National Underwriter Property & Casualty recently released its annual list of the top earners in the insurance industry. The list is based on data from S&P Global Market Intelligence, a research and analytics company headquartered in New York City.
The rankings are determined by net premiums written in 2016, and are broken down into several categories, including which companies are leading the way in private auto and commercial auto. Here are the overall top 10 insurance companies, according to National Underwriter:
Top 10 Insurers Ranked by 2016 Net Premiums Written
| Rank | Company | Net Premiums Written 2016 |
| 1 | State Farm Mutual Automobile Ins. | $62,365,585 |
| 2 | Berkshire Hathaway Inc. | $38,782,982 |
| 3 | Allstate Corp. | $29,864,836 |
| 4 | Liberty Mutual | $26,653,251 |
| 5 | Progressive Corp. | $23,357,935 |
| 6 | Travelers Companies Inc. | $23,339,951 |
| 7 | Nationwide Mutual Group | $19,324,954 |
| 8 | USAA Insurance Group | $17,787,459 |
| 9 | American International Group | $16,246,103 |
| 10 | Farmers Insurance Group of Cos. | $14,761,837 |
State Farm Mutual Automobile Ins. remained number one, increasing by 5.1 percent from 2015. American International Group and Farmers both decreased from their reported 2015 net premiums, with American International dropping 13.4 percent and Farmers with a slight 1.1 percent decrease.
As for the private auto sector, the rankings differ slightly compared to the top five groups within the top ten 10 overall.
Top 5 Insurers for Private Auto Ranked by 2016 Net Premiums Written
| Rank | Company | Net Premiums Written 2016 |
| 1 | State Farm Mutual Automobile Ins. | $39,520,531 |
| 2 | Berkshire Hathaway Inc. | $25,496,451 |
| 3 | Allstate Corp. | $20,664,064 |
| 4 | Progressive Corp. | $19,410,311 |
| 5 | USAA Insurance Group | $11,671,180 |
National Underwriter also published the top five insurers for commercial auto net premiums written.
Top 5 Insurers for Commercial Auto Ranked by 2016 Net Premiums Written
| Rank | Company | Net Premiums Written 2016 |
| 1 | Progressive Corp. | $2,511,526 |
| 2 | Travelers Companies Inc. | $2,069,754 |
| 3 | Nationwide Mutual Group | $1,730,583 |
| 4 | Liberty Mutual | $1,627,542 |
| 5 | Berkshire Hathaway Inc. | $956,296 |
