- MercyOne North Iowa
- MercyOne Oelwein
- MercyOne Primghar Medical Center
- MercyOne Sioux City
- MercyOne Waterloo Medical Center
- Meredith Corp.
- Meridia Audience Response
- Meridian Health Systems Data Center
- Meridian One Corporation
- Merill Lynch
- Meristar Hotels and Resorts, Inc.
- Merit Construction Company
- Merit Health Biloxi
- Merit Health Central Mississippi
- Merit Health River Region
- Merit Health Wesley
- Merit Hospital
- Merit Medical
- MeritCare Health Systems
- Meritor, Inc.
- Meritus Health
- Meriweather County, Department of Family and Children Services
- Mery Medical Center
- Mesa Arizona Convention and Visitors Bureau
- Mesa County Workforce Center
- Mesa County, Department of Human Services
- Mesa Public Schools
- Mesa United Way
- Mesa View Regional Hospital
- Mesilla Valley Hospice
- Mess. Service, Inc.
- Messiah Village
- Messier Services
- MET - West
- Met-Pro Corp.
- Metabolism Associates
- Metairie Manor
- Methodist Ambulatory Surgery Hospital - Medical Center
- Methodist Children's Hospital
- Methodist College
- Methodist Healthcare
- Methodist Heart Hospital
- Methodist Hospital
- Methodist Hospital
- Methodist Hospital
- Methodist Hospital Northeast
- Methodist Hospital of Southern California
- Methodist Hospital Olive Branch
- Methodist Hospital South
- Methodist Hospitals Norhtlake Campus