Tata Sons, the holding company of the $275-billion-plus Tata conglomerate, has narrowed its search for a successor to Chairman N Chandrasekaran to three prominent corporate leaders -- Tata Steel CEO and MD T V Narendran, Tata Sons Executive Director and Group CFO Saurabh Agrawal, and NSE MD and CEO Ashish Chauhan, people familiar with the matter said.