shares of davita inc dva rose 184 to 8239 tuesday on what proved to be an allaround great trading session for the stock market with the sp 500 index spx rising 146 to 407660 and the dow jones industrial average djia rising 109 to 3408604 davita inc closed 4242 below its 52week high 12481 which the company achieved on april 20th the stock underperformed when compared to some of its competitors tuesday as unitedhealth group inc unh rose 276 to 49919 and icon plc iclr rose 300 to 23071