    <SEC-DOCUMENT>0001104659-20-100497-index.html : 20200831
    <SEC-HEADER>0001104659-20-100497.hdr.sgml : 20200831
    <ACCEPTANCE-DATETIME>20200831090426
    ACCESSION NUMBER:		0001104659-20-100497
    CONFORMED SUBMISSION TYPE:	S-4
    PUBLIC DOCUMENT COUNT:		12
    FILED AS OF DATE:		20200831
    DATE AS OF CHANGE:		20200831

    FILER:

    	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

    	FILING VALUES:
    		FORM TYPE:		S-4
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-248499
    		FILM NUMBER:		201149960

    	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>S-4
    <SEQUENCE>1
    <FILENAME>tm2023004-1_s4.htm
    <DESCRIPTION>S-4
    <TEXT>
    Document 1 - file: tm2023004-1_s4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-5.1
    <SEQUENCE>2
    <FILENAME>tm2023004d2_ex5-1.htm
    <DESCRIPTION>EXHIBIT 5.1
    <TEXT>
    Document 2 - file: tm2023004d2_ex5-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-8.1
    <SEQUENCE>3
    <FILENAME>tm2023004d2_ex8-1.htm
    <DESCRIPTION>EXHIBIT 8.1
    <TEXT>
    Document 3 - file: tm2023004d2_ex8-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-8.2
    <SEQUENCE>4
    <FILENAME>tm2023004d2_ex8-2.htm
    <DESCRIPTION>EXHIBIT 8.2
    <TEXT>
    Document 4 - file: tm2023004d2_ex8-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.1
    <SEQUENCE>5
    <FILENAME>tm2023004d2_ex23-1.htm
    <DESCRIPTION>EXHIBIT 23.1
    <TEXT>
    Document 5 - file: tm2023004d2_ex23-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>lg_kingsdaleadvis-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: lg_kingsdaleadvis-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>lg_mdcpart-4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: lg_mdcpart-4clr.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>tm2023004d1-proxycard1_4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: tm2023004d1-proxycard1_4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>tm2023004d1-proxycard2_bw.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: tm2023004d1-proxycard2_bw.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>tm2023004d1-proxycard3_4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: tm2023004d1-proxycard3_4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>tm2023004d2_ex5-1img001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: tm2023004d2_ex5-1img001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>tm2023004d2_ex5-1img002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: tm2023004d2_ex5-1img002.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>