shares of aflac inc afl shed 168 to 6550 thursday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 148 to 439366 and dow jones industrial average djia falling 105 to 3479276 aflac inc closed 147 below its 52week high 6697 which the company reached on february 10th the stock underperformed when compared to some of its competitors thursday as principal financial group inc pfg fell 156 to 7502 assurant inc aiz fell 144 to 19033 and unum group unm rose 068 to 3401 trading volume 25 m remained 314359 below its 50day average volume of 28 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