BLUE bluebird bio Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14D-9

SOLICITATION/RECOMMENDATION STATEMENT

PURSUANT TO SECTION 14(d)(4) OF THE SECURITIES EXCHANGE ACT OF 1934

bluebird bio, Inc.

(Name of Subject Company)

bluebird bio, Inc.

(Name of Person(s) Filing Statement)

Common Stock, $0.01 par value per share

(Title of Class of Securities)

09609G 209

(CUSIP Number of Common Stock)

Andrew Obenshain

President and Chief Executive Officer

bluebird bio, Inc.

455 Grand Union Boulevard

Somerville, Massachusetts 02145

(339) 499-9300

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications

on Behalf of the Person(s) Filing Statement)

With a copy to:

R. Scott Shean

Andrew Clark

Brian R. Umanoff

Latham & Watkins LLP

650 Town Center Drive, 20^th Floor

Boston, Massachusetts 92626

(714) 540-1235

The information set forth under Items 1.01, 8.01 and 9.01 of the Current Report on Form 8-K filed by bluebird bio, Inc. on February 21, 2025 (including all exhibits attached thereto) is incorporated herein by reference.