shares of carmax inc kmx advanced 649 to 8642 wednesday on what proved to be an allaround great trading session for the stock market with the sp 500 index spx rising 197 to 371904 and the dow jones industrial average djia rising 188 to 2968374 this was the stocks third consecutive day of gains carmax inc closed 6956 short of its 52week high 15598 which the company reached on november 8th the stock outperformed some of its competitors wednesday as copart inc cprt rose 218 to 11120 autonation inc an rose 467 to 11243 and penske automotive group inc pag rose 612 to 10701 trading volume 31 m eclipsed its 50day average volume of 12 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