This research aims to identify the role of ecosystems in the modern financial world. Banks are most actively involved in the formation of ecosystems, concentrating various offers around their traditional areas of activity. The study of ecosystem strategies used by banks revealed the areas that banks consider as the main ones when forming their own ecosystems. The reasons that caused an active interest in the formation of ecosystems by banks are studied. The analysis of the leading financial ecosystems of countries, including the Russian Federation, is made. The main models of banking ecosystems on the market and their features are shown. Factors that have a stimulating effect on the development of ecosystems are identified. Based on this information, General summary conclusions are formulated.