The 25 biggest property/casualty insurers, by direct premiums written and market share, are:

1. State Farm
Direct Premiums Written: $59.361 billion
Market Share: 10.09%

2. Allstate
Direct Premiums Written: $30.18billion
Market Share: 5.13%

3. Berkshire Hathaway
Direct Premiums Written: $29.967 billion
Market Share: 5.09%

4. Liberty Mutual
Direct Premiums Written: $29.848 billion
Market Share: 5.07%

5. Travelers
Direct Premiums Written: $23.2 billion
Market Share: 3.94%

6. Progressive
Direct Premiums Written: $21.346 billion
Market Share: 3.63%

7. Nationwide
Direct Premiums Written: $19.577 billion
Market Share: 3.33%

8. Farmers
Direct Premiums Written: $19.05 billion
Market Share: 3.24%

9. AIG
Direct Premiums Written: $18.997 billion
Market Share: 3.23%

10. USAA
Direct Premiums Written: $16.744 billion
Market Share: 2.85%

11. Zurich
Direct Premiums Written: $11.822 billion
Market Share: 2.01%

12. Hartford
Direct Premiums Written: $11.135 billion
Market Share: 1.89%

13. Chubb Inc.
Direct Premiums Written: $10.468 billion
Market Share: 1.78%

14. Chubb Ltd.
Direct Premiums Written: $10.142 billion
Market Share: 1.72%

15. CNA
Direct Premiums Written: $9.696 billion
Market Share: 1.65%

16. American Family
Direct Premiums Written: $7.242 billion
Market Share: 1.23%

17. Amtrust
Direct Premiums Written: $7.137 billion
Market Share: 1.21%

18. Tokio Marine
Direct Premiums Written: $6.121 billion
Market Share: 1.04%

19. Auto Owners Group
Direct Premiums Written: $5.981 billion
Market Share: 1.02%

20. Erie Insurance
Direct Premiums Written: $5.914 billion
Market Share: 1.01%

21. American Financial
Direct Premiums Written: $5.417 billion
Market Share: 0.92%

22. W.R. Berkley
Direct Premiums Written: $5.376 billion
Market Share: 0.91%

23. Assurant
Direct Premiums Written: $4.974 billion
Market Share: 0.85%

24. QBE
Direct Premiums Written: $4.7 billion
Market Share: 0.8%

25. Cincinnati Financial
Direct Premiums Written: $4.464 billion
Market Share: 0.76%