The significance and specificity of the use of stock instruments in the aspect of formation of economic security of economic entities are considered. The interdependence of macroeconomic state regulation of the business environment as the main prerequisite for eliminating economic threats through the formation of effective competition and economic freedoms is determined. Emphasis is placed on the characteristics of investment security, as the initial component of the principles of business security in general, and an indicator of the importance of strategic management intentions. The importance of financial instruments and the state of the stock market in terms of ensuring the stability of business processes in the relevant economic environment, as well as current problems of stock market efficiency, in particular the investment potential of issuers, imperfections of existing stock mechanisms, shortcomings of related areas. The potential of involving separate stock instruments in the formation of economic security of economic entities - institutions of joint capacity investment is substantiated. The key characteristics of mutual investment institutions, specific features of their functioning and features of ensuring the protection of management with their involvement are given. The main strategic directions of economic security formation of business entities are presented, such as prevention of raider attacks, protection against undue pressure from fiscal authorities, management of real estate rent and cash. The effectiveness of the organizational, economic and legal mechanism of functioning of mutual investment institutions in counteracting a number of threats and dangers of the subjective nature of the current business environment is determined. The dynamics of development of mutual investment institutions in Ukraine is studied, the conclusion on expediency and prospects of application of this fund instrument both for development of activity of subjects of managing, and for protection of economic interests and prevention of a number of potential threats is made.