BSE, formerly Bombay Stock Exchange, has been seeing a continuous churn at the top management level with Lakshman Gugulothu, CEO of the SME platform becoming the latest to jump ship. In the last four years alone, the bourse has seen close to a dozen high-profile exits. This river-like flow of executive talent is in sharp contrast to rival National Stock Exchange, where the top brass has remained unmoved, as serene as a lake, with Ravi Narain, MD & CEO and his colleague Chitra Ramakrishna holding fort for over a decade.