Business angels appear as an alternative source of financing for companies in the seed, start-up and early stage of development. In this way, they fill the equity gap that occurs between the entrepreneurs own resources, families and friends on the one hand and the funds of venture capital and bank loans on the other. Because of the tendency of business angels to maintain their anonymity and the lack of obligation to register their investments, 90% of their investments are implemented on the invisible market segment of business angels. As a consequence of the stated importance of the invisible market of business angels, there are problems in identifying indicators of market development of business angels in different countries. By comparing data on the basis of available information on investments of business angels in Europe and the US, it can be concluded that the American market of business angels is far more developed than the Europe's The positive side of the market of business angels in Europe is that it records growth . The similarity between the investments of business angels in Europe and the United States can be found in the fact that the funds are invested in similar industries, primarily in the software industry, biotechnology and medical technology.