Direct Answer
33 SEC filers are classified under the Standard Industrial Classification code that describes the auto insurance industry, and their latest annual reports show $694.8 billion of combined revenue and a median operating margin of 13.6%. Investors should still evaluate its revenue model, industry-specific KPIs, valuation framework and the risks that can change the group's economics.
Industry Overview
Auto insurers sell coverage for liability and vehicle damage and earn premiums minus claims and expenses plus investment income. Repair cost inflation, accident frequency and pricing sufficiency drive the combined ratio. The first numbers to compare across companies here are combined ratio, premium growth and policies in force and loss cost trend.
Key Industry Metrics
- Combined ratio: Claims plus expenses as a share of premiums earned. Readings under the breakeven level indicate an underwriting profit, and above it a loss.
- Premium growth and policies in force: Increase in premiums and active contracts. Growth is healthy only if rates are adequate, since fast expansion can come from underpricing.
- Loss cost trend: Change in the average cost of claims, driven by repair costs, parts and medical bills. If it outpaces price increases, margins shrink.
- Retention: Share of customers who renew. High retention lowers acquisition costs, but rate increases can push shoppers to rivals.
- Reserve development: Changes in earlier estimates of claims owed. Favorable development adds to profit, and adverse development shows past underpricing.
Primary Macro Drivers
- Repair and medical cost inflation: Costs of parts, labor and medical care raise average claim size, so inflation pushes up the combined ratio unless premiums rise faster.
- Miles driven and accident frequency: More driving and busier roads raise accident counts, so miles driven affect claim frequency and loss cost trend.
- Rate increases and regulatory approval: Premiums must be approved in many states, so how quickly increases are filed and approved decides if prices catch up with costs.
- Investment yields: Insurers invest premium float, so higher bond yields add investment income that supports results alongside underwriting.
Major Risks
- Claims inflation outrunning rates: If costs rise faster than rate increases, underwriting margin shrinks. Watch loss cost trend, rate change and combined ratio.
- Regulatory rate limits: Regulators can limit or delay rate increases, so prices lag costs. Watch rate filings and the gap between filed rates and loss trend.
- Catastrophe and litigation costs: Large court awards and legal costs increase severity beyond what was expected. Watch reserve development and litigation commentary.
- Competition for customers: Shoppers switch easily and rivals compete on price and advertising, which affects retention and policies in force. Watch retention and premium growth.
Industry Characteristics
| Characteristic | Profile |
|---|---|
| Cyclicality | Defensive |
| Capital Intensity | High |
| Regulatory Intensity | High |
| Industry Maturity | Mature |
| Geographic Importance | U.S. |
Auto Insurance Filers in the SEC Record
33 companies with annual reports in the dataset are classified by the SEC in the Standard Industrial Classification code 6331. Their latest fiscal years end in 2025, and together they reported $694.8 billion of revenue. Median revenue growth over the prior year was 6.3%. Median operating margin was 13.6% and median net margin 12.9%. Median total liabilities were 75% of total assets, and 30 of 33 reported a profit in their latest year.
| Company | Revenue | Growth | Operating margin | Net margin | Year |
|---|---|---|---|---|---|
| Berkshire Hathaway Inc | $371.4 billion | 0.0% | n/a | 18.0% | FY 2025 |
| Allstate Corp | $67.7 billion | 5.6% | n/a | 15.0% | FY 2025 |
| Travelers Companies, Inc. | $48.8 billion | 5.2% | n/a | 12.9% | FY 2025 |
| Hartford Insurance Group, Inc. | $28.4 billion | 6.9% | n/a | 13.5% | FY 2025 |
| American International Group, Inc. | $26.8 billion | -1.7% | n/a | 11.6% | FY 2025 |
| Arch Capital Group Ltd. | $19.9 billion | 14.3% | n/a | 22.1% | FY 2025 |
| Loews Corp | $18.5 billion | 5.4% | n/a | 9.0% | FY 2025 |
| Everest Group, Ltd. | $17.5 billion | 1.2% | n/a | 9.1% | FY 2025 |
The 8 largest of 33 by revenue. Source: each company's own annual report as filed with the SEC (XBRL data), figures in U.S. dollars. A company's SIC code reflects its main business as the SEC records it, so it can differ from how an index provider or analyst classifies the company, and a diversified group appears under only one code.
Where to Go Next
The Auto Insurance guide describes how the industry earns money, what to measure and what can go wrong. To see how it compares, read the neighbouring industries in the same sector, then apply the same checks to a specific company.
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Frequently Asked Questions
What are the main KPIs for the Auto Insurance industry?
Key performance indicators for the Auto Insurance industry include: Combined ratio, Premium growth and policies in force, Loss cost trend, Retention, Reserve development. Which matter most depends on the company's model, so compare them across several companies rather than relying on one.
How cyclical is the Auto Insurance industry?
The Auto Insurance industry is generally defensive, meaning demand tends to remain relatively stable regardless of the economic cycle. Companies in this space can provide portfolio stability during recessions, though growth may lag in strong expansions.
What are the biggest risks in the Auto Insurance industry?
The primary risks for Auto Insurance companies include: Claims inflation outrunning rates, Regulatory rate limits, Catastrophe and litigation costs, Competition for customers. Investors should assess each company's exposure to these factors and its track record of navigating them.