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Global and national commercial carriers
- 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 |
|---|---|---|---|---|
| 1 | TravelersThe largest U.S. business insurer by 2025 commercial premiums. A++ rated, sold through independent agents, No. 1 in package policies, surety and fidelity. | Global and national commercial carriers | $27.13 billion | A++ (Superior) |
| 2 | ChubbGlobal insurer and the No. 1 U.S. writer of business liability coverage. A++ rated, with Westchester for E&S and online quotes for small firms. | Global and national commercial carriers | $23.25 billion | A++ (Superior) |
| 3 | Liberty MutualBoston-based mutual and No. 3 U.S. business insurer. Leading surety writer, sells small business coverage through independent agents and E&S via Ironshore. | Global and national commercial carriers | $19.93 billion | A (Excellent) |
| 4 | Berkshire HathawayNo. 4 U.S. business insurer through a family of separately run units: BHSI, MedPro, GUARD, biBERK, USLI, RSUI and BHHC. Major units rated A++ by AM Best. | Global and national commercial carriers | $18.64 billion | A++ (Superior) |
| 5 | Zurich North AmericaU.S. arm of Swiss-based Zurich Insurance Group, a broker-driven insurer of mid-size and large companies, strong in workers' comp, surety and construction. | Global and national commercial carriers | $14.62 billion | A+ (Superior) |
| 6 | The HartfordConnecticut insurer founded in 1810, the No. 1 U.S. workers' comp writer and a top small business carrier, with Navigators and Maxum for specialty and E&S. | Global and national commercial carriers | $14.61 billion | A+ (Superior) |
| 7 | AIGGlobal commercial insurer for middle-market, large and multinational companies, led in the U.S. by National Union and Lexington, the E&S arm. Broker-sold. | Global and national commercial carriers | $14.45 billion | A (Excellent) |
| 8 | CNAChicago commercial insurer controlled by Loews, sold through agents and brokers. Strong in professional liability, healthcare, surety and specialty lines. | Global and national commercial carriers | $13.47 billion | A+ (Superior) |
| 11 | Tokio MarineJapan's Tokio Marine owns Philadelphia Insurance, Tokio Marine HCC and Safety National: niche package, specialty lines and excess workers' comp. | Global and national commercial carriers | $9.53 billion | A++ (Superior) |
| 14 | NationwideColumbus mutual writing small business, middle market, agribusiness, E&S and program business through independent agents; No. 2 in U.S. farmowners. | Global and national commercial carriers | $8.08 billion | A (Excellent) |
| 17 | Old RepublicChicago-based specialty group (NYSE: ORI) behind Great West trucking, Bitco construction, PMA comp and large-deductible programs; No. 4 in U.S. commercial auto. | Global and national commercial carriers | $7.57 billion | A+ (Superior) |
| 20 | AXA XLAXA's commercial and specialty division, built on XL Group (bought 2018); writes liability, excess, property and specialty lines for mid-size and large firms. | Global and national commercial carriers | $6.76 billion | A+ (Superior) |
| 21 | Allianz CommercialAllianz's commercial arm (formerly AGCS, absorbing Fireman's Fund); large corporate property, casualty, marine, aviation and specialty cover through brokers. | Global and national commercial carriers | $6.61 billion | A+ (Superior) |
| 26 | FMPolicyholder-owned property insurer (formerly FM Global) for large and midsize companies, known for engineering-led loss prevention and member credits. | Global and national commercial carriers | $5.19 billion | A+ (Superior) |
| 32 | MSIG USAU.S. commercial arm of Japan's MS&AD: property, casualty, marine and financial lines for mid-size and multinational firms, plus MS Transverse fronting. | Global and national commercial carriers | $3.42 billion | 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.