Chubb is a global property and casualty insurer that sells commercial and personal insurance, including coverage favored by higher-income individuals and mid-to-large businesses that value broader coverage over the cheapest available premium. The company underwrites in more than 50 countries, giving it geographic diversification that helps smooth out the impact of any single region's natural catastrophes or economic downturn. Insurance profitability depends on collecting more in premiums than is eventually paid out in claims and expenses, a relationship insurers track through the combined ratio, and Chubb has built a reputation for disciplined underwriting that prioritizes that ratio over simply growing premium volume. Its investment portfolio, funded by the premiums collected before claims are paid, also generates meaningful income that moves with prevailing interest rates.