The condition for making right investment decisions is possessing reliable and accurate information. In sale and purchase transactions there is a significant asymmetry of information, and the seller always has a significant information advantage over the buyer. In order to minimize the risk related to their potential purchase, investors have developed a series of measures to protect their interests. Due diligence is one of the tools that should be used before making the final investment decision. It should be noted that the higher the investment risk, the more attention should be paid to it.