Who Is The Largest Car Insurance Company In The US? 
The largest auto insurance insurer is State Farm , who reported 8.7 billion in premium last year . Berkshire Hathaway -LRB- GEICO -RRB- recently passed Allstate to become the second largest insurer . GEICO reported 4.8 billion , Allstate 4.6 . 4th is Progressive at 3.9 billion . Rounding out the top 5 is Liberty Mutual , who recently barely passed Farmers , both being at 2.5 billion . 