shares of packaging corp of america pkg slid 172 to 12940 wednesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 004 to 437686 and dow jones industrial average djia falling 022 to 3385266 packaging corp of america closed 1687 below its 52week high 14627 which the company achieved on august 16th the stock underperformed when compared to some of its competitors wednesday as international paper co ip fell 095 to 3137 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