- AstraZeneca
- Acadia
- Aventis
- Banyan
- D-Pharm
- Eisai
- Elan
- Eli Lilly and Company
- Fujisawa
- GlaxoSmithKline
- Hamilton Pharmaceuticals
- Janssen
- Johnson & Johnson
- Merck
- Minster Research
- Mitsubishi Tanabe Pharma Corporation
- Myriad
Pharmaceutical Affiliates
- Neurobiological Technologies
- Novartis
- Novo Nordisk
- Omnicare Clinical Research
- Ono Pharmaceuticals
- Ortho-McNeil-Janssen Pharmaceuticals
- Pfizer
- PharmaNet
- PhotoThera
- R. W. Johnson
- Takeda Pharmaceuticals
- Texas Biotech
- Saegis Pharmaceuticals
- Sanofi Aventis
- Schwarz Bioscience
- Wyeth
- Yamanouchi