The main priority objectives of investment development of business entities are singled out. The object of research is financial support for investment activities of business entities. An important problem in the process of investment activity of business entities is the financial provision of business entities, which is aimed at identifying priority areas for economic development of the region. Sources of financial support for investment activities of business entities depend on the economic conditions in which they function and environmental factors that affect both the results of production activities and the formation of investment attractiveness of the region. The sources of financing of capital investments are analyzed, among which the leading positions are taken by the enterprises' own funds that emphasizes the self-financing of enterprises in the process of investment activity. The main sources of financial support for investment activity of business entities are substantiated, namely, the growth of the volume of capital investments by main sources and direct foreign investment in priority spheres of the economy. The influence of environmental factors on the financial provision of investment activity of business entities is revealed, stressing the dependence of their economic growth on the efficiency of attracting and using the natural resource potential. That is why, it is necessary to create conditions for stabilizing the state of environmental protection as the main factor for attracting investments and increasing the investment attractiveness of business entities. The results obtained in the work can be used to study the formation of sources of financial support for investment activities and to study the influence of environmental factors on the formation of the investment attractiveness of the region.