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Regional 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 |
|---|---|---|---|---|
| 16 | Auto-Owners InsuranceLansing, Michigan mutual that sells only through independent agents in 26 states; a top-10 U.S. writer of commercial package, commercial auto and fire. | Regional carriers | $7.64 billion | A+ (Superior) |
| 22 | Cincinnati InsuranceOhio insurer sold only through independent agents in 46 states; known for three-year commercial packages, local field claims staff and its own E&S company. | Regional carriers | $6.32 billion | A+ (Superior) |
| 27 | Selective InsuranceNew Jersey super-regional selling commercial package, auto, comp and bonds through independent agents in 38 states, plus E&S nationwide via MUSIC. | Regional carriers | $4.82 billion | A+ (Superior) |
| 29 | The HanoverWorcester, Mass., agency carrier (est. 1852) writing small and midsize business packages, comp and auto, plus specialty lines, in 44 states and D.C. | Regional carriers | $4.21 billion | A (Excellent) |
| 30 | Erie InsurancePolicyholder-owned reciprocal in Erie, Pa., selling small business packages, auto and comp through local agents in 12 states and D.C.; No. 1 in J.D. Power 2026. | Regional carriers | $3.96 billion | A (Excellent) |
| 38 | AcuitySheboygan, Wisconsin mutual selling through independent agents in 30-plus states; a major trucking insurer, rated A+ by both AM Best and S&P. | Regional carriers | $2.57 billion | A+ (Superior) |
| 39 | WestfieldOhio regional founded in 1848, selling commercial, farm and surety coverage through independent agents, plus E&S and Lloyd's capacity via Westfield Specialty. | Regional carriers | $2.48 billion | A (Excellent) |
| 44 | EMC InsuranceDes Moines mutual founded in 1911, selling commercial property, auto, liability, workers' comp and surety bonds through independent agents in over 40 states. | Regional carriers | $2.17 billion | A (Excellent) |
| 51 | West Bend InsuranceWisconsin regional founded in 1894 that sells business insurance in 14 states and surety bonds nationwide through independent agents only. | Regional carriers | $1.75 billion | A (Excellent) |
| 52 | Utica NationalUpstate New York mutual founded in 1914, known for school, volunteer fire department and insurance agents' E&O programs, sold through independent agents. | Regional carriers | $1.64 billion | A (Excellent) |
| 61 | GNY (Greater New York Mutual)New York mutual founded in 1914 that writes package policies for apartment, co-op, office, restaurant and light industrial risks in 16 states and D.C. | Regional carriers | $1.36 billion | A+ (Superior) |
| 64 | FCCI Insurance GroupSarasota-based mutual founded in 1959 as a contractors' comp fund; writes commercial P&C in 20 states and D.C. and surety in 45, through independent agents. | Regional carriers | $1.27 billion | A (Excellent) |
| 67 | UFG InsuranceCedar Rapids, Iowa, commercial insurer founded in 1946, selling packages, auto, comp and surety through about 850 independent agencies; Nasdaq: UFCS. | Regional carriers | $1.18 billion | A- (Excellent) |
| 72 | Western NationalMinnesota mutual selling commercial package, auto, comp, niche programs and surety through independent agents in the Upper Midwest, Northwest and Alaska. | Regional carriers | $1.09 billion | A+ (Superior) |
| 74 | Encova InsuranceColumbus, Ohio mutual formed from Motorists and BrickStreet; workers' comp in 26 states and D.C. and business packages in 22, sold by independent agents. | Regional carriers | $1.04 billion | A (Excellent) |
| 76 | SECURA InsuranceWisconsin mutual founded in 1900 that sells business, nonprofit, special-event and farm insurance in 13 states through independent agents. | Regional carriers | $1.03 billion | A (Excellent) |
| 78 | AmerisureMichigan mutual founded in 1912 that insures mid-sized construction, manufacturing and healthcare firms nationwide through select independent agencies. | Regional carriers | $984.2 million | A (Excellent) |
| 82 | Frankenmuth InsuranceMichigan regional mutual founded in 1868. It sells package, auto, comp and surety coverage for businesses through independent agents in 16 states. | Regional carriers | $920.0 million | A (Excellent) |
| 96 | NJM Insurance GroupWest Trenton, N.J., mutual founded in 1913 to write workers' comp. It sells comp, commercial auto, BOP and package policies in six Mid-Atlantic states. | Regional carriers | $653.0 million | A+ (Superior) |
| 97 | Donegal Insurance GroupPennsylvania regional founded in 1889: a mutual plus its Nasdaq-listed affiliate. It sells BOP, package, auto and comp through independent agents in 21 states. | Regional carriers | $649.1 million | 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.