<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2013-04-11</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001313911</issuerCik>
        <issuerName>Rally Software Development Corp</issuerName>
        <issuerTradingSymbol>RALY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001116442</rptOwnerCik>
            <rptOwnerName>MOBIUS VI LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1050 WALNUT STREET, SUITE 210</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOULDER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001135833</rptOwnerCik>
            <rptOwnerName>MOBIUS TECHNOLOGY VENTURES VI LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1050 WALNUT STREET, SUITE 210</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOULDER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001135837</rptOwnerCik>
            <rptOwnerName>SOFTBANK U S VENTURES VI L P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1050 WALNUT STREET, SUITE 210</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOULDER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001135834</rptOwnerCik>
            <rptOwnerName>MOBIUS TECHNOLOGY VENTURES SIDE FUND VI L P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1050 WALNUT STREET, SUITE 210</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOULDER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001135836</rptOwnerCik>
            <rptOwnerName>MOBIUS TECHNOLOGY VENTURES ADVISORS FUND VI L P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1050 WALNUT STREET, SUITE 210</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOULDER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001065270</rptOwnerCik>
            <rptOwnerName>FELD BRADLEY A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1050 WALNUT STREET, SUITE 210</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOULDER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001248191</rptOwnerCik>
            <rptOwnerName>MENDELSON JASON A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1050 WALNUT STREET, SUITE 210</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOULDER</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80302</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Series A-1 Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <expirationDate>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>669521</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Mobius Technology Ventures VI,L.P.</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series A-1 Preferred Stock</value>
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            <conversionOrExercisePrice>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>718084</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By SOFTBANK U.S. Ventures VI, L.P.</value>
                    <footnoteId id="F5"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
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        <derivativeHolding>
            <securityTitle>
                <value>Series A-1 Preferred Stock</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                <underlyingSecurityShares>
                    <value>27380</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Mobius Technology Ventures Side Fund VI, L.P.</value>
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            </underlyingSecurity>
            <ownershipNature>
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                    <value>By Mobius Technology Ventures Advisors Fund VI, L.P.</value>
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            <ownershipNature>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>102878</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By SOFTBANK U.S. Ventures VI, L.P.</value>
                    <footnoteId id="F5"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series E Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3922</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Mobius Technology Ventures Side Fund VI, L.P.</value>
                    <footnoteId id="F6"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Series E Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3736</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Mobius Technology Ventures Advisors Fund VI, L.P.</value>
                    <footnoteId id="F7"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Warrant to Purchase Series C Preferred Stock (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.78</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F9"/>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-05-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Series C Preferred Stock</value>
                    <footnoteId id="F11"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6046</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Mobius Technology Ventures VI,L.P.</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Warrant to Purchase Series C Preferred Stock (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.78</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F9"/>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-05-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Series C Preferred Stock</value>
                    <footnoteId id="F11"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6485</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By SOFTBANK U.S. Ventures VI, L.P.</value>
                    <footnoteId id="F5"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Warrant to Purchase Series C Preferred Stock (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.78</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F9"/>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-05-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Series C Preferred Stock</value>
                    <footnoteId id="F11"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>247</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Mobius Technology Ventures Side Fund VI, L.P.</value>
                    <footnoteId id="F6"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Warrant to Purchase Series C Preferred Stock (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.78</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F9"/>
                <footnoteId id="F10"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-05-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Series C Preferred Stock</value>
                    <footnoteId id="F11"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>235</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Mobius Technology Ventures Advisors Fund VI, L.P.</value>
                    <footnoteId id="F7"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Immediately convertible into shares of the Issuer's Common Stock at the Reporting Person's election.</footnote>
        <footnote id="F2">Each share of Series A-1 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock will automatically convert on a 1-for-1 basis into shares of the Issuer's Common Stock immediately upon the closing of a Qualified Public Offering (as defined in the Issuer's Amended and Restated Certificate of Incorporation, as filed with the Delaware Secretary of State on April 1, 2013).</footnote>
        <footnote id="F3">The shares do not have an expiration date.</footnote>
        <footnote id="F4">The securities are held by Mobius Technology Ventures VI, L.P. (&quot;Mobius Technology VI&quot;).</footnote>
        <footnote id="F5">The securities are held by SOFTBANK U.S. Ventures VI, L.P. (&quot;Softbank&quot;).</footnote>
        <footnote id="F6">The securities are held by Mobius Technology Ventures Side Fund VI, L.P. (&quot;Mobius Side Fund&quot;).</footnote>
        <footnote id="F7">The securities are held by Mobius Technology Ventures Advisors Fund VI, L.P. (&quot;Mobius Advisors Fund&quot;).</footnote>
        <footnote id="F8">Mobius VI LLC (&quot;Mobius VI&quot;) is the General Partner of Mobius Technology VI, Softbank, Mobius Side Fund and Mobius Advisors Fund (collectively, the &quot;Mobius Funds&quot;).  Mobius VI may be deemed to indirectly beneficially own the securities owned by the Mobius Funds.  Bradley A. Feld and Jason Mendelson are Managing Directors of Mobius VI and each share voting and dispositive power over the securities held by Mobius Funds.  Each disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.</footnote>
        <footnote id="F9">Immediately exercisable.</footnote>
        <footnote id="F10">The warrant will automatically convert on a 1-for-1 basis into a warrant to purchase shares of the Issuer's Common Stock immediately upon the closing of a Qualified Public Offering.</footnote>
        <footnote id="F11">Immediately upon the closing of a Qualified Public Offering of the Issuer, the warrant will automatically convert into a warrant to purchase shares of the Issuer's Common Stock.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Mobius VI L.L.C. By: /s/ Bradley A. Feld, Managing Member</signatureName>
        <signatureDate>2013-04-11</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Mobius Technology Ventures VI, L.P. By: Mobius VI L.L.C. By: /s/ Bradley A. Feld, Managing Member</signatureName>
        <signatureDate>2013-04-11</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>SOFTBANK U.S. Ventures VI, L.P. By: Mobius VI L.L.C. By: /s/ Bradley A. Feld, Managing Member</signatureName>
        <signatureDate>2013-04-11</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Mobius Technology Ventures Side Fund VI, L.P. By: Mobius VI L.L.C. By: /s/ Bradley A. Feld, Managing Member</signatureName>
        <signatureDate>2013-04-11</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Mobius Technology Ventures Advisors Fund VI, L.P. By: Mobius VI L.L.C. By: /s/ Bradley A. Feld, Managing Member</signatureName>
        <signatureDate>2013-04-11</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Bradley A. Feld</signatureName>
        <signatureDate>2013-04-11</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Jason Mendelson</signatureName>
        <signatureDate>2013-04-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
