1. Gilead Sciences Inc
2. Novartis AG
3. Pfizer Inc.
4. Merck & Co. Inc.
5. GlaxoSmithKline plc
6. F. Hoffmann-La Roche Ltd.
7. CTI BioPharma Corp.
8. Celltrion Healthcare Co. Ltd.
9. Bristol Myers Squibb Company
10. AbbVie Inc