Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
NADAL MILES
   2. Issuer Name and Ticker or Trading Symbol
MDC PARTNERS INC [MDCA] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director __X__ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chairman and CEO
(Last)
(First)
(Middle)
C/O MDC PARTNERS INC., 45 HAZELTON AVENUE		 3. Date of Earliest Transaction (Month/Day/Year)
05/12/2006
(Street)

TORONTO, A6 M5R 2E3		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Class A Subordinate Voting Shares               1,857,311 D  
Financial Performance-Based Restricted Stock Units (Class A) (1)               300,000 I See footnote 2. (2)
Class A Subordinate Voting Shares 05/12/2006   P   20,000 A $ 10.34 (3) 1,877,311 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Appreciation Rights (4) $ 5 (3)             01/22/2004 01/22/2007 Class A Subordinate Voting Shares 475,000   475,000 D  
Stock Appreciation Rights (5) $ 9.71 (3)             07/30/2004 07/30/2007 Class A Subordinate Voting Shares 338,200   338,200 D  
Stock Options (6) $ 5.4 (3)             10/09/2002 10/09/2007 Class A Subordinate Voting Shares 475,000   475,000 D  
Stock Options (6) $ 7.25 (3)             05/01/2003 05/01/2008 Class A Subordinate Voting Shares 382,000   382,000 D  
Stock Options (6) $ 9.5 (3)             06/02/2003 06/02/2008 Class A Subordinate Voting Shares 28,000   28,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
NADAL MILES
C/O MDC PARTNERS INC.
45 HAZELTON AVENUE
TORONTO, A6 M5R 2E3		   X   X   Chairman and CEO  

Signatures

 Miles Nadal   05/15/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) A portion of the Financial Performance-Based Restricted Stock Units (Class A Shares) of the Issuer may vest in each of 2007, 2008 and / or 2009 if the Issuer achieves specified financial performance targets in 2006 - 2008, and is dependent on continued employment. Such financial targets are set forth in a "Financial Performance-Based Restricted Stock Unit Agreement", a form of which was filed by the Issuer as an exhibit to a Form 8-K filed with the SEC on March 2, 2006.
(2) Held by an Affiliate under a Management Services Agreement.
(3) Canadian dollars.
(4) Stock Appreciation Rights (previously granted in January 22, 2003) vest 1/3 on each anniversary of the grant date, expire four (4) years from the grant date, and may be settled in cash or in stock at the option of the Issuer.
(5) Stock Appreciation Rights (previously granted on July 30, 2003) vest 1/3 on each anniversary of the grant date, expire four (4) years from the grant date, and may be settled in cash or in stock at the option of the Issuer.
(6) Stock Options (previously granted on October 9, 2002, May 1, 2003 or June 2, 2003) vest 1/5 on the grant date and 1/5 on each anniversary of the grant date, expiring five (5) years from the grant date.

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