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NAIC 2025 Market Share Report | Top 25 Medical Professional Liability Insurers

March 31, 2025 by AC Editor


The National Association of Insurance Commissioners has issued its annual Market Share Data Reports for both the Property & Casualty Insurance Marketplace, as well as for the Life & Fraternal Insurance Marketplace. As in past iterations, the data offered here reflects a compiled list of market share data based upon filings of countrywide premium submitted to the NAIC from Property & Casualty insurers as reported on the State Page of the NAIC’s annual statement for insurers.

Once collected, the data is compiled into a report listing the cumulative market share data for the seven major lines of insurance in the United States: All lines; Private Passenger Personal Auto; Commercial Auto; Workers’ Compensation; Medical Professional Liability; Homeowners’ Multi-Peril; and Other Liability (excluding auto liability).

With approximately 97.92% of P&C insurers reporting, the industry recorded approximately $1.06 trillion in Direct Premiums Written in 2024. The top 10 P&C insurers account for 51.40% of the total market share, reflecting a continued concentration of market share among the largest carriers.

Private passenger auto insurance remains the dominant line of business, with $344.11 billion in direct premiums written, representing approximately 35% of all reported P&C premiums.

Key takeaways from this year’s Medical Professional Liability Market Share Report

The following are three key takeaways from this year’s market share reports courtesy of Chat GPT:

1. Berkshire Hathaway Dominates with Nearly 18% Market Share

Berkshire Hathaway Group led the sector with $2.2 billion in direct premiums written, representing 17.72% of the total market. Its dominant share is more than 70% higher than its closest competitor, the Doctors Company Group.

2. Market Share is Highly Concentrated Among Top Carriers

The top five groups alone account for over 44% of the total U.S. medical professional liability insurance market. This includes Berkshire Hathaway, Doctors Co, CNA, ProAssurance, and MAG Mutual.

3. Premium Growth Remains Concentrated Despite a Fragmented Tail

After the top 10 groups, market share drops below 2% per group. The 25th-ranked company, MICA Group, holds just 0.73% of market share, illustrating how competitive dynamics shift beyond the top tier and how smaller mutuals, RRGs, and specialty writers continue to operate in regional or niche spaces.


The Top 25 P&C Insurers by Countrywide Premium – Medical Professional Liability Insurers

RankGroup/Company NameDirect Premiums WrittenDirect Premiums EarnedDirect Loss to EP Ratio (%)Market Share (%)Cumulative Market Share (%)
Top Insurer in the US, Insurance News Massachusetts and US Market Share1BERKSHIRE HATHAWAY GRP2,213,998,8442,180,963,41849.0017.7217.72
2DOCTORS CO GRP1,267,764,1641,233,116,52144.3510.1427.86
Top Insurer in the US, Insurance News Massachusetts and US Market Share3CNA INS GRP757,207,091726,112,02736.256.0633.92
4PROASSURANCE CORP GRP679,670,466687,649,92145.185.4439.36
5MAG MUT INS GRP599,176,531598,415,39752.834.7944.15
6COVERYS GRP476,478,279492,690,77554.363.8147.96
Top Insurer in the US, Insurance News Massachusetts and US Market Share7LIBERTY MUT GRP454,792,147413,955,83045.943.6451.60
8MCIC VT A RECIP RRG449,756,768449,759,650105.263.6055.20
9CURI HOLDINGS GRP411,919,973398,233,70853.443.3058.50
Agency Checklists, MA Insurance News, Mass. Insurance News, Chubb, Mass. insurance companies10CHUBB LTD GRP241,822,724232,631,44470.491.9460.43
11ISMIE GRP217,119,087213,398,93346.471.7462.17
Top Insurer in the US, Insurance News Massachusetts and US Market Share12WR BERKLEY CORP GRP199,690,592205,688,39953.521.6063.77
13COPIC GRP192,510,138187,465,58844.961.5465.31
14PRI GRP186,934,534178,353,50354.891.5066.81
Top Insurer in the US, Insurance News Massachusetts and US Market Share15FAIRFAX FIN GRP175,909,998162,239,84648.771.4168.21
16STATE VOLUNTEER MUT INS CO153,038,003150,757,20442.441.2269.44
17PHYSICIANS INS A MUT GRP149,167,486146,220,12756.841.1970.63
18CORE SPECIALTY INS HOLDINGS120,537,71186,191,614124.360.9671.60
Insurance News Massachusetts and US Market Share19NATIONAL GRP113,065,904109,623,75439.970.9072.50
20MARKEL GRP104,382,434101,897,02738.580.8473.34
Top Insurers in the United States21ARCH INS GRP103,876,206100,388,23237.680.8374.17
22NCMIC GRP98,467,19698,599,76131.380.7974.95
23MOUNTAIN LAUREL RRG INC92,926,00080,795,00062.690.7475.70
24MUNICH RE GRP92,625,166103,316,15869.470.7476.44
25MICA GRP91,402,56193,179,51944.170.7377.17
INDUSTRY TOTAL12,497,284,96212,200,800,23052.86100.00100.00

Past NAIC Market Share Reports

For those interested in revisiting or comparing this year’s data with the NAIC Market Share Reports from past years, links to each of those reports are below:

Links to our 2025 NAIC Market Share Reports

  • NAIC 2025 Market Share Report | Top 25 P&C Insurers
  • NAIC 2025 Market Share Report | Top 25 Auto Insurers
  • NAIC 2025 Market Share Report | Top 25 Homeowners’ Insurers
  • NAIC 2025 Market Share | Top 25 Workers’ Compensation Insurers
  • NAIC 2025 Market Share | Top 25 Other Liability Insurers

Links to our 2024 NAIC Market Share Reports

  • NAIC 2024 Market Share Report | Top 25 U.S. P&C Insurers
  • NAIC 2024 Market Share Report | Top 25 Private Passenger Auto Insurers
  • NAIC 2024 Market Share Report | Top 25 Commercial Auto Insurers
  • NAIC 2024 Market Share Report | Top 25 Homeowners Multiple Peril Insurers
  • NAIC Market Share Report 2024 | Top 25 Workers’ Compensation Insurers
  • NAIC 2024 Market Share Report | Top 25 Other Liability Insurers
  • The Top 25 Life Insurance Companies in the U.S.

Links to our 2023 NAIC Market Share Reports

  • NAIC 2023 Market Share Report | Top 25 U.S. Commercial Auto Insurers
  • NAIC 2023 Market Share Report | Top 25 U.S. Auto Insurers
  • NAIC 2023 Market Share Report | Top 25 U.S. Homeowners Multiple Peril Insurers
  • NAIC 2023 Market Share Report | Top 25 U.S. Medical Professional Liability Insurers
  • NAIC 2023 Market Share Report | Top 25 U.S. Other Liability Insurers
  • NAIC 2023 Market Share Report | Top 25 U.S. Workers’ Compensation Insurers

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