 The authors proposed an instrumental apparatus for calculating the ratings of Russian companies in the oil and gas and electric power industries. This apparatus was based on a waiting method, risk assessment using the minimax criterion, and an intellectual tree structure. It was designed to provide accurate ratings of these companies based on their current financial performance. Additionally, the authors addressed the issue of data redundancy by using the hierarchical principle for isolating and correcting for changes in the financial statements of the companies. Finally, they developed and tested a methodology for subindexing important indicators of financial statements such as capital structure, equity, debt capital, highly liquid assets, and net profit. This article was authored by Alex Borodin, Irina Vygokakova, Galina Panadova, and others.