<SUBMISSION>
<SECRELEASE-DATETIME> 20240328-202953 ⇐ Metadata from SEC Info (ET)
<SECWEBSITE-DATETIME> 20240328-202945 ⇐ Metadata from SEC Info (ET)
<ACCEPTANCE-DATETIME> 20240328-202909 ⇐ Filing accepted by SEC (ET)
<ACCESSION-NUMBER> 0000919574-24-002241
<TYPE> 4
<PUBLIC-DOCUMENT-COUNT> 1
<PERIOD> 20240326
<FILING-DATE> 20240328
<DATE-OF-FILING-DATE-CHANGE> 20240328
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<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME> Casdin Partners GP, LLC
<CIK> 0001534260
<ORGANIZATION-NAME>
<STATE-OF-INCORPORATION> DE
<FISCAL-YEAR-END> 1231
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE> 4
<ACT> 34
<FILE-NUMBER> 001-40791
<FILM-NUMBER> 24801624
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1> 1350 AVENUE OF THE AMERICAS
<STREET2> SUITE 1140
<CITY> NEW YORK
<STATE> NY
<ZIP> 10019
<PHONE> 212.300.5575
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1> 1350 AVENUE OF THE AMERICAS
<STREET2> SUITE 1140
<CITY> NEW YORK
<STATE> NY
<ZIP> 10019
</MAIL-ADDRESS>
</REPORTING-OWNER>
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<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME> Casdin Capital, LLC
<CIK> 0001534261
<ORGANIZATION-NAME>
<STATE-OF-INCORPORATION> DE
<FISCAL-YEAR-END> 1231
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE> 4
<ACT> 34
<FILE-NUMBER> 001-40791
<FILM-NUMBER> 24801626
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1> 1350 AVENUE OF THE AMERICAS
<STREET2> SUITE 2600
<CITY> NEW YORK
<STATE> NY
<ZIP> 10019
<PHONE> 212.300.5575
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1> 1350 AVENUE OF THE AMERICAS
<STREET2> SUITE 2600
<CITY> NEW YORK
<STATE> NY
<ZIP> 10019
</MAIL-ADDRESS>
</REPORTING-OWNER>
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<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME> Casdin Eli
<CIK> 0001534264
<ORGANIZATION-NAME>
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE> 4
<ACT> 34
<FILE-NUMBER> 001-40791
<FILM-NUMBER> 24801623
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1> 1350 AVENUE OF THE AMERICAS
<STREET2> SUITE 1140
<CITY> NEW YORK
<STATE> NY
<ZIP> 10019
</MAIL-ADDRESS>
</REPORTING-OWNER>
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<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME> Casdin Partners Master Fund, L.P.
<CIK> 0001534265
<ORGANIZATION-NAME>
<STATE-OF-INCORPORATION> E9 ⇐ This is an SEC Country/Territory Code for
Cayman Islands [ U.K. ] {KY|CYM}
<FISCAL-YEAR-END> 1231
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE> 4
<ACT> 34
<FILE-NUMBER> 001-40791
<FILM-NUMBER> 24801625
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1> WALKER HOUSE
<STREET2> 87 MARY STREET
<CITY> GEORGE TOWN
<STATE> E9 ⇐ This is an SEC Country/Territory Code for
Cayman Islands [ U.K. ] {KY|CYM}
<ZIP> KY1-9001
<PHONE> 212.300.5575
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1> WALKER HOUSE
<STREET2> 87 MARY STREET
<CITY> GEORGE TOWN
<STATE> E9 ⇐ This is an SEC Country/Territory Code for
Cayman Islands [ U.K. ] {KY|CYM}
<ZIP> KY1-9001
</MAIL-ADDRESS>
</REPORTING-OWNER>
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<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME> 2seventy bio, Inc.
<CIK> 0001860782
<ASSIGNED-SIC> 2834
<ORGANIZATION-NAME> 03 Life Sciences
<IRS-NUMBER> 863658454 ⇒ 86-3658454
<STATE-OF-INCORPORATION> DE
<FISCAL-YEAR-END> 1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1> 60 BINNEY STREET
<CITY> CAMBRIDGE
<STATE> MA
<ZIP> 02210
<PHONE> 339-499-9300
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1> 60 BINNEY STREET
<CITY> CAMBRIDGE
<STATE> MA
<ZIP> 02210
</MAIL-ADDRESS>
</ISSUER>
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<DOCUMENT>
<TYPE> 4
<SEQUENCE> 1
<FILENAME> ownership.xml
<TEXT>
<XML>
<?xml version="1.0"?>
Show <XML>: 203 lines (widest: 691 characters) - 10K bytes
</TEXT>
</DOCUMENT>
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</SUBMISSION> |
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