| Company Name | City | State | Country/Region | Website | Service Type |
|---|---|---|---|---|---|
| Astrazeneca India Pvt. Ltd | Bangalore | India | astrazenecaindia.com | Core Subsidiary | |
| Astrazeneca KK | Gaithersburg | Maryland | United States | astrazeneca.co.jp | Core Subsidiary |
| AstraZeneca, Research & Development, Inc | Waltham | Massachusetts | United States | astrazeneca.com | Core Subsidiary |
| Astria Therapeutics, Inc. | Cambridge | Massachusetts | United States | astriatx.com | Core Company |
| Atea Pharmaceuticals | Boston | Massachusetts | United States | ateapharma.com | Core Company |
| Atransen Pharma | Osaka | Japan | atransen.com | Core Company | |
| Auckland UniServices, Ltd | Auckland | New Zealand | uniservices.co.nz | Non-Profit | |
| Audition Therapeutics, Inc. | Palo Alto | California | United States | General Company | |
| Aulos Bioscience | Larkspur | California | United States | aulosbio.com | Core Company |
| Aureka Biotechnologies, Inc. | Laguna Hills | California | United States | aurekabio.com | Contract Research Organization |
| Aurion Biotech | Seattle | Washington | United States | aurionbiotech.com | Core Company |
| Aurora Biosciences Corporation | San Diego | California | United States | vrtx.com | Core Subsidiary |
| Auxilium Pharmaceuticals, Inc | Chesterbrook | Pennsylvania | United States | auxilium.com | Core Company |
| Avalo Therapeutics | Wayne | Pennsylvania | United States | www.avalotx.com | Core Company |
| Avalor Therapeutics, Inc. | Kenmore | Washington | United States | avalortx.com | Core Company |
| Avalyn Pharma Inc. | Boston | Massachusetts | United States | avalynpharma.com | Core Company |
| Avammune Therapeutics, Inc. | Levittown | Pennsylvania | United States | avammune.com | Core Company |
| Avantor | Radnor | Pennsylvania | United States | vwr.com | BBS Vendor |
| Avantor Performance Materials | Phillipsburg | New Jersey | United States | avantormaterials.com | Association |
| AviadoBio | London | United Kingdom | aviadobio.com | Core Company |
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