| Company Name | City | State | Country/Region | Website | Service Type |
|---|---|---|---|---|---|
| Omeros Corporation | Seattle | Washington | United States | omeros.com | Core Company |
| OmniPulse BioSciences | Cambridge | Massachusetts | United States | omnipulsebio.com | Core Company |
| Oncoceutics, Inc. | Philadelphia | Pennsylvania | United States | oncoceutics.com | Core Company |
| OncoImmune, Inc. | Rockville | Maryland | United States | oncoimmune.com | Core Company |
| ONL Therapeutics, Inc. | Ann Arbor | Michigan | United States | onltherapeutics.com | Core Company |
| Oorja Bio | Houston | Texas | United States | oorjabio.com | Core Company |
| Orchard Therapeutics NA | Boston | Massachusetts | United States | orchard-tx.com | Core Company |
| Oregon Life Sciences | Portland | Oregon | United States | oregonlifesciences.org | State Affiliate |
| Organon & Co. | Jersey City | New Jersey | United States | organon.com | Core Company |
| Organon & Co. - Contract Manufacturing | Ciudad de México | Federal District | Mexico | Core Subsidiary | |
| OriCiro Genomics | Tokyo | Japan | www.oriciro.com | Core Company | |
| Origenis Gmbh | Planegg | Germany | origenis.com | Core Company | |
| Origin Biosciences, Inc. | Palo Alto | California | United States | https://www.origintx.com/ | General Company |
| Orna Therapeutics, Inc. | Cambridge | Massachusetts | United States | ornatx.com | Core Company |
| Orpheris, Inc. | Redwood City | California | United States | orpheris.com | Core Subsidiary |
| Oryn Therapeutics | Los Angeles | California | United States | oryntherapeutics.com | Core Company |
| OS Therapies | New York | New York | United States | ostherapies.com | Core Company |
| Outer Biosciences LLC | Malden | Massachusetts | United States | outerbio.com | Core Company |
| Outlook Therapeutics, Inc. | Iselin | New Jersey | United States | outlooktherapeutics.com | Core Company |
| Ovid Therapeutics Inc. | New York | New York | United States | ovidrx.com | Core Company |
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