As one of the most complex industries in the world, this book provides readers with an in-depth coverage of companies that operate in all sectors of the oil & gas industry, that is upstream, midstream and downstream. This book sets out to evaluate companies through upstream, midstream and downstream financial and operational metrics, and to provide an overview of more than 30 companies in different categories, such as national oil companies, international oil companies, independent E&P, pure play refining companies, service companies and royalty trusts. It helps one to understand the different sectors in the oil & gas industry, their business cycles, unique opportunities and challenges.