shares of merck  co inc mrk inched 086 higher to 7846 thursday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 013 to 440580 and the dow jones industrial average djia falling 019 to 3489412 merck  co inc closed 525 below its 52week high 8371 which the company reached on september 3rd the stock outperformed some of its competitors thursday as johnson  johnson jnj rose 078 to 17857 roche holding ag part cert rhhvf rose 022 to 40400 and pfizer inc pfe fell 103 to 4880 trading volume 89 m remained 15 million below its 50day average volume of 103 m editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use