If taking risks with investing is up your street, the following five funds are what you should consider. They will post very high returns, but also run the risk of falling sharply when the stock markets move adversely. Investments by these funds are mostly into mid and small-cap companies, which have the potential to become the big companies in future. Do track the performance of these funds closely, because they do take tactical calls based on market and economic developments which impact their performance immensely.