Is Berkshire Hathaway a hedge fund?
No. Berkshire Hathaway is a publicly traded holding company that owns whole businesses, such as GEICO and the BNSF railroad, along with a large stock portfolio. It files a 13F like any other big investor, which is why its stock picks are followed so closely.
Unlike a hedge fund, Berkshire takes no fees from investors: anyone can buy its shares on the stock exchange, and its managers are paid salaries. Warren Buffett did run a hedge-fund-like partnership before Berkshire, from 1956 to 1969.
HedgeFollow counts Berkshire among its "hedge funds" anyway, because its stock picks are worth following.
Related pages: Famous hedge funds