On 1/31/13, Rose Rock Midstream L P (RRMS) will trade ex-dividend, for its quarterly dividend of $0.4025, payable on 2/14/13. As a percentage of RRMS's recent stock price of $32.95, this dividend works out to approximately 1.22%, so look for shares of Rose Rock Midstream L P to trade 1.22% lower all else being equal when RRMS shares open for trading on 1/31/13.