Reinsurance

Reinsurance is, put simply, insurance for insurance companies. When an insurer issues a policy, it keeps a portion of that risk on its own books and cedes the rest to a reinsurer in exchange for a share of the premium. This spreads large or correlated losses across the global capital markets so that no single hailstorm, hurricane, or liability verdict can threaten the primary carrier's solvency. Regulators and rating agencies watch a carrier's reinsurance program closely because it directly affects how much business the company can safely write relative to its surplus.

Small-business buyers rarely purchase reinsurance directly, but it quietly shapes the coverage they can buy. Reinsurance capacity is why an insurer can offer a high aggregate limit or an umbrella on a risk far larger than its own balance sheet. When reinsurance costs spike after a bad catastrophe year, those increases flow downstream into higher primary rates and tighter underwriting — a dynamic often called a 'hard market.' Understanding this helps a buyer see why premiums for property or liability can jump even when their own loss history is clean.

A practical nuance is the distinction between the two main structures: facultative reinsurance, negotiated one risk at a time, and treaty reinsurance, which automatically covers an entire class of policies. Reinsurance also comes in proportional forms (the reinsurer shares premium and losses by a fixed percentage) and non-proportional or excess-of-loss forms (the reinsurer pays only above an attachment point). Because it is a wholesale transaction between sophisticated parties, reinsurance is largely unregulated at the policy level, yet it is one of the most important stabilizers of the entire insurance system.