According to the daily-updated index, Adani's wealth has soared by $61 billion so far this year. The self-made billionaire's businesses are involved in natural gas, coal mining and electricity generation.
The Adani Group owns India’s largest private sector seaport and airport operator as well as a huge coalmine in Australia. Moreover, the group has recently forayed into petrochemicals, cement, copper refining and data centres.
Adani was born to a middle-class family in Ahmedabad, Gujarat. He was dropped out of university before starting an export business in 1988.
The index named Tesla boss Elon Musk the world's richest person with an estimated $251 billion fortune. Amazon’s Jeff Bezos follows with $153 billion.