About ten national insurers write roughly three-quarters of U.S. private-passenger auto coverage, led by State Farm (18.3% market share), Progressive (15.2%), GEICO’s parent Berkshire Hathaway (12.3%), and Allstate (10.4%), per NAIC data. There is no single cheapest company: in our 10-city quote study, identical driver profiles were quoted annual premiums thousands of dollars apart, so the right company is the one that prices YOUR profile best — compare at least three quotes.
Who are the largest car insurance companies?
The U.S. private-passenger auto market is concentrated at the top: the ten largest writers account for roughly three-quarters of all premiums. These are the companies whose quotes, ads, and agents you will encounter almost everywhere in the country (NAIC data, via the Insurance Information Institute):
| Rank | Company | Direct premiums written (2023) | Market share |
|---|---|---|---|
| 1 | State Farm | $57.97 billion | 18.3% |
| 2 | Progressive | $48.26 billion | 15.2% |
| 3 | Berkshire Hathaway (GEICO) | $38.92 billion | 12.3% |
| 4 | Allstate | $32.85 billion | 10.4% |
| 5 | USAA | $19.81 billion | 6.2% |
| 6 | Liberty Mutual | $13.31 billion | 4.2% |
| 7 | Farmers Insurance Group | $13.22 billion | 4.2% |
| 8 | American Family | $6.79 billion | 2.1% |
| 9 | Travelers | $6.58 billion | 2.1% |
| 10 | Nationwide | $5.41 billion | 1.7% |
Two footnotes worth knowing: GEICO reports under its parent Berkshire Hathaway, and USAA — fifth-largest nationally — only serves military members, veterans, and their families. Size signals financial strength and claims capacity, but it says nothing about which company will quote you the best rate.
How much does car insurance cost in 2026?
The most recent countrywide average auto insurance expenditure published by the NAIC is $1,062 per insured vehicle (2021, the latest available year in the NAIC series) — and premiums have risen substantially since that reading. The national average, though, hides the number that actually matters when choosing a company: the spread between quotes for the same driver.
Our own 10-city quote-spread study found identical driver profiles quoted annual premiums ranging from roughly $2,400 to $7,800 depending on the company and city — a spread wide enough that picking the wrong carrier can cost more per year than a full coverage upgrade. You can see how auto premiums stack against other household costs state-by-state in our multi-state cost comparison.
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How do you choose a car insurance company?
- Decide your coverage first. Pick liability limits, comprehensive/collision, and deductibles before shopping so every quote prices the same thing — our liability coverage and deductible primers cover the terms.
- Get at least three quotes for identical coverage. The quote spread is the single biggest savings lever — companies weigh your age, ZIP, vehicle, and record very differently.
- Check complaint records, not just ads. Every state insurance department publishes complaint data, and the NAIC's company lookup shows complaint ratios versus market share.
- Weigh how you want to be served. State Farm, Allstate, and Farmers sell mainly through local agents; Progressive and GEICO lead direct/online. Neither model is cheaper by rule — but claims day feels different in each.
- Re-shop every renewal. The company that priced you best at 25 with a ding on your record is rarely the one that prices you best at 40 with a clean one.
Are big national insurers better than regional companies?
Not automatically. National carriers bring enormous claims networks, 24/7 apps, and rate stability; strong regional insurers (Erie, Auto-Owners, and state-focused mutuals among them) routinely beat them on price and claims satisfaction inside their footprints. The honest rule: let the top-ten table tell you who can handle a claim anywhere, and let quotes and complaint ratios tell you who deserves yours. If a regional company prices your profile 20 percent under a national brand with a clean complaint record, the smaller name is usually the better buy.
Does the cheapest car insurance company stay the cheapest?
No. Rates are re-filed constantly, and a company aggressively growing in your state this year may take rate increases next year. That churn is why our quote-spread data shows no single company winning across cities — and why the “cheapest company” lists you see ranked nationally rarely survive contact with your own ZIP code. Treat cheapness as a property of the quote, not the brand, and re-shop at renewal.
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Frequently Asked Questions
What is the biggest car insurance company?
State Farm is the largest U.S. private-passenger auto insurer with 18.3 percent market share and $57.97 billion in direct premiums written (2023, NAIC data). Progressive is second at 15.2 percent, followed by GEICO's parent Berkshire Hathaway at 12.3 percent.
Which car insurance company is cheapest?
No single company is cheapest for everyone. Insurers weigh age, ZIP code, vehicle, and driving record differently — our 10-city study found identical profiles quoted from roughly $2,400 to $7,800 a year. The only reliable way to find your cheapest company is comparing at least three quotes for identical coverage.
Who owns GEICO?
GEICO is owned by Berkshire Hathaway, which reports GEICO's auto premiums under the parent company — that is why market-share tables list Berkshire Hathaway third at 12.3 percent rather than GEICO by name.
How many car insurance quotes should I get?
Get at least three quotes for identical coverage limits and deductibles, ideally including one agent-based carrier, one direct writer, and one regional insurer. Quotes are free, and the spread between them is routinely hundreds to thousands of dollars a year.
Can I switch car insurance companies at any time?
Yes. You can switch mid-policy and most insurers refund the unused premium, minus any short-rate fee your policy discloses. Line up the new policy's start date to the old one's cancellation date so coverage never lapses — even a one-day gap can raise future rates.
