Reliance Industries Chairman Mukesh Ambani's net worth increased by $6.2 billion in a week to $83.2 billion as his company's shares rallied 10%, according to Bloomberg Billionaires Index. Ambani is currently the richest person in Asia and the 12th richest person in the world. As per the latest data available on exchanges, Ambani holds a 49.14% stake in Reliance Industries.