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
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
PUSTIL STEPHEN
  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 _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O MDC PARTNERS INC., 45 HAZELTON AVENUE
3. Date of Earliest Transaction (Month/Day/Year)
05/02/2007
(Street)

TORONTO, A6 M5R
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)               74,167 D  
FPB RSU's (Class A Shares) (2)               5,000 D  
Restricted Stock Units (Class A Shares) (3) 05/02/2007   A   4,000 A $ 0 4,000 D  
Class A Shares 05/11/2007   M   4,000 A $ 8.5 (4) 78,167 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

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 (5) $ 9.71 (4)             07/30/2004 07/29/2007 Class A Shares 5,000   5,000 D  
Stock Options (6) $ 8.5 (4) 05/10/2007   M     4,000 05/14/2002 05/14/2007 Class A Shares 4,000 $ 0 0 D  
Stock Options (7) $ 10.66 (4)             06/11/2003 06/11/2008 Class A Shares 25,000   25,000 D  
Stock Options (7) $ 10.66 (4)             06/11/2003 06/11/2008 Class A Shares 4,000   4,000 D  
Stock Options (8) $ 56.43 (4)             02/22/2000 03/22/2010 Class A Shares 1,905   1,905 D  
Stock Options (9) $ 9.19 (4)             04/29/2002 04/28/2012 Class A Shares 1,905   1,905 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
PUSTIL STEPHEN
C/O MDC PARTNERS INC.
45 HAZELTON AVENUE
TORONTO, A6 M5R
  X      

Signatures

 /s/ Stephen M. Pustil   05/14/2007
**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) Hereinafter, "Class A Shares".
(2) 5,000 of the Financial Performance-Based Restricted Stock Units (Class A Shares) (hereinafter, "FPB RSU's") of the Issuer, previously granted on February 28, 2006, vested in March 2007. A portion of the remaining FPB RSU's, may vest in each of 2008 and / or 2009 if the Issuer achieves specified financial performance targets in 2007 - 2008, and is dependent on the Reporting Person's continued service as a director of the Issuer. 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.
(3) These Restricted Stock Units will vest on the third anniversary of the date of grant, subject to potential accelerated vesting in specified circumstances. Upon vesting, each restricted stock unit represents the right to receive one Class A Share of the Issuer.
(4) Canadian dollars.
(5) Stock Appreciation Rights of the Issuer vest 1/3 on each anniversary of the grant date, expire four (4) years from the grant date, and are settled in cash or stock, at the option of the Issuer.
(6) These Stock Options were previously reported as having a grant date of April 16, 2002, an exercise price of Cdn$7.60, and an expiration date of April 16, 2007. The amended grant date for these options is May 14, 2002; the amended exercise price is Cdn$8.50; and the amended expiration date is May 14, 2007. These Stock Options vest 1/3 on the grant date, 1/3 on the following two (2) anniversaries of the grant date, and expire five (5) years from the grant date.
(7) These Stock Options were previously reported as having a grant date of May 1, 2003, an exercise price of Cdn$7.25, and an expiration date of May 1, 2008. The amended grant date for these options is June 11, 2003; the amended exercise price is Cdn$10.66; and the amended expiration date is June 11, 2008. These Stock Options vest 1/3 on the grant date, 1/3 on the following two (2) anniversaries of the grant date, and expire five (5) years from the grant date.
(8) These Stock Options were granted on July 31, 2003 and were fully vested at grant, and expire ten (10) years from the grant date.
(9) These Stock Options were granted on July 31, 2003 with an initial vesting date of April 29, 2002. These Stock Options vest 1/3 on the initial vesting date and 1/3 on each of the next two (2) anniversaries of the initial vesting date, and expire ten (10) years from the initial vesting date.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.