-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 IWRRKSVgN4QkDnoajMLQMhP939Z7CX4/ICw6ReYw3nCxWvQdPekxvRVtvWS62Rwa
 JS84ytaHRdGJq/yaUzAc9A==

<SEC-DOCUMENT>0001185232-05-000001.txt : 20050701
<SEC-HEADER>0001185232-05-000001.hdr.sgml : 20050701
<ACCEPTANCE-DATETIME>20050701112134
ACCESSION NUMBER:		0001185232-05-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050630
FILED AS OF DATE:		20050701
DATE AS OF CHANGE:		20050701

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BAY MOGENS C
		CENTRAL INDEX KEY:			0001185232

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23943
		FILM NUMBER:		05930962

	BUSINESS ADDRESS:	
		STREET 1:		VALMONT INDUSTRIES INC
		STREET 2:		ONE VALMONT PLAZA
		CITY:			OMAHA
		STATE:			NE
		ZIP:			68154-5215
		BUSINESS PHONE:		4029631000

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PETER KIEWIT SONS INC /DE/
		CENTRAL INDEX KEY:			0001044430
		STANDARD INDUSTRIAL CLASSIFICATION:	HEAVY CONSTRUCTION OTHER THAN BUILDING CONST - CONTRACTORS [1600]
		IRS NUMBER:				911842817
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1000 KIEWIT PLAZA
		STREET 2:		3555 FARNAM STREET
		CITY:			OMAHA
		STATE:			NE
		ZIP:			68131
		BUSINESS PHONE:		4023422052

	MAIL ADDRESS:	
		STREET 1:		1000 KIEWIT PLAZA
		STREET 2:		3555 FARNAM STREET
		CITY:			OMAHA
		STATE:			NE
		ZIP:			68131

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PKS HOLDINGS INC
		DATE OF NAME CHANGE:	19970813
</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>2005-06-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001044430</issuerCik>
        <issuerName>PETER KIEWIT SONS INC /DE/</issuerName>
        <issuerTradingSymbol>None</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001185232</rptOwnerCik>
            <rptOwnerName>BAY MOGENS C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity></rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>$0.01 Par Value Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2005-06-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4978</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>37.55</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8122</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>Mogens C. Bay, by Christine D. Kenny, POA</signatureName>
        <signatureDate>2005-06-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----