SEC FORM 4 SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
 
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
Krawtschuk Christopher

(Last) (First) (Middle)
C/O BLUEBIRD BIO, INC
455 GRAND UNION BOULEVARD

(Street)
SOMERVILLE MA 02145

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
bluebird bio, Inc. [ BLUE ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Financial Officer
3. Date of Earliest Transaction (Month/Day/Year)
12/06/2023
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Rule 10b5-1(c) Transaction Indication

X
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 12/06/2023 S(1) 4,526 D $4.5155(2) 45,474 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. Shares were sold to cover tax withholding obligations incurred in connection with the vesting of Restricted Stock Units.
2. The range in prices for the transaction reported on this line was $4.50 to $4.55. The average weighted price was $4.5155. 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.
Remarks:
/s/ Sydney Gaylin, Attorney-in-Fact 12/08/2023
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
LIMITED POWER OF ATTORNEY

The undersigned hereby constitutes and appoints each of Joseph
Vittiglio and Sydney Gaylin, and each of them individually, and with
full power of substitution, the undersigned's true and lawful
attorney-in-fact to:

	(1)	Complete and execute for and on behalf of the undersigned,
in the undersigned's capacity as an officer, director and/or ten
percent (10%) shareholder of bluebird bio, Inc., a Delaware
corporation (the "Company") any and all instruments, certificates and
documents required to be executed on behalf of the undersigned as an
individual or on behalf of the undersigned's company or partnership,
as the case may be, pursuant to Section 13 and Section 16 of the
Securities Exchange Act of 1934, as amended (the "Exchange Act") or
the rules and regulations thereunder;

	(2)	Do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and
execute any such instruments, certificates or documents required to
be filed pursuant to Sections 13 and 16 of the Exchange Act or the
rules or regulations thereunder and timely file such forms with the
United States Securities and Exchange Commission and any stock
exchange or similar authority; and

	(3)	Take any other action of any type whatsoever in connection
with the foregoing which, in the opinion of such attorney-in-fact,
may be of benefit to, in the best interest of, or legally required
by, the undersigned, it being understood that the documents executed
by any such attorney-in-fact on behalf of the undersigned pursuant to
this Power of Attorney shall be in such form and shall contain such
terms and conditions as such attorney-in-fact may approve in such
attorney-in-fact's discretion.

	The undersigned hereby grants to each such attorney-in-fact,
acting singly, full power and authority to do and perform any and
every act which is necessary, proper or desirable to be done in the
exercise of any of the rights and powers herein granted, as fully to
all intents and purposes as the undersigned might or could do if
personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that any such attorney-in-fact,
or any such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this Power of Attorney
and the rights and powers herein granted.

      The undersigned acknowledges that each of the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of
the undersigned's responsibilities to comply with Section 13 or
Section 16 of the Exchange Act or the rules or regulations
thereunder.  The undersigned hereby agrees to indemnify each
attorney-in-fact and the Company from and against any demand, damage,
loss, cost or expense arising from any false or misleading
information provided by the undersigned to such attorney-in fact.

	This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file any instruments,
certificates and documents pursuant to Section 13 and 16 of the
Exchange Act or the rules or regulations thereunder with respect to
the undersigned's holdings of and transactions in securities issued
by the Company, unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of December 1, 2023.

  /s/ Christopher Krawtschuk
Christopher Krawtschuk