    <SEC-DOCUMENT>0001125345-15-000018-index.html : 20150605
    <SEC-HEADER>0001125345-15-000018.hdr.sgml : 20150605
    <ACCEPTANCE-DATETIME>20150605142512
    ACCESSION NUMBER:		0001125345-15-000018
    CONFORMED SUBMISSION TYPE:	10-K/A
    PUBLIC DOCUMENT COUNT:		10
    CONFORMED PERIOD OF REPORT:	20141231
    FILED AS OF DATE:		20150605
    DATE AS OF CHANGE:		20150605

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MACROGENICS INC
    		CENTRAL INDEX KEY:			0001125345
    		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		10-K/A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-36112
    		FILM NUMBER:		15915502

    	BUSINESS ADDRESS:
    		STREET 1:		9640 MEDICAL CENTER DRIVE
    		CITY:			Rockville
    		STATE:			MD
    		ZIP:			20850
    		BUSINESS PHONE:		301-251-5172

    	MAIL ADDRESS:
    		STREET 1:		9640 MEDICAL CENTER DRIVE
    		CITY:			ROCKVILLE
    		STATE:			MD
    		ZIP:			20850
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>10-K/A
    <SEQUENCE>1
    <FILENAME>form10-k_a.htm
    <TEXT>
    Document 1 - file: form10-k_a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-31.1
    <SEQUENCE>2
    <FILENAME>exhibit31_1.htm
    <TEXT>
    Document 2 - file: exhibit31_1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-31.2
    <SEQUENCE>3
    <FILENAME>exhibit31_2.htm
    <TEXT>
    Document 3 - file: exhibit31_2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.3
    <SEQUENCE>4
    <FILENAME>exhibit4_3.htm
    <TEXT>
    Document 4 - file: exhibit4_3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.25
    <SEQUENCE>5
    <FILENAME>exhibit10-25.htm
    <TEXT>
    Document 5 - file: exhibit10-25.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>image0.jpg
    <TEXT>
    Document 6 - file: image0.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>image1.jpg
    <TEXT>
    Document 7 - file: image1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>image2.jpg
    <TEXT>
    Document 8 - file: image2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>image3.jpg
    <TEXT>
    Document 9 - file: image3.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>image4.jpg
    <TEXT>
    Document 10 - file: image4.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>