As in the traditional enterprise, the performance of the enterprises in the knowledge based society is expressed through the same well-known financial indicators: return on equity, the profit margin, return on assets, gross margin, asset turnover, inventory turnover, the collection period, days’ sales in cash, payable period, fixed-asset turnover, balance sheet rations, coverage rations, market value leverage rations, liquidity ratios, return on invested capital and many others. But, the differences that appear are in the way of acquiring at this performance in the enterprises. The actual knowledge based society is promoting the methods and models of the rational management that will lead to performance acquiring by the enterprises. Although as a first step, the reference to financial character as income statement, balance sheet, schedules to a balance sheet started to include references to the brain capital that is considered the success key in the businesses. In this paper I intend to present the effects on enterprise’ financial performance of the main components of the brain capital: the human capital characterised through the employees’ competences and skills; organizational capital that defines the internal structures of the enterprises, inclusively the informatics structure and social capital, related to the enterprise relations with thirds (investors, banks, customers, suppliers etc.). The brain capital mustn’t be looked as a present vogue but as a necessity of its consideration and evaluation thus to the old economic-financial rules used in decision making to be added and the knowledge/information decision.
