signatureDate>2021-08-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
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