Mukesh Dhirubhai Ambani has once again topped the list of richest man in India with a net worth of $38 billion. Mukesh Dhirubhai Ambani (born 19 April 1957) is an Indian business magnate who is the chairman, managing director and largest shareholder of Reliance Industries Limited (RIL), a Fortune Global 500 company and India's most valuable company by market value. He holds a 44.7% stake in the company. RIL deals mainly in refining, petrochemicals, and in the oil and gas sectors. Reliance Retail Ltd., another subsidiary, is the largest retailer in India.