- Commerce Insurance Company
- Quincy Mutual Fire Insurance Company
- Patrons Mutual
- Citation Insurance Company
- Massachusetts Property Insurance Underwriting Association
- CNA Surety Company
- Mass Mutual Life Insurance
- Transamerican Life Insurance Company
- Travelers Life & Annuity
- MetLife (Metropolitan Life Insurance Company)
- The Hartford Insurance Company
- RLI Insurance Company
- Norfolk & Dedham Mutual Fire Insurance Co.
- Westport Insurance Corporation
- Hospitality Mutual Insurance Company
- National Flood Services
- Arch Insurance Company
- Blue Cross Blue Shield
- Fallon Health Plan
- United Healthcare
- Harvard Pilgrim Health Care
- Travelers