On 12/27/12, Edison International (EIX) will trade ex-dividend, for its quarterly dividend of $0.3375, payable on 1/31/13. As a percentage of EIX's recent stock price of $45.43, this dividend works out to approximately 0.74%, so look for shares of Edison International to trade 0.74% lower all else being equal when EIX shares open for trading on 12/27/12.