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Startups and Funding insurers
- Global and national commercial carriers 15
- Regional carriers 20
- Personal-lines carriers that also insure businesses 9
- Specialty and E&S insurers 31
- Workers' comp specialists and state funds 7
- Medical and professional liability specialists 3
- Niche and affinity insurers 9
- Small business specialists 12
- Cyber specialists 3
- Program carriers and fronting insurers 6
- Reinsurer-owned commercial insurers 5
| # | Insurer | Type | Commercial premiums (2025) | AM Best |
|---|---|---|---|---|
| 53 | AccelerantA risk exchange whose insurers issue policies for 300-plus specialty MGAs insuring small and mid-sized businesses; a Thoma Bravo buyout is pending. | Program carriers and fronting insurers | $1.60 billion | A- (Excellent), under review with developing implications since August 2026 |
| — | At-BayCyber, tech E&O and MPL insurer for small and midsize firms, sold through brokers on its own E&S paper. Munich Re agreed to buy it in August 2026. | Cyber specialists | — | A- (Excellent), under review with positive implications (At-Bay Specialty Insurance Company) |
| — | CoalitionSan Francisco cyber MGA and carrier that pairs cyber, tech E&O and executive risks policies with security scanning and incident response, sold through brokers. | Cyber specialists | — | A- (Excellent) for Coalition Insurance Company |
| — | CowbellCyber MGA for small and midsize firms. Its Prime policies are issued by Palomar and Chaucer and sold only through agents and brokers. | Cyber specialists | — | — |
| — | Pie InsuranceVenture-backed insurtech that writes small business workers' comp on its own A- rated paper in 39 states and D.C., sold online and through 5,000-plus agencies. | Small business specialists | — | A- (Excellent) |
Ranked by 2025 U.S. commercial lines direct premiums written: NAIC 2025 market share data for 17 commercial lines (states and U.S. territories), summed by insurance group. A group's premium in a line where it is outside NAIC's top 125 is not counted. Seven groups are left out because a business cannot buy from them or their premium in these lines is mostly consumer coverage: USAA, CSAA, the Ohio Bureau of Workers' Compensation, Florida's Citizens, the Texas FAIR Plan and windstorm pool, Assurant and Generali. Brands without a rank are well-known companies inside these groups or outside the top 100.