<SEC-DOCUMENT>0001104659-14-046592.txt : 20140624
<SEC-HEADER>0001104659-14-046592.hdr.sgml : 20140624
<ACCEPTANCE-DATETIME>20140617190124
ACCESSION NUMBER:		0001104659-14-046592
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20140613
FILED AS OF DATE:		20140617
DATE AS OF CHANGE:		20140617

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OvaScience, Inc.
		CENTRAL INDEX KEY:			0001544227
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				451472564
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		215 FIRST STREET
		STREET 2:		SUITE 240
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
		BUSINESS PHONE:		617-500-2802

	MAIL ADDRESS:	
		STREET 1:		215 FIRST STREET
		STREET 2:		SUITE 240
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Deer Management Co. LLC
		CENTRAL INDEX KEY:			0001494127
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35890
		FILM NUMBER:		14926388

	BUSINESS ADDRESS:	
		STREET 1:		C/O BESSEMER VENTURE PARTNERS
		STREET 2:		1865 PALMER AVENUE, SUITE 104
		CITY:			LARCHMONT
		STATE:			NY
		ZIP:			10538
		BUSINESS PHONE:		914.833.5300

	MAIL ADDRESS:	
		STREET 1:		C/O BESSEMER VENTURE PARTNERS
		STREET 2:		1865 PALMER AVENUE, SUITE 104
		CITY:			LARCHMONT
		STATE:			NY
		ZIP:			10538
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-06-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001544227</issuerCik>
        <issuerName>OvaScience, Inc.</issuerName>
        <issuerTradingSymbol>OVAS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001494127</rptOwnerCik>
            <rptOwnerName>Deer Management Co. LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BESSEMER VENTURE PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>1865 PALMER AVENUE,  SUITE 104</rptOwnerStreet2>
            <rptOwnerCity>LARCHMONT</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10538</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.43</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-06-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2024-06-13</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The stock option will vest in twelve equal monthly installments at the end of each successive month following June 13, 2014.</footnote>
        <footnote id="F2">Stephen Kraus, an employee of the Reporting Person, serves as the representative of the entities affiliated with the Reporting Person on the Issuer's board of directors and is contractually obligated to assign any fees received for service as a director to the Reporting Person, pursuant to which obligation, the Reporting Person has the right to any shares issuable pursuant to this grant or any proceeds from the sale thereof.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ J. Edmund Colloton, Managing Member</signatureName>
        <signatureDate>2014-06-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
