The conglomerate, which has seven listed companies, has lost more than $90 billion in market value in the week since Hindenburg published its report.
That stock market rout has wiped nearly $40 billion off Adani’s personal fortune.
Ambani’s net worth stands at $83 billion, making him the world’s ninth-richest person, while Adani’s wealth is estimated at about $75 billion, according to Forbes.
The turmoil comes despite a brief respite Tuesday for Adani when his flagship firm, Adani Enterprises, managed to issue new shares worth $2.5 billion.
At the peak of his wealth last year, Adani was the world’s second-richest person, ahead of Jeff Bezos.