-----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,
 BS5CoyqvrlWLqoOwTmwNQsxDx8nuZWQTVRHKsnI/IJ/sBHCetITKe88cx8YkkEVh
 xJr22uW+wKdmJQiLB9zqHw==

<SEC-DOCUMENT>0001235802-08-000068.txt : 20080506
<SEC-HEADER>0001235802-08-000068.hdr.sgml : 20080506
<ACCEPTANCE-DATETIME>20080506214632
ACCESSION NUMBER:		0001235802-08-000068
CONFORMED SUBMISSION TYPE:	3/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20080502
FILED AS OF DATE:		20080506
DATE AS OF CHANGE:		20080506

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Keong Koh Soo
		CENTRAL INDEX KEY:			0001434271

	FILING VALUES:
		FORM TYPE:		3/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-15010
		FILM NUMBER:		08808052

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		763-225-6600

	MAIL ADDRESS:	
		STREET 1:		4201 WOODLAND ROAD
		STREET 2:		POST OFFICE BOX 69
		CITY:			CIRCLE PINES
		STATE:			MN
		ZIP:			55014

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MARTEN TRANSPORT LTD
		CENTRAL INDEX KEY:			0000799167
		STANDARD INDUSTRIAL CLASSIFICATION:	TRUCKING (NO LOCAL) [4213]
		IRS NUMBER:				391140809
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		129 MARTEN ST
		CITY:			MONDOVI
		STATE:			WI
		ZIP:			54755
		BUSINESS PHONE:		7159264216

	MAIL ADDRESS:	
		STREET 1:		3400 PLAZA VII
		STREET 2:		45 SOUTH SEVENTH ST
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402
</SEC-HEADER>
<DOCUMENT>
<TYPE>3/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2008-05-02</periodOfReport>

    <dateOfOriginalSubmission>2008-05-06</dateOfOriginalSubmission>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000799167</issuerCik>
        <issuerName>MARTEN TRANSPORT LTD</issuerName>
        <issuerTradingSymbol>NTI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001434271</rptOwnerCik>
            <rptOwnerName>Keong Koh Soo</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>4201 WOODLAND ROAD</rptOwnerStreet1>
            <rptOwnerStreet2>POST OFFICE BOX 69</rptOwnerStreet2>
            <rptOwnerCity>CIRCLE PINES</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55014</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Mr. Koh is not a director</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>This form was inadvertently filed under Marten Transport's CIK.  This form should have been filed under Northern Technologies International Corporation's CIK.  Mr. Koh is not a director of Marten Transport.</remarks>

    <ownerSignature>
        <signatureName>/s/ Matthew Wolsfeld, attorney-in-fact</signatureName>
        <signatureDate>2008-05-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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