MDC Partners Inc. (NASDAQ: MDCA, TSX: MDZ.A) is a holding company based in New York City, United States and Toronto, Canada. It was founded as Multi Discipline Communications Inc in 1980 by Miles Nadal who is also the CEO of MDC Partners. They are the 8th largest advertising holding company in the world. Unlike other holding companies, MDC positions itself as a "partner," taking majority stakes, generally 60-80%.