FORM 4
[ ] 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 *

McMahon Gerald PhD
2. Issuer Name and Ticker or Trading Symbol

Celldex Therapeutics, Inc. [ CLDX ]
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 CELLDEX THERAPEUTICS, INC., 53 FRONTAGE ROAD, SUITE 220
3. Date of Earliest Transaction (MM/DD/YYYY)

7/2/2018
(Street)

HAMPTON, NJ 08827
(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, par value $0.001 per share   7/2/2018     F    2813   D $.5036   194923   (1) (2) 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

Explanation of Responses:
(1)  On November 28, 2016, in connection with the Reporting Person's employment separation agreement with Kolltan Pharmaceuticals, Inc., Reporting Person entered into a severance agreement (the "Severance Agreement") with Celldex Therapeutics, Inc. ("Issuer") whereby Issuer agreed to pay Reporting Person 267,356 shares of its common stock, par value $0.001 per share ("Common Stock") less required tax and other withholdings (the "Withholdings".) The Reporting Person previously reported ownership of such 267,356 shares on his Form 3 filed with the Securities and Exchange Commission on December 15, 2016. The shares, less Withholdings, are issuable to Reporting Person in equal installments through December 2018.
(2)  Pursuant to the Severance Agreement, on July 2, 2018, the Issuer issued 5,541 shares of its Common Stock to the Reporting Person. This Form 4 reflects the disposition to the Issuer of 2,813 shares of its Common Stock to satisfy required Withholdings in connection with such issuance of Common Stock to the Reporting Person.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
McMahon Gerald PhD
C/O CELLDEX THERAPEUTICS, INC.
53 FRONTAGE ROAD, SUITE 220
HAMPTON, NJ 08827
X



Signatures
/s/ Samuel B. Martin, attorney-in-fact for Gerald McMahon 7/3/2018
** 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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