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The Reinsurers 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 |
|---|---|---|---|---|
| 31 | Munich ReThe German reinsurer's U.S. arm: Munich Re Specialty's E&S, public entity, surety and program business, plus HSB equipment breakdown and NEXT. | Reinsurer-owned commercial insurers | $3.94 billion | A+ (Superior) |
| 36 | EverestBermuda-based reinsurer (NYSE: EG) that sold its retail commercial book to AIG in 2025; U.S. business now comes via E&S, program and specialty units. | Reinsurer-owned commercial insurers | $2.77 billion | A+ (Superior) |
| 49 | Swiss Re Corporate SolutionsSwiss Re's commercial insurance arm: high-capacity property, casualty, professional, surety, stop loss and captive fronting for large U.S. companies. | Reinsurer-owned commercial insurers | $1.89 billion | A+ (Superior) |
| 73 | HDI GlobalU.S. arm of Germany's Talanx/HDI: broker-placed property, casualty and specialty for mid-size and large companies, rated A+ by AM Best. | Reinsurer-owned commercial insurers | $1.07 billion | A+ (Superior) |
| 87 | Vantage RiskBermuda specialty (re)insurer founded in 2020 that writes U.S. excess casualty, construction, healthcare and large property; owned by Howard Hughes since 2026. | Specialty and E&S insurers | $822.5 million | A- (Excellent), positive outlook |
| 91 | SiriusPointBermuda specialty insurer and reinsurer whose U.S. business is written mostly through MGAs and program administrators on its admitted and E&S paper. | Specialty and E&S insurers | $719.5 million | A (Excellent), stable outlook |
| 92 | SCORFrench reinsurer whose U.S. primary arm writes large corporate risks through brokers and program and E&S business through MGAs, on GSNIC and GSINDA paper. | Reinsurer-owned commercial insurers | $711.6 million | A (Excellent), stable outlook |
| — | Lloyd'sLondon insurance market of about 100 syndicates, rated A+ by AM Best. U.S. firms reach it as surplus lines cover through brokers, wholesalers and coverholders. | Specialty and E&S insurers | — | A+ (Superior) |
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.