-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 IMqYc8xTH237iiz92uHCjDQrYnmdN4x2qgUHYi7gGfxMQEHL1q4sFbXcZ8H2CfOR
 ChQqOk/TAYjghLaMIpxNYA==

<SEC-DOCUMENT>0001104659-03-018277.txt : 20030814
<SEC-HEADER>0001104659-03-018277.hdr.sgml : 20030814
<ACCEPTANCE-DATETIME>20030813194035
ACCESSION NUMBER:		0001104659-03-018277
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030811
FILED AS OF DATE:		20030813

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OAK TECHNOLOGY INC
		CENTRAL INDEX KEY:			0000824225
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				770161486
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		139 KIFER CT
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94086
		BUSINESS PHONE:		4087370888

	MAIL ADDRESS:	
		STREET 1:		139 KIFER COURT
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94086

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			RYNNE DAVID
		CENTRAL INDEX KEY:			0001223716

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-25298
		FILM NUMBER:		03843031

	BUSINESS ADDRESS:	
		STREET 1:		1390 KIFER ROAD
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94086
		BUSINESS PHONE:		40815236500

	MAIL ADDRESS:	
		STREET 1:		1390 KIFER ROAD
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94086
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0" encoding="utf-8"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
  <periodOfReport>2003-08-11</periodOfReport>
  <notSubjectToSection16>1</notSubjectToSection16>
    <issuer>
        <issuerCik>0000824225</issuerCik>
        <issuerName>OAK TECHNOLOGY INC</issuerName>
        <issuerTradingSymbol>OAKT</issuerTradingSymbol>
  </issuer>
  <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001223716</rptOwnerCik>
            <rptOwnerName>RYNNE DAVID</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1390 KIFER ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SUNNYVALE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94086</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
      <isDirector>1</isDirector>
      <isOfficer>0</isOfficer>
      <isTenPercentOwner>0</isTenPercentOwner>
      <isOther>0</isOther>
    </reportingOwnerRelationship>
  </reportingOwner>
  <derivativeTable>
    <derivativeTransaction>
      <securityTitle>
        <value>Stock Option (Right to Buy)</value>
      </securityTitle>
      <conversionOrExercisePrice>
        <value>10.41</value>
      </conversionOrExercisePrice>
      <transactionDate>
        <value>2003-08-11</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>D</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>20000</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>0</value>
          <footnoteId id="F2"/>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
        <footnoteId id="F1"/>
      </exerciseDate>
      <expirationDate>
        <value>2011-06-13</value>
      </expirationDate>
      <underlyingSecurity>
        <underlyingSecurityTitle>
          <value>Common Stock</value>
        </underlyingSecurityTitle>
        <underlyingSecurityShares>
          <value>20000</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>10.41</value>
      </conversionOrExercisePrice>
      <transactionDate>
        <value>2003-08-11</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>D</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>30000</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>0</value>
          <footnoteId id="F3"/>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
        <footnoteId id="F1"/>
      </exerciseDate>
      <expirationDate>
        <value>2011-06-13</value>
      </expirationDate>
      <underlyingSecurity>
        <underlyingSecurityTitle>
          <value>Common Stock</value>
        </underlyingSecurityTitle>
        <underlyingSecurityShares>
          <value>30000</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>15.51</value>
      </conversionOrExercisePrice>
      <transactionDate>
        <value>2003-08-11</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>D</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>12500</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>0</value>
          <footnoteId id="F4"/>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
        <footnoteId id="F1"/>
      </exerciseDate>
      <expirationDate>
        <value>2012-02-05</value>
      </expirationDate>
      <underlyingSecurity>
        <underlyingSecurityTitle>
          <value>Common Stock</value>
        </underlyingSecurityTitle>
        <underlyingSecurityShares>
          <value>12500</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>2.50</value>
      </conversionOrExercisePrice>
      <transactionDate>
        <value>2003-08-11</value>
      </transactionDate>
      <transactionCoding>
        <transactionFormType>4</transactionFormType>
        <transactionCode>D</transactionCode>
        <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionTimeliness>
        <value></value>
      </transactionTimeliness>
      <transactionAmounts>
        <transactionShares>
          <value>17708</value>
        </transactionShares>
        <transactionPricePerShare>
          <value>0</value>
          <footnoteId id="F5"/>
        </transactionPricePerShare>
        <transactionAcquiredDisposedCode>
          <value>D</value>
        </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <exerciseDate>
        <footnoteId id="F1"/>
      </exerciseDate>
      <expirationDate>
        <value>2012-12-23</value>
      </expirationDate>
      <underlyingSecurity>
        <underlyingSecurityTitle>
          <value>Common Stock</value>
        </underlyingSecurityTitle>
        <underlyingSecurityShares>
          <value>17708</value>
        </underlyingSecurityShares>
      </underlyingSecurity>
      <postTransactionAmounts>
        <sharesOwnedFollowingTransaction>
          <value>0</value>
        </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
        <directOrIndirectOwnership>
          <value>D</value>
        </directOrIndirectOwnership>
      </ownershipNature>
    </derivativeTransaction>
  </derivativeTable>
  <footnotes>
    <footnote id="F1">All of these options vested in full immediately prior to the merger </footnote>
    <footnote id="F2">This option was assumed by Zoran Corporation in the merger and replaced with an option to purchase 6,666 shares of Zoran common stock for $31.23 per share, pursuant to the Agreement and Plan of Reorganization dated May 4, 2003 between the issuer and Zoran (as amended the "Merger Agreement")</footnote>
    <footnote id="F3">This option was assumed by Zoran in the merger and replaced with an option to purchase 9,999 shares of Zoran common stock for $31.23 per share, pursuant to the Merger Agreement.</footnote>
    <footnote id="F4">This option was assumed by Zoran in the merger and replaced with an option to purchase 4,166 shares of Zoran common stock for $46.53 per share, pursuant to the Merger Agreement.</footnote>
    <footnote id="F5">This option was assumed by Zoran in the merger and replaced with an option to purchase 5,902 shares of Zoran common stock for $7.50 per share, pursuant to the Merger Agreement.</footnote>
  </footnotes>
  <ownerSignature>
    <signatureName>John S. Edmunds, by power of attorney</signatureName>
    <signatureDate>2003-08-11</signatureDate>
  </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----