shares of pnc financial services group inc pnc slid 046 to 12370 tuesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 158 to 407163 and dow jones industrial average djia falling 102 to 3353083 pnc financial services group inc closed 5277 short of its 52week high 17647 which the company reached on may 31st