Billionaire Azim Premji's stake in NSE could be worth about $1.2 billion if the exchange lists at around ₹2,020 per share in its upcoming IPO, Bloomberg reported. Veteran investor Radhakishan Damani's holding could be worth around $835 million. Other investors poised for gains include Hero Group's Sunil Kant Munjal, Narayana Murthy's family office and the Haldiram's founding family.