- MBF Healthcare Partners
- McBee
- McBee Associates
- McDermott Will & Emery LLP
- McGregor Senior Living Communities
- McGuireWoods
- McKesson Corp.
- McKinley Advisors
- McKinsey & Company
- McLaren Health
- MD Home Assist
- MD Home Health
- MDLive
- Med-QUEST
- Medalogix
- Medalogix Muse
- MedArrive
- Medical College of Wisconsin
- Medical Services America
- Medical Services of America