- Omega Health Care Investors
- Omega Healthcare Investors
- Omega Senior Living
- omni agency
- Omni insurance
- Omnicare
- One Equity Partners
- One Medical
- One Mile at a Time
- OneCare Vermont
- onehome
- OnePoint Patient Care
- OnPointe
- OnPointe Health
- OnShift
- Optalis
- Optalis Healthcare
- Optima Healthcare Solutions
- OptimumBank
- Option Care Health