These are the biggest commercial auto insurance groups based on nationwide premium and market share

Direct Written Premiums: $4.4 billion Market Share: 10.9% 3rd largest auto insurer, #1 in motorcycle/specialty RV. 13M policies/year. Diverse coverage.

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1. Progressive

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Direct Written Premiums: $2.6 billion Market Share: 6.3% Travelers Offers personal, business, specialty insurance through 13,500 agents. Dow Jones exclusive. Comprehensive Commercial Automobile policies.

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2. Travelers

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Direct Written Premiums: $1.8 billion Market Share: 4.4%  Global P&C insurer, 50,000 employees, personal and business solutions, risk control tools.

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3. Liberty Mutual

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Direct Written Premiums: $1.6 billion Market Share: 4.0% Nationwide: Ohio-based insurer, offers various services, including commercial auto and agribusiness insurance.

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4. Nationwide Corp

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Direct Written Premiums: $1.5 billion Market Share: 3.7% Omaha holding company, 60+ subsidiaries, offers commercial auto insurance.

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4. Berkshire Hathaway

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Direct Written Premiums: $1.4 billion Market Share: 3.6% Leading P&C segment, 15 specialty companies, six offer commercial auto coverage.

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6. Old Republic

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Direct Written Premiums: $1.4 billion Market Share: 3.4% Multinational insurer in 210+ countries. Diverse commercial lines, comprehensive automotive solutions with conventional and non-conventional options.

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7. Zurich Insurance

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Direct Written Premiums: $994.9 million Market Share: 2.5% 16th largest US insurer, 40,000 agents in over 6,000 agencies across 26 states, provides comprehensive business, car, farm, home, life insurance coverage.

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8. Auto-Owners

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Direct Written Premiums: $761.7 million Market Share: 1.9% Japanese insurer, covering life, non-life, global sectors, with 245 subsidiaries, 32 affiliates across 483 cities. Established auto insurance in 1914, now 15M policies.

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9. Tokio Marine Group

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Direct Written Premiums: $740.7 billion Market Share: 1.8% World's largest publicly traded P&C insurer, operates in 54 countries. Offers diverse commercial coverages via various channels.

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10. Chubb Ltd

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