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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001181431-08-022626.txt : 20080401
<SEC-HEADER>0001181431-08-022626.hdr.sgml : 20080401
<ACCEPTANCE-DATETIME>20080401210703
ACCESSION NUMBER:		0001181431-08-022626
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080328
FILED AS OF DATE:		20080401
DATE AS OF CHANGE:		20080401

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ARBINET THEXCHANGE INC
		CENTRAL INDEX KEY:			0001136655
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
		IRS NUMBER:				133930916
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		120 ALBANY STREET, TOWER II
		STREET 2:		SUITE 450
		CITY:			NEW BRUNSWICK
		STATE:			NJ
		ZIP:			08901
		BUSINESS PHONE:		7325099100

	MAIL ADDRESS:	
		STREET 1:		120 ALBANY STREET, TOWER II
		STREET 2:		SUITE 450
		CITY:			NEW BRUNSWICK
		STATE:			NJ
		ZIP:			08901

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Sach Peter P
		CENTRAL INDEX KEY:			0001310812

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51063
		FILM NUMBER:		08731105

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		732-509-9100

	MAIL ADDRESS:	
		STREET 1:		C/O ARBINET-THEXCHANGE, INC.
		STREET 2:		120 ALBANY STREET, TOWER II, SUITE 450
		CITY:			NEW BRUNSWICK
		STATE:			NJ
		ZIP:			08901
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd201864.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-03-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001136655</issuerCik>
        <issuerName>ARBINET THEXCHANGE INC</issuerName>
        <issuerTradingSymbol>ARBX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001310812</rptOwnerCik>
            <rptOwnerName>Sach Peter P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ARBINET-THEXCHANGE, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>120 ALBANY STREET, TOWER II, SUITE 450</rptOwnerStreet2>
            <rptOwnerCity>NEW BRUNSWICK</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08901</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Operating Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-03-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2158</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>39628</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Such shares represent an adjustment to two restricted stock unit awards previously granted to Mr. Sach, such adjustment being made in connection with the special one-time cash distribution made on the issuer's common stock in the amount of $0.40 per share.</footnote>
        <footnote id="F2">Includes (a) 16,782 restricted stock units which vest in equal parts on each of March 2, 2009 and March 1, 2010; (b) 8,209 restricted stock units which vest on August 25, 2008 and (c) 14,637 shares of common stock held by Mr. Sach.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Peter P Sach</signatureName>
        <signatureDate>2008-04-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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