- Acadia
- Aetna
- AIG
- Altus Dental
- Andover Companies
- Arbella Insurance Group
- BCBS of MA
- Chubb
- Cigna
- CNA
- Delta Dental
- Fallon Health
- Foremost
- Guard
- Hanover
- Hartford
- Harvard Pilgrim
- John Hancock
- Lincoln Financial Group
- MAPFRE
- Mass Property
- MassMutual
- MetLife
- Mutual of Omaha
- Neighborhood Health
- Norfolk & Dedham
- OneBeacon
- Peerless
- Philadelphia
- Plymouth Rock Assurance
- Principal Financial Group
- Prudential
- PURE
- Safety
- SunLife
- Travelers
- Tufts Health Plan
- United Healthcare
- Unum
- Vermont Mutual Insurance Group