1. Pfizer 2. Novartis 3. GlaxoSmithKline 4. Merck & Co 5. Bayer 6. Roche 7. AbbVie 8. Johnson & Johnson 9. Sanofi 10. Gilead Sciences 1. Pfizer: Pfizer Inc. is an American multinational pharmaceutical and biotechnology corporation headquartered on 42nd Street in Manhattan, New York City. The ...