| Company Name | City | State | Country/Region | Website | Service Type |
|---|---|---|---|---|---|
| Acambis | Cambridge | Massachusetts | United States | Core Subsidiary | |
| Accelerated Biosciences Corp. | Carlsbad | California | United States | acceleratedbio.com | Core Company |
| Acceleron Pharma, Inc | Cambridge | Massachusetts | United States | acceleronpharma.com | Core Company |
| Acer Therapeutics Inc. | Concord | Massachusetts | United States | acertx.com | Core Company |
| Acetylon Pharmaceuticals, Inc. | Boston | Massachusetts | United States | acetylon.com | Core Subsidiary |
| Achillion Pharmaceuticals, Inc. | New Haven | Connecticut | United States | achillion.com | Core Company |
| ACON Pharmaceuticals, Inc | Cranbury | New Jersey | United States | aconpharma.com | Core Company |
| Acousia Therapeutics GmbH | Tübingen | Germany | acousia.com | Core Company | |
| Acta Pharmaceuticals | Boston | Massachusetts | United States | Core Company | |
| Actelion Pharmaceuticals Ltd. | South San Francisco | California | United States | actelionus.com | Core Subsidiary |
| Actinium Pharmaceuticals, Inc. | New York | New York | United States | actiniumpharma.com | Core Company |
| Activation Capital | Richmond | Virginia | United States | activation.capital | Investor/Venture Capital |
| Actyon Discovery, Inc. | Poway | California | United States | actyondiscovery.com | Core Company |
| Acumen Pharmaceuticals, Inc | Newton | Massachusetts | United States | acumenpharm.com | Core Company |
| AcureX Biosciences | San Carlos | California | United States | acurex.com | Core Company |
| Acurx Pharmaceuticals, Inc. | Staten Island | New York | United States | acurxpharma.com | Core Company |
| Adanate, Inc. | Alameda | California | United States | adanate.com | Core Company |
| Adaptin Bio, Inc. | Charlotte | North Carolina | United States | adaptinbio.com/ | Core Company |
| AdAstra Bio | Shawnee | Kansas | United States | biokansas.org | State Affiliate |
| Adial Pharmaceuticals Inc | Charlottesville | Virginia | United States | adialpharma.com | Core Company |
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