<SEC-DOCUMENT>0000886163-15-000115.txt : 20151113
<SEC-HEADER>0000886163-15-000115.hdr.sgml : 20151113
<ACCEPTANCE-DATETIME>20151113172811
ACCESSION NUMBER:		0000886163-15-000115
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20151111
FILED AS OF DATE:		20151113
DATE AS OF CHANGE:		20151113

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LIGAND PHARMACEUTICALS INC
		CENTRAL INDEX KEY:			0000886163
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				770160744
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		11119 NORTH TORREY PINES ROAD
		STREET 2:		SUITE 200
		CITY:			LA JOLLA
		STATE:			CA
		ZIP:			92037
		BUSINESS PHONE:		858-550-7500

	MAIL ADDRESS:	
		STREET 1:		11119 NORTH TORREY PINES ROAD
		STREET 2:		SUITE 200
		CITY:			LA JOLLA
		STATE:			CA
		ZIP:			92037

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Herman Melanie J
		CENTRAL INDEX KEY:			0001605325

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33093
		FILM NUMBER:		151230331

	MAIL ADDRESS:	
		STREET 1:		11119 NORTH TORREY PINES ROAD, SUITE 200
		CITY:			LA JOLLA
		STATE:			CA
		ZIP:			92037
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
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        <issuerName>LIGAND PHARMACEUTICALS INC</issuerName>
        <issuerTradingSymbol>LGND</issuerTradingSymbol>
    </issuer>

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            <rptOwnerName>Herman Melanie J</rptOwnerName>
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            <rptOwnerStreet1>11119 NORTH TORREY PINES ROAD, SUITE 200</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
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            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92037</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Director of Accounting</officerTitle>
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            <transactionDate>
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            <transactionDate>
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                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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            </securityTitle>
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            </conversionOrExercisePrice>
            <transactionDate>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            </exerciseDate>
            <expirationDate>
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            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
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            </conversionOrExercisePrice>
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            <transactionAmounts>
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                <transactionPricePerShare>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <expirationDate>
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            <securityTitle>
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                <value>2015-11-11</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>625.0</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <value>2024-04-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>625</value>
                </underlyingSecurityShares>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3625</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
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                <value>2015-11-11</value>
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                <value>2015-11-11</value>
            </deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>2500.0</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F7"/>
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            <expirationDate>
                <value>2024-02-12</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>3500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Grant to reporting person of options, exercisable over a 4-year period measured from the date of grant, 12-1/2% after six months, then 1/48th of the Option Shares per month thereafter.  The date of grant is 05/02/2011.</footnote>
        <footnote id="F2">Grant to reporting person of options, exercisable over a 4-year period measured from the date of grant, 12-1/2% after six months, then 1/48th of the Option Shares per month thereafter.  The date of grant is 01/03/12.</footnote>
        <footnote id="F3">Grant to reporting person of options, exercisable over a 4-year period measured from the date of grant, 12-1/2% after six months, then 1/48th of the Option Shares per month thereafter.  The date of grant is 02/09/12.</footnote>
        <footnote id="F4">Grant to reporting person of options, exercisable over a 4-year period measured from the date of grant, 12-1/2% after six months, then 1/48th of the Option Shares per month thereafter.  The date of grant is 02/15/13.</footnote>
        <footnote id="F5">Grant to reporting person of options, exercisable over a 4-year period measured from the date of grant, 12-1/2% after six months, then 1/48th of the Option Shares per month thereafter.  The date of grant is 02/10/15.</footnote>
        <footnote id="F6">Grant to reporting person of options, exercisable over a 4-year period measured from the date of grant, 12-1/2% after six months, then 1/48th of the Option Shares per month thereafter.  The date of grant is 04/01/2014.</footnote>
        <footnote id="F7">Grant to reporting person of options, exercisable over a 4-year period measured from the date of grant, 12-1/2% after six months, then 1/48th of the Option Shares per month thereafter.  The date of grant is 02/12/14.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: Charles S. Berkman For: Melanie J. Herman</signatureName>
        <signatureDate>2015-11-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
