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Baird William D III – ‘4’ for 8/5/22 re: 2seventy bio, Inc.

On:  Monday, 8/8/22, at 5:08pm ET   ·   For:  8/5/22   ·   As:  Officer   ·   Accession #:  1562180-22-5951   ·   File #:  1-40791

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  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 8/08/22  Baird William D III               4          Officer     1:5K   2seventy bio, Inc.                Solium Capital Inc.

Statement of Changes in Beneficial Ownership of Securities by an Insider   —   Form 4   —   SEA’34

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 4           Statement of Changes in Beneficial Ownership of     HTML      6K 
                Securities by an Insider --                                      
                primarydocument.xml/3.6


        

This ‘4’ Document is an XML Data File that may be rendered in various formats:

  Form 4    –   Plain Text   –  SEC Website  –  EDGAR System  –    XML Data    –  <?xml?> File
 
 
XML Data rendering:  Statement of Changes in Beneficial Ownership of Securities by an Insider
 
                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<ownershipDocument>
<schemaVersion> X0306 </schemaVersion>
<documentType> 4 </documentType>
<periodOfReport> 2022-08-05 </periodOfReport>
<notSubjectToSection16> false </notSubjectToSection16>
<issuer>
<issuerCik> 0001860782 </issuerCik>
<issuerName> 2seventy bio, Inc. </issuerName>
<issuerTradingSymbol> TSVT </issuerTradingSymbol>
</issuer>
<reportingOwner>
<reportingOwnerId>
<rptOwnerCik> 0001547658 </rptOwnerCik>
<rptOwnerName> Baird William D III </rptOwnerName>
</reportingOwnerId>
<reportingOwnerAddress>
<rptOwnerStreet1> 60 BINNEY STREET </rptOwnerStreet1>
<rptOwnerStreet2></rptOwnerStreet2>
<rptOwnerCity> CAMBRIDGE </rptOwnerCity>
<rptOwnerState> MA </rptOwnerState>
<rptOwnerZipCode> 02142 </rptOwnerZipCode>
<rptOwnerStateDescription></rptOwnerStateDescription>
</reportingOwnerAddress>
<reportingOwnerRelationship>
<isDirector> false </isDirector>
<isOfficer> true </isOfficer>
<isTenPercentOwner> false </isTenPercentOwner>
<isOther> false </isOther>
<officerTitle> Chief Financial Officer </officerTitle>
<otherText></otherText>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable>
<nonDerivativeTransaction>
<securityTitle>
<value> Common Stock </value>
</securityTitle>
<transactionDate>
<value> 2022-08-05 </value>
</transactionDate>
<deemedExecutionDate></deemedExecutionDate>
<transactionCoding>
<transactionFormType> 4 </transactionFormType>
<transactionCode> S </transactionCode>
<equitySwapInvolved> false </equitySwapInvolved>
<footnoteId id="F1"/>
</transactionCoding>
<transactionTimeliness></transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value> 4152.00 </value>
</transactionShares>
<transactionPricePerShare>
<value> 16.2325 </value>
<footnoteId id="F2"/>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value> D </value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value> 83096.00 </value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value> D </value>
</directOrIndirectOwnership>
</ownershipNature>
</nonDerivativeTransaction>
</nonDerivativeTable>
<derivativeTable></derivativeTable>
<footnotes>
<footnote id="F1"> Shares were sold to cover tax withholding obligations incurred in connection with the vesting of Restricted Stock Units. </footnote>
<footnote id="F2"> The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.39 to $16.71, inclusive. The reporting person will provide, upon request by the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price. </footnote>
</footnotes>
<remarks></remarks>
<ownerSignature>
<signatureName> /s/ Teresa Jurgensen, Attorney-in-Fact </signatureName>
<signatureDate> 2022-08-08 </signatureDate>
</ownerSignature>
</ownershipDocument>


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Filing Submission 0001562180-22-005951   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
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