shares of carmax inc kmx slipped 155 to 7227 thursday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 017 to 413062 and dow jones industrial average djia falling 066 to 3330951 carmax inc closed 3397 below its 52week high 10624 which the company achieved on august 16th the stock demonstrated a mixed performance when compared to some of its competitors thursday as carvana co cl a cvna fell 905 to 1196 acv auctions inc acva rose 2042 to 1645 and kar auction services inc kar rose 121 to 1510 trading volume 995753 remained 14 million below its 50day average volume of 24 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