    <SEC-DOCUMENT>0001104659-21-059193-index.html : 20210430
    <SEC-HEADER>0001104659-21-059193.hdr.sgml : 20210430
    <ACCEPTANCE-DATETIME>20210430171119
    ACCESSION NUMBER:		0001104659-21-059193
    CONFORMED SUBMISSION TYPE:	S-4/A
    PUBLIC DOCUMENT COUNT:		21
    FILED AS OF DATE:		20210430
    DATE AS OF CHANGE:		20210430

    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/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-252829
    		FILM NUMBER:		21879595

    	BUSINESS ADDRESS:
    		STREET 1:		ONE WORLD TRADE CENTER, FLOOR 65
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10007
    		BUSINESS PHONE:		646 429 1800

    	MAIL ADDRESS:
    		STREET 1:		ONE WORLD TRADE CENTER, FLOOR 65
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10007

    	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

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			New MDC LLC
    		CENTRAL INDEX KEY:			0001841050
    		IRS NUMBER:				861390679
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		S-4/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-252829-01
    		FILM NUMBER:		21879596

    	BUSINESS ADDRESS:
    		STREET 1:		ONE WORLD TRADE CENTER
    		STREET 2:		FLOOR 65
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10007
    		BUSINESS PHONE:		6464291837

    	MAIL ADDRESS:
    		STREET 1:		ONE WORLD TRADE CENTER
    		STREET 2:		FLOOR 65
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10007
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>S-4/A
    <SEQUENCE>1
    <FILENAME>tm214718-12_s4a.htm
    <DESCRIPTION>AMENDMENT NO. 3 TO FORM S-4 REGISTRATION STATEMENT
    <TEXT>
    Document 1 - file: tm214718-12_s4a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-8.1
    <SEQUENCE>2
    <FILENAME>tm214718d13_ex8-1.htm
    <DESCRIPTION>EXHIBIT 8.1
    <TEXT>
    Document 2 - file: tm214718d13_ex8-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-8.2
    <SEQUENCE>3
    <FILENAME>tm214718d13_ex8-2.htm
    <DESCRIPTION>EXHIBIT 8.2
    <TEXT>
    Document 3 - file: tm214718d13_ex8-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.1
    <SEQUENCE>4
    <FILENAME>tm214718d13_ex23-1.htm
    <DESCRIPTION>EXHIBIT 23.1
    <TEXT>
    Document 4 - file: tm214718d13_ex23-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.2
    <SEQUENCE>5
    <FILENAME>tm214718d13_ex23-2.htm
    <DESCRIPTION>EXHIBIT 23.2
    <TEXT>
    Document 5 - file: tm214718d13_ex23-2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.3
    <SEQUENCE>6
    <FILENAME>tm214718d13_ex23-3.htm
    <DESCRIPTION>EXHIBIT 23.3
    <TEXT>
    Document 6 - file: tm214718d13_ex23-3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.5
    <SEQUENCE>7
    <FILENAME>tm214718d13_ex99-5.htm
    <DESCRIPTION>EXHIBIT 99.5
    <TEXT>
    Document 7 - file: tm214718d13_ex99-5.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.7
    <SEQUENCE>8
    <FILENAME>tm214718d13_ex99-7.htm
    <DESCRIPTION>EXHIBIT 99.7
    <TEXT>
    Document 8 - file: tm214718d13_ex99-7.htm

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

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>lg_mdcp-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: lg_mdcp-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>lg_pwc-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: lg_pwc-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>sg_pricewaterhousellp-bw.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: sg_pricewaterhousellp-bw.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>tm214718d1-fc_mdc4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: tm214718d1-fc_mdc4clr.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>tm214718d1-ftr_address4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: tm214718d1-ftr_address4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>tm214718d13_ex23-2img001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: tm214718d13_ex23-2img001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>tm214718d13_ex8-1img001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: tm214718d13_ex8-1img001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>tm214718d13_ex8-1img002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: tm214718d13_ex8-1img002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>tm214718d13_ex8-1img003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: tm214718d13_ex8-1img003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>tm214718d13_ex8-2img001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: tm214718d13_ex8-2img001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>tm214718d3-fc_combine4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: tm214718d3-fc_combine4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>tm214718d3-hr_rockfell4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: tm214718d3-hr_rockfell4c.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>