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<SEC-DOCUMENT>0001209191-06-028440.txt : 20060508
<SEC-HEADER>0001209191-06-028440.hdr.sgml : 20060508
<ACCEPTANCE-DATETIME>20060508181141
ACCESSION NUMBER:		0001209191-06-028440
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060508
FILED AS OF DATE:		20060508
DATE AS OF CHANGE:		20060508

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KOMAG INC /DE/
		CENTRAL INDEX KEY:			0000813347
		STANDARD INDUSTRIAL CLASSIFICATION:	MAGNETIC & OPTICAL RECORDING MEDIA [3695]
		IRS NUMBER:				942914864
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0102

	BUSINESS ADDRESS:	
		STREET 1:		1710 AUTOMATION PWY
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95131
		BUSINESS PHONE:		4085762000

	MAIL ADDRESS:	
		STREET 1:		1710 AUTOMATION PWY
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95131

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			TAN THIAN H
		CENTRAL INDEX KEY:			0001230579

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-16852
		FILM NUMBER:		06818071

	BUSINESS ADDRESS:	
		STREET 1:		KOMAG INCORPORATED
		STREET 2:		1710 AUTOMATION PARKWAY
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95131
		BUSINESS PHONE:		4085762000
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
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    <schemaVersion>X0202</schemaVersion>

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            <rptOwnerState>CA</rptOwnerState>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                    <value>162750</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                <value>Common Stock</value>
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                <value></value>
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                <transactionShares>
                    <value>800</value>
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                <transactionPricePerShare>
                    <value>44.70</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <value>Common Stock</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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                <transactionShares>
                    <value>200</value>
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                <transactionPricePerShare>
                    <value>44.71</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>161750</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">This trade was executed pursuant to a Rule 10b5-1 trading plan.</footnote>
    </footnotes>

    <remarks>Form 4 Filing 1 of 2 (continuation report): Related transactions effected by the Reporting Person on 05/08/2006 are reported on additional Form 4s.</remarks>

    <ownerSignature>
        <signatureName>/s/ Jan Schwartz, Attorney-in-fact for Thian Hoo Tan</signatureName>
        <signatureDate>2006-05-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----