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            <issuerCik>0001653087</issuerCik>
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            <secFileNumber>001-38792</secFileNumber>
            <issuerAddress>
                <ns2:street1>131 Oyster Point Blvd.</ns2:street1>
                <ns2:city>South San Francisco</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>94080</ns2:zipCode>
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            <issuerContactPhone>415-231-5660</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>POLARIS VENTURE PAR. VI (AIV-B), LP</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
                <relationshipToIssuer>10% Stockholder</relationshipToIssuer>
            </relationshipsToIssuer>
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        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>38th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>93214</noOfUnitsSold>
            <aggregateMarketValue>559284.00</aggregateMarketValue>
            <noOfUnitsOutstanding>83830300</noOfUnitsOutstanding>
            <approxSaleDate>09/11/2023</approxSaleDate>
            <securitiesExchangeName>NASD</securitiesExchangeName>
        </securitiesInformation>
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            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>10/11/2013</acquiredDate>
            <natureOfAcquisitionTransaction>Private Acquisition from Issuer/Affiliate</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Alector, Inc</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>93214</amountOfSecuritiesAcquired>
            <paymentDate>10/11/2013</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>09/11/2023</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Harold Scot Friedman</signature>
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144
0001767130
XXXXXXXX
LIVE
0001653087
ALECTOR, INC.
001-38792
131 Oyster Point Blvd.
South San Francisco
CA
94080
415-231-5660
POLARIS VENTURE PAR. VI (AIV-B), LP
Director
10% Stockholder
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Floor
New York
NY
10004
93214
559284.00
83830300
09/11/2023
NASD
Common
10/11/2013
Private Acquisition from Issuer/Affiliate
Alector, Inc
N
93214
10/11/2013
Cash
Y
09/11/2023
/s/ Harold Scot Friedman