shares of quest diagnostics inc dgx sank 012 to 14078 thursday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 085 to 451004 and the dow jones industrial average djia rising 014 to 3439514 quest diagnostics inc closed 1756 below its 52week high 15834 which the company achieved on december 29th the stock demonstrated a mixed performance when compared to some of its competitors thursday as unitedhealth group inc unh fell 087 to 44775 iqvia holdings inc iqv rose 028 to 21963 and centene corp cnc fell 024 to 6365 trading volume 432820 remained 487819 below its 50day average volume of 920639 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