He joined Reliance in 1983 as a co-chief executive officer and before the split in Reliance group; he was Vice-Chairman and Managing Director in Reliance Industries Limited (RIL). After the split of Reliance he incorporated Anil Dhirubhai Ambani Group (ADAG), of which he is the Chairman and includes companies like Reliance Communication, Reliance Capital, Reliance Energy, Reliance Natural Resources Ltd. He is a man of courage and conviction; he believed; "It is hope in this wider sense which enabled my father to build, from scratch, one of India's largest modern enterprises. His was an undertaking powered by hard work, initiative, self-belief but, above all else, the capacity, as he would often say, "to dream with your eyes wide open".
He is the President of the Dhirubhai Ambani Institute of Information and Communication Technology, Gandhinagar; and a member of Wharton Board of Overseers; The Wharton School, USA; Board of Governors, Indian Institute of Management (IIM), Ahmedabad; Board of Governors, Indian Institute of Technology (IIT), Kanpur; Executive Board, Indian School of Business (ISB), Hyderabad.
He raised $ 3 billion from the highly anticipated Initial Public Offering of Reliance Power in less than 15 months, which is the biggest in Indian history. As of October 6, 2007, his total net worth is US$ 42billion and his personal stake in Reliance Communication is 66%. Forbes magazine listed his as the sixth richest man in the world after his brother Mukesh Ambani. Since his wealth tripled in only one year in percentage