- M&A Healthcare Advisors
- MAC Legacy
- Main Line Health
- Maine Center for Palliative Medicine
- MaineHealth
- MaineHealthCare at Home
- Make a Wish America
- Manatt Health
- Manatt Phelps & Phillips
- Manatt Phelps & Phillips LLP
- Manatt Phelps and Phillips
- Mannatt Ventures
- Maranon Capital
- Maribel Health
- Market.us
- MarketResearchFuture
- Marquis Health Consulting Services
- Marshfield Clinic Health System
- Marshfield Medical Center-Park Falls Home Health And Hospice
- Martis Capital