<SEC-DOCUMENT>0000899243-23-018840.txt : 20230913
<SEC-HEADER>0000899243-23-018840.hdr.sgml : 20230913
<ACCEPTANCE-DATETIME>20230913163340
ACCESSION NUMBER:		0000899243-23-018840
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20230911
FILED AS OF DATE:		20230913
DATE AS OF CHANGE:		20230913

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Polaris Venture Partners VI, L.P.
		CENTRAL INDEX KEY:			0001493463
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38792
		FILM NUMBER:		231253097

	BUSINESS ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE, 8TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		781-290-0770

	MAIL ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE, 8TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Polaris Venture Partners Founders' Fund VI, L.P.
		CENTRAL INDEX KEY:			0001575691
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38792
		FILM NUMBER:		231253098

	BUSINESS ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE, 8TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		885-787-3500

	MAIL ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE, 8TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Polaris Venture Partners VI (AIV-B), L.P.
		CENTRAL INDEX KEY:			0001767130
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38792
		FILM NUMBER:		231253096

	BUSINESS ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE
		STREET 2:		10TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		8557873500

	MAIL ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE
		STREET 2:		10TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210

	FORMER NAME:	
		FORMER CONFORMED NAME:	PVP VI (AIV) Feeder Corp. Holding Partnership, L.P.
		DATE OF NAME CHANGE:	20190206

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Polaris Venture Management Co. VI, L.L.C.
		CENTRAL INDEX KEY:			0001665594
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38792
		FILM NUMBER:		231253100

	BUSINESS ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE
		STREET 2:		8TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		(855) 787-3500

	MAIL ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE
		STREET 2:		8TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Polaris Venture Partners VI (AIV), L.P.
		CENTRAL INDEX KEY:			0001767127
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38792
		FILM NUMBER:		231253099

	BUSINESS ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE
		STREET 2:		8TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210
		BUSINESS PHONE:		8557873500

	MAIL ADDRESS:	
		STREET 1:		ONE MARINA PARK DRIVE
		STREET 2:		8TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02210

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Alector, Inc.
		CENTRAL INDEX KEY:			0001653087
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				822933343
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		131 OYSTER POINT BLVD., SUITE 600
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080
		BUSINESS PHONE:		415-231-5660

	MAIL ADDRESS:	
		STREET 1:		131 OYSTER POINT BLVD., SUITE 600
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Alector LLC
		DATE OF NAME CHANGE:	20150915
</SEC-HEADER>
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<DESCRIPTION>FORM 4 SUBMISSION
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    <documentType>4</documentType>

    <periodOfReport>2023-09-11</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001653087</issuerCik>
        <issuerName>Alector, Inc.</issuerName>
        <issuerTradingSymbol>ALEC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001665594</rptOwnerCik>
            <rptOwnerName>Polaris Venture Management Co. VI, L.L.C.</rptOwnerName>
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            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02210</rptOwnerZipCode>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001767127</rptOwnerCik>
            <rptOwnerName>Polaris Venture Partners VI (AIV), L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE MARINA PARK DRIVE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02210</rptOwnerZipCode>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001575691</rptOwnerCik>
            <rptOwnerName>Polaris Venture Partners Founders' Fund VI, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE MARINA PARK DRIVE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001493463</rptOwnerCik>
            <rptOwnerName>Polaris Venture Partners VI, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE MARINA PARK DRIVE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001767130</rptOwnerCik>
            <rptOwnerName>Polaris Venture Partners VI (AIV-B), L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE MARINA PARK DRIVE, 8TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
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            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
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    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2023-09-11</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>500000</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>6.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10853817</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">27,606 shares were sold by Polaris Venture Partners Founders' Fund VI, L.P. (&quot;PVPFF VI&quot;), 379,180 shares were sold by Polaris Venture Partners VI (AIV), L.P. (&quot;PVP VI AIV&quot;) and 93,214 shares were sold by Polaris Venture Partners VI (AIV-B), L.P. (p/k/a PVP VI (AIV) Feeder Corp. Holding Partnership, L.P., &quot;PVP VI AIV-B&quot; and, together with PVPFF VI, PVP VI AIV and Polaris Venture Partners VI, L.P. (&quot;PVP VI&quot;), the &quot;Polaris Funds&quot;).</footnote>
        <footnote id="F2">(Continued from footnote 1) The general partner of each of the Polaris Funds is Polaris Venture Management Co. VI, L.L.C. (&quot;PVM&quot;). Each of Amir Nashat, Brian Chee, David Barrett, Bryce Youngren, Jonathan Flint, and Terrance McGuire, a member of the Issuer's board of directors, are managing members of PVM (collectively, the &quot;Managing Members&quot;) and may be deemed to have shared power to vote and dispose of the shares held by the Polaris Funds. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein.</footnote>
        <footnote id="F3">599,251 shares are held by PVPFF VI, 7,831,004 shares are held by PVP VI AIV, 1,925,094 shares are held by PVP VI AIV-B and 498,468 shares are held by PVP VI. Each of the Managing Members and PVM disclaims beneficial ownership of the securities held by the Polaris Funds, and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interest therein.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Lauren Crockett, as attorney in fact for Polaris Venture Management Co. VI, L.L.C.</signatureName>
        <signatureDate>2023-09-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Lauren Crockett, as attorney in fact for Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners VI (AIV), L.P.</signatureName>
        <signatureDate>2023-09-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Lauren Crockett, as attorney in fact for Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners Founders' Fund VI, L.P.</signatureName>
        <signatureDate>2023-09-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Lauren Crockett, as attorney in fact for Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners VI, L.P.</signatureName>
        <signatureDate>2023-09-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Lauren Crockett, as attorney in fact for Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners VI (AIV-B), L.P.</signatureName>
        <signatureDate>2023-09-13</signatureDate>
    </ownerSignature>
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