Generally you reinsure yourself with other insurance companies, so that if you get more than a certain amount of loss in a single year, other insurance companie

Generally you reinsure yourself with other insurance companies, so that if you get more than a certain amount of loss in a single year, other insurance companies cover the extra. This risk can be spread between several reinsurance providers, taking a percentage each. Lloyds of London is a marketplace where a lot of insurance companies reinsure with each other, or with "syndicates" which are groups of investors.