Shares of Yes Bank jumped as much as 8.4 per cent to Rs 21.70 apiece on the NSE in early trade on May 12, hitting their five month high. With this rally, the private sector lender's shares have surged over 22 per cent in the previous five trading sessions. The sudden rally prompted the BSE (formerly Bombay Stock Exchange) to seek clarification from the Bank regarding any disclosures that it needs to make which haven't been made yet.