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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 SpjKUZNr3zK92hhAiGB58T0w10Hqs7iFzpS27gO15kfwtQoyhAlclW7LiCRHimeI
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<SEC-DOCUMENT>0001207682-05-000001.txt : 20051020
<SEC-HEADER>0001207682-05-000001.hdr.sgml : 20051020
<ACCEPTANCE-DATETIME>20051020103520
ACCESSION NUMBER:		0001207682-05-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20051018
FILED AS OF DATE:		20051020
DATE AS OF CHANGE:		20051020

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEABOARD CORP /DE/
		CENTRAL INDEX KEY:			0000088121
		STANDARD INDUSTRIAL CLASSIFICATION:	MEAT PACKING PLANTS [2011]
		IRS NUMBER:				042260388
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		9000 W. 67TH STREET
		CITY:			SHAWNEE MISSION
		STATE:			KS
		ZIP:			66202
		BUSINESS PHONE:		9136768800

	MAIL ADDRESS:	
		STREET 1:		9000 W. 67TH STREET
		CITY:			SHAWNEE MISSION
		STATE:			KS
		ZIP:			66202

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SEABOARD ALLIED MILLING CORP
		DATE OF NAME CHANGE:	19820328

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	HATHAWAY BAKERIES INC
		DATE OF NAME CHANGE:	19710315

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BRESKY H HARRY
		CENTRAL INDEX KEY:			0001207682

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-03390
		FILM NUMBER:		051146500

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		6177394480

	MAIL ADDRESS:	
		STREET 1:		822 BOYLSTON STREET
		STREET 2:		SUITE 301
		CITY:			CHESTNUT HILL
		STATE:			MA
		ZIP:			02467
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-10-18</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000088121</issuerCik>
        <issuerName>SEABOARD CORP /DE/</issuerName>
        <issuerTradingSymbol>SEB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001207682</rptOwnerCik>
            <rptOwnerName>BRESKY H HARRY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>822 BOYLSTON STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 301</rptOwnerStreet2>
            <rptOwnerCity>CHESTNUT HILL</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02467</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-10-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6313.34</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1317.44</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>904844.24</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote 2 below.</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On 10/18/05, Seaboard Flour LLC (&quot;SFLLC&quot;) became entitled to receive 6,313.34 shares of Issuer pursuant to an &quot;earn-out&quot; provision in a reorganization agreement (&quot;Agreement&quot;) dated 10/18/02, between Issuer and SFLLC (successor Seaboard Flour Corporation). The Agreement provides that SFLLC will periodically receive additional shares of Issuer, for no additional consideration, based on formula set forth in the Agreement. The 6,313.34 shares of common stock of Issuer (&quot;Issuer's Shares&quot;) to which this Form 4 applies, were determined on 10/18/05 after completion of review provisions of the Agreement and is based on the per share closing price of Issuer's Shares on The American Stock Exchange for each of the regular trading sessions between 9/19/05 and 9/30/05. SFLLC's right to receive additional Issuer's Shares, including 6,313.34 shares to which this Form 4 applies, became fixed and irrevocable on 10/18/02, the effective date of the transactions c
ontemplated pursuant to the Agreement.</footnote>
        <footnote id="F2">Consists of 5,611 shares held directly by Reporting Perons (&quot;RP&quot;), 893,948.24 shares, including 6,313.34 shares relating to transaction reported on this Form, that RP may be deemed to beneficially own indirectly through SFLLC and 5,285 shares that RP may be deemed to beneficially own indirectly through RP's wife. Except for certain annuities from various trusts for the benefit of the RP's wife and/or issue (which trusts hold common units of SFLLC), RP disclaims beneficial ownership of securities held through SFLLC and this report shall not be deemed an admission that the RP is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the &quot;Exchange Act&quot;) or for any other purpose. The RP disclaims beneficial ownership of securities held through RP's wife, and this report shall not be deemed an admission that RP is the beneficial owner of such securities for purposes of Section 16 of the Exchange Act or fo
r any other purpose.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ H. H. Bresky</signatureName>
        <signatureDate>2005-10-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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