<SEC-DOCUMENT>0001209191-13-048778.txt : 20131018
<SEC-HEADER>0001209191-13-048778.hdr.sgml : 20131018
<ACCEPTANCE-DATETIME>20131018202428
ACCESSION NUMBER:		0001209191-13-048778
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20131016
FILED AS OF DATE:		20131018
DATE AS OF CHANGE:		20131018

ISSUER:		

	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

	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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			INTERWEST PARTNERS VIII LP
		CENTRAL INDEX KEY:			0001123907
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36112
		FILM NUMBER:		131160361

	BUSINESS ADDRESS:	
		STREET 1:		2710 SAND HILL ROAD
		STREET 2:		2ND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
		BUSINESS PHONE:		650-854-8585

	MAIL ADDRESS:	
		STREET 1:		2710 SAND HILL ROAD
		STREET 2:		2ND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HEDRICK W SCOTT
		CENTRAL INDEX KEY:			0001207834

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36112
		FILM NUMBER:		131160363

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Kliman Gilbert H
		CENTRAL INDEX KEY:			0001293171

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36112
		FILM NUMBER:		131160364

	MAIL ADDRESS:	
		STREET 1:		C/O INTERWEST PARTNERS
		STREET 2:		2710 SAND HILL ROAD, 2ND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GIANOS PHILIP T
		CENTRAL INDEX KEY:			0001207831

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36112
		FILM NUMBER:		131160365

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CASH HARVEY B
		CENTRAL INDEX KEY:			0001198704

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36112
		FILM NUMBER:		131160366

	MAIL ADDRESS:	
		STREET 1:		13455 NOEL ROAD
		STREET 2:		SUITE 1670
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75240

	FORMER NAME:	
		FORMER CONFORMED NAME:	CASH H BERRY
		DATE OF NAME CHANGE:	20021015

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			INTERWEST INVESTORS VIII L P
		CENTRAL INDEX KEY:			0001132601

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36112
		FILM NUMBER:		131160368

	BUSINESS ADDRESS:	
		STREET 1:		2710 SAND HILL ROAD
		STREET 2:		2ND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
		BUSINESS PHONE:		650-854-85

	MAIL ADDRESS:	
		STREET 1:		2710 SAND HILL ROAD
		STREET 2:		2ND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			INTERWEST INVESTORS Q VIII LP
		CENTRAL INDEX KEY:			0001132649

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36112
		FILM NUMBER:		131160367

	BUSINESS ADDRESS:	
		STREET 1:		2710 SAND HILL ROAD
		STREET 2:		2ND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
		BUSINESS PHONE:		650-854-8585

	MAIL ADDRESS:	
		STREET 1:		2710 SAND HILL ROAD
		STREET 2:		2ND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Holmes W Stephen
		CENTRAL INDEX KEY:			0001293923

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36112
		FILM NUMBER:		131160362

	MAIL ADDRESS:	
		STREET 1:		C/O INTERWEST PARTNERS
		STREET 2:		2710 SAND HILL ROAD, 2ND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			InterWest Management Partners VIII, LLC
		CENTRAL INDEX KEY:			0001293949
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36112
		FILM NUMBER:		131160369

	BUSINESS ADDRESS:	
		STREET 1:		2710 SAND HILL ROAD
		STREET 2:		SECOND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
		BUSINESS PHONE:		650-854-8585

	MAIL ADDRESS:	
		STREET 1:		2710 SAND HILL ROAD
		STREET 2:		SECOND FLOOR
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025
</SEC-HEADER>
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            <rptOwnerStreet2>SUITE 200</rptOwnerStreet2>
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            <rptOwnerZipCode>94025</rptOwnerZipCode>
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            <rptOwnerStreet2>SUITE 200</rptOwnerStreet2>
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            <rptOwnerStreet2>SUITE 200</rptOwnerStreet2>
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            <rptOwnerZipCode>94025</rptOwnerZipCode>
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            <rptOwnerStreet2>SUITE 200</rptOwnerStreet2>
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            <isOther>0</isOther>
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    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                    <value>I</value>
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                    <value>See Footnote</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            <transactionCoding>
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                    <value>See Footnote</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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                    <value>See Footnote</value>
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                <value>Common Stock</value>
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                    <value>See Footnote</value>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
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                <footnoteId id="F3"/>
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            <transactionDate>
                <value>2013-10-16</value>
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                <transactionPricePerShare>
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                <footnoteId id="F3"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>615284</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
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                    <footnoteId id="F4"/>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series C Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2013-10-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>5547611</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>295494</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series D-2 Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2013-10-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>613402</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>32671</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series D-2 Convertible Preferred Stock Warrant to buy</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>12.2425</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2013-10-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>46005</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F8"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <value>2013-10-16</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Series D-2 Convertible Preferred Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2448</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series D-2 Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F5"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2013-10-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2448</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F8"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2448</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each share of Series A-1 Convertible Preferred Stock converted into approximately 0.0802 of a share of Common Stock without payment of further consideraton upon the closing of the Issuer's initial public offering. The shares had no expiration date.</footnote>
        <footnote id="F2">These securities are held as follows: 928,647 by InterWest Partners VIII, LP (&quot;IW8&quot;), 7,521 by InterWest Investors VIII, LP (&quot;II8&quot;) and 26,651 by InterWest Investors Q VIII, LP (&quot;IIQ8&quot;) (collectively, the &quot;InterWest Funds&quot;). InterWest Management Partners VIII, LLC (&quot;IMP8&quot;) is the General Partner of IW8, II8 and IIQ8 and has sole voting and investment control over the shares owned by IW8, II8 and IIQ8. Harvey B. Cash, Philip T. Gianos, W. Scott Hedrick, W. Stephen Holmes, Gilbert H. Kliman and Arnold L. Oronsky are Managing Directors of IMP8 and disclaim beneficial ownership of those securities, except to the extent of their pecuniary interest therein.</footnote>
        <footnote id="F3">Each share of Series B Convertible Preferred Stock converted into approximately 0.0607 of a share of Common Stock without payment of further consideraton upon closing of the Issuer's initial public offering. The shares had no expiration date.</footnote>
        <footnote id="F4">These securities are held as follows: 593,566 by IW8, 4,737 by II8 and 16,981 by IIQ8. IMP8 is the General Partner of IW8, II8 and IIQ8 and has sole voting and investment control over the shares owned by IW8, II8 and IIQ8. Harvey B. Cash, Philip T. Gianos, W. Scott Hedrick, W. Stephen Holmes, Gilbert H. Kliman and Arnold L. Oronsky are Managing Directors of IMP8 and disclaim beneficial ownership of those securities, except to the extent of their pecuniary interest therein.</footnote>
        <footnote id="F5">Each share of Series C Convertible Preferred Stock and each share of Series D-2 Convertible Preferred Stock converted into approximately 0.0533 of a share of Common Stock without payment of further consideraton upon closing of the Issuer's initial public offering. The shares had no expiration date.</footnote>
        <footnote id="F6">These securities are held as follows: 285,064 by IW8, 2,275 by II8 and 8,155 by IIQ8. IMP8 is the General Partner of IW8, II8 and IIQ8 and has sole voting and investment control over the shares owned by IW8, II8 and IIQ8. Harvey B. Cash, Philip T. Gianos, W. Scott Hedrick, W. Stephen Holmes, Gilbert H. Kliman and Arnold L. Oronsky are Managing Directors of IMP8 and disclaim beneficial ownership of those securities, except to the extent of their pecuniary interest therein.</footnote>
        <footnote id="F7">These securities are held as follows: 31,519 by IW8, 251 by II8 and 901 by IIQ8. IMP8 is the General Partner of IW8, II8 and IIQ8 and has sole voting and investment control over the shares owned by IW8, II8 and IIQ8. Harvey B. Cash, Philip T. Gianos, W. Scott Hedrick, W. Stephen Holmes, Gilbert H. Kliman and Arnold L. Oronsky are Managing Directors of IMP8 and disclaim beneficial ownership of those securities, except to the extent of their pecuniary interest therein.</footnote>
        <footnote id="F8">Upon exercise, each Series D-2 Convertible Preferred Warrant converted into an equal number of shares of Series D-2 Convertible Preferred Stock. Had the warrants not been exercised, they would have expired upon the closing of the initial public offering. Upon the closing of the Issuer's initial public offering each share of Series D-2 Convertible Preferred Stock then converted into approximately 0.0533 of a share of Common Stock without payment of further consideration. The shares of Series D-2 Convertible Preferred Stock had no expiration date.</footnote>
        <footnote id="F9">These securities are held as follows: 2,363 by IW8, 18 by II8 and 67 by IIQ8. IMP8 is the General Partner of IW8, II8 and IIQ8 and has sole voting and investment control over the shares owned by IW8, II8 and IIQ8. Harvey B. Cash, Philip T. Gianos, W. Scott Hedrick, W. Stephen Holmes, Gilbert H. Kliman and Arnold L. Oronsky are Managing Directors of IMP8 and disclaim beneficial ownership of those securities, except to the extent of their pecuniary interest therein.</footnote>
        <footnote id="F10">Immediately.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ W. Stephen Holmes, Managing Director</signatureName>
        <signatureDate>2013-10-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ W. Stephen Holmes, Managing Director</signatureName>
        <signatureDate>2013-10-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ W. Stephen Holmes, Managing Director</signatureName>
        <signatureDate>2013-10-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ W. Stephen Holmes, Managing Director</signatureName>
        <signatureDate>2013-10-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Harvey B. Cash by Karen A. Wilson Power of Attorney</signatureName>
        <signatureDate>2013-10-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Philip T. Gianos by Karen A. Wilson Power of Attorney</signatureName>
        <signatureDate>2013-10-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Gilbert H. Kliman by Karen A. Wilson Power of Attorney</signatureName>
        <signatureDate>2013-10-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ W. Scott Hedrick by Karen A. Wilson Power of Attorney</signatureName>
        <signatureDate>2013-10-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ W. Stephen Holmes By Karen A. Wilson Power of Attorney</signatureName>
        <signatureDate>2013-10-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>c614356_99x1.htm
<DESCRIPTION>ADDITIONAL EXHIBITS
<TEXT>
  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
     <title>Exhibit 99</title>
</head>
<body>
<PRE>

                                                                           Exhibit 99

                         FORM 3 JOINT FILER INFORMATION

Name of
"Reporting Persons":               InterWest Partners VIII, L.P. ("IW8")
                                   InterWest Investors VIII, L.P. ("II8")
                                   InterWest Investors QVIII, L.P. ("IIQ8")
                                   InterWest Management Partners VIII, LLC ("IMP8")

                                   Harvey B. Cash
                                   Philip T. Gianos
                                   W. Scott Hedrick
                                   W. Stephen Holmes
                                   Gilbert H. Kliman

Address:                           2710 Sand Hill Road, Suite 200
                                   Menlo Park, CA  94025

Designated Filer:                  InterWest Partners VIII, L.P.

Issuer and Ticker Symbol:          MacroGenics, Inc. ("MGNX")

Date of Event:                     October 16, 2013

Each of the following is a Joint Filer with InterWest Partners VIII L.P. ("IW8") and
may be deemed to share indirect beneficial ownership in the securities set forth on
the attached Form 4:

InterWest Management Partners VIII, LLC ("IMP8") is the general partner of IW8, II8,
and IIQ8 and has sole voting and investment control over the shares owned by IW8, II8
and IIQ8. Harvey B. Cash, Philip T. Gianos, W. Scott Hedrick, W. Stephen Holmes,
Gilbert H. Kliman, and Arnold L. Oronsky are Managing Directors of IMP8. Arnold L.
Oronsky, a Managing Director of IMP8 is also a Director of the Issuer, and has filed
a separate Form 4 in his own name.

All Reporting Persons disclaim beneficial ownership of shares of MacroGenics, Inc.
stock held by IW8, II8, and IIQ8, except to the extent of their respective pecuniary
interest therein. The filing of this statement shall not be deemed an admission that,
for purposes of Section 16 of the Securities Exchange Act of 1934, or otherwise, any
of the Reporting Persons are the beneficial owner of all of the equity securities
covered by this statement.

Each of the Reporting Persons listed above has designated InterWest Partners VIII,
L.P. as its designated filer of Forms 3, 4 and 5 in accordance with Section 16(a) of
the Securities Exchange Act of 1934 and the rules thereunder. Each Reporting Person
has appointed InterWest Management Partners VIII, LLC as its attorney in fact for the
purpose of making reports relating to transaction in MacroGenics, Inc. Common Stock.

INTERWEST PARTNERS VIII, L.P.

By: InterWest Management Partners VIII, LLC
    Its General Partner

    /s/ W. Stephen Holmes
By: --------------------------------------
    W. Stephen Holmes, Managing Director

INTERWEST INVESTORS VIII, L.P.

By: InterWest Management Partners VIII, LLC
    Its General Partner

    /s/ W. Stephen Holmes
By: --------------------------------------
    W. Stephen Holmes, Managing Director

INTERWEST INVESTORS Q VIII, L.P.

By: InterWest Management Partners VIII, LLC
    Its General Partner

    /s/ W. Stephen Holmes
By: ---------------------------------------
    W. Stephen Holmes, Managing Director

INTERWEST MANAGEMENT PARTNERS VIII, LLC

    /s/ W. Stephen Holmes
By: ------------------------------------
    W. Stephen Holmes, Managing Director

Harvey B. Cash, an individual                   W. Stephen Holmes, an individual
By: InterWest Management Partners VIII, LLC,    By: InterWest Management Partners VIII, LLC,
    as Attorney-in-Fact                         as Attorney-in-Fact

    /s/ Karen A. Wilson                            /s/ Karen A. Wilson
By: --------------------------------------      By:-----------------------------------------
    Karen A. Wilson, Power of Attorney                Karen A. Wilson, Power of Attorney

Philip T. Gianos, an individual                 Gilbert H. Kliman, an individual
By: InterWest Management Partners VIII, LLC,    By: InterWest Management Partners VIII, LLC,
    as Attorney-in-Fact                             as Attorney-in-Fact

    /s/ Karen A. Wilson                             /s/ Karen A. Wilson
By: ---------------------------------------     By: -----------------------------------------
    Karen A. Wilson, Power of Attorney                Karen A. Wilson, Power of Attorney

W. Scott Hedrick, an individual
By: InterWest Management Partners VIII, LLC,
    as Attorney-in-Fact

    /s/ Karen A. Wilson
By: --------------------------------------
    Karen A. Wilson, Power of Attorney





</PRE>
</body>
</html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
