The largest auto insurance companies by market share

The following list is courtesy of A.M. Best. Rankings are based on direct premiums written for private passenger auto insurers.

Rank Insurance company or group Direct premiums written (in 000s) Market share %
1 State Farm Group 30,091,749 18.07
2 Allstate Insurance Group 17,451,279 10.48
3 Berkshire Hathaway Insurance Group 15,346,891 9.22
4 Progressive Insurance Group 13,418,455 8.06
5 Farmers Insurance Group 9,972,084 5.99
6 USAA Group 7,711,413 4.63
7 Liberty Mutual Insurance Companies 7,684,231 4.61
8 Nationwide Group 6,855,293 4.12
9 Travelers Group 3,526,738 2.12
10 American Family Insurance Group 3,042,992 1.83
11 Hartford Insurance Group 2,347,441 1.41
12 Auto Club Enterprises Insurance Group 2,109,907 1.27
13 Mercury General Group 2,068,503 1.24
14 MetLife Personal Lines Group 2,053,503 1.23
15 Erie Insurance Group 1,999,076 1.20
16 California State Auto Group 1,946,792 1.17
17 Auto-Owners Insurance Group 1,632,927 0.98
18 MAPFRE North America Group 1,478,094 0.89
19 Auto Club Group 1,472,315 0.88
20 Kemper P&C Group 1,133,858 0.68
21 Integon National Group 1,120,140 0.67
22 Infinity Property & Casualty Group 1,018,010 0.61
23 Amica Mutual Group 997,953 0.60
24 The Hanover Insurance Grp Prop & Cas Cos 979,427 0.59
25 COUNTRY Financial Property Casualty Grp 973,480 0.58
Source: A.M. Best, based on 2011 premiums
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