[2] MDC is structured as a partnership model, in which it initially acquires a majority stake in its partner agency, leaving a percentage of ownership with the founder.

It continued to expand into the United States, surpassing CAD$1 billion in revenue in 2000 through acquisitions and organic growth.

[12] On July 21, 2015, Miles Nadal announced his resignation as CEO in response to an investigation by the U.S. Securities and Exchange Commission regarding executive pay and accounting practices.

[13][14] MDC's presiding director of the board, Scott Kauffman, succeeded Miles Nadal as chairman and CEO.

[18] In April 2018, MDC acquired a 51% majority stake in digital creative agency Instrument for an undisclosed amount.

[19] In March 2019, Mark Penn was named CEO of MDC Partners, and The Stagwell Group invested $100 million in the company.