Quantum funds invest in commodities, foreign exchange, stocks and bonds, and make extensive use of financial derivatives and leveraged financing to engage in all-round international financial operations. With Soros's extraordinary analytical ability and courage, highly leveraged financing and investment in highly leveraged financial products have achieved high return on investment in a short time. This is not comparable to the S&P index, which is a stock index, while the quantum fund only partially invests in stocks, mainly investing in financial derivatives.

Standard & Poor's Index is the average price of 500 listed industrial, railway and public utilities common stocks compiled and published by Standard & Poor's Company, the largest securities research institution in the United States. It is somewhat similar to the Shanghai and Shenzhen 300 Index in China.