THE FINAL 40

Nikhil Kamath dropped out of school at 15 and went on to build Zerodha into India's largest retail stockbroker, opening the stock market to millions who were once priced out. Alongside his brother Nithin, he built a bootstrapped brokerage into one of the country's most valuable financial companies, later founding True Beacon and Gruhas to support wealth management and the next wave of startups.