Concentric's roster includes Pfizer, Novartis, Amgen, Allergan, and Genentech, and it was recently named agency of record for the rheumatology brand of Enbrel from Amgen and Pfizer.
MDC is mainly known as the holding company of consumer marketing shops such as Crispin Porter + Bogusky, and its model of acquiring agencies but leaving the senior management team with significant equity stakes to keep the tied to their businesses.