shares of marsh  mclennan cos mmc inched 064 higher to 18052 wednesday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 045 to 413764 and the dow jones industrial average djia falling 009 to 3353133 marsh  mclennan cos closed 191 below its 52week high 18243 which the company reached on may 1st