The United States is by far the largest insurance market in the world. Before you compare quotes or companies, it helps to understand how the market is organized: which segments exist, how large they are, who leads them and who supervises insurers. This overview uses the latest public data from the National Association of Insurance Commissioners (NAIC), the Swiss Re Institute and the Insurance Information Institute (Triple-I).
How big is the US market?
According to the Swiss Re Institute's sigma study No. 2/2025, US insurers collected about $3,497 billion in premiums in 2024, or 44.8% of the global total of about $7,799 billion. China, the second-largest market, accounted for 10.2%.
The NAIC's industry snapshots for the year ended December 31, 2025, break the domestic figures down by type of insurer:
| Segment (NAIC filers) | 2025 | 2024 | What it includes |
|---|---|---|---|
| Property/casualty, net premiums written | $976.8 billion | $938.7 billion | Auto, homeowners, commercial property, liability, workers' compensation |
| Life/accident & health insurers, direct written premium | $1.51 trillion | $1.43 trillion | Life insurance, annuities ($545.4 billion in 2025), A&H written by life companies |
| Health entities, direct written premium | $1.37 trillion | $1.19 trillion | Health plans and HMOs that file with the NAIC |
The three rows use different measures (net vs. direct premium, with or without annuity considerations), so they should not simply be added up. Each, however, is very large by world standards.
Property/casualty vs. life and health
Property/casualty (P&C) insurers protect things and legal liability: cars, homes, businesses, ships and cargo, and the obligation to compensate others. Policies are usually short (six or twelve months) and repriced at each renewal. Personal auto is the single biggest line: NAIC market share data for 2024 put personal auto direct premiums at about $344.1 billion, roughly 35% of all P&C premiums. See our guides to auto insurance and homeowners insurance.
Life and annuity insurers manage long-term promises: death benefits, retirement income and savings products. Annuities have become the dominant source of new money for these companies. See life insurance and annuities.
Health coverage is written both by health plans and by life/health insurers, and it is shaped heavily by federal programs and the Affordable Care Act. See health insurance.
Who are the main players?
The market is large but fairly concentrated at the top. NAIC data for 2024 show the ten largest P&C companies held a cumulative 51.4% market share, and the ten largest life insurers 47.2%. Triple-I's ranking of 2025 direct premiums written lists these leaders:
| Rank | Property/casualty group | Share | Life/annuity group | Share |
|---|---|---|---|---|
| 1 | State Farm | 10.5% | MetLife | 9.3% |
| 2 | Progressive | 7.7% | Equitable Holdings | 7.7% |
| 3 | Berkshire Hathaway | 5.8% | New York Life | 6.2% |
| 4 | Allstate | 5.4% | Athene Holding | 4.4% |
| 5 | Travelers | 3.9% | Prudential Financial | 3.9% |
Below the leaders sit hundreds of regional mutuals, farm bureau companies and specialty carriers. Many of them combine strong financial ratings with personal service; see our overview of leading US insurance companies. You can open company profiles such as State Farm or MetLife in our directory.
How the market is regulated
Insurance in the US is regulated mainly by the states, not by Washington. The McCarran-Ferguson Act of 1945 preserves the states' primary role in regulating and taxing the business of insurance unless Congress explicitly decides otherwise. Each state has an insurance department that licenses insurers and producers, reviews policy forms and rates, monitors solvency and handles consumer complaints.
The NAIC, founded in 1871, is the standard-setting organization governed by the chief insurance regulators of the 50 states, the District of Columbia and five US territories. It develops model laws, collects financial data and coordinates the supervision of multistate insurers. At the federal level, the Federal Insurance Office, created under Title V of the Dodd-Frank Act, monitors the sector and represents the US internationally, but it does not replace state regulators. Because rules differ by state, minimum auto limits, rate approval and consumer protections depend on where you live.
Financial condition in 2025
The NAIC snapshot shows a strong year for P&C insurers: the combined ratio improved to 92.9% in 2025 from 96.9% in 2024, meaning companies paid out less in claims and expenses than they earned in premiums. Policyholders' surplus, the P&C capital cushion, reached about $1.27 trillion. Life/A&H insurers reported capital and surplus of about $539.5 billion. Health entities were less profitable, with a combined ratio of 100.6%. Our article on the combined ratio explains these numbers in detail.
The industry is also a major employer: Triple-I, citing Bureau of Labor Statistics data, reports about 3.0 million people working in insurance in 2025 (preliminary).
What this means for you
- Your options and legal requirements depend on your state, so always check what applies where the risk is located.
- Large national brands and smaller regional carriers both deserve a look; size alone does not tell you about service or price.
- Check an insurer's license, financial strength and complaint record before you buy (see how to check insurer reliability).
Polis Re helps you compare coverage and companies. Policies are issued by licensed insurers and placed through licensed producers in your state. Request a quote or call +1 929 207 0015.