Insider Trading & Ownership of bluebird bio, Inc.

Location
Somerville, MA
Signature
By: /s/ Helen Fu, SVP, General Counsel of bluebird bio, Inc.
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Ownership of bluebird bio, Inc.

Symbol Company Relationship Holdings Value Past Year Net Change Change % Report Period
TSVT 2seventy bio, Inc. 10%+ Owner 03 Nov 2021

Insider Transactions Reported by bluebird bio, Inc.:

Sym Company Class Transaction % Value $ * Price $ Shares Shares After Date Ownership
* An asterisk sign (*) next to the price indicates that the price is likely invalid.