The aim of this study is to present Investment Functions in Banking. The primary function of the most banks is not to buy and sell bonds, but rather to make loans to business and individuals. Yet buying and selling bonds has its place because not all of a financial institution’s funds can be allocated to loans. Investment Functions typically include government bonds and notes; corporate bonds, notes, and commercial paper; assets backed securities; domestic and Eurocurrency deposits; and certain kind of common and preferred stock.