shares of charter communications inc cl a chtr tumbled 1638 to 32834 wednesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 061 to 399532 and dow jones industrial average djia falling 042 to 3396635 the stocks fall snapped a threeday winning streak charter communications inc cl a closed 34153 short of its 52week high 66987 which the company reached on december 30th the stock underperformed when compared to some of its competitors