<SEC-DOCUMENT>0001288123-15-000035.txt : 20150708
<SEC-HEADER>0001288123-15-000035.hdr.sgml : 20150708
<ACCEPTANCE-DATETIME>20150708155928
ACCESSION NUMBER:		0001288123-15-000035
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20150706
FILED AS OF DATE:		20150708
DATE AS OF CHANGE:		20150708

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AGENUS INC
		CENTRAL INDEX KEY:			0001098972
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				061562417
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3 FORBES ROAD
		CITY:			LEXINGTON
		STATE:			MA
		ZIP:			02421
		BUSINESS PHONE:		781-674-4410

	MAIL ADDRESS:	
		STREET 1:		3 FORBES ROAD
		CITY:			LEXINGTON
		STATE:			MA
		ZIP:			02421

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ANTIGENICS INC /DE/
		DATE OF NAME CHANGE:	19991115

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Valentine Karen
		CENTRAL INDEX KEY:			0001437152

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-29089
		FILM NUMBER:		15979131

	MAIL ADDRESS:	
		STREET 1:		C/O ANTIGENICS INC.
		STREET 2:		3 FORBES RD
		CITY:			LEXINGTON
		STATE:			MA
		ZIP:			02421
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_143638555892231.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-07-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001098972</issuerCik>
        <issuerName>AGENUS INC</issuerName>
        <issuerTradingSymbol>AGEN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001437152</rptOwnerCik>
            <rptOwnerName>Valentine Karen</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ANTIGENICS INC.</rptOwnerStreet1>
            <rptOwnerStreet2>3 FORBES RD</rptOwnerStreet2>
            <rptOwnerCity>LEXINGTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02421</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP, General Counsel</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option, right to buy</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.04</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2015-07-06</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>12000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>5.04</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2015-07-06</value>
            </exerciseDate>
            <expirationDate>
                <value>2025-02-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Commmon Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>12000.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents the achievement of certain performance criteria and the vesting of 50% of a performance-based award originally granted on February 12, 2015 and disclosed in a Form 4 filed February 17, 2015.  The remaining 12,000 shares vest in one installment upon the registrant's achievement of certain additional performance criteria within 30 months from the date of grant.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Christine M. Klaskin, by Power of Attorney</signatureName>
        <signatureDate>2015-07-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>agenussection16poa-kv.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
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<pre>
POWER OF ATTORNEY
For Executing Forms 3, 4 and 5

    Know all by these presents, that the undersigned hereby constitutes and appoints each of Garo H. Armen, Christine Klaskin, Karen Valentine, and Evan Kearns, signing singly, his/her true and lawful attorney-in-fact to:
    (1)    execute for and on behalf of the undersigned Forms 3, 4 and 5 in accordance with Section16(a) of the Securities Exchange Act of 1934 and the rules thereunder, and any other forms or reports the undersigned may be required to file, in connection with the undersigned's ownership, acquisition, or disposition of securities of Agenus Inc., a Delaware corporation;
    (2)    do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete the execution of any such Form3, 4 and 5, or other form or report, complete and execute any amendment or amendments thereto, and the timely filing of such form with the United States Securities and Exchange Commission and any other authority; and
    (3)    take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in his/her discretion.
    The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform all and every act and thing whatsoever requisite, necessary and proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as such attorney-in-fact might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or his/her substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming any of the undersigned's responsibilities to comply with Section16 of the Securities Exchange Act of 1934.
      This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.
    IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this __24___ day of __June_____ 2015.


/s/ Karen H. Valentine                        Print Name:    Karen H. Valentine
               Signature



</pre>
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