| Company Name | City | State | Country/Region | Website | Service Type |
|---|---|---|---|---|---|
| Astero Erado Inc. | College Station | Texas | United States | asteroerado.com | Core Company |
| AstraZeneca | Wilmington | Delaware | United States | astrazeneca.com | Core Company |
| AstraZeneca Canada Inc | Mississauga | Ontario | Canada | astrazeneca.ca | Core Subsidiary |
| AstraZeneca China | Shanghai | China | en.astrazeneca.com.cn | Core Subsidiary | |
| Astrazeneca India Pvt. Ltd | Bangalore | India | astrazenecaindia.com | Core Subsidiary | |
| Astrazeneca KK | Gaithersburg | Maryland | United States | astrazeneca.co.jp | Core Subsidiary |
| ASTRAZENECA TURKEY | ISTANBUL | Turkey | General Company | ||
| AstraZeneca, Research & Development, Inc | Waltham | Massachusetts | United States | astrazeneca.com | Core Subsidiary |
| 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 | |
| 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 |
| 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 | https://www.avantorsciences.com/site/ | BBS Vendor |
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