| Company Name | City | State | Country/Region | Website | Service Type |
|---|---|---|---|---|---|
| Assembly Biosciences | South San Francisco | California | United States | assemblybio.com | Core Company |
| Atea Pharmaceuticals | Boston | Massachusetts | United States | ateapharma.com | Core Company |
| Auckland UniServices Limited | 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 | Service Provider (SVCP) |
| Aurora Biosciences Corporation | San Diego | California | United States | vrtx.com | Core Subsidiary |
| Auspex Pharmaceuticals, Inc | La Jolla | California | United States | auspexpharma.com | Core Company |
| Autoimmunity BioSolutions | Houston | Texas | United States | abstherapeutics.com | Core Company |
| Auxilium Pharmaceuticals, Inc | Chesterbrook | Pennsylvania | United States | auxilium.com | Core Company |
| Avalyn Pharma Inc. | Boston | Massachusetts | United States | avalynpharma.com | Core Company |
| Avantor Performance Materials | Phillipsburg | New Jersey | United States | avantormaterials.com | Association |
| AviadoBio | London | United Kingdom | aviadobio.com | Core Company | |
| Avid Radiopharmaceuticals, Inc | Philadelphia | Pennsylvania | United States | avidrp.com | Core Subsidiary |
| Avidia, Inc | Mountain View | California | United States | avidia.com | Core Subsidiary |
| Avidity Biosciences | San Diego | California | United States | aviditybio.com | Core Company |
| Avirmax Inc. | Hayward | California | United States | avirmax.com | Core Company |
| Axelyra Therapeutics | Paramus | New Jersey | United States | Core Company | |
| Axsome Therapeutics | New York | New York | United States | axsome.com | Core Company |
| Azafaros | Basel | Switzerland | azafaros.com | Core Company | |
| Azitra, Inc. | Branford | Connecticut | United States | azitrainc.com | Core Company |
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