1. Pfizer Inc.
2. Novartis Corporation
3. Hoffmann-La Roche Inc.
4. Sanofi-Aventis US LLC
5. Merck & Co. Inc.
6. Alector Inc.
7. GlaxoSmithKline LLC
8. Allergan USA Inc.
9. Eli Lilly and Company
10. Mylan Pharmaceuticals Inc.