<SEC-DOCUMENT>0001144204-19-015997.txt : 20190326
<SEC-HEADER>0001144204-19-015997.hdr.sgml : 20190326
<ACCEPTANCE-DATETIME>20190326160029
ACCESSION NUMBER:		0001144204-19-015997
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190314
FILED AS OF DATE:		20190326
DATE AS OF CHANGE:		20190326

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Stagwell Agency Holdings LLC
		CENTRAL INDEX KEY:			0001771728
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13718
		FILM NUMBER:		19705314

	BUSINESS ADDRESS:	
		STREET 1:		1808 I STREENET, NW
		STREET 2:		6TH FLOOR
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20006
		BUSINESS PHONE:		9177652638

	MAIL ADDRESS:	
		STREET 1:		1808 I STREENET, NW
		STREET 2:		6TH FLOOR
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20006

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Stagwell Group LLC
		CENTRAL INDEX KEY:			0001771444
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13718
		FILM NUMBER:		19705315

	BUSINESS ADDRESS:	
		STREET 1:		1808 I STREENET, NW
		STREET 2:		6TH FLOOR
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20006
		BUSINESS PHONE:		9177652638

	MAIL ADDRESS:	
		STREET 1:		1808 I STREENET, NW
		STREET 2:		6TH FLOOR
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20006

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Penn Mark Jeffery
		CENTRAL INDEX KEY:			0001771735

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13718
		FILM NUMBER:		19705316

	MAIL ADDRESS:	
		STREET 1:		1808 I STREENET, NW
		STREET 2:		6TH FLOOR
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20006

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MDC PARTNERS INC
		CENTRAL INDEX KEY:			0000876883
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-ADVERTISING AGENCIES [7311]
		IRS NUMBER:				980364441
		STATE OF INCORPORATION:			A6
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		745 FIFTH AVENUE, 19TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10151
		BUSINESS PHONE:		646 429 1800

	MAIL ADDRESS:	
		STREET 1:		745 FIFTH AVENUE, 19TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10151

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MDC CORP INC
		DATE OF NAME CHANGE:	20001204

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MDC COMMUNICATIONS CORP
		DATE OF NAME CHANGE:	19961028

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MDC CORPORATION
		DATE OF NAME CHANGE:	19950419
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>tv517194_form3.xml
<DESCRIPTION>OWNERSHIP DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2019-03-14</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000876883</issuerCik>
        <issuerName>MDC PARTNERS INC</issuerName>
        <issuerTradingSymbol>MDCA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001771728</rptOwnerCik>
            <rptOwnerName>Stagwell Agency Holdings LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE STAGWELL GROUP LLC</rptOwnerStreet1>
            <rptOwnerStreet2>1808 EYE STREET, NW, SIXTH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20006</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001771444</rptOwnerCik>
            <rptOwnerName>Stagwell Group LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1808 EYE STREET, NW, SIXTH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20006</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001771735</rptOwnerCik>
            <rptOwnerName>Penn Mark Jeffery</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE STAGWELL GROUP LLC</rptOwnerStreet1>
            <rptOwnerStreet2>1808 EYE STREET, NW, SIXTH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20006</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Subordinate Voting Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14285714</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Series 6 convertible preference shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.00</value>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Subordinate Voting Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10000000</value>
                    <footnoteId id="F3"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">These securities are held directly by Stagwell Agency Holdings LLC (&quot;SAH&quot;). The Stagwell Group LLC is the manager of SAH. Mark J. Penn is the controlling person of The Stagwell Group LLC.</footnote>
        <footnote id="F2">Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise, the Reporting Persons are the beneficial owners of any securities reported herein.</footnote>
        <footnote id="F3">The number of Class A Subordinate Voting Shares (&quot;Class A Shares&quot;) of MDC Partners Inc. (the &quot;Issuer&quot;) deliverable upon conversion of each Series 6 convertible preference shares of the Issuer (the &quot;Preference Shares&quot;) is equal to the then-applicable liquidation preference divided by the then-applicable conversion price at such time. The initial liquidation preference of each Preference Share is $1,000. The initial conversion price is $5.00 per Preference Share, subject to customary anti-dilution adjustments. The liquidation preference of the Preference Shares accretes at 8.0% per annum, compounded quarterly until March 14, 2024. Holders of the Preference Shares are entitled to dividends in an amount equal to any dividends that would have been payable on the Class A Shares issuable upon conversion of the Preference Shares. Beginning two years after the Issue Date, the Issuer may redeem the Preferred Stock if certain conditions are met.</footnote>
    </footnotes>

    <remarks>Effective as of March 18, 2019, Mark J. Penn became the chief executive officer and a director of the Issuer.</remarks>

    <ownerSignature>
        <signatureName>STAGWELL AGENCY HOLDINGS LLC, By: The Stagwell Group LLC, its manager, /s/ Mark J. Penn, Manager</signatureName>
        <signatureDate>2019-03-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>THE STAGWELL GROUP LLC, /s/ Mark J. Penn, Manager</signatureName>
        <signatureDate>2019-03-26</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Mark J. Penn</signatureName>
        <signatureDate>2019-03-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
