Gautham Adani is second in the list of the world's richest people.
He surpassed Jeff Bezos to become the second richest man.
Adani's net worth is estimated at $155.7 billion, an increase of $5.5 billion.
Adani has overtaken Tesla's Elon Musk as the world's richest man.
In August, Adani overtook Louis Vuitton boss Arnault to take third place.
This is the first time that an Asian has been ranked among the top three billionaires.
Adani Group is the third largest conglomerate in India after Tata Group and Reliance Industries.
Adani Group is now planning to enter the telecom sector.
Bloomberg said in a report that it is looking for its foreign acquisition targets.