Berkshire Hathaway is a company mainly engaged in insurance business and has commercial activities in many other fields. The most important business is property and disaster insurance based on direct insurance and reinsurance amount. Berkshire Hathaway has many branches, including GEICO General Reinsurance Company, the sixth largest auto insurance company in the United States, and one of the four largest reinsurance companies in the world.
Berkshire Hathaway has other shareholders. At the annual general meeting of shareholders, shareholders gathered in Buffett's hometown to listen to Warren's investment methods.