shares of carmax inc kmx slipped 102 to 9927 tuesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 063 to 413215 and dow jones industrial average djia falling 067 to 3299012 the stocks fall snapped a threeday winning streak carmax inc closed 5671 short of its 52week high 15598 which the company achieved on november 8th despite its losses the stock outperformed some of its competitors tuesday as copart inc cprt fell 185 to 11453 autonation inc an fell 210 to 11956 and penske automotive group inc pag fell 125 to 11514true trading volume 17 m remained 386749 below its 50day average volume of 21 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