In this article, we will take a look at 15 of the biggest hedge funds in the USA. If you want to see more of the biggest hedge funds in the USA, go directly to 5 Biggest Hedge Funds in USA. Hedge funds are pooled funds that trade in relatively liquid assets and that can use sophisticated tools to try to improve their performance on a risk adjusted basis. Generally only sophisticated investors such as high net worth individuals and institutions can invest in hedge funds. Different hedge funds have different strategies of investing.