shares of davita inc dva dropped 073 to 7604 wednesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 070 to 389193 and dow jones industrial average djia falling 087 to 3187457 the stocks fall snapped a twoday winning streak davita inc closed 4877 below its 52week high 12481 which the company achieved on april 20th the stock demonstrated a mixed performance when compared to some of its competitors wednesday as unitedhealth group