- Medical Professional Liability Association
- Medical Records Reference Service LP
- Medical Society of Sedgwick County
- Medical Society of the State of New York
- Medical Specialists
- Medical Transcription Industry Alliance
- Medical University of South Carolina
- Medical West
- Medicine On Time
- Medifacts International
- Medifacts International
- Medilodge of Howell
- Medina County Board
- Medina Memorial Hospital
- Mediprime Group Ltd.
- MeDRA MSSO
- Medrad, Inc.
- Medsource
- MedStar Georgetown University Hospital
- MedStar Montgomery Medical Center
- MedStar Southern Maryland Hospital Center
- MedStar Washington Hospital Center
- MedTrials, Inc.
- Medtronic
- Medtronic
- Meeting and Conference Solutions Inc
- Meeting Expectations
- Meeting Management Services, Inc.
- Meeting Matrix International, Inc.
- Meetings and Conventions Magazine
- Meetup
- MEGA II, LTD
- Meggitt
- Meier and Frank
- Melbourne Regional Medical Center
- Melissa Elmore State Farm
- Mellon Financial
- MelroseWakefield Hospital
- Memberclicks
- Members Group
- Memorial Care Orange Coast Medical Center
- Memorial Health Meadows Hospital
- Memorial Health System
- Memorial Health University Medical Center
- Memorial Healthcare Owosso
- Memorial Hermann Greater Heights Hospital
- Memorial Hermann Health System
- Memorial Hermann The Woodlands Hospital
- Memorial Hermann-Texas Medical Center
- Memorial Hospital