Abstract: The article presents a critical review of scientific approaches on the analysis of company’s equity capital, which are available in the scientific literature and business practice. The importance of equity analysis as one of the components of complex diagnostics of a company was emphasized. The paper examines the use of company’s equity parameters as an important indicator of its activity in the domestic business legislation. The basic aspects of a comprehensive equity analysis are amount, structure, ownership, security, cost of equity and efficiency of its exploitation. For each aspect of equity analysis a set of key indicators is elaborated. The amount of statutory capital, as well of company’s reserve fund and its annual replenishment are recognized as key legal parameters of a business. А comprehensive description of the share packages according to the national legislation is given. It is determined, that changes in equity may be caused by profit distribution, inflows from shareholders, flows from operations with own shares, divestitures and adjustments. In the aspect of ownership investigation attention is paid to such parameters as number, structure, type of shareholders as well as their shares and rights they provide. The types of external investors of a company, among them speculator, hedger, portfolio investor, rentier, partner, real owner and state arm and the core objects of their concern are described. A special procedure for calculating the cost of equity, depending on legal form of business, is suggested. Performance analysis of equity exploitation provides calculation of such indexes as return on equity, equity turnover and days equity turnover.