Shares of HDFC Bank dipped roughly 8% to hit a 52-week low of ₹772 during the early trading session on Thursday after part-time Chairman Atanu Chakraborty's resignation. "Certain...practices within the bank, that I have observed...are not in congruence with my personal values and ethics," Chakraborty said while resigning. Keki Mistry has taken interim charge as part-time Chairman.