UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 __________________________ FORM 8-K __________________________ CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 __________________________ bluebird bio, Inc. (Exact name of Registrant as Specified in Its Charter) _____________________________________________________________ Delaware 001-35966 13-3680878 (State or Other Jurisdiction (IRS Em ...