Shares of India's major private sector lender Bandhan Bank plunged in trade on Monday morning after the firm clarified on reports of being in talks with HDFC for control of Gruh Finance. Bandhan Bank share price plunged by nearly 4% to intra-day low of Rs 506, after the firm said in an exchange filing that it is unaware of the news and its source. " Thisis with reference to clarification sought via email today with respect to the captioned news item. In this regard, we would like to clarify that we are unaware of the above mentioned news item and its source. Further, Bandhan Bank Limited (the 'Bank') evaluates various opportunities on a continuous basis and the Bank, as a matter of policy, does not comment on market speculation," Bandhan Bank said in a stock exchange filing on Friday.