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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1. Name and Address of Reporting Person * Swartzman Gavin   2. Issuer Name and Ticker or Trading Symbol MDC PARTNERS INC [MDCA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Managing Director (Last) (First) (Middle) C/O MDC PARTNERS INC., 45 HAZELTON AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 03/19/2007 (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               41,898 (1) D   Class A Subordinate Voting Shares 03/19/2007   F   8,041 D $ 7.73 33,857 (2) D   Financial Performance-Based Restricted Stock Class A Shares 03/20/2007   A   30,357 A $ 0 64,214 (3) D

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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 Options (4)

$ 8.02 (4) (5)

11/14/2002(4)

11/14/2007(4)

Class A Subordinate Voting Shares

21,000

21,000

D

Stock Appreciation Rights (6)

$ 13.61 (5)

08/24/2005

08/24/2008

Class A Subordinate Voting Shares

30,000

30,000

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Swartzman Gavin C/O MDC PARTNERS INC. 45 HAZELTON AVENUE TORONTO, A6 M5R 2E3			Managing Director

Signatures

/s/ Gavin Swartzman		03/23/2007
**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)	Includes 35,000 Financial Performance-Based Restricted Stock Units (Class A Shares) (hereinafter, "RSU's") of the Issuer awarded on February 28, 2006. 17,500 of these RSU's were deemed fully vested as unrestricted Class A Shares on March 15, 2007. The remaining RSU's may vest in 2008 and / or 2009 if the Issuer achieves specified financial performance targets in 2007 - 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)	At the time the 17,500 RSUs vested, the Reporting Person elected to have 8,041 of the fully vested Class A Shares withheld to satisfy Canadian income tax withholding, and the remaining 9,459 fully-vested, unrestricted Shares were issued.
(3)	A portion of the Financial Performance-Based Restricted Stock Units (Class A Shares) of the Issuer awarded March 20, 2007 may vest in each of 2008, 2009 or 2010 if the Issuer achieves specified financial performance targets in 2007, 2008 and 2009, and is dependent on continued employment
(4)	These Stock Options were previously reported as having an exercise price of $5.40 Canadian, a grant date and date exercisable of October 9, 2002, and an expiration date of October 9, 2007. These values have been corrected as shown following a voluntary internal review of historical Stock Options grant practices completed by the Issuer. The Stock Options vest 1/5 on grant and 1/5 on each anniversary of the grant date, expiring five years from the grant date.
(5)	Canadian dollars.
(6)	Stock Appreciation Rights (previously granted on August 24, 2004) vest 1/3 on each anniversary of the grant date, expire four years from the grant date, and may settled in cash or in stock at the discretion of the Issuer.

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