Mukesh Ambani is personally worth $20 billion. He holds a majority controlling share in Reliance Industries Limited (RIL), a company with a market capitalisation of $47 billion and global business interests that include petrochemicals, oil, natural gas, polyester fibre, Special Economic Zones, fresh food retail, high schools, life sciences research and stem cell storage services. RIL is one of a handful of corporations that run India. Some of the others are the Tatas, Jindals, Vedanta, Mittals, Infosys, Essar and the other Reliance (ADAG), owned by Mukesh’s brother Anil.
See http://www.outlookindia.com/article.aspx?280234#.T3Nq10HdOO5.email.