| Company Name | Tel | Country/Region | Contact |
| Acorn PharmaTech LLC | 650 353 2487 | United States | |
| Aurum Pharmatech LLC | 888 614 9970 | United States | |
| Aquila Pharmatech LLC | 419 386 2527 | United States | |
| Aaron Chemistry GmbH | +49 (0) 8823-917521 | Germany | |
| Anhui BBCA International Co., Ltd. | 86-552-4089290 | China | |
| Agno Pharma | 1-212-5744825 | United States | |
| Aasenbo Pharmaceutical Co., Ltd, Beijing | 86-10-59433399 | China | |
| Adobe Chem Co., Ltd. | 86-512-63010178 | China | |
| Avistron Chemistry Services Ltd. | +44 5603 152978 | United Kingdom | |
| Abblis Chemicals LLC | toll free 877 799-4928 (US and Canada only) | United States | |
| Advanced Chemical Synthesis | 7 499 793 50 88 | Russian | |
| AOKBIO Co., Ltd. | 86 21 50115970 | China | |
| Alltech-Applied Science Labs (HK) Ltd. | 25911001 | Hong Kong | |
| Advanced Technology and Industrial Co. Ltd. | +852-2390-2293 | Hong Kong | |
| Alfa Aesar | (852) 2738 0380 | United Kingdom | |
| AHH Chemical Co., Ltd. | 86 29 87713646 | China | |
| Acros Organics | 1 973 889 6363 | Belgium | |
| Advanced Technology & Industrial Co., Ltd. | +852 2390 2293 | Hong Kong | |
| A. R. Medicom Inc. Healthcare (Shanghai) Limited | 86-21-52739363 | China | |
| Azelis | --55 79 97 | China | |
| Alchem International Ltd. | 91-11-26809882 | India | |
| Arshine Pharmaceutical Co., Ltd. | 86-731-88960822/88960803 | China | |
| Aetheron Scientific, Inc. | 1-760-308-6244 | United States | |
| Alpha Hawk Chemicals Industries Limited | 86-25-84513908 | China | |
| Anhui(Shanghai）Eastmark International Trading Co.,Ltd. | 86-551-63531806/63531805 | China | |
| AJU PHARM CO.,LTD. | 82-2-2630-0746 | Korea | |
| APC (SHANGHAI) TRADING CO., LTD. | 86-21-54656278 | China | |
| Avic （tieling）pharmaceutical co.，ltd | 86-24-72600168 | China | |
| Anhui Redstar Pharmaceutical Corp., Ltd | 86-563-5120338 | China | |
| AOBChem USA | (323) 382-7678 | United States |