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Eli Lilly and Company (NYSE: LLY) is a global pharmaceutical company. Eli Lilly's global headquarters is located in Indianapolis, Indiana, in the United States. The company was founded in 1876 by a pharmaceutical chemist, Eli Lilly, after whom the company was ultimately named.

Bristol-Myers Squibb (NYSE: BMY), often referred to as BMS, is a pharmaceutical company, headquarted in New York City.

Wyeth, formerly known as American Home Products (AHP), was one of the largest pharmaceutical companies in the world. The company is based in Madison, New Jersey, USA.

Merck & Co., Inc. (NYSE: MRK), also known as Merck Sharp & Dohme or MSD outside the USA and Canada, is one of the largest pharmaceutical companies in the world.

Abbott Laboratories (NYSE: ABT) is a diversified pharmaceuticals health care company. It has 72,000 employees and operates in over 130 countries.The corporate headquarters are in Abbott Park, Illinois, located near North Chicago, Illinois.

AstraZeneca plc (LSE: AZN, NYSE: AZN, OMX: AZN) is a British-Swedish pharmaceutical company formed on 6 April 1999 by the remerger of Swedish Astra AB and British Zeneca Group plc. Zeneca had been part of Imperial Chemical Industries (ICI), as three divisions that were spun off from ICI on 1 June 1993. It is a public company and is listed on the London Stock Exchange, the New York Stock Exchange and the OMX exchange. It is a constituent of the FTSE 100 Index.

Novartis International AG is a multinational pharmaceutical company based in Basel, Switzerland, ranking number one in revenues, which accounted over $53 billion in 2008, and number three in sales, which accounted 36.173 billon in 2008. Novartis is one of the largest healthcare companies in the world and a leading giant among pharmaceutical companies.

Sanofi-Aventis (Euronext: SAN, NYSE: SNY), headquartered in Paris, France, is a multinational pharmaceutical company, the world's fourth-largest by prescription sales. Sanofi-Aventis engages in the research and development, manufacturing and marketing of pharmaceutical products for sale principally in the prescription market.

F. Hoffmann–La Roche Ltd. is a Swiss global health-care company that operates worldwide under two divisions: Pharmaceuticals and Diagnostics. Its holding company, Roche Holding AG, has shares listed on the SIX Swiss Exchange.

GlaxoSmithKline plc (LSE: GSK NYSE: GSK) is a British pharmaceutical, biological, and healthcare company. GSK is the world's second largest pharmaceutical company and a research-based company with a wide portfolio of pharmaceutical products covering anti-infectives, central nervous system, respiratory, gastro-intestinal/metabolic, oncology, and vaccines products.