<SEC-DOCUMENT>0001012975-15-000251.txt : 20150326
<SEC-HEADER>0001012975-15-000251.hdr.sgml : 20150326
<ACCEPTANCE-DATETIME>20150326165408
ACCESSION NUMBER:		0001012975-15-000251
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20150324
FILED AS OF DATE:		20150326
DATE AS OF CHANGE:		20150326

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MEI Pharma, Inc.
		CENTRAL INDEX KEY:			0001262104
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				510407811
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		11975 EL CAMINO REAL
		STREET 2:		SUITE 101
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92130
		BUSINESS PHONE:		858-792-6300

	MAIL ADDRESS:	
		STREET 1:		11975 EL CAMINO REAL
		STREET 2:		SUITE 101
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92130

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MARSHALL EDWARDS INC
		DATE OF NAME CHANGE:	20030902

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ratcliffe Liam
		CENTRAL INDEX KEY:			0001547100

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50484
		FILM NUMBER:		15728313

	MAIL ADDRESS:	
		STREET 1:		C/O NEW LEAF VENTURE PARTNERS
		STREET 2:		7 TIMES SQUARE - SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Delagardelle Jeani
		CENTRAL INDEX KEY:			0001441563

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50484
		FILM NUMBER:		15728314

	MAIL ADDRESS:	
		STREET 1:		C/O NEW LEAF VENTURE PARTNERS, L.L.C.
		STREET 2:		2500 SAND HILL ROAD, SUITE 203
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HUNT RONALD
		CENTRAL INDEX KEY:			0001247851

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50484
		FILM NUMBER:		15728316

	MAIL ADDRESS:	
		STREET 1:		C/O CREDIT SUISSE 1ST BOSTON PRV EQY
		STREET 2:		11 MADISON AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10010

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Chambon Philippe O.
		CENTRAL INDEX KEY:			0001192212

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50484
		FILM NUMBER:		15728317

	MAIL ADDRESS:	
		STREET 1:		C/O NEW LEAF VENTURE PARTNERS
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHAMBON PHILIPPE
		DATE OF NAME CHANGE:	20020924

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			New Leaf Venture Management II, L.L.C.
		CENTRAL INDEX KEY:			0001441857
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50484
		FILM NUMBER:		15728318

	BUSINESS ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		646 871-6400

	MAIL ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			New Leaf Ventures II, L.P.
		CENTRAL INDEX KEY:			0001441439
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50484
		FILM NUMBER:		15728320

	BUSINESS ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		(646) 871-6400

	MAIL ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Lathi Vijay K
		CENTRAL INDEX KEY:			0001340806

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50484
		FILM NUMBER:		15728315

	MAIL ADDRESS:	
		STREET 1:		C/O NEW LEAF VENTURE PARTNERS
		STREET 2:		2500 SAND HILL ROAD, SUITE 203
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			New Leaf Venture Associates II, L.P.
		CENTRAL INDEX KEY:			0001441858
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50484
		FILM NUMBER:		15728319

	BUSINESS ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		646 871-6400

	MAIL ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
</SEC-HEADER>
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    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-03-24</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001262104</issuerCik>
        <issuerName>MEI Pharma, Inc.</issuerName>
        <issuerTradingSymbol>MEIP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001441439</rptOwnerCik>
            <rptOwnerName>New Leaf Ventures II, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURES</rptOwnerStreet1>
            <rptOwnerStreet2>TIMES SQUARE TOWER, 7 TIMES SQ, STE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001441858</rptOwnerCik>
            <rptOwnerName>New Leaf Venture Associates II, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURES</rptOwnerStreet1>
            <rptOwnerStreet2>TIMES SQUARE TOWER, 7 TIMES SQ, STE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
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            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001441857</rptOwnerCik>
            <rptOwnerName>New Leaf Venture Management II, L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURES</rptOwnerStreet1>
            <rptOwnerStreet2>TIMES SQUARE TOWER, 7 TIMES SQ, STE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001192212</rptOwnerCik>
            <rptOwnerName>Chambon Philippe O.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURES</rptOwnerStreet1>
            <rptOwnerStreet2>TIMES SQUARE TOWER, 7 TIMES SQ, STE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001247851</rptOwnerCik>
            <rptOwnerName>HUNT RONALD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURES</rptOwnerStreet1>
            <rptOwnerStreet2>TIMES SQUARE TOWER, 7 TIMES SQ, STE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001340806</rptOwnerCik>
            <rptOwnerName>Lathi Vijay K</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURES</rptOwnerStreet1>
            <rptOwnerStreet2>1200 PARK PLACE, SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>SAN MATEO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94403</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001441563</rptOwnerCik>
            <rptOwnerName>Delagardelle Jeani</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURES</rptOwnerStreet1>
            <rptOwnerStreet2>1200 PARK PLACE, SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>SAN MATEO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94403</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001547100</rptOwnerCik>
            <rptOwnerName>Ratcliffe Liam</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURES</rptOwnerStreet1>
            <rptOwnerStreet2>TIMES SQUARE TOWER, 7 TIMES SQ, STE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-03-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1601390</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.9734</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares directly beneficially owned by New Leaf Ventures II, L.P. (&quot;NLV II&quot;). New Leaf Venture Associates II, L.P. (&quot;NLV Associates&quot;) is the general partner of NLV II and New Leaf Venture Management II, L.L.C. (&quot;NLV Management&quot;) is the general partner of NLV Associates. Philippe O. Chambon, Jeani Delagardelle, Ronald Hunt, Vijay Lathi, and Liam Ratcliffe are the individual managers of NLV Management (the &quot;Individual Managers&quot;). NLV Associates and NLV Management disclaim beneficial ownership of such shares, except to the extent of their pecuniary interest therein. As one of five individual managers, each of the Individual Managers disclaims beneficial ownership over the shares reported herein, and in all events disclaims pecuniary interest except to the extent of his economic interest.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, Chief Financial Officer of New Leaf Venture Management II, L.L.C., the sole general partner of New Leaf Venture Associates II, L.P., the sole general partner of New Leaf Ventures II, L.P.</signatureName>
        <signatureDate>2015-03-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, Chief Financial Officer of New Leaf Venture Management II, L.L.C., the sole general partner of New Leaf Venture Associates II, L.P.</signatureName>
        <signatureDate>2015-03-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, Chief Financial Officer of New Leaf Venture Management II, L.L.C.</signatureName>
        <signatureDate>2015-03-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, as Attorney-in-Fact for Philippe O. Chambon</signatureName>
        <signatureDate>2015-03-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, as Attorney-in-Fact for Ronald Hunt</signatureName>
        <signatureDate>2015-03-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, as Attorney-in-Fact for Vijay Lathi</signatureName>
        <signatureDate>2015-03-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, as Attorney-in-Fact for Jeani Delagardelle</signatureName>
        <signatureDate>2015-03-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, as Attorney-in-Fact for Liam Ratcliffe</signatureName>
        <signatureDate>2015-03-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
