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| Company Name | Tel | Country/Region | Contact |
| Anilax Enterprises Incorporated | 800 788 8141 | United States | |
| ART-CHEM GmbH | +49 30 9489 2180 | Germany | |
| Anuh Pharma | 91-22-66227575 | India | |
| Anritsu Industrial Solutions（Shanghai）Co., Ltd. | 86-21-50463066 | Japan | |
| ANGELINI ACRAF SpA | 39-06-780531 | Italy | |
| Argosi International Co.,Ltd. | 86-574-87641500 | China | |
| Asia Talent Chemical Limited. | 86-755-86655561 | China | |
| Abbott Laboratories | +39 0464 422 097 | United States | |
| Advanced Quality Scitech USA, Inc. | 610 203 3216 | United States | |
| AK Scientific, Inc. | 510 429 8835 | United States | |
| Acme Bioscience, Inc. | 650 969-8000 | United States | |
| Adesis, Inc. | 302-323-6305 | United States | |
| AUSTRAL Biologicals | 925 543 0018 | United States | |
| A.G. Scientific, Inc. | 1 877 452 9925 | United States | |
| Alltech Associates, Inc., A GRACE Company | 847 948 8600 | United States | |
| American Diagnostica Inc. | 1 203 602-7777 | United States | |
| Asymchem Laboratories, Inc. | 919 468 3884 | United States | |
| ACC Corporation | 858 201 6118 | United States | |
| Acesys Pharmatech Corp | 1 908 998 1240 | United States | |
| Accellant, Inc. | 732 821 6161 | United States | |
| American Peptide Company, Inc. | 408 733-7604 | United States | |
| ASW MedChem, Inc. | 732 342 6911 | United States | |
| Advanced Asymmetrics, Inc. | 1 888 4CHIRAL (USA and Canada) | United States | |
| APAC Pharmaceutical, LLC | 410 997 5552 | United States | |
| Allweys LLC | 973 884 6052 | United States | |
| ACP Scientific | 609 873 8137 | United States | |
| Allichem LLC | 410-633-1363 | United States | |
| Atlantic SciTech Group, Inc. | 800 720 9483 | United States | |
| Anichem Inc. | 732 821 6500 | United States | |
| AcceleDev Chemical LLC | 973 439 1845 | United States |