In the presented clause analyzes fiduciary principles which allow to soften the conflict of interests between organs of government and shareholders of the company. The author considers the institute of fiducia as one of methods of the decision of an agency problem or a problem «principal-agent». Imposing of fiduciary duties on a management (management, board of directors) allows to estimate the contribution of body of government to result of activity of the company to identify wrongful acts of management (reception of personal rents, fulfillment of obviously unprofitable transactions).