shares of carmax inc kmx rallied 213 to 6435 tuesday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 041 to 385610 and dow jones industrial average djia falling 024 to 3265320 carmax inc closed 9163 below its 52week high 15598 which the company achieved on november 8th the stock demonstrated a mixed performance when compared to some of its competitors tuesday as copart inc cprt rose 007 to 11510 autonation inc an rose 512 to 11175 and penske automotive group inc pag rose 270 to 11463 trading volume 21 m remained 241309 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