<?xml version="1.0" encoding="utf-8"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
  <periodOfReport>2003-07-28</periodOfReport>
  <notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0001034842</issuerCik>
        <issuerName>RIGEL PHARMACEUTICALS INC</issuerName>
        <issuerTradingSymbol>RIGL</issuerTradingSymbol>
  </issuer>
  <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001190277</rptOwnerCik>
            <rptOwnerName>GROSSBARD ELLIOT B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>240 EAST GRAND AVE.,</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SOUTH SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94080</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
      <isDirector>0</isDirector>
      <isOfficer>1</isOfficer>
      <isTenPercentOwner>0</isTenPercentOwner>
      <isOther>0</isOther>
      <officerTitle>Sr. VP of Med. Dev.</officerTitle>
    </reportingOwnerRelationship>
  </reportingOwner>
  <derivativeTable>
    <derivativeTransaction>
      <securityTitle>
        <value>Stock Option (right to buy)</value>
      </securityTitle>
      <conversionOrExercisePrice>
        <value>33.66</value>
      </conversionOrExercisePrice>
      <transactionDate>
        <value>2003-07-28</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>D</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value/>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>27778</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>0</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
        <footnoteId id="F1"/>
      </exerciseDate>
      <expirationDate>
        <value>2012-04-09</value>
      </expirationDate>
      <underlyingSecurity>
        <underlyingSecurityTitle>
          <value>Common Stock</value>
        </underlyingSecurityTitle>
        <underlyingSecurityShares>
          <value>27778</value>
        </underlyingSecurityShares>
      </underlyingSecurity>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>0</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </derivativeTransaction>
    <derivativeTransaction>
      <securityTitle>
        <value>Stock Option (right to buy)</value>
      </securityTitle>
      <conversionOrExercisePrice>
        <value>9.20</value>
      </conversionOrExercisePrice>
      <transactionDate>
        <value>2003-07-28</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>A</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value/>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>27778</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>0</value>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>A</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
        <footnoteId id="F2"/>
      </exerciseDate>
      <expirationDate>
        <value>2006-07-28</value>
        <footnoteId id="F3"/>
      </expirationDate>
      <underlyingSecurity>
        <underlyingSecurityTitle>
          <value>Common Stock</value>
        </underlyingSecurityTitle>
        <underlyingSecurityShares>
          <value>27778</value>
        </underlyingSecurityShares>
      </underlyingSecurity>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>27778</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </derivativeTransaction>
  </derivativeTable>
  <footnotes>
    <footnote id="F1">Vests 25% at 1 year anniversary from hire date of April 1, 2002, then monthly over last 3 years.</footnote>
    <footnote id="F2">Vests 20% at 6-month anniversary from July 28, 2003, 20% at 1 year anniversary of July 28, 2003 grant date and remaining 60% vests monthly over the last 2 years.</footnote>
    <footnote id="F3">Life is 3 years + 5 business days.</footnote>
  </footnotes>
  <ownerSignature>
    <signatureName>/s/ James H. Welch, Attorney-in-fact for Reporting Person</signatureName>
    <signatureDate>2003-07-28</signatureDate>
  </ownerSignature>
</ownershipDocument>

