Facts + Statistics: Commercial Lines

The Commercial Insurance Market

Property/casualty insurance can be broken down into two major categories: commercial lines or types of insurance and personal lines. Personal lines, as the term suggests, includes coverages for individuals—auto and homeowners insurance. Commercial lines, which accounts for about half of U.S. property/casualty insurance industry premium, includes the many kinds of insurance products designed for businesses.

Commercial insurance performs a critical role in the world economy. Without it, the economy could not function. Insurers essentially protect the economic system from failure by assuming the risks inherent in the production of goods and services. For further information on commercial lines see the Commercial Insurance website.

There are over seven million small businesses in the U.S., ranging from construction firms to grocery stores to home-based businesses. All have one thing in common: Without the right insurance coverage, each could be wiped out by a disaster or a lawsuit. In addition, almost all businesses are accountable for the safety of their workers and bear responsibility for injuries suffered on the job. The I.I.I.’s Insuring Your Business website provides information on what coverages businesses should consider as well as what business owners should know about risk management and loss control. (See small business.)

Net Premiums Written, Personal And Commercial Lines, 2020

($ billions)

Source: NAIC data, sourced from S&P Global Market Intelligence, Insurance Information Institute.

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Top 10 Writers Of Commercial Lines Insurance By Direct Premiums Written, 2020


Rank Group/company Direct premiums written (1) Market share (2)
1 Chubb Ltd. $19,399,859 5.5%
2 Travelers Companies Inc. 18,815,626 5.3
3 Liberty Mutual 17,057,397 4.8
4 Zurich Insurance Group 13,358,067 3.8
5 American International Group (AIG) 11,887,670 3.3
6 Berkshire Hathaway Inc. 11,601,352 3.3
7 CNA Financial Corp. 11,302,724 3.2
8 Hartford Financial Services 9,575,425 2.7
9 Nationwide Mutual Group 8,812,305 2.5
10 Tokio Marine Group 7,758,808 2.2

(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.

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