shares of carmax inc kmx slid 122 to 6301 monday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 075 to 387198 and dow jones industrial average djia falling 039 to 3273295 the stocks fall snapped a twoday winning streak carmax inc closed 9297 below its 52week high 15598 which the company achieved on november 8th the stock underperformed when compared to some of its competitors monday as copart inc cprt fell 115 to 11502 autonation inc an rose 020 to 10631 and penske automotive group inc pag rose 087 to 11162 trading volume 13 m remained 10 million below its 50day average volume of 23 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