On 2/14/13, Whiting USA Trust II (WHZ) will trade ex-dividend, for its quarterly dividend of $0.6508, payable on 3/1/13. As a percentage of WHZ's recent stock price of $16.67, this dividend works out to approximately 3.90%, so look for shares of Whiting USA Trust II to trade 3.90% lower all else being equal when WHZ shares open for trading on 2/14/13.