Below you'll find a list of the largest U.S. property and casualty insurers as measured by net premiums written and reported by A.M. Best.
| Ranking | Insurance Company | Net Premiums Written |
|---|---|---|
| 1 | State Farm Group | $50,808,635 |
| 2 | Allstate Insurance Group | $24,796,256 |
| 3 | Liberty Mutual Insurance Cos. | $21,483,996 |
| 4 | Berkshire Hathaway Insurance (includes Geico) | $21,358316 |
| 5 | Travelers Group | $20,594,458 |
| 6 | American International Group | $19,687,720 |
| 7 | Nationwide Group | $14,489,531 |
| 8 | Progressive Insurance Group | $14,476,676 |
| 9 | Farmers Insurance Group | $14,129,512 |
| 10 | USAA Group | $10,679,414 |
| 11 | Hartford Insurance Group | $9,688,760 |
| 12 | Chubb Group of Insurance Cos. | $8,927,736 |
| 13 | CNA Insurance Cos. | $6,188,618 |
| 14 | American Familiy Insurance Group | $5,324, 290 |
| 15 | Aliianz of America | $4,666,301 |
| 16 | Auto-Owners Insurance Group | $4,485,442 |
| 17 | Munich-American Holding Corp. | $4,413,834 |
| 18 | Zurich Finanical Services NA Group | $4,400,123 |
| 19 | Erie Insurance Group | $4,019,273 |
| 20 | Ace INA Group | $3,705,475 |
| 21 | Transatlantic Holdings Inc. Group | $3,408,020 |
| 22 | W.R. Berkley Group | $3,392,330 |
| 23 | The Hanover Insurance Group Property & Casualty Cos. | $3,053,508 |
| 24 | MetLife Auto and Home Group | $2,983,236 |
| 25 | Cincinnati Insurance Cos. | $2,965,462 |
