shares of carmax inc kmx slumped 019 to 11096 tuesday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 069 to 454654 and the dow jones industrial average djia rising 078 to 3540524 the stocks fall snapped a twoday winning streak carmax inc closed 4502 below its 52week high 15598 which the company reached on november 8th the stock demonstrated a mixed performance when compared to some of its competitors tuesday as copart inc cprt rose 014 to 12943 autonation inc an fell 030 to 10867 and penske automotive group inc pag rose 202 to 10368 trading volume 11 m remained 278803 below its 50day average volume of 14 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