US segment where risks judged too specific or too volatile for the admitted market are placed with surplus lines insurers that are non-admitted but still supervised.
The excess & surplus lines market, or E&S, is the US segment of non-admitted insurance: risks that admitted insurers in a given state decline or misprice, for lack of sufficient data or because of excessive volatility, are placed with surplus lines insurers, which hold no license in the insured's state but remain supervised by their home state and appear on a whitelist (National Association of Insurance Commissioners) authorizing their cross-border activity. This market grew durably after Hurricane Andrew in 1992, whose admitted-insurer failures had reduced available property capacity in exposed areas, a pattern repeated at every subsequent hardening: rising natural catastrophes, admitted insurers withdrawing from California and Florida, or sectors judged too risky such as cyber around the turn of the 2020s. According to A.M. Best data, US E&S premium crossed $75 billion in 2022, driven by catastrophe-exposed property risk and professional liability, confirming a segment that is no longer residual but has become a structural safety valve of the US market.
After several major admitted insurers withdraw from the California homeowners market exposed to wildfire, affected homeowners turn to excess & surplus lines insurers, which accept the risk at higher premiums.
E&S, lignes excédentaires, assurance non admise américaine, surplus lines