Serono S.A., formerly Ares-Serono AG, is a biotechnology company headquartered in Geneva, Switzerland. The company develops and markets pharmaceuticals in the fields of Reproductive Health , Multiple Sclerosis and Growth & Metabolism. It is world-leader in the infertility market with an estimated market share of 60%, making it the third largest biotechnology company in the world. Serono's most important product accounted for 31.6% of the company's sales in 2004. Currently the company has a partnership in product development with Genentech Inc., a US biotechnology company.

Board of Directors

CEO and Vice Chairman of the Board is Ernesto Bertarelli.