Top 10 Writers of Medical Professional Liability Insurance By Direct Premiums Written, 2020

($000)

Rank Group/company Direct premiums written (1) Market share (2)
1 Berkshire Hathaway Inc. $1,714,357 16.9%
2 The Doctors Company 962,440 9.5
3 CNA Financial Corp. 609,085 6.0
4 Coverys Insurance Group 522,585 5.2
5 ProAssurance Corp. 436,210 4.3
6 MCIC Vermont 425,006 4.2
7 MagMutual Insurance Co. 368,857 3.6
8 NORCAL Mutual Insurance Co. 359,876 3.6
9 Liberty Mutual 262,878 2.6
10 MMIC Group Inc. 172,709 1.7
(1) Before reinsurance transactions, includes state funds. (2) Based on U.S. total, includes territories. Source: NAIC data, sourced from S&P Global Market Intelligence, Insurance Information Institute.