India, May 27 -- Nikhil Kamath was invited as the chief guest to Nita Ambani's school in Mumbai yesterday for the graduation ceremony of the class of 2025. Nikhil Kamath, 38, is the co-founder of stock brokerage firm Zerodha, a company that has made him one of India's youngest billionaires. During his speech, the Zerodha billionaire spoke about his first job, his first salary, how he started trading in the stock market and more.

But it was a comment directed at Mukesh Ambani, who had a front row seat at the graduation ceremony, that drew laughs from the audience. It also drew a sweet reaction from Nita Ambani.

Nita Ambani is the wife of Reliance Industries chairman Mukesh Ambani, who is India's richest man. She is also the founder of th...