- MedicareMedigap Direct
- Medigap Market
- Medpacer
- MedSmart
- MedSmart Health & Life
- MedX
- MEGA Life and Health
- Mendota
- Mendota Metropolita
- Merastar
- Mercury
- Method Agency
- MetLife
- Metromile
- Metropolitan Insurance Co.
- MFMarketing
- Mid-Atlantic Health Group
- Mid-Continent Casualty
- Midland National Life
- Midwest Mutual
- Mike Moore
- Millbank
- Millenium Health
- Millenium Promotions
- Millers Mutual
- Milton Insurance Services
- Milwaukee
- Milwaukee General
- Milwaukee Guardian
- Milwaukee Mutual
- Minnehoma
- Minnesota Mutual
- Mission Loans, LLC
- Mississippi Insurance
- Missouri General
- MJ Direct
- MMI Group
- MMM Healthcare Inc.