    <SEC-DOCUMENT>0001104659-21-055589-index.html : 20210427
    <SEC-HEADER>0001104659-21-055589.hdr.sgml : 20210427
    <ACCEPTANCE-DATETIME>20210427160606
    ACCESSION NUMBER:		0001104659-21-055589
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		3
    CONFORMED PERIOD OF REPORT:	20210617
    FILED AS OF DATE:		20210427
    DATE AS OF CHANGE:		20210427

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Celldex Therapeutics, Inc.
    		CENTRAL INDEX KEY:			0000744218
    		STANDARD INDUSTRIAL CLASSIFICATION:	IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES [2835]
    		IRS NUMBER:				133191702
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-15006
    		FILM NUMBER:		21858925

    	BUSINESS ADDRESS:
    		STREET 1:		53 FRONTAGE ROAD
    		STREET 2:		SUITE 220
    		CITY:			HAMPTON
    		STATE:			NJ
    		ZIP:			08827
    		BUSINESS PHONE:		908-200-7500

    	MAIL ADDRESS:
    		STREET 1:		53 FRONTAGE ROAD
    		STREET 2:		SUITE 220
    		CITY:			HAMPTON
    		STATE:			NJ
    		ZIP:			08827

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	AVANT IMMUNOTHERAPEUTICS INC
    		DATE OF NAME CHANGE:	19980828

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	T CELL SCIENCES INC
    		DATE OF NAME CHANGE:	19920703
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>tm212386-1_def14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: tm212386-1_def14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>tm212386d1-proxy_cellpg1bw.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: tm212386d1-proxy_cellpg1bw.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tm212386d1-proxy_cellpg2bw.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm212386d1-proxy_cellpg2bw.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>