Article Photos: Oklahoma energy companies seek alternative sources of capital 1/5

Specialists Michael Gagliano, center, and Peter Giacchi, right, work at their on the floor of the New York Stock Exchange during the IPO of Rose Rock Midstream, on Dec. 9, 2011. Rose Rock is a master limited partnership that controls the midstream assets of Tulsa-based SemGroup Corp. <strong>Richard Drew</strong>