shares of perkinelmer inc pki inched 080 higher to 16800 wednesday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 030 to 436380 and the dow jones industrial average djia falling 000 to 3437781 the stocks rise snapped a threeday losing streak perkinelmer inc closed 2400 below its 52week high 19200 which the company reached on september 23rd the stock outperformed some of its competitors wednesday as thermo fisher scientific inc