shares of merck  co inc mrk inched 052 higher to 11311 monday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 020 to 427379 and dow jones industrial average djia falling 059 to 3356286 this was the stocks fourth consecutive day of gains merck  co inc closed 654 below its 52week high 11965 which the company reached on may 3rd the stock underperformed when compared to some of its competitors monday as johnson  johnson jnj rose 086 to 15832 and pfizer inc pfe rose 076 to 3865 trading volume 50 m remained 14 million below its 50day average volume of 65 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