On 2/19/13, Boardwalk Pipeline Partners LP (BWP) will trade ex-dividend, for its quarterly dividend of $0.53, payable on 2/28/13. As a percentage of BWP's recent stock price of $26.85, this dividend works out to approximately 1.97%, so look for shares of Boardwalk Pipeline Partners LP to trade 1.97% lower all else being equal when BWP shares open for trading on 2/19/13.