- M&T Realty Capital
- MACPAC
- MAEVA Group
- Mailman School of Public Health
- Maine Center for Economic Policy
- Maine Department of Health and Human Services
- Maine Health Care Association
- Maine Veterans’ Home
- Maine Veterans’ Home Scarborough
- Maine Veterans’ Homes
- MaineHealth
- Mainstreet
- Mainstreet Investments
- Maison DeVille Nursing Home
- Maison DeVille Nursing Home of Harvey
- Maison Orleans Healthcare Center
- Majestic Care
- Managed Care & Contract Consulting
- Managed Medicare
- Management and Network Services