shares of cf industries holdings inc cf sank 021 to 8148 thursday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 064 to 453741 and dow jones industrial average djia falling 067 to 3528272 cf industries holdings inc closed 3812 below its 52week high 11960 which the company reached on august 26th trading volume 21 m remained 463340 below its 50day average volume of 26 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