Guides
The 100 largest U.S. business insurance companies (2025)
The 100 largest U.S. business insurers ranked by 2025 commercial premiums (NAIC data), with ratings, phone numbers, headquarters and what each is known for.
Travelers was the largest business insurer in the United States in 2025, writing $27.13 billion in commercial premiums, followed by Chubb and Liberty Mutual. This list ranks the 100 largest by 2025 direct premiums written across 17 commercial lines of business, from NAIC market share data, and gives each company's financial strength rating, headquarters, customer service number and the profile with its full history, products, claims process and news.
The commercial market is more concentrated than most owners realize. Together the lines in this ranking came to about $484.93 billion in 2025. The 10 largest groups wrote 34.6% of it and the 100 on this list wrote 83.7%. Behind those totals are very different businesses: national carriers that write everything from a florist's business owner's policy to a Fortune 500 casualty program, regional mutuals that sell only through local agents, surplus lines specialists that take the risks standard carriers decline, workers' comp specialists and state funds, and program carriers that lend their paper to MGAs.
How to use this list
- Size is not a recommendation. A large carrier may not want your class of business, and a small one may be the specialist for it. Use the profiles to check appetite, how each company sells and how it handles claims.
- Check the rating and its date. Every rating below is dated on the insurer's profile; see AM Best ratings explained for business buyers.
- Look for the brand on your policy. NAIC ranks insurance groups, and the company named on a policy is often a subsidiary with a different name.
- Compare side by side with compare business insurers, or line by line on actual quotes with business insurance quote comparison worksheet.
The ranking at a glance
| Rank | Insurer | 2025 commercial premiums | Share | Largest lines |
|---|---|---|---|---|
| 1 | Travelers | $27.13 billion | 5.59% | other liability; commercial multiple peril |
| 2 | Chubb | $23.25 billion | 4.79% | other liability; commercial multiple peril |
| 3 | Liberty Mutual | $19.93 billion | 4.11% | inland marine; other liability |
| 4 | Berkshire Hathaway | $18.64 billion | 3.84% | other liability; commercial auto |
| 5 | Zurich North America | $14.62 billion | 3.02% | other liability; workers' compensation |
| 6 | The Hartford | $14.61 billion | 3.01% | commercial multiple peril; workers' compensation |
| 7 | AIG | $14.45 billion | 2.98% | other liability; commercial auto |
| 8 | CNA | $13.47 billion | 2.78% | other liability; inland marine |
| 9 | Progressive Commercial | $11.69 billion | 2.41% | commercial auto; inland marine |
| 10 | W. R. Berkley | $10.24 billion | 2.11% | other liability; commercial auto |
| 11 | Tokio Marine | $9.53 billion | 1.97% | commercial multiple peril; other liability |
| 12 | State Farm | $9.35 billion | 1.93% | commercial multiple peril; commercial auto |
| 13 | Fairfax Financial | $9.09 billion | 1.88% | other liability; commercial auto |
| 14 | Nationwide | $8.08 billion | 1.67% | other liability; commercial multiple peril |
| 15 | Markel | $7.73 billion | 1.59% | other liability; commercial multiple peril |
| 16 | Auto-Owners Insurance | $7.64 billion | 1.57% | commercial multiple peril; commercial auto |
| 17 | Old Republic | $7.57 billion | 1.56% | commercial auto; workers' compensation |
| 18 | Starr Insurance Companies | $7.29 billion | 1.50% | fire; other liability |
| 19 | Great American Insurance Group | $7.11 billion | 1.47% | other liability; workers' compensation |
| 20 | AXA XL | $6.76 billion | 1.39% | other liability; workers' compensation |
| 21 | Allianz Commercial | $6.61 billion | 1.36% | inland marine; other liability |
| 22 | Cincinnati Insurance | $6.32 billion | 1.30% | commercial multiple peril; other liability |
| 23 | AmTrust Financial | $6.25 billion | 1.29% | workers' compensation; other liability |
| 24 | Farmers Insurance | $5.87 billion | 1.21% | commercial multiple peril; fire |
| 25 | Arch Insurance | $5.61 billion | 1.16% | other liability; commercial auto |
| 26 | FM | $5.19 billion | 1.07% | allied lines; fire |
| 27 | Selective Insurance | $4.82 billion | 0.99% | other liability; commercial auto |
| 28 | Sompo | $4.66 billion | 0.96% | other liability; allied lines |
| 29 | The Hanover | $4.21 billion | 0.87% | commercial multiple peril; other liability |
| 30 | Erie Insurance | $3.96 billion | 0.82% | commercial multiple peril; commercial auto |
| 31 | Munich Re | $3.94 billion | 0.81% | other liability; fire |
| 32 | MSIG USA | $3.42 billion | 0.71% | other liability; allied lines |
| 33 | Allstate | $3.24 billion | 0.67% | commercial multiple peril; other liability |
| 34 | AXIS Capital | $3.23 billion | 0.67% | other liability; fire |
| 35 | Federated Insurance | $3.16 billion | 0.65% | commercial auto; other liability |
| 36 | Everest | $2.77 billion | 0.57% | other liability; allied lines |
| 37 | AF Group (Accident Fund) | $2.73 billion | 0.56% | workers' compensation; other liability |
| 38 | Acuity | $2.57 billion | 0.53% | commercial auto; other liability |
| 39 | Westfield | $2.48 billion | 0.51% | other liability; commercial multiple peril |
| 40 | Core Specialty | $2.47 billion | 0.51% | other liability; fire |
| 41 | American Family Insurance | $2.43 billion | 0.50% | other liability; commercial multiple peril |
| 42 | Argo Group and Farm Family (Clearbrook) | $2.21 billion | 0.46% | other liability; commercial multiple peril |
| 43 | Sentry Insurance | $2.21 billion | 0.46% | commercial auto; workers' compensation |
| 44 | EMC Insurance | $2.17 billion | 0.45% | commercial auto; other liability |
| 45 | QBE North America | $2.05 billion | 0.42% | other liability; workers' compensation |
| 46 | Intact Insurance Specialty Solutions | $1.94 billion | 0.40% | other liability; surety |
| 47 | Beazley | $1.94 billion | 0.40% | other liability; allied lines |
| 48 | Kinsale Insurance | $1.93 billion | 0.40% | other liability; fire |
| 49 | Swiss Re Corporate Solutions | $1.89 billion | 0.39% | other liability; fire |
| 50 | RLI | $1.83 billion | 0.38% | other liability; allied lines |
| 51 | West Bend Insurance | $1.75 billion | 0.36% | other liability; commercial auto |
| 52 | Utica National | $1.64 billion | 0.34% | commercial multiple peril; commercial auto |
| 53 | Accelerant | $1.60 billion | 0.33% | other liability; commercial multiple peril |
| 54 | New York State Insurance Fund (NYSIF) | $1.60 billion | 0.33% | workers' compensation |
| 55 | Ascot Group | $1.58 billion | 0.33% | other liability; workers' compensation |
| 56 | The Doctors Company | $1.55 billion | 0.32% | medical professional liability; other liability |
| 57 | IAT Insurance Group | $1.54 billion | 0.32% | inland marine; commercial auto |
| 58 | Coaction Specialty | $1.51 billion | 0.31% | other liability; commercial auto |
| 59 | Clear Blue Insurance Group | $1.48 billion | 0.31% | other liability; commercial auto |
| 60 | Skyward Specialty | $1.41 billion | 0.29% | other liability; commercial auto |
| 61 | GNY (Greater New York Mutual) | $1.36 billion | 0.28% | commercial multiple peril; other liability |
| 62 | Trisura | $1.34 billion | 0.28% | other liability; commercial auto |
| 63 | Fortegra | $1.33 billion | 0.27% | other liability; inland marine |
| 64 | FCCI Insurance Group | $1.27 billion | 0.26% | commercial auto; other liability |
| 65 | Applied Underwriters | $1.25 billion | 0.26% | other liability; commercial auto |
| 66 | TruStage (CUMIS) | $1.20 billion | 0.25% | other liability; commercial multiple peril |
| 67 | UFG Insurance | $1.18 billion | 0.24% | commercial multiple peril; commercial auto |
| 68 | Aspen Insurance | $1.18 billion | 0.24% | other liability; inland marine |
| 69 | ICW Group | $1.17 billion | 0.24% | workers' compensation; inland marine |
| 70 | Church Mutual | $1.14 billion | 0.24% | commercial multiple peril; other liability |
| 71 | James River | $1.13 billion | 0.23% | other liability; commercial auto |
| 72 | Western National | $1.09 billion | 0.22% | commercial auto; other liability |
| 73 | HDI Global | $1.07 billion | 0.22% | other liability; fire |
| 74 | Encova Insurance | $1.04 billion | 0.21% | workers' compensation; commercial multiple peril |
| 75 | Farm Bureau Financial Services | $1.03 billion | 0.21% | farmowners; commercial multiple peril |
| 76 | SECURA Insurance | $1.03 billion | 0.21% | commercial multiple peril; commercial auto |
| 77 | Kemper | $1.01 billion | 0.21% | commercial auto; fire |
| 78 | Amerisure | $984.2 million | 0.20% | workers' compensation; commercial auto |
| 79 | State Compensation Insurance Fund (State Fund) | $962.0 million | 0.20% | workers' compensation |
| 80 | Texas Mutual | $941.9 million | 0.19% | workers' compensation |
| 81 | ProAssurance | $927.0 million | 0.19% | medical professional liability; workers' compensation |
| 82 | Frankenmuth Insurance | $920.0 million | 0.19% | commercial multiple peril; commercial auto |
| 83 | Brotherhood Mutual | $918.8 million | 0.19% | commercial multiple peril; workers' compensation |
| 84 | Palomar | $890.2 million | 0.18% | other liability; inland marine |
| 85 | Sutton National | $877.4 million | 0.18% | other liability; fire |
| 86 | Obsidian Insurance | $866.6 million | 0.18% | other liability; fire |
| 87 | Vantage Risk | $822.5 million | 0.17% | other liability; commercial multiple peril |
| 88 | Accredited | $781.5 million | 0.16% | commercial auto; other liability |
| 89 | EMPLOYERS | $747.5 million | 0.15% | workers' compensation |
| 90 | GuideOne Insurance | $743.4 million | 0.15% | commercial multiple peril; commercial auto |
| 91 | SiriusPoint | $719.5 million | 0.15% | other liability; surety |
| 92 | SCOR | $711.6 million | 0.15% | commercial multiple peril; other liability |
| 93 | COUNTRY Financial | $691.8 million | 0.14% | farmowners; commercial multiple peril |
| 94 | Shelter Insurance | $680.0 million | 0.14% | allied lines; fire |
| 95 | MagMutual | $677.2 million | 0.14% | medical professional liability |
| 96 | NJM Insurance Group | $653.0 million | 0.13% | workers' compensation; commercial auto |
| 97 | Donegal Insurance Group | $649.1 million | 0.13% | commercial multiple peril; commercial auto |
| 98 | Mercury Insurance | $628.2 million | 0.13% | commercial auto; fire |
| 99 | Hiscox | $626.0 million | 0.13% | other liability; inland marine |
| 100 | American Coastal Insurance | $612.6 million | 0.13% | allied lines |
The 100, one by one
1. Travelers
2025 commercial premiums: $27.13 billion (5.59% of the market) · AM Best: A++ (Superior) (as of 2025-08) · Headquarters: New York, New York · Business customer service: 800-252-2268 · Claims: 800-238-6225 · Ownership: Public company (NYSE: TRV)
The largest U.S. business insurer by 2025 commercial premiums. A++ rated, sold through independent agents, No. 1 in package policies, surety and fidelity. Strongest national positions: No. 1 in commercial multiple peril; No. 1 in surety; No. 1 in fidelity; No. 2 in other liability; No. 2 in commercial auto; No. 2 in workers' compensation; No. 2 in burglary and theft; No. 3 in fire; No. 3 in boiler and machinery; No. 4 in allied lines; No. 4 in ocean marine; No. 6 in farmowners; No. 8 in inland marine; No. 9 in products liability; No. 9 in excess workers' compensation. Best suited to: Businesses from main-street shops to national accounts that buy through an independent agent and want an A++ carrier with deep package, casualty and surety capacity.
Full Travelers profile: contacts, ratings, products, history and news
2. Chubb
2025 commercial premiums: $23.25 billion (4.79% of the market) · AM Best: A++ (Superior) (as of 2026-01) · Headquarters: Zurich, Switzerland · Business customer service: 800-682-4822 · Claims: 800-252-4670 · Ownership: Public company (NYSE: CB)
Global 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. Strongest national positions: No. 1 in other liability; No. 1 in products liability; No. 1 in burglary and theft; No. 2 in boiler and machinery; No. 2 in fidelity; No. 2 in excess workers' compensation; No. 3 in commercial multiple peril; No. 3 in ocean marine; No. 4 in inland marine; No. 4 in aircraft; No. 5 in workers' compensation; No. 5 in surety; No. 10 in medical professional liability. Best suited to: Companies with significant liability, management liability or multinational exposures, and small professional and office-type firms that want an A++ carrier and value claim service over price.
Full Chubb profile: contacts, ratings, products, history and news
3. Liberty Mutual
2025 commercial premiums: $19.93 billion (4.11% of the market) · AM Best: A (Excellent) (as of 2026-10) · Headquarters: Boston, Massachusetts · Business customer service: 800-320-7582 · Claims: 844-325-2467 · Ownership: Mutual holding company owned by its policyholders
Boston-based mutual and No. 3 U.S. business insurer. Leading surety writer, sells small business coverage through independent agents and E&S via Ironshore. Strongest national positions: No. 1 in inland marine; No. 2 in surety; No. 3 in excess workers' compensation; No. 4 in farmowners; No. 5 in commercial auto; No. 5 in fire; No. 5 in boiler and machinery; No. 6 in medical professional liability; No. 7 in commercial multiple peril; No. 8 in workers' compensation; No. 9 in allied lines; No. 10 in other liability. Best suited to: Middle-market and large companies that want one carrier for casualty, surety and risk control, and small businesses that buy through an independent agent.
Full Liberty Mutual profile: contacts, ratings, products, history and news
4. Berkshire Hathaway
2025 commercial premiums: $18.64 billion (3.84% of the market) · AM Best: A++ (Superior) (as of 2026-02) · Headquarters: Omaha, Nebraska · Ownership: Public company (NYSE: BRK.A and BRK.B)
No. 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. Strongest national positions: No. 1 in medical professional liability; No. 2 in fire; No. 3 in other liability; No. 3 in commercial auto; No. 3 in allied lines; No. 6 in workers' compensation; No. 8 in aircraft. Best suited to: Buyers who want Berkshire-backed paper for a specific need: direct small business coverage (biBERK), medical malpractice (MedPro), or large and specialty risks placed by a broker (BHSI, RSUI).
Full Berkshire Hathaway profile: contacts, ratings, products, history and news
5. Zurich North America
2025 commercial premiums: $14.62 billion (3.02% of the market) · AM Best: A+ (Superior) (as of 2025-03) · Headquarters: Schaumburg, Illinois · Ownership: Subsidiary of Zurich Insurance Group (SIX Swiss Exchange)
U.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. Strongest national positions: No. 2 in allied lines; No. 3 in burglary and theft; No. 4 in workers' compensation; No. 4 in surety; No. 5 in inland marine; No. 5 in excess workers' compensation; No. 6 in boiler and machinery; No. 7 in commercial auto; No. 8 in ocean marine; No. 9 in fidelity. Best suited to: Mid-size and large companies, especially contractors, manufacturers, auto dealers and multinationals, that buy through a broker and want a global carrier with risk engineering.
Full Zurich North America profile: contacts, ratings, products, history and news
6. The Hartford
2025 commercial premiums: $14.61 billion (3.01% of the market) · AM Best: A+ (Superior) (as of 2026-07) · Headquarters: Hartford, Connecticut · Business customer service: 866-467-8730 · Claims: 800-327-3636 · Ownership: Public company (NYSE: HIG)
Connecticut 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. Strongest national positions: No. 1 in workers' compensation; No. 2 in commercial multiple peril; No. 4 in products liability; No. 6 in ocean marine; No. 7 in fidelity; No. 10 in commercial auto; No. 10 in surety. Best suited to: Small and midsize businesses that want a large, highly rated carrier for a BOP and workers' comp, and middle-market accounts placed through brokers.
Full The Hartford profile: contacts, ratings, products, history and news
7. AIG
2025 commercial premiums: $14.45 billion (2.98% of the market) · AM Best: A (Excellent) (as of 2025-11) · Headquarters: New York, New York · Business customer service: 877-867-3783 · Claims: 800-242-2418 · Ownership: Public company (NYSE: AIG)
Global 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. Strongest national positions: No. 1 in ocean marine; No. 2 in aircraft; No. 2 in products liability; No. 4 in boiler and machinery; No. 4 in fidelity; No. 5 in other liability; No. 6 in inland marine; No. 7 in fire; No. 8 in allied lines; No. 8 in excess workers' compensation; No. 9 in commercial auto. Best suited to: Middle-market, large and multinational companies, and hard-to-place E&S risks, that buy through a broker and need high limits, financial lines or global programs.
Full AIG profile: contacts, ratings, products, history and news
8. CNA
2025 commercial premiums: $13.47 billion (2.78% of the market) · AM Best: A+ (Superior) (as of 2025-12) · Headquarters: Chicago, Illinois · Business customer service: 800-262-2000 · Claims: 877-574-0540 · Ownership: Public company (NYSE: CNA), majority-owned by Loews Corporation
Chicago commercial insurer controlled by Loews, sold through agents and brokers. Strong in professional liability, healthcare, surety and specialty lines. Strongest national positions: No. 2 in inland marine; No. 3 in medical professional liability; No. 3 in surety; No. 4 in burglary and theft; No. 5 in fidelity; No. 7 in other liability; No. 9 in boiler and machinery. Best suited to: Professionals, healthcare organizations, contractors and mid-sized companies that buy through an agent or broker and want specialized underwriting in liability, professional and surety lines.
Full CNA profile: contacts, ratings, products, history and news
9. Progressive Commercial
2025 commercial premiums: $11.69 billion (2.41% of the market) · AM Best: A+ (Superior) (as of 2026-05) · Headquarters: Mayfield Village, Ohio · Business customer service: 800-444-4487 · Claims: 800-776-4737 · Ownership: Public company (NYSE: PGR)
The largest U.S. commercial auto insurer, for work vehicles, trucks and tow trucks, sold by agents and online. Most other business lines come from partners. Strongest national positions: No. 1 in commercial auto. Best suited to: Businesses whose main exposure is vehicles, from a contractor with two pickups to a for-hire trucker or tow operator, buying through an agent or online.
Full Progressive Commercial profile: contacts, ratings, products, history and news
10. W. R. Berkley
2025 commercial premiums: $10.24 billion (2.11% of the market) · AM Best: A+ (Superior) (as of 2026-06) · Headquarters: Greenwich, Connecticut · Ownership: Public company (NYSE: WRB); Berkley family and Mitsui Sumitomo Insurance are major shareholders
Greenwich, Conn., insurer running about 60 specialized units in E&S, specialty, regional and workers' comp lines, sold through agents, brokers and wholesalers. Strongest national positions: No. 3 in products liability; No. 4 in other liability; No. 10 in burglary and theft. Best suited to: Businesses with specialized or hard-to-place exposures, such as contractors, healthcare, energy, transportation fleets and professional firms, that buy through a broker or wholesaler.
Full W. R. Berkley profile: contacts, ratings, products, history and news
11. Tokio Marine
2025 commercial premiums: $9.53 billion (1.97% of the market) · AM Best: A++ (Superior) (as of 2025-10) · Headquarters: Tokyo, Japan (largest U.S. units in Bala Cynwyd, Pennsylvania; Houston; and St. Louis) · Business customer service: 877-438-7459 · Claims: 800-765-9749 · Ownership: Public company (Tokyo Stock Exchange: 8766)
Japan's Tokio Marine owns Philadelphia Insurance, Tokio Marine HCC and Safety National: niche package, specialty lines and excess workers' comp. Strongest national positions: No. 1 in excess workers' compensation; No. 5 in commercial multiple peril; No. 5 in ocean marine; No. 6 in surety; No. 9 in aircraft. Best suited to: Nonprofits, real estate owners and other niche small and midsize accounts placed through an agent, plus large self-insured employers buying excess workers' comp.
Full Tokio Marine profile: contacts, ratings, products, history and news
12. State Farm
2025 commercial premiums: $9.35 billion (1.93% of the market) · AM Best: A+ (Superior) (as of 2025-11) · Headquarters: Bloomington, Illinois · Business customer service: 800-782-8332 · Claims: 800-732-5246 · Ownership: Mutual company owned by its policyholders
The largest U.S. personal-lines insurer also writes BOPs, commercial auto, contractors and farm policies for small businesses through its own agents. Strongest national positions: No. 3 in farmowners; No. 4 in commercial multiple peril; No. 6 in commercial auto; No. 9 in inland marine. Best suited to: Small businesses, contractors and farms that want a local agent and like keeping business, auto, home and life coverage with one company.
Full State Farm profile: contacts, ratings, products, history and news
13. Fairfax Financial
2025 commercial premiums: $9.09 billion (1.88% of the market) · AM Best: A+ (Superior) (as of 2026-05) · Headquarters: Toronto, Ontario, Canada · Ownership: Public company (Toronto Stock Exchange: FFH)
Toronto-based Fairfax owns Crum & Forster, Allied World, Zenith and Hudson: specialty, excess and surplus lines and workers' comp sold through brokers. Strongest national positions: No. 6 in other liability; No. 8 in surety; No. 10 in products liability. Best suited to: Midsize and larger businesses with specialty, excess or hard-to-place exposures placed by a broker, and employers that want a workers' comp specialist.
Full Fairfax Financial profile: contacts, ratings, products, history and news
14. Nationwide
2025 commercial premiums: $8.08 billion (1.67% of the market) · AM Best: A (Excellent) (as of 2025-11) · Headquarters: Columbus, Ohio · Claims: 800-421-3535 · Ownership: Mutual company owned by its policyholders
Columbus mutual writing small business, middle market, agribusiness, E&S and program business through independent agents; No. 2 in U.S. farmowners. Strongest national positions: No. 2 in farmowners. Best suited to: Small and midsize businesses, farms and agribusinesses that want an independent agent and a large mutual carrier with specialty and E&S capacity in the same group.
Full Nationwide profile: contacts, ratings, products, history and news
15. Markel
2025 commercial premiums: $7.73 billion (1.59% of the market) · AM Best: A (Excellent) (as of 2026-09) · Headquarters: Glen Allen, Virginia · Business customer service: 800-446-6671 · Claims: 800-362-7535 · Ownership: Public company (NYSE: MKL)
Virginia specialty insurer writing E&S, professional liability, programs, surety and niche small business packages through wholesalers, agents and MGAs. Strongest national positions: No. 8 in other liability; No. 10 in ocean marine. Best suited to: Small and midsize businesses in niche or hard-to-place classes, and buyers of professional, management or environmental liability, placed through a wholesale broker or agent.
Full Markel profile: contacts, ratings, products, history and news
16. Auto-Owners Insurance
2025 commercial premiums: $7.64 billion (1.57% of the market) · AM Best: A+ (Superior) (as of 2024-10) · Headquarters: Lansing, Michigan · Business customer service: 800-346-0346 · Claims: 888-252-4626 · Ownership: Mutual insurance company (owned by its policyholders)
Lansing, Michigan mutual that sells only through independent agents in 26 states; a top-10 U.S. writer of commercial package, commercial auto and fire. Strongest national positions: No. 6 in commercial multiple peril; No. 8 in commercial auto; No. 8 in fire. Best suited to: Small and midsize businesses in its 26 states that want a package policy, commercial auto and workers' comp placed through a local independent agent with local claims service.
Full Auto-Owners Insurance profile: contacts, ratings, products, history and news
17. Old Republic
2025 commercial premiums: $7.57 billion (1.56% of the market) · AM Best: A+ (Superior) (as of 2026-04) · Headquarters: Chicago, Illinois · Business customer service: 312-346-8100 · Claims: 800-747-5256 · Ownership: Public company (NYSE: ORI)
Chicago-based specialty group (NYSE: ORI) behind Great West trucking, Bitco construction, PMA comp and large-deductible programs; No. 4 in U.S. commercial auto. Strongest national positions: No. 4 in commercial auto; No. 6 in aircraft; No. 9 in workers' compensation; No. 10 in excess workers' compensation. Best suited to: Mid-sized and larger trucking, construction, energy and manufacturing firms whose brokers want a specialist carrier, loss-sensitive comp programs or captive support.
Full Old Republic profile: contacts, ratings, products, history and news
18. Starr Insurance Companies
2025 commercial premiums: $7.29 billion (1.50% of the market) · AM Best: A (Excellent) (as of 2026-02) · Headquarters: New York, New York · Business customer service: 646-227-6300 · Claims: 855-782-7725 · Ownership: Private; insurance companies owned by Starr International Company, Inc.
Privately held global specialty insurer based in New York; the No. 1 U.S. writer of commercial fire and aircraft insurance and No. 2 in ocean marine. Strongest national positions: No. 1 in fire; No. 1 in aircraft; No. 2 in ocean marine. Best suited to: Mid-sized to large companies, and brokers placing property towers, aviation, marine, energy, construction and executive risk that need a specialist market.
Full Starr Insurance Companies profile: contacts, ratings, products, history and news
19. Great American Insurance Group
2025 commercial premiums: $7.11 billion (1.47% of the market) · AM Best: A+ (Superior) (as of 2025-12) · Headquarters: Cincinnati, Ohio · Business customer service: 800-545-4269 · Claims: 844-424-4669 · Ownership: Subsidiary of a public company (American Financial Group, NYSE: AFG)
Cincinnati specialty insurer owned by American Financial Group (NYSE: AFG), running 30-plus niche units in comp, trucking, construction, crime and marine. Strongest national positions: No. 3 in fidelity; No. 7 in ocean marine; No. 8 in products liability. Best suited to: Businesses in a defined niche (trucking, passenger transport, movers, nonprofits, farms, homebuilders, financial institutions) whose broker wants a specialist underwriter and claims team.
Full Great American Insurance Group profile: contacts, ratings, products, history and news
20. AXA XL
2025 commercial premiums: $6.76 billion (1.39% of the market) · AM Best: A+ (Superior) (as of 2026-03) · Headquarters: Stamford, Connecticut (U.S. home office); parent AXA SA is based in Paris · Claims: 877-720-8844 · Ownership: Division of AXA SA, a publicly traded French insurance group
AXA's commercial and specialty division, built on XL Group (bought 2018); writes liability, excess, property and specialty lines for mid-size and large firms. Strongest national positions: No. 5 in burglary and theft; No. 7 in boiler and machinery; No. 7 in excess workers' compensation; No. 9 in other liability; No. 10 in aircraft. Best suited to: Mid-sized and large companies, and multinationals, whose brokers need large liability limits, property and engineering capacity, captive solutions or E&S placements.
Full AXA XL profile: contacts, ratings, products, history and news
21. Allianz Commercial
2025 commercial premiums: $6.61 billion (1.36% of the market) · AM Best: A+ (Superior) (as of 2026-03) · Headquarters: Munich, Germany (Allianz SE); Allianz Commercial's U.S. offices are in Chicago, New York, Alpharetta, O'Fallon (St. Louis area) and Houston · Claims: 800-558-1606 · Ownership: Subsidiaries of Allianz SE, a publicly traded German insurance group
Allianz's commercial arm (formerly AGCS, absorbing Fireman's Fund); large corporate property, casualty, marine, aviation and specialty cover through brokers. Strongest national positions: No. 3 in inland marine; No. 6 in products liability; No. 7 in aircraft; No. 9 in fire. Best suited to: Large and multinational companies whose brokers need high-limit property, liability, marine, aviation or construction capacity, captive support or alternative risk transfer.
Full Allianz Commercial profile: contacts, ratings, products, history and news
22. Cincinnati Insurance
2025 commercial premiums: $6.32 billion (1.30% of the market) · AM Best: A+ (Superior) (as of 2026-02) · Headquarters: Fairfield, Ohio · Business customer service: 888-242-8811 · Claims: 877-242-2544 · Ownership: Public company (Nasdaq: CINF)
Ohio 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. Strongest national positions: No. 6 in burglary and theft; No. 8 in commercial multiple peril. Best suited to: Small and midsized businesses, especially contractors, real estate owners, health care and nonprofit organizations, that want a three-year package and a local agent and claims rep.
Full Cincinnati Insurance profile: contacts, ratings, products, history and news
23. AmTrust Financial
2025 commercial premiums: $6.25 billion (1.29% of the market) · AM Best: A- (Excellent) (as of 2026-10) · Headquarters: New York, New York (operations headquarters in Cleveland, Ohio) · Business customer service: 877-528-7878 · Claims: 844-451-0750 · Ownership: Private company since 2018 (Karfunkel-Zyskind family and funds managed by Stone Point Capital)
New York-based, privately held insurer; the No. 3 U.S. workers' comp writer, also selling BOPs, packages, E&S and MGA programs through agents. Strongest national positions: No. 3 in workers' compensation. Best suited to: Small and mid-sized employers, especially in contracting, restaurants, retail and services, that want workers' comp alone or packaged with a BOP through a local agent.
Full AmTrust Financial profile: contacts, ratings, products, history and news
24. Farmers Insurance
2025 commercial premiums: $5.87 billion (1.21% of the market) · AM Best: A (Excellent) (as of 2025-08) · Headquarters: Los Angeles, California (home office); customer service in Woodland Hills, California · Business customer service: 888-327-6335 · Claims: 800-435-7764 · Ownership: Reciprocal exchanges owned by their policyholders; managed by Farmers Group, Inc., a subsidiary of Zurich Insurance Group, as attorney-in-fact
Policyholder-owned personal-lines group managed by Zurich's Farmers Group; sells small-business package, auto and workers' comp through Farmers agents. Strongest national positions: No. 6 in fire; No. 7 in allied lines; No. 10 in commercial multiple peril. Best suited to: Small businesses such as apartment owners, auto repair shops, restaurants, retailers and contractors that want a local Farmers agent to package business, home and auto coverage.
Full Farmers Insurance profile: contacts, ratings, products, history and news
25. Arch Insurance
2025 commercial premiums: $5.61 billion (1.16% of the market) · AM Best: A+ (Superior) (as of 2026-10) · Headquarters: Executive offices in New York City and operations center in Jersey City, New Jersey; parent Arch Capital Group is based in Bermuda · Business customer service: 201-743-4000 · Claims: 877-688-2724 · Ownership: Subsidiaries of Arch Capital Group Ltd., a public company (Nasdaq: ACGL)
U.S. arm of Bermuda-based Arch Capital; specialty, E&S and (since buying Allianz's book in 2024) middle market P&C through brokers, MGAs and programs. Strongest national positions: No. 4 in excess workers' compensation. Best suited to: Mid-sized and larger companies, and specialty or hard-to-place risks, whose brokers want a highly rated specialty market for casualty, E&S, programs, surety or alternative markets.
Full Arch Insurance profile: contacts, ratings, products, history and news
26. FM
2025 commercial premiums: $5.19 billion (1.07% of the market) · AM Best: A+ (Superior) (as of 2026-01) · Headquarters: Johnston, Rhode Island · Business customer service: 401-275-3000 · Ownership: Mutual insurance company owned by its policyholders
Policyholder-owned property insurer (formerly FM Global) for large and midsize companies, known for engineering-led loss prevention and member credits. Strongest national positions: No. 1 in allied lines; No. 1 in boiler and machinery; No. 4 in fire; No. 10 in inland marine. Best suited to: Large and middle-market companies with high-value plants, warehouses, data centers or real estate that will invest in engineering recommendations to lower losses.
Full FM profile: contacts, ratings, products, history and news
27. Selective Insurance
2025 commercial premiums: $4.82 billion (0.99% of the market) · AM Best: A+ (Superior) (as of 2025-12) · Headquarters: Short Hills, New Jersey (corporate headquarters since 2026); insurance operations based in Branchville, New Jersey · Business customer service: 877-744-3125 · Claims: 866-455-9969 · Ownership: Public company (Nasdaq: SIGI)
New Jersey super-regional selling commercial package, auto, comp and bonds through independent agents in 38 states, plus E&S nationwide via MUSIC. Strongest national positions: No. 5 in products liability; No. 10 in boiler and machinery. Best suited to: Contractors, manufacturers, mercantile and community-service businesses in its 38-state footprint that want a field-based carrier through a local independent agent.
Full Selective Insurance profile: contacts, ratings, products, history and news
28. Sompo
2025 commercial premiums: $4.66 billion (0.96% of the market) · AM Best: A+ (Superior) (as of 2026-03) · Headquarters: Pembroke, Bermuda (largest U.S. office in New York City) · Business customer service: 212-209-6500 · Claims: 877-676-7575 · Ownership: Wholly owned by Sompo Holdings, Inc. (Tokyo Stock Exchange: 8630) through Sompo Japan Insurance Inc.
Bermuda-based commercial arm of Japan's Sompo Holdings (formerly Endurance): casualty, property, professional lines, surety and crop through brokers. Strongest national positions: No. 5 in aircraft. Best suited to: Middle-market and large companies, especially Japanese and other Asian-owned businesses in the U.S., buying casualty, property or professional lines through a broker.
Full Sompo profile: contacts, ratings, products, history and news
29. The Hanover
2025 commercial premiums: $4.21 billion (0.87% of the market) · AM Best: A (Excellent) (as of 2025-07) · Headquarters: Worcester, Massachusetts · Business customer service: 800-922-8427 · Claims: 800-628-0250 · Ownership: Public company (NYSE: THG)
Worcester, Mass., agency carrier (est. 1852) writing small and midsize business packages, comp and auto, plus specialty lines, in 44 states and D.C. Best suited to: Small and middle-market businesses in its target industries, such as technology, human services and education, that want a package, comp and specialty lines from one carrier through a local agent.
Full The Hanover profile: contacts, ratings, products, history and news
30. Erie Insurance
2025 commercial premiums: $3.96 billion (0.82% of the market) · AM Best: A (Excellent) (as of 2025-09) · Headquarters: Erie, Pennsylvania · Business customer service: 800-458-0811 · Claims: 800-367-3743 · Ownership: Reciprocal insurer owned by its policyholders (Erie Insurance Exchange), managed for a fee by Erie Indemnity Company (Nasdaq: ERIE)
Policyholder-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. Strongest national positions: No. 9 in commercial multiple peril. Best suited to: Small and midsize businesses in ERIE's 12 states and D.C., such as contractors, restaurants, retailers and offices, that want a local agent and strong claims service.
Full Erie Insurance profile: contacts, ratings, products, history and news
31. Munich Re
2025 commercial premiums: $3.94 billion (0.81% of the market) · AM Best: A+ (Superior) (as of 2026-07) · Headquarters: Munich, Germany (U.S. operations based in Princeton, New Jersey; HSB in Hartford, Connecticut; NEXT in Palo Alto, California) · Business customer service: 800-305-4954 · Claims: 888-729-2242 · Ownership: Public company (Xetra: MUV2)
The German reinsurer's U.S. arm: Munich Re Specialty's E&S, public entity, surety and program business, plus HSB equipment breakdown and NEXT. Strongest national positions: No. 3 in aircraft; No. 8 in boiler and machinery; No. 10 in fire. Best suited to: Brokers placing hard-to-fit middle-market and public entity risks, MGAs needing a carrier for a program, and small businesses buying online through NEXT.
Full Munich Re profile: contacts, ratings, products, history and news
32. MSIG USA
2025 commercial premiums: $3.42 billion (0.71% of the market) · AM Best: A+ (Superior) (as of 2026-06) · Headquarters: New York, New York (operational headquarters in Warren, New Jersey); parent based in Tokyo, Japan · Business customer service: 800-388-1802 · Claims: 866-676-6872 · Ownership: Subsidiary of Mitsui Sumitomo Insurance Company, Limited, part of MS&AD Insurance Group Holdings (Tokyo Stock Exchange: 8725)
U.S. commercial arm of Japan's MS&AD: property, casualty, marine and financial lines for mid-size and multinational firms, plus MS Transverse fronting. Best suited to: Mid-size and large companies, including U.S. operations of foreign-owned multinationals, buying property, casualty and marine coverage through a broker.
Full MSIG USA profile: contacts, ratings, products, history and news
33. Allstate
2025 commercial premiums: $3.24 billion (0.67% of the market) · AM Best: A+ (Superior) (as of 2026-09) · Headquarters: Northbrook, Illinois · Business customer service: 800-255-7828 · Claims: 800-255-7828 · Ownership: Public company (NYSE: ALL)
The big personal auto and home insurer has pulled back from Allstate-brand commercial policies; it now sells commercial auto through National General. Best suited to: Owners who already insure their car and home with Allstate and need a commercial auto policy for a work truck or van through the same agent.
Full Allstate profile: contacts, ratings, products, history and news
34. AXIS Capital
2025 commercial premiums: $3.23 billion (0.67% of the market) · AM Best: A (Excellent) (as of 2026-09) · Headquarters: Pembroke, Bermuda (U.S. headquarters in Alpharetta, Georgia) · Business customer service: 678-746-9000 · Ownership: Public company (NYSE: AXS)
Bermuda-based specialty insurer selling E&S casualty and property, professional, management, cyber and construction lines to mid-size and large U.S. firms. Strongest national positions: No. 8 in burglary and theft; No. 10 in fidelity. Best suited to: Mid-size and large companies with hard-to-place casualty, catastrophe-exposed property, construction, environmental or management liability risks placed by a specialist broker.
Full AXIS Capital profile: contacts, ratings, products, history and news
35. Federated Insurance
2025 commercial premiums: $3.16 billion (0.65% of the market) · AM Best: A+ (Superior) (as of 2026-04) · Headquarters: Owatonna, Minnesota · Business customer service: 888-333-4949 (Client Contact Center, policy service) · Claims: 888-333-4949 (Client Contact Center; claims can also be reported online) · Ownership: Mutual insurance company owned by its policyholders
Minnesota mutual founded in 1904 that sells property, casualty, life and bonds directly to businesses in select industries, backed by 500+ trade associations. Best suited to: Owner-run dealers, contractors, fuel marketers, funeral homes, manufacturers and wholesalers that want property, casualty, life and bonds from one company through a local representative rather than a broker.
Full Federated Insurance profile: contacts, ratings, products, history and news
36. Everest
2025 commercial premiums: $2.77 billion (0.57% of the market) · AM Best: A+ (Superior) (as of 2025-10) · Headquarters: Hamilton, Bermuda (U.S. headquarters in Warren, New Jersey) · Business customer service: 908-604-3000 · Claims: 855-252-4695 · Ownership: Public company (NYSE: EG)
Bermuda-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. Best suited to: Brokers placing hard-to-place casualty, construction, energy or environmental risks in the E&S market, or small accounts that fit one of its program administrators' niches.
Full Everest profile: contacts, ratings, products, history and news
37. AF Group (Accident Fund)
2025 commercial premiums: $2.73 billion (0.56% of the market) · AM Best: A (Excellent) (as of 2026-02) · Headquarters: Lansing, Michigan · Business customer service: 866-206-5851 · Claims: 866-206-5851 · Ownership: Subsidiary of Blue Cross Blue Shield of Michigan; definitive agreement (February 2026) to sell to Enstar Group, pending
Lansing, Michigan workers' comp specialist (Accident Fund, United Heartland, CompWest) owned by Blue Cross Blue Shield of Michigan; sale to Enstar pending. Strongest national positions: No. 10 in workers' compensation. Best suited to: Employers of almost any size whose agent wants a workers' comp specialist with strong claims and medical management, plus small E&S and trucking risks through its specialty brands.
Full AF Group (Accident Fund) profile: contacts, ratings, products, history and news
38. Acuity
2025 commercial premiums: $2.57 billion (0.53% of the market) · AM Best: A+ (Superior) (as of 2026-03) · Headquarters: Sheboygan, Wisconsin · Business customer service: 800-242-7666 · Claims: 800-242-7666 · Ownership: Mutual insurance company (owned by its policyholders)
Sheboygan, Wisconsin mutual selling through independent agents in 30-plus states; a major trucking insurer, rated A+ by both AM Best and S&P. Best suited to: Trucking operations, contractors, manufacturers and other small to mid-sized Main Street businesses in its Midwest-centered territory that want a strongly rated mutual through a local independent agent.
Full Acuity profile: contacts, ratings, products, history and news
39. Westfield
2025 commercial premiums: $2.48 billion (0.51% of the market) · AM Best: A (Excellent) (as of 2025-03) · Headquarters: Westfield Center, Ohio · Business customer service: 800-243-0210 · Claims: 800-243-0210 (option 3) · Ownership: Privately held; Ohio Farmers Insurance Company, which began as a farmers' mutual, is the ultimate parent
Ohio regional founded in 1848, selling commercial, farm and surety coverage through independent agents, plus E&S and Lloyd's capacity via Westfield Specialty. Best suited to: Contractors, manufacturers, distributors, farms and other Main Street businesses in its 21-state footprint that want an agent-placed package, comp and bonds from one carrier.
Full Westfield profile: contacts, ratings, products, history and news
40. Core Specialty
2025 commercial premiums: $2.47 billion (0.51% of the market) · AM Best: A (Excellent) (as of 2026-10) · Headquarters: Cincinnati, Ohio · Claims: 800-521-6155 (Lancer commercial auto claims, 24/7) · Ownership: Privately held; formed through a 2020 recapitalization led by SkyKnight Capital, Dragoneer Investment Group and Aquiline Capital Partners, with Enstar keeping a stake
Cincinnati specialty insurer built from StarStone U.S. in 2020; writes E&S and admitted casualty, property, Lancer auto, comp and bonds via brokers. Best suited to: Contractors, energy firms, transportation fleets, product manufacturers and hard-to-place property owners whose broker wants a specialty market with both admitted and surplus lines paper.
Full Core Specialty profile: contacts, ratings, products, history and news
41. American Family Insurance
2025 commercial premiums: $2.43 billion (0.50% of the market) · AM Best: A (Excellent) (as of 2025-09) · Headquarters: Madison, Wisconsin · Business customer service: 800-692-6326 (1-800-MYAMFAM) · Claims: 800-692-6326 (1-800-MYAMFAM) · Ownership: Mutual insurance company owned by its policyholders
Wisconsin mutual known for home and auto; insures small businesses and farms through AmFam agents and Main Street America's independent agents. Strongest national positions: No. 8 in farmowners. Best suited to: Main Street businesses, landlords and family farms that want business coverage from the same agent who writes their home and auto, or from an independent agent through Main Street America.
Full American Family Insurance profile: contacts, ratings, products, history and news
42. Argo Group and Farm Family (Clearbrook)
2025 commercial premiums: $2.21 billion (0.46% of the market) · AM Best: A- (Excellent) for Argo companies; A (Excellent) for Farm Family Insurance Group (as of 2026-04) · Headquarters: New York, New York · Business customer service: 210-321-8400 (Argo Group) · Claims: 833-240-4128 (Argo commercial lines and workers' comp claims) · Ownership: Wholly owned by Brookfield Wealth Solutions Ltd. (Argo acquired November 2023; American National acquired May 2022)
Brookfield's U.S. P&C arm: Argo specialty casualty, E&S, garage and Rockwood comp through brokers, plus Farm Family farm and small business cover. Best suited to: Contractors, delivery fleets, energy and industrial firms with hard-to-place casualty or comp needs placed by a broker, and Northeast farms and small businesses that want a local agent.
Full Argo Group and Farm Family (Clearbrook) profile: contacts, ratings, products, history and news
43. Sentry Insurance
2025 commercial premiums: $2.21 billion (0.46% of the market) · AM Best: A+ (Superior) (as of 2026-07) · Headquarters: Stevens Point, Wisconsin · Business customer service: 800-473-6879 · Claims: 800-473-6879 · Ownership: Mutual holding company structure since January 1, 2021; Sentry Mutual Holding Company is the parent
Wisconsin mutual founded in 1904 that insures manufacturers, dealers, truckers and large employers, plus Hortica and specialty programs; owns The General. Best suited to: Manufacturers, dealerships, trucking fleets and large multi-location employers that want comp, auto and liability from a carrier with industry-dedicated sales, safety and claims teams.
Full Sentry Insurance profile: contacts, ratings, products, history and news
44. EMC Insurance
2025 commercial premiums: $2.17 billion (0.45% of the market) · AM Best: A (Excellent) (as of 2025-10) · Headquarters: Des Moines, Iowa · Business customer service: 800-447-2295 · Claims: 888-362-2255 · Ownership: Mutual insurance company (policyholder-owned); privately held since buying out the public shares of EMC Insurance Group in 2019
Des Moines mutual founded in 1911, selling commercial property, auto, liability, workers' comp and surety bonds through independent agents in over 40 states. Best suited to: Contractors, manufacturers, wholesalers, retailers and other middle-market businesses that want an agent-placed commercial package, fleet auto and bonds from a mutual carrier.
Full EMC Insurance profile: contacts, ratings, products, history and news
45. QBE North America
2025 commercial premiums: $2.05 billion (0.42% of the market) · AM Best: A (Excellent) (as of 2026-07) · Headquarters: New York, New York · Business customer service: 800-362-5448 · Claims: 844-723-2524 · Ownership: Subsidiary of QBE Insurance Group Limited, a public company listed on the Australian Securities Exchange (ASX: QBE)
U.S. arm of Australia's QBE, writing specialty casualty, financial lines, construction, large-account property, programs, A&H and crop via brokers and agents. Best suited to: Mid-size and large companies, contractors and program niches that need specialty casualty, financial lines, shared property capacity or A&H, placed through a broker.
Full QBE North America profile: contacts, ratings, products, history and news
46. Intact Insurance Specialty Solutions
2025 commercial premiums: $1.94 billion (0.40% of the market) · AM Best: A+ (Superior) (as of 2026-05) · Headquarters: Plymouth, Minnesota · Business customer service: 800-662-0156 · Claims: 877-248-3455 · Ownership: Subsidiary of Intact Financial Corporation, a public company listed on the Toronto Stock Exchange (TSX: IFC)
U.S. specialty arm of Canada's Intact Financial (formerly OneBeacon), writing surety, marine, A&H, tech, entertainment and management liability via brokers. Strongest national positions: No. 7 in surety; No. 9 in ocean marine. Best suited to: Mid-sized companies with a specialized exposure (tech, entertainment, marine, construction, trucking, financial services) and contractors or corporations that need surety capacity, placed through a broker.
Full Intact Insurance Specialty Solutions profile: contacts, ratings, products, history and news
47. Beazley
2025 commercial premiums: $1.94 billion (0.40% of the market) · AM Best: A (Excellent) (as of 2026-03) · Headquarters: London, England (U.S. offices led from West Hartford, Connecticut) · Business customer service: 860-677-3700 · Claims: 866-567-8570 · Ownership: Subsidiary of Zurich Insurance Group since October 1, 2026; previously listed on the London Stock Exchange (delisted October 2, 2026)
Lloyd's specialty insurer known for cyber, D&O and E&S property, acquired by Zurich on Oct. 1, 2026; sells through brokers on admitted, E&S and Lloyd's paper. Strongest national positions: No. 8 in fidelity. Best suited to: Companies of most sizes buying cyber, D&O, E&O or other specialty liability, and owners of hard-to-place or catastrophe-exposed property, placed through a broker.
Full Beazley profile: contacts, ratings, products, history and news
48. Kinsale Insurance
2025 commercial premiums: $1.93 billion (0.40% of the market) · AM Best: A (Excellent) (as of 2026-08) · Headquarters: Richmond, Virginia · Business customer service: 804-289-1300 · Ownership: Public company (NYSE: KNSL)
Richmond, Va., E&S-only insurer founded in 2009, writing hard-to-place casualty, property and professional risks for small and midsize firms via wholesalers. Strongest national positions: No. 7 in products liability. Best suited to: Small and midsize businesses that standard carriers have declined, such as contractors with losses, high-hazard manufacturers, cannabis and firearms businesses, and hard-to-place property, placed through a wholesale broker.
Full Kinsale Insurance profile: contacts, ratings, products, history and news
49. Swiss Re Corporate Solutions
2025 commercial premiums: $1.89 billion (0.39% of the market) · AM Best: A+ (Superior) (as of 2026-09) · Headquarters: Zurich, Switzerland (U.S. business led from Armonk, New York; U.S. carriers administered from Kansas City, Missouri) · Business customer service: 914-828-8000 · Claims: 816-235-3702 · Ownership: Subsidiary of Swiss Re Ltd, a public company listed on the SIX Swiss Exchange
Swiss Re's commercial insurance arm: high-capacity property, casualty, professional, surety, stop loss and captive fronting for large U.S. companies. Best suited to: Large and upper-middle-market companies, multinationals and captive owners that need highly rated property, casualty, surety or alternative risk capacity placed by a broker.
Full Swiss Re Corporate Solutions profile: contacts, ratings, products, history and news
50. RLI
2025 commercial premiums: $1.83 billion (0.38% of the market) · AM Best: A++ (Superior) (as of 2026-02) · Headquarters: Peoria, Illinois · Business customer service: 800-331-4929 · Claims: 800-444-0406 · Ownership: Public company (NYSE: RLI)
Peoria, Illinois specialty insurer writing E&S and niche admitted casualty, property, trucking and surety through brokers and agents; rated A++ by AM Best. Best suited to: Businesses with specialized or hard-to-place exposures (excess casualty, trucking, coastal or earthquake property, contractor bonds, design firm E&O) placed by a broker or agent appointed with RLI.
Full RLI profile: contacts, ratings, products, history and news
51. West Bend Insurance
2025 commercial premiums: $1.75 billion (0.36% of the market) · AM Best: A (Excellent) (as of 2025-08) · Headquarters: West Bend, Wisconsin · Business customer service: 262-334-5571 · Claims: 877-922-5246 · Ownership: Owned by West Bend Mutual Holding Company (policyholder-owned) through WBM Corporation; converted from a mutual insurer under a plan approved in December 2023
Wisconsin regional founded in 1894 that sells business insurance in 14 states and surety bonds nationwide through independent agents only. Best suited to: Small and mid-sized businesses in its 14 Midwest and Southeast states that want package, auto, comp and bonds from one agent-placed regional carrier.
Full West Bend Insurance profile: contacts, ratings, products, history and news
52. Utica National
2025 commercial premiums: $1.64 billion (0.34% of the market) · AM Best: A (Excellent) (as of 2024-11) · Headquarters: New Hartford, New York · Business customer service: 800-598-8422 · Claims: 800-216-1420 · Ownership: Mutual company owned by its policyholders (Utica Mutual Insurance Company is the principal company)
Upstate New York mutual founded in 1914, known for school, volunteer fire department and insurance agents' E&O programs, sold through independent agents. Best suited to: Schools, volunteer fire departments, religious institutions, insurance agencies and main street businesses that want a specialty program through a local independent agent.
Full Utica National profile: contacts, ratings, products, history and news
53. Accelerant
2025 commercial premiums: $1.60 billion (0.33% of the market) · AM Best: A- (Excellent), under review with developing implications since August 2026 (as of 2026-08) · Headquarters: Sandy Springs, Georgia (registered office of the U.S. insurers); parent incorporated in the Cayman Islands · Ownership: Public company (NYSE: ARX) since July 2025, controlled by Altamont Capital Partners; agreed in August 2026 to be taken private by Thoma Bravo, with closing expected in the first half of 2027
A risk exchange whose insurers issue policies for 300-plus specialty MGAs insuring small and mid-sized businesses; a Thoma Bravo buyout is pending. Best suited to: Small and mid-sized businesses whose agent places them in a niche MGA program that runs on Accelerant's paper; you choose the program, not the carrier.
Full Accelerant profile: contacts, ratings, products, history and news
54. New York State Insurance Fund (NYSIF)
2025 commercial premiums: $1.60 billion (0.33% of the market) · Headquarters: New York, New York · Business customer service: 888-875-5790 · Claims: 844-879-2692 · Ownership: Self-supporting nonprofit agency of the State of New York (no shareholders or policyholder-owners)
New York's state agency fund for workers' comp, disability and paid family leave. It competes with private carriers and must take any employer that applies. Strongest national positions: No. 7 in workers' compensation. Best suited to: New York employers that want low-cost statutory workers' comp or DB/PFL coverage, and employers that cannot get comp from a private carrier.
Full New York State Insurance Fund (NYSIF) profile: contacts, ratings, products, history and news
55. Ascot Group
2025 commercial premiums: $1.58 billion (0.33% of the market) · AM Best: A (Excellent) (as of 2025-10) · Headquarters: Pembroke, Bermuda (U.S. operations run from New York City) · Business customer service: 646-356-8101 · Claims: 833-454-3023 · Ownership: Private; majority-owned by Canada Pension Plan Investment Board (CPP Investments) since 2016, with a minority stake held by BellTower Partners since 2024
Bermuda specialty insurer majority-owned by CPP Investments; its U.S. arm writes E&S and excess casualty, professional lines, surety, marine and comp. Best suited to: Mid-sized and larger companies whose broker needs specialty casualty, professional lines, inland marine or surety capacity from an A-rated market.
Full Ascot Group profile: contacts, ratings, products, history and news
56. The Doctors Company
2025 commercial premiums: $1.55 billion (0.32% of the market) · AM Best: A (Excellent) (as of 2025-10) · Headquarters: Napa, California · Business customer service: 800-421-2368 · Claims: 800-421-2368 (option 3) · Ownership: Policyholder-owned reciprocal exchange, managed by its attorney-in-fact, The Doctors Management Company
Physician-owned med mal insurer based in Napa, California, covering doctors, dentists, clinicians and hospitals. It bought ProAssurance in June 2026. Strongest national positions: No. 2 in medical professional liability. Best suited to: Physicians, dentists, advanced practice clinicians, medical groups and hospitals that want malpractice coverage from a physician-owned insurer with consent-to-settle and retirement benefits.
Full The Doctors Company profile: contacts, ratings, products, history and news
57. IAT Insurance Group
2025 commercial premiums: $1.54 billion (0.32% of the market) · AM Best: A- (Excellent) (as of 2025-02) · Headquarters: Raleigh, North Carolina · Business customer service: 800-821-8014 (billing and customer support) · Claims: 866-576-7971 · Ownership: Private; controlled by the Kellogg family through Goose Creek Capital, Inc. and IAT Reinsurance Company Ltd. (Cayman Islands)
Private Raleigh specialty carrier writing trucking and moving insurance, inland marine, E&S casualty and property, surety and management liability via agents. Best suited to: Trucking and moving companies, contractors, and small to mid-sized businesses whose independent agent needs specialty auto, inland marine, E&S or surety capacity.
Full IAT Insurance Group profile: contacts, ratings, products, history and news
58. Coaction Specialty
2025 commercial premiums: $1.51 billion (0.31% of the market) · AM Best: A- (Excellent) (as of 2026-01) · Headquarters: Morristown, New Jersey · Business customer service: 800-774-2755 · Claims: 800-774-2755 · Ownership: Private; owned by private equity firms TowerBrook Capital Partners and Further Global Capital Management since August 2021
New Jersey specialty insurer (formerly ProSight) owned by TowerBrook and Further Global: E&S casualty and property, marine, energy, entertainment and D&O. Best suited to: Small to middle-market businesses with construction, marine, energy, transportation or entertainment exposures whose wholesale or specialty broker needs E&S or package capacity.
Full Coaction Specialty profile: contacts, ratings, products, history and news
59. Clear Blue Insurance Group
2025 commercial premiums: $1.48 billion (0.31% of the market) · AM Best: A- (Excellent) (as of 2023-11) · Headquarters: Charlotte, North Carolina (main office); AM Best lists the group in Guaynabo, Puerto Rico, where it also has an office · Business customer service: 980-299-9520 · Ownership: Private; backed since its 2015 launch by the private equity firm Pine Brook, which added equity in 2023
A fronting carrier group whose four insurers issue policies for MGA programs in trucking, contractors, auto dealers and habitational risks. Best suited to: A business whose agent places it in a specialty MGA program, often trucking, contractors or habitational, that runs on Clear Blue's paper.
Full Clear Blue Insurance Group profile: contacts, ratings, products, history and news
60. Skyward Specialty
2025 commercial premiums: $1.41 billion (0.29% of the market) · AM Best: A (Excellent) (as of 2026-09) · Headquarters: Houston, Texas · Business customer service: 713-935-4800 · Claims: 888-321-0714 · Ownership: Public company (Nasdaq: SKWD); the holding company has used the Skyward Group brand since January 2026
Houston-based specialty insurer writing E&S, surety, professional lines, energy, programs, captives and stop-loss; bought Lloyd's platform Apollo in 2026. Best suited to: Mid-sized and hard-to-place businesses that need E&S liability or property, surety bonds, energy coverage or professional lines through a broker.
Full Skyward Specialty profile: contacts, ratings, products, history and news
61. GNY (Greater New York Mutual)
2025 commercial premiums: $1.36 billion (0.28% of the market) · AM Best: A+ (Superior) (as of 2026-01) · Headquarters: New York, New York · Business customer service: 800-522-5504 · Claims: 212-683-9700 · Ownership: Mutual insurance company (owned by its policyholders)
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. Best suited to: Owners of apartment, co-op, condo, office and retail buildings and of restaurants in the Northeast that want a package policy from a highly rated mutual through their broker.
Full GNY (Greater New York Mutual) profile: contacts, ratings, products, history and news
62. Trisura
2025 commercial premiums: $1.34 billion (0.28% of the market) · AM Best: A- (Excellent) (as of 2026-07) · Headquarters: Oklahoma City, Oklahoma (U.S. operations); parent based in Toronto, Ontario, Canada · Business customer service: 405-583-6100 · Ownership: Public company (TSX: TSU); spun out of Brookfield Asset Management in 2017
Toronto-listed specialty insurer whose Oklahoma City-based U.S. arm issues policies for MGA programs and is building a U.S. surety business. Best suited to: A business placed by its agent in an MGA program running on Trisura paper, or a contractor or developer needing surety bonds from a Treasury-listed surety.
Full Trisura profile: contacts, ratings, products, history and news
63. Fortegra
2025 commercial premiums: $1.33 billion (0.27% of the market) · AM Best: A (Excellent) (as of 2026-08) · Headquarters: Jacksonville, Florida · Claims: 844-758-8210 · Ownership: Wholly owned subsidiary of DB Insurance Co., Ltd. (Korea) since May 29, 2026; previously owned by Tiptree Inc. (Nasdaq: TIPT) and Warburg Pincus
Jacksonville specialty insurer writing E&S and admitted programs through MGAs plus warranty and credit protection; owned by Korea's DB Insurance since May 2026. Best suited to: A business placed by its agent in an MGA program on Fortegra paper, or a lender, dealer or manufacturer that wants warranty or credit protection products for its customers.
Full Fortegra profile: contacts, ratings, products, history and news
64. FCCI Insurance Group
2025 commercial premiums: $1.27 billion (0.26% of the market) · AM Best: A (Excellent) (as of 2026-06) · Headquarters: Sarasota, Florida · Business customer service: 800-226-3224 · Claims: 800-226-3224 · Ownership: Mutual holding company structure (policyholder-owned); FCCI Mutual Insurance Holding Company is the parent
Sarasota-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. Best suited to: Contractors, manufacturers, distributors, farms and other small to middle-market businesses in the Southeast, Gulf Coast, Mid-Atlantic, Midwest and Texas that buy through an independent agent.
Full FCCI Insurance Group profile: contacts, ratings, products, history and news
65. Applied Underwriters
2025 commercial premiums: $1.25 billion (0.26% of the market) · AM Best: A- (Excellent) (as of 2026-08) · Headquarters: Omaha, Nebraska · Business customer service: 877-234-4420 · Claims: 877-234-4420 · Ownership: Privately held; controlled by founder Steve Menzies since buying out Berkshire Hathaway's 81% stake in 2019
Omaha-based, founder-owned insurer known for its EquityComp and SolutionOne comp programs, now writing specialty liability, auto and aviation coverage. Best suited to: Employers and specialty accounts whose broker can explain the program structure, especially for monoline comp, public auto, trucking and aviation risks.
Full Applied Underwriters profile: contacts, ratings, products, history and news
66. TruStage (CUMIS)
2025 commercial premiums: $1.20 billion (0.25% of the market) · AM Best: A (Excellent) (as of 2025-12) · Headquarters: Madison, Wisconsin · Business customer service: 800-637-2676 · Claims: 844-337-5828 · Ownership: Mutual holding company structure; CUNA Mutual Holding Company owns TruStage Financial Group, Inc., parent of CUMIS Insurance Society
The credit union movement's own insurer, formerly CUNA Mutual Group; CUMIS writes bonds, D&O, cyber and property for credit unions plus specialty programs. Strongest national positions: No. 6 in fidelity. Best suited to: Credit unions that want a bond, management liability, cyber and property program written for financial cooperatives by a carrier that insures most of the industry.
Full TruStage (CUMIS) profile: contacts, ratings, products, history and news
67. UFG Insurance
2025 commercial premiums: $1.18 billion (0.24% of the market) · AM Best: A- (Excellent) (as of 2025-08) · Headquarters: Cedar Rapids, Iowa · Business customer service: 800-553-7937 · Claims: 800-343-9131 · Ownership: Public company (Nasdaq: UFCS)
Cedar Rapids, Iowa, commercial insurer founded in 1946, selling packages, auto, comp and surety through about 850 independent agencies; Nasdaq: UFCS. Best suited to: Contractors, manufacturers, real estate owners, distributors and small retail or service businesses that buy a commercial package and bonds through an independent agent.
Full UFG Insurance profile: contacts, ratings, products, history and news
68. Aspen Insurance
2025 commercial premiums: $1.18 billion (0.24% of the market) · AM Best: A+ (Superior) (as of 2026-09) · Headquarters: Hamilton, Bermuda (U.S. operations based in Rocky Hill, Connecticut) · Ownership: Wholly owned by Sompo Holdings through Sompo International Holdings since February 24, 2026; owned by Apollo-managed funds from February 2019 (NYSE-listed again from May 2025)
Bermuda specialty insurer and reinsurer owned by Apollo funds from 2019 and by Sompo since February 2026; known for excess casualty, professional lines and E&S. Best suited to: Mid-sized and large companies whose broker needs excess casualty, environmental, professional or management liability capacity, often on surplus lines paper.
Full Aspen Insurance profile: contacts, ratings, products, history and news
69. ICW Group
2025 commercial premiums: $1.17 billion (0.24% of the market) · AM Best: A (Excellent) (as of 2025-12) · Headquarters: San Diego, California · Business customer service: 844-442-9252 · Claims: 877-442-9669 · Ownership: Privately held
Privately held San Diego insurer known for workers' comp in 22 states and commercial earthquake cover, now adding E&S excess and California commercial lines. Best suited to: Employers with real workers' comp exposure, especially in California and the West, that want in-house claims and loss control, and California property owners shopping for earthquake cover.
Full ICW Group profile: contacts, ratings, products, history and news
70. Church Mutual
2025 commercial premiums: $1.14 billion (0.24% of the market) · AM Best: A (Excellent), negative outlook (as of 2026-04) · Headquarters: Merrill, Wisconsin · Business customer service: 800-554-2642 · Claims: 800-554-2642 · Ownership: Mutual holding company structure since January 1, 2020; policyholders are members of Church Mutual Holding Company, Inc.
Wisconsin specialist that insures more than 50,000 churches plus nonprofits, schools and camps; rated A (Excellent) with a negative outlook since 2024. Best suited to: Churches, ministries, faith-based schools, camps and human services nonprofits that want a carrier built around their exposures, including abuse and volunteer risks.
Full Church Mutual profile: contacts, ratings, products, history and news
71. James River
2025 commercial premiums: $1.13 billion (0.23% of the market) · AM Best: A- (Excellent), negative outlook (as of 2026-03) · Headquarters: Chapel Hill, North Carolina (E&S segment in Richmond, Virginia; Falls Lake in Raleigh, North Carolina) · Business customer service: 804-289-2700 · Ownership: Public company (Nasdaq: JRVR)
Nasdaq-listed E&S casualty writer for small and mid-size accounts, sold only through wholesalers, plus Falls Lake admitted comp; rated A-, negative outlook. Best suited to: Wholesale brokers placing small to mid-size casualty risks, including higher-hazard contractors and manufacturers, that standard carriers decline.
Full James River profile: contacts, ratings, products, history and news
72. Western National
2025 commercial premiums: $1.09 billion (0.22% of the market) · AM Best: A+ (Superior) (as of 2025-11) · Headquarters: Edina, Minnesota · Business customer service: 800-862-6070 · Claims: 855-921-3164 · Ownership: Mutual (policyholder-owned)
Minnesota mutual selling commercial package, auto, comp, niche programs and surety through independent agents in the Upper Midwest, Northwest and Alaska. Best suited to: Small and mid-size businesses in Minnesota, the Upper Midwest, the Northwest and Alaska that buy through a local independent agent, plus contractors needing bonds.
Full Western National profile: contacts, ratings, products, history and news
73. HDI Global
2025 commercial premiums: $1.07 billion (0.22% of the market) · AM Best: A+ (Superior) (as of 2025-12) · Headquarters: Chicago, Illinois (parent HDI Global SE in Hannover, Germany) · Business customer service: 312-580-1900 · Ownership: Subsidiary of HDI Global SE, part of the Talanx Group (Frankfurt: TLX), which is majority-owned by the German mutual HDI V.a.G.
U.S. arm of Germany's Talanx/HDI: broker-placed property, casualty and specialty for mid-size and large companies, rated A+ by AM Best. Best suited to: Mid-size and large companies, often with operations abroad, whose brokers want a German-backed A+ carrier for casualty, property or a specialty niche.
Full HDI Global profile: contacts, ratings, products, history and news
74. Encova Insurance
2025 commercial premiums: $1.04 billion (0.21% of the market) · AM Best: A (Excellent) (as of 2025-10) · Headquarters: Columbus, Ohio · Business customer service: 844-362-6821 · Claims: 844-362-6821 · Ownership: Policyholder-owned; six affiliated mutuals reorganized under a mutual insurance holding company on January 1, 2021
Columbus, Ohio mutual formed from Motorists and BrickStreet; workers' comp in 26 states and D.C. and business packages in 22, sold by independent agents. Best suited to: Small and mid-sized employers in its Midwest, Northeast and Southeast states that want workers' comp and a package policy from one agent-placed mutual.
Full Encova Insurance profile: contacts, ratings, products, history and news
75. Farm Bureau Financial Services
2025 commercial premiums: $1.03 billion (0.21% of the market) · AM Best: A (Excellent) (as of 2026-09) · Headquarters: West Des Moines, Iowa · Business customer service: 800-526-7270 · Claims: 800-226-6383 · Ownership: Policyholder-owned through Farm Bureau Mutual Holding Company; operations managed for a fee by FBL Financial Group, which the Iowa Farm Bureau Federation controls
Iowa-based Farm Bureau insurer and the largest U.S. farmowners writer, selling farm, ranch and small-business coverage in eight states through exclusive agents. Strongest national positions: No. 1 in farmowners. Best suited to: Farms, ranches and small Main Street businesses in its eight states that want one local agent for the farm, the business, the vehicles and the family.
Full Farm Bureau Financial Services profile: contacts, ratings, products, history and news
76. SECURA Insurance
2025 commercial premiums: $1.03 billion (0.21% of the market) · AM Best: A (Excellent) (as of 2026-03) · Headquarters: Neenah, Wisconsin · Business customer service: 800-558-3405 · Claims: 800-318-2136 · Ownership: Policyholder-owned; reorganized under a mutual holding company structure in 2021
Wisconsin mutual founded in 1900 that sells business, nonprofit, special-event and farm insurance in 13 states through independent agents. Best suited to: Small and mid-sized businesses, nonprofits, event organizers and farms in its 13 states that want an agent-placed mutual with specialty programs for their niche.
Full SECURA Insurance profile: contacts, ratings, products, history and news
77. Kemper
2025 commercial premiums: $1.01 billion (0.21% of the market) · AM Best: A- (Excellent) (as of 2026-09) · Headquarters: Chicago, Illinois · Business customer service: 800-722-3391 · Claims: 800-353-6737 · Ownership: Public company (NYSE: KMPR)
Chicago nonstandard auto insurer whose Kemper Auto Commercial unit insures vehicles of contractors and small businesses in eight states via independent agents. Best suited to: Contractors and service businesses in its eight commercial states that run pickups, vans or a small fleet and want price-focused auto coverage through an agent.
Full Kemper profile: contacts, ratings, products, history and news
78. Amerisure
2025 commercial premiums: $984.2 million (0.20% of the market) · AM Best: A (Excellent) (as of 2026-03) · Headquarters: Farmington Hills, Michigan · Business customer service: 800-257-1900 · Claims: 800-257-1900 · Ownership: Policyholder-owned; mutual holding company structure since 2009
Michigan mutual founded in 1912 that insures mid-sized construction, manufacturing and healthcare firms nationwide through select independent agencies. Best suited to: Mid-sized contractors, manufacturers and healthcare facilities that want a specialist mutual for comp, auto and liability, including loss-sensitive plans.
Full Amerisure profile: contacts, ratings, products, history and news
79. State Compensation Insurance Fund (State Fund)
2025 commercial premiums: $962.0 million (0.20% of the market) · Headquarters: Pleasanton, California · Business customer service: 888-782-8338 · Claims: 888-782-8338 (weekdays; online reporting 24/7) · Ownership: Not-for-profit, self-supporting state fund created by the California Legislature (no shareholders), governed by a board appointed by the governor and Legislature
California's not-for-profit state fund, created in 1914. It competes with private carriers for workers' comp and keeps its door open to any California employer. Best suited to: California employers of any size that want workers' comp from a not-for-profit carrier with dividends and safety grants, including accounts private carriers turn away.
80. Texas Mutual
2025 commercial premiums: $941.9 million (0.19% of the market) · AM Best: A+ (Superior) (as of 2025-12) · Headquarters: Austin, Texas · Business customer service: 800-859-5995 · Claims: 800-892-5246 · Ownership: Mutual insurance company owned by its policyholders (converted from the state-created Texas Workers' Compensation Insurance Fund in 2001)
Policyholder-owned workers' comp insurer created by Texas lawmakers in 1991. It leads the Texas comp market and is the state's insurer of last resort. Best suited to: Texas employers of any size that want workers' comp from a policyholder-owned specialist with a long dividend record, bought through a local agent.
Full Texas Mutual profile: contacts, ratings, products, history and news
81. ProAssurance
2025 commercial premiums: $927.0 million (0.19% of the market) · AM Best: A (Excellent) (as of 2025-07) · Headquarters: Birmingham, Alabama · Business customer service: 800-282-6242 · Claims: 877-778-2524 (medical professional liability) · Ownership: Wholly owned subsidiary of The Doctors Company since June 26, 2026; formerly listed on the NYSE as PRA
Birmingham-based medical malpractice, med-tech products and workers' comp insurer, owned by The Doctors Company since June 2026 after a $1.3 billion takeover. Strongest national positions: No. 5 in medical professional liability. Best suited to: Physicians, medical groups, facilities and med-tech companies that want a specialist medical liability carrier now backed by The Doctors Company, and employers seeking workers' comp through Eastern Alliance.
Full ProAssurance profile: contacts, ratings, products, history and news
82. Frankenmuth Insurance
2025 commercial premiums: $920.0 million (0.19% of the market) · AM Best: A (Excellent) (as of 2026-06) · Headquarters: Frankenmuth, Michigan · Business customer service: 800-234-1133 · Claims: 800-234-4433 (24/7) · Ownership: Policyholder-owned mutual holding company structure since January 1, 2023 (operating company formerly Frankenmuth Mutual Insurance Company)
Michigan regional mutual founded in 1868. It sells package, auto, comp and surety coverage for businesses through independent agents in 16 states. Best suited to: Contractors, manufacturers, retailers, distributors, offices and service businesses in its 16 states that want a package or BOP from a regional mutual through a local independent agent.
Full Frankenmuth Insurance profile: contacts, ratings, products, history and news
83. Brotherhood Mutual
2025 commercial premiums: $918.8 million (0.19% of the market) · AM Best: B++ (Good) (as of 2026-07) · Headquarters: Fort Wayne, Indiana · Business customer service: 800-380-5474 · Claims: 800-333-3371 · Ownership: Stock insurer indirectly wholly owned by Brotherhood Mutual Holding Company, a policyholder-owned mutual holding company (since July 1, 2024)
Fort Wayne insurer for churches, Christian schools, colleges, camps and mission groups since 1917. Rated B++ by AM Best after a 2024 downgrade. Best suited to: Churches and Christian ministries that want a package written for ministry exposures, sold by agents who specialize in churches, and that can accept a B++ AM Best rating.
Full Brotherhood Mutual profile: contacts, ratings, products, history and news
84. Palomar
2025 commercial premiums: $890.2 million (0.18% of the market) · AM Best: A (Excellent), stable outlook (Palomar Specialty and Palomar Excess and Surplus; First Indemnity of America A-, positive) (as of 2025-09) · Headquarters: La Jolla (San Diego), California · Business customer service: 619-567-5290 · Claims: 844-560-7401 · Ownership: Public company (Nasdaq: PLMR) since April 2019
La Jolla specialty insurer known for earthquake and DIC property, now growing in contractor casualty, inland marine, surety, crop and fronting. Best suited to: Owners of earthquake-exposed commercial buildings in California and the West, and contractors whose wholesale broker places their casualty or bonds with a specialty market.
Full Palomar profile: contacts, ratings, products, history and news
85. Sutton National
2025 commercial premiums: $877.4 million (0.18% of the market) · AM Best: A- (Excellent), stable outlook (as of 2025-01) · Headquarters: Delray Beach, Florida (insurers domiciled in Oklahoma City, Oklahoma) · Ownership: Private; since November 2024 controlled through upstream and downstream trusts with independent trustees, replacing the earlier link to 777 Partners
A-rated program carrier that issues admitted and surplus lines policies for program administrators and reinsurers; you reach it only through a program. Best suited to: Businesses whose agent places them in a program run by a program administrator on Sutton's paper; the program, not Sutton, sets the coverage and service.
Full Sutton National profile: contacts, ratings, products, history and news
86. Obsidian Insurance
2025 commercial premiums: $866.6 million (0.18% of the market) · AM Best: A- (Excellent), under review with positive implications (as of 2026-04) · Headquarters: New York, New York; insurers domiciled in Delaware (Obsidian Specialty, Obsidian Pacific) and Ohio (Obsidian Insurance Company) · Ownership: Private, controlled by Genstar Capital; agreed on April 28, 2026 to be sold to Protective Life Insurance Company (part of Dai-ichi Life Group), with closing expected in the fourth quarter of 2026 or first quarter of 2027
Genstar-backed hybrid fronting carrier that issues policies for MGA and program administrator programs; Protective Life agreed to buy it in April 2026. Best suited to: Businesses whose agent places them in an MGA program written on Obsidian paper; the program administrator, not Obsidian, sets coverage, pricing and service.
Full Obsidian Insurance profile: contacts, ratings, products, history and news
87. Vantage Risk
2025 commercial premiums: $822.5 million (0.17% of the market) · AM Best: A- (Excellent), positive outlook (as of 2026-06) · Headquarters: Pembroke, Bermuda; U.S. offices in Norwalk and West Hartford (Connecticut), New York, Boston, Chicago, Alpharetta (Georgia) and Washington, D.C. · Ownership: Subsidiary of Howard Hughes Holdings Inc. (NYSE: HHH) since June 4, 2026; previously backed by Carlyle and Hellman & Friedman
Bermuda specialty (re)insurer founded in 2020 that writes U.S. excess casualty, construction, healthcare and large property; owned by Howard Hughes since 2026. Best suited to: Middle-market and large businesses, contractors and healthcare systems whose broker needs specialty casualty, excess or large property capacity from a Bermuda-backed market.
Full Vantage Risk profile: contacts, ratings, products, history and news
88. Accredited
2025 commercial premiums: $781.5 million (0.16% of the market) · AM Best: A- (Excellent), stable outlook; Financial Size Category IX (as of 2025-09) · Headquarters: Orlando, Florida (Accredited America); group operations also in London and Malta · Business customer service: 800-432-2799 · Claims: 888-668-2791 · Ownership: Private, owned by funds managed by Onex Partners since June 28, 2024
Onex-owned program manager whose A- rated insurers issue admitted and surplus lines policies for MGAs in the U.S., UK and Europe; commercial auto leads. Best suited to: Businesses whose agent places them in an MGA program written on Accredited paper, often commercial auto, liability or property programs; the MGA sets coverage and service.
Full Accredited profile: contacts, ratings, products, history and news
89. EMPLOYERS
2025 commercial premiums: $747.5 million (0.15% of the market) · AM Best: A (Excellent), stable outlook (as of 2026-01) · Headquarters: Reno, Nevada · Business customer service: 888-682-6671 · Claims: 888-682-6671 · Ownership: Public company (NYSE: EIG)
Reno-based workers' comp specialist for lower-hazard small businesses, sold through agents and online through its Cerity brand; rated A (Excellent) by AM Best. Best suited to: Small employers in lower-hazard classes such as restaurants, offices, retail and light trades that want a monoline workers' comp specialist, through an agent or online.
Full EMPLOYERS profile: contacts, ratings, products, history and news
90. GuideOne Insurance
2025 commercial premiums: $743.4 million (0.15% of the market) · AM Best: A- (Excellent), negative outlook (as of 2025-03) · Headquarters: West Des Moines, Iowa · Business customer service: 877-448-4331 · Claims: 888-748-4326 · Ownership: Mutual holding company structure since April 1, 2021; policyholders are members of GuideOne Mutual Holding Company
West Des Moines insurer of churches, other religious organizations and human services nonprofits, plus program business; A- (Excellent) with a negative outlook. Best suited to: Churches, faith-based schools and camps, and human services nonprofits that want a specialist package with abuse, D&O and EPL cover, placed through an agent.
Full GuideOne Insurance profile: contacts, ratings, products, history and news
91. SiriusPoint
2025 commercial premiums: $719.5 million (0.15% of the market) · AM Best: A (Excellent), stable outlook (as of 2026-04) · Headquarters: Pembroke, Bermuda (U.S. office in New York, New York) · Business customer service: 212-312-0200 · Ownership: Public company (NYSE: SPNT)
Bermuda specialty insurer and reinsurer whose U.S. business is written mostly through MGAs and program administrators on its admitted and E&S paper. Best suited to: Businesses whose broker places them in a specialist MGA or program, such as a small contractor general liability program, that uses SiriusPoint as the issuing carrier.
Full SiriusPoint profile: contacts, ratings, products, history and news
92. SCOR
2025 commercial premiums: $711.6 million (0.15% of the market) · AM Best: A (Excellent), stable outlook (as of 2026-02) · Headquarters: Paris, France (U.S. P&C operations led from New York) · Ownership: Public company (Euronext Paris: SCR)
French 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. Best suited to: Large companies whose broker wants a highly rated global carrier for specialty or energy risks, and smaller businesses placed through an MGA program that issues GSNIC or GSINDA policies.
Full SCOR profile: contacts, ratings, products, history and news
93. COUNTRY Financial
2025 commercial premiums: $691.8 million (0.14% of the market) · AM Best: A+ (Superior), stable outlook (as of 2026-08) · Headquarters: Bloomington, Illinois · Business customer service: 866-268-6879 · Claims: 866-268-6879 · Ownership: Policyholder-owned mutual (COUNTRY Mutual Insurance Company), affiliated with the Illinois Agricultural Association (Illinois Farm Bureau)
Bloomington, Illinois insurer founded by farmers in 1925; sells farm, small business and workers' comp coverage through its own reps in 19 states. Strongest national positions: No. 7 in farmowners. Best suited to: Farmers, ranchers and main-street small businesses in its 19 states that want one local rep for farm, business, home, auto and life coverage.
Full COUNTRY Financial profile: contacts, ratings, products, history and news
94. Shelter Insurance
2025 commercial premiums: $680.0 million (0.14% of the market) · AM Best: A (Excellent) (as of 2025-11) · Headquarters: Columbia, Missouri · Business customer service: 800-743-5837 · Claims: 800-743-5837 · Ownership: Mutual insurance company owned by its policyholders
Missouri mutual selling auto, home, farm and small business policies through exclusive agents in 14 states; Haulers and AmShield use independent agents. Strongest national positions: No. 9 in burglary and theft. Best suited to: Small businesses, landlords and farm operations in Shelter's 14-state Midwest and South footprint that want to bundle business cover with home and auto through one local agent.
Full Shelter Insurance profile: contacts, ratings, products, history and news
95. MagMutual
2025 commercial premiums: $677.2 million (0.14% of the market) · AM Best: A (Excellent) (as of 2026-10) · Headquarters: Atlanta, Georgia · Business customer service: 800-282-4882 · Claims: 800-282-4882 · Ownership: Policyholder-owned mutual (MAG Mutual Holding Company structure)
Atlanta-based physician-owned mutual that insures doctors, medical groups and hospitals for malpractice; online quoting for physicians, rated A (Excellent). Strongest national positions: No. 4 in medical professional liability. Best suited to: Physicians, medical groups and hospitals that want a policyholder-owned malpractice carrier with dividends, risk advice and an in-house defense team.
Full MagMutual profile: contacts, ratings, products, history and news
96. NJM Insurance Group
2025 commercial premiums: $653.0 million (0.13% of the market) · AM Best: A+ (Superior) (as of 2026-04) · Headquarters: West Trenton (Ewing Township), New Jersey · Business customer service: 800-232-6600 · Claims: 800-367-6564 (business claims other than workers' comp, 24/7); workers' comp claims 800-435-7656 · Ownership: Policyholder-owned mutual
West 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. Best suited to: New Jersey and Mid-Atlantic employers, especially those with sizable payrolls or fleets, that want workers' comp and auto from a policyholder-owned carrier through an independent agent.
Full NJM Insurance Group profile: contacts, ratings, products, history and news
97. Donegal Insurance Group
2025 commercial premiums: $649.1 million (0.13% of the market) · AM Best: A (Excellent) (as of 2025-05) · Headquarters: Marietta, Pennsylvania · Business customer service: 833-908-1606 · Claims: 800-877-9006 (24/7) · Ownership: Donegal Mutual Insurance Company (policyholder-owned) holds majority voting control of Donegal Group Inc., a public company (Nasdaq: DGICA, DGICB)
Pennsylvania regional founded in 1889: a mutual plus its Nasdaq-listed affiliate. It sells BOP, package, auto and comp through independent agents in 21 states. Best suited to: Small and mid-size main-street businesses and artisan contractors in its 21 states that want a BOP, package or auto policy through a local independent agent.
Full Donegal Insurance Group profile: contacts, ratings, products, history and news
98. Mercury Insurance
2025 commercial premiums: $628.2 million (0.13% of the market) · AM Best: A (Excellent) (as of 2026-02) · Headquarters: Brea, California · Business customer service: 800-503-3724 · Claims: 800-503-3724 (24/7) · Ownership: Public company (NYSE: MCY); founder George Joseph is chairman
California auto and home insurer founded in 1961. It writes commercial auto in four states and California BOPs, through independent agents. Best suited to: California small businesses, landlords and apartment owners, and contractors or fleets in California, Texas, Florida and Oklahoma that want commercial auto or a BOP from a large regional personal-lines carrier through a local agent.
Full Mercury Insurance profile: contacts, ratings, products, history and news
99. Hiscox
2025 commercial premiums: $626.0 million (0.13% of the market) · AM Best: A (Excellent) (as of 2025-11) · Headquarters: Hiscox USA in New York, New York; U.S. insurer domiciled in Chicago, Illinois; group headquarters in Hamilton, Bermuda · Business customer service: 866-283-7545 (sales and general questions) · Claims: 866-424-8508 · Ownership: Public company (London Stock Exchange: HSX), headquartered in Bermuda
Lloyd's-rooted specialist that sells professional liability, GL, BOP and cyber to U.S. small businesses online and through brokers, plus E&S lines via Lloyd's. Strongest national positions: No. 7 in burglary and theft. Best suited to: Consultants, tech firms, marketers and other service businesses with few employees that want professional and general liability bought online, and brokers placing professional, media, cyber or specialty E&S risks.
Full Hiscox profile: contacts, ratings, products, history and news
100. American Coastal Insurance
2025 commercial premiums: $612.6 million (0.13% of the market) · Headquarters: St. Petersburg, Florida · Business customer service: 727-633-0851 · Claims: 252-247-8796 (condo and HOA claims, AmRisc); 727-746-9896 (apartment and assisted living claims, Skyway) · Ownership: Public company (Nasdaq: ACIC)
St. Petersburg insurer of Florida condo associations, HOAs, apartment complexes and assisted living facilities, sold only through two MGAs since 2007. Best suited to: Florida condo and homeowners association boards, and owners of garden-style apartment communities or assisted living facilities, that need admitted wind-exposed property coverage through an agent or broker.
Full American Coastal Insurance profile: contacts, ratings, products, history and news
How this ranking was built
The ranking uses direct premiums written in calendar year 2025 from the NAIC's 2025 Market Share Reports for Property/Casualty Groups and Companies (August 2026), for business in the states and U.S. territories. For each insurance group we added its premium in 17 lines that businesses buy: fire, allied lines, farmowners, commercial multiple peril, ocean marine, inland marine, medical professional liability, workers' compensation, excess workers' compensation, other liability, products liability, commercial auto, aircraft, fidelity, surety, burglary and theft, and boiler and machinery. NAIC publishes the top 125 groups in each line, so a group's premium in a line where it falls outside the top 125 is not counted; totals near the bottom of the list are therefore slight underestimates.
Seven groups that would otherwise appear are left out, because a business cannot buy from them in the open market or because what NAIC files under these lines is mostly consumer coverage (personal umbrella, dwelling fire, personal valuables, device protection or travel insurance): USAA, CSAA, the Ohio Bureau of Workers' Compensation (a monopolistic state fund), Florida's Citizens Property Insurance, the Texas FAIR Plan and Texas Windstorm Insurance Association, Assurant and Generali. The next groups in NAIC order take their places.
Groups combine companies under common ownership as filed with the NAIC in August 2025; acquisitions announced or completed since then are described on each profile. Ratings, contacts and descriptions come from each insurer's profile, which lists its sources and the date it was last reviewed.
Rankings by line: the largest workers' comp insurers, the largest commercial auto insurers, the largest commercial liability insurers, the largest commercial package, the largest medical malpractice insurers and the largest surety companies.
Key takeaways
- Travelers, Chubb and Liberty Mutual were the three largest U.S. business insurers by 2025 commercial premiums.
- The top 10 groups wrote 34.6% of commercial premiums in the 17 lines counted; the top 100 wrote 83.7%.
- Large and small carriers differ mainly in appetite and how they sell; size does not tell you price or claims service.
- Check each insurer's dated rating and the subsidiary named on your policy before you rely on a quote.