The financial reports are the final product of financial accounting. Their purpose is to provide information to users about financial position, performance and cash flow for the company in a one-year period. Such information is used by external users for economic decision-making on further relations with the company, but this information also enables supervision of the management board. Companys' business results is one of the most important economic categories used to measure business performance. Achieving adequate business results is the most important reason for the existence of the company, whose aim is to make profits and is an important factor in the value of the company and its solvency. When talking about the business results, usually we think about profit or loss in business. The rating of business performance enterprises and solvency of business must be based on the analysis of financial statements for a particular accounting period, primarily the balance sheet and profit and loss account, and if necessary, other financial statements. This paper deals with research and composition of the analysis of the profit and loss account and the overall financial results of the oil company INA for the period from 2010 to 2014. The goal is also to connect theoretical knowledge on financial reporting of large companies and groups with the practical elements of the profit and loss of the oil company INA, in addition to the aforementioned analysis in the preceding period. Actual business results as measured by the growth of competitiveness, production, sales, new products, modernization of production process, new customers and profit, ensure the oil company INA position of a respectable and stable company, not only in Croatia but also in the region.