Medanta's Chairman Naresh Trehan, Landmark Group's CEO Renuka Jagtiani and Kaynes Technology Founder Ramesh Kunhikannan are among 25 new Indian billionaires to debut on Forbes World's Richest Billionaires List. Motilal Oswal also debuted on the list. A dozen people returned to the list, including financial services veteran Raamdeo Agrawal, business partner of Motilal Oswal.