-----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,
 R8AMrgf29rO35souTjumycQxjNLLATSM4eEpdRo3lVFHuZ0AxKjY+rgxxZQ1YKjT
 fXusPA9+xlY123DAxekshA==

<SEC-DOCUMENT>0001272704-07-000004.txt : 20071121
<SEC-HEADER>0001272704-07-000004.hdr.sgml : 20071121
<ACCEPTANCE-DATETIME>20071121115412
ACCESSION NUMBER:		0001272704-07-000004
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20071116
FILED AS OF DATE:		20071121
DATE AS OF CHANGE:		20071121

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MGT CAPITAL INVESTMENTS INC
		CENTRAL INDEX KEY:			0001001601
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				133758042
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		KENSINGTON CENTRE
		STREET 2:		66 HAMMERSMITH ROAD
		CITY:			LONDON
		STATE:			X0
		ZIP:			W14 8UD
		BUSINESS PHONE:		011 44 207 605 7950

	MAIL ADDRESS:	
		STREET 1:		KENSINGTON CENTRE
		STREET 2:		66 HAMMERSMITH ROAD
		CITY:			LONDON
		STATE:			X0
		ZIP:			W14 8UD

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MEDICSIGHT INC
		DATE OF NAME CHANGE:	20021113

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	HTTP TECHNOLOGY INC
		DATE OF NAME CHANGE:	20001016

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERNET HOLDINGS INC
		DATE OF NAME CHANGE:	19980520

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PATERSON BROWN TIM
		CENTRAL INDEX KEY:			0001272704

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32698
		FILM NUMBER:		071262078

	BUSINESS ADDRESS:	
		STREET 1:		MEDICSIGHT INC
		STREET 2:		46 BERKELEY SQUARE
		CITY:			LONDON, UNITED KINGDOM
		STATE:			X0
		ZIP:			W1J5AT
		BUSINESS PHONE:		011442076057950

	MAIL ADDRESS:	
		STREET 1:		KENSINGTON CENTRE
		STREET 2:		66 HAMMERSMITH ROAD
		CITY:			LONDON
		STATE:			X0
		ZIP:			W14 8UD
</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>2007-11-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001001601</issuerCik>
        <issuerName>MGT CAPITAL INVESTMENTS INC</issuerName>
        <issuerTradingSymbol>MGT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001272704</rptOwnerCik>
            <rptOwnerName>PATERSON BROWN TIM</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>KENSINGTON CENTRE</rptOwnerStreet1>
            <rptOwnerStreet2>66 HAMMERSMITH ROAD</rptOwnerStreet2>
            <rptOwnerCity>LONDON</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>W14 8UD</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CHAIRMAN &amp; CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>COMMON STOCK</value>
            </securityTitle>
            <transactionDate>
                <value>2007-11-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>500000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.5</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2000000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>TIM PATERSON-BROWN</signatureName>
        <signatureDate>2007-11-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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