DuPont Teijin is North America's fifth-largest film and sheet business, according to a recent Plastics News ranking, with estimated sales of almost $1.4 billion in 2014. In the first nine months of 2015, DuPont's sales fell 12 percent to $19.8 billion, with operating profit down 13 percent to $3.7 billion. Performance Materials sales fell 13 percent to just over $4 billion, with operating profit down 1 percent to $935 million. Based on sales, Performance Materials ranked second among DuPont's six operating units in the nine-month period. Activist investors and Dow Chemica l Meanwhile, Dow Chemical has been jousting with activist investors, too. Third Point LLC, led by activist veteran Daniel Loeb, bought a stake in Dow in 2013 and called on the company to spin off its petrochemicals business — including plastics — in January 2014. Like DuPont, Dow made some concessions.