M
- Marquette Electronics
- Martel Instruments
- Masimo Corp
- Mastercare Patient Equipment Inc
- McKesson Automation Inc
- Medasonics Inc
- Medcare Products
- Medela
- Medex Medfusion
- Medi-Man Rehab Products
- Mediana Usa Inc
- Medical Data Electronics
- Medical Devices Inc
- Medical Lab Automation
- Medical Positioning Inc
- Medical Research Laboratories
- Medical System International Corp
- Medical Technology Products
- Mediwatch USA
- Medline Industries Inc
- Medrad Inc
- Medtronic Inc
- Medweigh
- Mennen Medical Inc
- Mentor Corp
- Mesa Medical
- Metro Industries
- Meyer Equipment Co Inc
- Micro Medical LTD
- Micronix Systems Inc
- MicroPace EP Inc
- Midmark Corp
- Mindray North America
- Minimed Inc
- MinRad International Inc
- Mizuho OSI
- Mobilizer Medical Products
- Monaghan Medical Corp
- Mortara Instruments