FORM 4
[ X ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Klausner Richard 		2. Issuer Name and Ticker or Trading Symbol

Juno Therapeutics, Inc. [ JUNO ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

C/O 400 DEXTER AVENUE NORTH, SUITE 1200 		3. Date of Earliest Transaction (MM/DD/YYYY)

3/5/2018
(Street)

SEATTLE, WA 98109
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   2/7/2018     G   V 23250   D $0.00   (1) 705525   D    
Common Stock   3/5/2018   (2) (3)   U    705525   D $87.00   0   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 of Derivative Security: 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
Director Stock Option (Right to Buy)   $60.00   3/5/2018   (2)   D         12000      (4) 6/11/2025   Common Stock   12000   $27.00   (4) 0   D    
Director Stock Option (Right to Buy)   $42.40   3/5/2018   (2)   D         12000      (4) 6/16/2026   Common Stock   12000   $44.60   (4) 0   D    
Director Stock Option (Right to Buy)   $23.29   3/5/2018   (2)   D         12000      (4) 6/15/2027   Common Stock   12000   $63.71   (4) 0   D    

Explanation of Responses:
(1)  Represents a bona fide gift of common stock; thus, there is no price associated with this transaction.
(2)  On January 21, 2018, Juno Therapeutics, Inc. (the "Company"), entered into an Agreement and Plan of Merger (the "Merger Agreement") with Celgene Corporation ("Parent"), and Blue Magpie Corporation, a wholly owned subsidiary of Parent ("Purchaser"). On March 5, 2018, Purchaser irrevocably accepted for payment and promptly paid for, all shares of common stock validly tendered and not validly withdrawn pursuant to the Offer (as defined in the Merger Agreement). On March 6, 2018, Purchaser merged with and into the Company pursuant to Section 251(h) of the General Corporation Law of the State of Delaware, with the Company being the surviving corporation (the "Merger") and becoming a wholly-owned subsidiary of Parent.
(3)  Pursuant to the terms of the Merger Agreement and the Offer, each share of common stock of the Company held by the Reporting Person was validly tendered for $87.00 per share in cash, without interest and subject to withholding of taxes.
(4)  In accordance with their terms, Options held by non-employee directors were converted into the right to receive an amount in cash equal to the product of (i) the number of shares of common stock subject to such Option and (ii) $87.00 less the applicable exercise price.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Klausner Richard
C/O 400 DEXTER AVENUE NORTH
SUITE 1200
SEATTLE, WA 98109 		X



Signatures
/s/ Zachary D. Hale, attorney-in-fact 3/7/2018
** 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 control number.
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