7. DuPont ( DD) is a specialty-products company, selling agricultural products, nutrition additives, performance chemicals and specialty coatings. DuPont's sales have advanced 18% in the past 12 months as net income and earnings per share soared 72%. Its fourth quarter net profit margin came in at 4.9%, down from 6.6% in the year-earlier quarter. In fiscal 2010, DuPont produced nearly $33 billion of sales and $3.7 billion of pre-tax income, but enjoyed an effective tax rate of less than 18%, down from 19% in 2009. It enjoyed a $109 million tax benefit from the U.S., with $245 million expensed for deferred taxes. It paid $454 million of current international taxes.