On 2/19/13, Assured Guaranty Ltd (AGO) will trade ex-dividend, for its quarterly dividend of $0.10, payable on 3/7/13. As a percentage of AGO's recent stock price of $19.69, this dividend works out to approximately 0.51%, so look for shares of Assured Guaranty Ltd to trade 0.51% lower all else being equal when AGO shares open for trading on 2/19/13.