| Company Name | Tel | Country/Region | Contact |
| Allbio pharm Co., Ltd | China | ||
| Anhui Rencheng Technology Co., Ltd. | China | ||
| Advanced Biopharma Inc., Marketed as Muse Chem | United States | ||
| Anhui Ruisheng Machinery Co., Ltd. | +865508092927 | China | |
| Ark Pharm, Inc. | 847 367 3680 | United States | |
| Axispharm. | 858-677-9432 | United States | |
| Aktin Laboratories | 86-28-85159085 | China | |
| Anhui Rencheng Technology Co., Ltd | China | ||
| Advanced ChemBlocks Inc. | 650 692 2368 | United States | |
| A&J Pharmtech CO., LTD. | +86 512 62560819 | China | |
| Abby PharmaTech, LLC | 302 722-4030 | United States | |
| AAT Pharmaceutical, LLC | 800 818 4186 | United States | |
| Acentex Scientific, Inc. | (888) 308-0862 | United States | |
| A.A. Scientific Inc. | (979) 696-8080 | United States | |
| Alpha Biopharmaceuticals, Inc. | 650 652-3427 | United States | |
| Accela ChemBio Inc. | 858 699 3322 | United States | |
| Aldlab Chemicals, LLC | (781) 305-3213 | United States | |
| A&C Pharmtech, Inc. | 215 788-6600 | United States | |
| Aroma Circle Corp. | (858) 633-6298 | United States | |
| Aberjona Laboratories, Inc. | 978 338 4998 | United States | |
| ACONPHARM CORPORATION | 410 7308160 | United States | |
| ACS Scientific Inc. | 908 723-4992 | United States | |
| AP Bioscience | 609 755 2032 | United States |