<SEC-DOCUMENT>0001961863-25-000080.txt : 20250624
<SEC-HEADER>0001961863-25-000080.hdr.sgml : 20250624
<ACCEPTANCE-DATETIME>20250624170313
ACCESSION NUMBER:		0001961863-25-000080
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250624
DATE AS OF CHANGE:		20250624

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Jade Biosciences, Inc.
		CENTRAL INDEX KEY:			0001798749
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				831377888
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-40544
		FILM NUMBER:		251070011

	BUSINESS ADDRESS:	
		STREET 1:		221 CRESCENT ST.
		STREET 2:		BUILDING 23, SUITE 105
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02453
		BUSINESS PHONE:		(781) 312-3013

	MAIL ADDRESS:	
		STREET 1:		221 CRESCENT ST.
		STREET 2:		BUILDING 23, SUITE 105
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02453

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Aerovate Therapeutics, Inc.
		DATE OF NAME CHANGE:	20200103

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Atlas Venture Fund XII, L.P.
		CENTRAL INDEX KEY:			0001812049
		ORGANIZATION NAME:           	
		EIN:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144

	BUSINESS ADDRESS:	
		STREET 1:		400 TECHNOLOGY SQUARE
		STREET 2:		10TH FLOOR
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139
		BUSINESS PHONE:		857-201-2700

	MAIL ADDRESS:	
		STREET 1:		400 TECHNOLOGY SQUARE
		STREET 2:		10TH FLOOR
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
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      <issuerCik>0001798749</issuerCik>
      <issuerName>Jade Biosciences, Inc.</issuerName>
      <secFileNumber>001-40544</secFileNumber>
      <issuerAddress>
        <com:street1>221 CRESCENT ST.</com:street1>
        <com:street2>BUILDING 23, SUITE 105</com:street2>
        <com:city>WALTHAM</com:city>
        <com:stateOrCountry>MA</com:stateOrCountry>
        <com:zipCode>02453</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>(781) 312-3013</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Atlas Venture Fund XII, L.P.</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Shareholder</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Jade Biosciences, Inc.</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Merrill Lynch</name>
        <address>
          <com:street1>One Bryant Park</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10036</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>16132</noOfUnitsSold>
      <aggregateMarketValue>159222.84</aggregateMarketValue>
      <noOfUnitsOutstanding>28985019</noOfUnitsOutstanding>
      <approxSaleDate>06/24/2025</approxSaleDate>
      <securitiesExchangeName>Nasdaq</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/04/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Private Placement</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>16132</amountOfSecuritiesAcquired>
      <paymentDate>06/04/2021</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Atlas Ventures Associates XII LP</name>
        <address>
          <com:street1>300 Technology Sq Ste 8</com:street1>
          <com:city>Cambridge</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02139</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>05/06/2025</saleDate>
      <amountOfSecuritiesSold>48</amountOfSecuritiesSold>
      <grossProceeds>498.84</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Atlas Ventures Fund XII LP</name>
        <address>
          <com:street1>300 Technology Sq Ste 8</com:street1>
          <com:city>Cambridge</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02139</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>05/06/2025</saleDate>
      <amountOfSecuritiesSold>5883</amountOfSecuritiesSold>
      <grossProceeds>64061.73</grossProceeds>
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    <securitiesSoldInPast3Months>
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        <name>Atlas Ventures Associates XII LP</name>
        <address>
          <com:street1>300 Technology Sq Ste 8</com:street1>
          <com:city>Cambridge</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02139</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>06/24/2025</saleDate>
      <amountOfSecuritiesSold>131</amountOfSecuritiesSold>
      <grossProceeds>1292.97</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>06/24/2025</noticeDate>
      <signature>Ommer Chohan</signature>
    </noticeSignature>
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