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Press Release

MDC Partners Announces Details of Investor Day

New York , New York , March 16, 2006 – MDC Partners Inc. (“MDC Partners” or the “Company”) will host an investor day on Wednesday, April 5, 2006 beginning at 8:30 A.M.

If you plan to attend this event in person, you must register in advance by sending your contact information and number of attendees to investorrelations@mdc-partners.com by Wednesday, March 29, 2006.

A live webcast of the meeting will also be available on April 5, 2006. Individuals interested in participating via webcast can register at www.mdc-partners.com. The registration period for the webcast will begin approximately two weeks prior to the event. A recording of the event will also be available on the Company’s website.

About MDC Partners Inc.

MDC Partners is a leading provider of marketing communications services and secure transaction products and services to clients in the North America, Europe, Australia and Latin America. Through its partnership of entrepreneurial firms, its Marketing Communications Group provides advertising, specialized communications and consulting services to clients. The Secure Products Group provides security products and services in three primary areas including electronic transaction products, secure ticketing products and stamps. MDC Partners Class A shares are publicly traded on the NASDAQ under the symbol “MDCA” and on the Toronto Stock Exchange under the symbol “MDZ.SV.A”.

This press release contains forward-looking statements within the meaning of section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Such forward-looking statements involve risks and uncertainties which may cause the actual results or objectives to be materially different from those expressed or implied by such forward-looking statements. Such factors include, among other things, the Company’s financial performance; changes in the competitive environment; adverse changes in the economy; ability to maintain long-term relationships with customers; financing requirements; risks arising from material weaknesses in internal control over financial reporting; and other Risk Factors set forth in the Company’s Form 10-K for its fiscal year ended December 31, 2005 and subsequent SEC filings.