<SEC-DOCUMENT>0001144204-14-036805.txt : 20140624
<SEC-HEADER>0001144204-14-036805.hdr.sgml : 20140624
<ACCEPTANCE-DATETIME>20140610155122
ACCESSION NUMBER:		0001144204-14-036805
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20130219
FILED AS OF DATE:		20140610
DATE AS OF CHANGE:		20140610

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MEDIFAST INC
		CENTRAL INDEX KEY:			0000910329
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS FOOD PREPARATIONS & KINDRED PRODUCTS [2090]
		IRS NUMBER:				133714405
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		11445 CRONHILL DRIVE
		CITY:			OWINGS MILLS
		STATE:			MD
		ZIP:			21117
		BUSINESS PHONE:		7327640619

	MAIL ADDRESS:	
		STREET 1:		11445 CRONHILL DRIVE
		CITY:			OWINGS MILLS
		STATE:			MD
		ZIP:			21117

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	HEALTHRITE INC
		DATE OF NAME CHANGE:	19951120

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	XX
		DATE OF NAME CHANGE:	19950619

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	00
		DATE OF NAME CHANGE:	19950619

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MILLS JEANNETTE M
		CENTRAL INDEX KEY:			0001440384

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-31573
		FILM NUMBER:		14901990

	MAIL ADDRESS:	
		STREET 1:		C/O MEDIFAST, INC.
		STREET 2:		3600 CRONDALL LANE
		CITY:			OWINGS MILLS
		STATE:			MD
		ZIP:			21117

	FORMER NAME:	
		FORMER CONFORMED NAME:	MILLS JEANETTE M.
		DATE OF NAME CHANGE:	20080721
</SEC-HEADER>
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        <issuerName>MEDIFAST INC</issuerName>
        <issuerTradingSymbol>MED</issuerTradingSymbol>
    </issuer>

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            <rptOwnerStreet2>3600 CRONDALL LANE</rptOwnerStreet2>
            <rptOwnerCity>OWINGS MILLS</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21117</rptOwnerZipCode>
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            <isTenPercentOwner>0</isTenPercentOwner>
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            <officerTitle>Executive Vice President</officerTitle>
            <otherText></otherText>
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    <derivativeTable>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <exerciseDate>
                <footnoteId id="F8"/>
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            <expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2000</value>
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                <transactionPricePerShare>
                    <value>0.00</value>
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                    <value>A</value>
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                <footnoteId id="F8"/>
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                <value>2024-02-05</value>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                    <value>3167</value>
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    <footnotes>
        <footnote id="F1">These shares were granted to the reporting person under the 2012 Share Incentive Plan for satisfactory participation on the Board of Directors.  These shares will vest in full on 1/1/2015.  A portion of these shares were subsequently forfeited by the reporting person (see Footnote 3 below).</footnote>
        <footnote id="F2">These shares were granted to the reporting person under the 2012 Share Incentive Plan for satisfactory participation on the Board of Directors.  These shares will vest in full on 2/5/2014.</footnote>
        <footnote id="F3">These shares represent a portion of the shares described in Footnote 1, which were forfeited by the reporting person in connection with her resignation from the Board of Directors.</footnote>
        <footnote id="F4">These shares were granted to the reporting person under the 2012 Share Incentive Plan as part of her employment agreement.  These shares will vest annually in equal installments over a period of five years beginning on the first anniversary of the grant date.</footnote>
        <footnote id="F5">These shares were granted to the reporting person under the 2012 Share Incentive Plan for satisfactory participation on the Board of Directors prior to her resignation.  These shares will vest in full on 2/5/2014.</footnote>
        <footnote id="F6">Represents shares issued upon the settlement of performance shares previously granted to the reporting person under the 2012 Share Incentive Plan for the fiscal 2013 performance period, which shares are fully vested.</footnote>
        <footnote id="F7">Represents the weighted average of multiple sales transactions ranging in price from $32.00 to $32.24.  The reporting person agrees to provide upon request by the SEC Staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range.</footnote>
        <footnote id="F8">These retention stock options, which were issued to the reporting person under the 2012 Share Incentive Plan will vest annually in equal installments over a period of three years, beginning on the first anniversary of the grant date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Jeannette M. Mills</signatureName>
        <signatureDate>2014-06-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
