The top executive at PNC Financial Services Group Inc. told financial analysts at an annual conference that he expects to lose customers in its home city of Pittsburgh to larger newcomers Bank of America Corp. and JPMorgan Chase & Co. But to counter, he’s aggressively going after their clients in new markets PNC (NYSE:PNC) is entering. “Other banks entering legacy PNC territories are going to win business, this is my thesis,” Bill Demchak, PNC chairman, president and CEO, said Wednesday at the Barclays Global Financial Services Conference in New York. “We have in Pittsburgh BofA and JPMorgan building branches.