Ajay Kalsi

Chairman of London-listed Indus Gas, which owns natural gas blocks in Rajasthan in western India, regains his billionaire status and climbs back into the ranks after a 2-year hiatus as shares of the energy firm jumped fourfold since January. Indus plans to spend $85 million to appraise and develop existing wells. Kalsi's other interests span real estate, business-process outsourcing and footwear. He has a small stake in Reebok India.