During 2021, commercial auto insurance racked up more than $52 billion in direct premiums written, and some $50 billion in direct premium earned, according to data from the National Association of Insurance Commissioners (NAIC). Overall, commercial insurance prices were up more than 7% during the final quarter of 2021, according to Willis Towers Watson, which reported nearly all commercial lines saw significant price increases during the period. "The aggregate price increases continue to be strong in the fourth quarter, though for some lines the price increases have tempered to a level similar to 2019," Yi Jing, director, insurance consulting and technology, WTW, said in a release. The above slideshow highlights the top 10 commercial auto insurance companies based on 2021 market share, according to NAIC data, while the below list reveals the companies that ranked 11-25.

11. Chubb

Direct premiums written in 2021: $1.03 billion Direct premiums earned in 2021: $1.00 billion Market share: 1.94%  

12. The Hartford

Direct premiums written in 2021: $911 million Direct premiums earned in 2021: $843 million Market share: 1.71%  

13. AIG

Direct premiums written in 2021: $899 million Direct premiums earned in 2021: $864 million Market share: 1.69%  

14. American Financial

Direct premiums written in 2021: $880 million Direct premiums earned in 2021: $847 million Market share: 1.65%  

15. State Farm

Direct premiums written in 2021: $834 million Direct premiums earned in 2021: $776 million Market share: 1.57%  

16. Cincinnati Financial

Direct premiums written in 2021: $813 million Direct premiums earned in 2021: $792 million Market share: 1.53%  

17. Farmers Insurance

Direct premiums written in 2021: $806 million Direct premiums earned in 2021: $757 million Market share: 1.51%  

18. Tokio Marine Holdings Inc.

Direct premiums written in 2021: $805 million Direct premiums earned in 2021: $785 million Market share: 1.51%  

19. Selective Insurance

Direct premiums written in 2021: $791 million Direct premiums earned in 2021: $746 million Market share: 1.49%  

20. Sentry Insurance

Direct premiums written in 2021: $785 million Direct premiums earned in 2021: $726 million Market share: 1.47%  

21. Erie Insurance

Direct premiums written in 2021: $726 million Direct premiums earned in 2021: $707 million Market share: 1.36%  

22. Markel Corp.

Direct premiums written in 2021: $698 million Direct premiums earned in 2021: $683 million Market share: 1.31%  

23. Fairfax Financial

Direct premiums written in 2021: $689 million Direct premiums earned in 2021: $651 million Market share: 1.31%  

24. Acuity

Direct premiums written in 2021: $680 million Direct premiums earned in 2021: $640 million Market share: 1.28%  

25. CNA Insurance

Direct premiums written in 2021: $634 million Direct premiums earned in 2021: $615 million Market share: 1.28% Related:

• These 6 trends are continually driving commercial auto rates up
• Social inflation is a major driver of commercial auto costs
• U.S. personal auto insurance underwriting results dove in 2021