<SEC-DOCUMENT>0001181431-12-034768.txt : 20120605
<SEC-HEADER>0001181431-12-034768.hdr.sgml : 20120605
<ACCEPTANCE-DATETIME>20120605170849
ACCESSION NUMBER:		0001181431-12-034768
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20120601
FILED AS OF DATE:		20120605
DATE AS OF CHANGE:		20120605

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Stanley Michael D
		CENTRAL INDEX KEY:			0001542492

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12111
		FILM NUMBER:		12889888

	MAIL ADDRESS:	
		STREET 1:		1301 CONCORD TERRACE
		CITY:			SUNRISE
		STATE:			FL
		ZIP:			33323

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MEDNAX, INC.
		CENTRAL INDEX KEY:			0000893949
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-HOSPITALS [8060]
		IRS NUMBER:				650271219
		STATE OF INCORPORATION:			FL
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1301 CONCORD TERRACE
		CITY:			SUNRISE
		STATE:			FL
		ZIP:			33323
		BUSINESS PHONE:		9543840175

	MAIL ADDRESS:	
		STREET 1:		1301 CONCORD TERRACE
		CITY:			SUNRISE
		STATE:			FL
		ZIP:			33323

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PEDIATRIX MEDICAL GROUP INC
		DATE OF NAME CHANGE:	19950801
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd347517.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0305</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2012-06-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000893949</issuerCik>
        <issuerName>MEDNAX, INC.</issuerName>
        <issuerTradingSymbol>MD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001542492</rptOwnerCik>
            <rptOwnerName>Stanley Michael D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1301 CONCORD TERRACE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SUNRISE</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33323</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President, Pediatrix Division</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2012-06-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>11873</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>32598</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2012-06-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>8649</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>59.8906</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>23949</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Restricted shares granted pursuant to the Issuer's Amended and Restated 2008 Incentive Compensation Plan in connection with annual equity award.  The vesting of the restricted shares is subject to performance based criteria but will not vest any earlier than in three equal installments on June 1, 2013, June 1, 2014 and June 1, 2015.</footnote>
        <footnote id="F2">Sales of shares were made pursuant to the Reporting Person's 10b5-1 trading plan.</footnote>
        <footnote id="F3">Sales of shares were executed in forty-one (41) separate transactions with prices ranging from $59.44 to $60.11 for a weighted average sales price of $59.8906.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Dominic J. Andreano, Attorney-in-fact</signatureName>
        <signatureDate>2012-06-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24.
<SEQUENCE>2
<FILENAME>rrd311816_352182.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
<HTML>
<HEAD>
<TITLE>
rrd311816_352182.html
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<PRE>
Exhibit 24

POWER OF ATTORNEY
For Executing Forms 3, 4, and 5

	Know all men by these presents, that the undersigned hereby appoints each of Dominic J. Andreano
and Vivian Lopez-Blanco, with full power of substitution, the true and lawful attorneys-in-fact to:

(1)	execute for and on behalf of the undersigned SEC Forms 3, 4, and 5 relating to the
undersigned's interest in the Company's securities, in accordance with Section 16(a) of the
Securities Exchange Act of 1934, as amended, and the rules thereunder;

(2)	do and perform any and all acts for and on behalf of the undersigned which may be
necessary or desirable to complete the execution of any such Form 3, 4, or 5 and the timely
filing of such form with the United States Securities and Exchange Commission and any
other appropriate authority; and

(3)	take any other action of any type whatsoever in connection with the foregoing which, in the
opinion of the attorney-in-fact, may be of benefit to, in the best interest of, or legally required
by, the undersigned, it being understood that the documents executed by the attorney-in-fact
on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and
shall contain such terms and conditions as the attorney-in-fact may approve in his discretion.

       The undersigned hereby grants to the above attorneys-in-fact full power and authority to do and
perform all and every act and thing whatsoever requisite, necessary and proper to be done in the exercise of
any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all
that such attorneys-in-fact, shall lawfully do or cause to be done by virtue of this Power of Attorney and the
rights and powers herein granted.  The undersigned acknowledges that the above attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming any of the undersigned's
responsibilities to comply with Sections 13(d) or 16 of the Securities Exchange Act of 1937.

	The authority of Dominic J. Andreano and Vivian Lopez-Blanco under this Power of Attorney shall
continue until the undersigned is no longer required to file Forms 3, 4, or 5 with regard to the undersigned's
ownership of or transactions in securities of the Company, unless earlier revoked in writing.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of
this 10th day of May, 2012.


										/s/ Michael D. Stanley, M.D.
										------------------------------------
										Michael D. Stanley, M.D.

</PRE>
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</DOCUMENT>
</SEC-DOCUMENT>
