Adexco Production Company
W.B. Osborn Oil & Gas
Paloma Partners I, LLC
Provident Royalties, LLC & Sinclair Oil and Gas Company
RIM Operating, Inc.
AC Exploration, LLC
St. Mary Land & Exploration
CLOSED
Lamamco Drilling Co.
St. Mary Land & Exploration
ExL Petroleum
Winn Exploration Co., Inc.
Stone Energy Corporation
Toreador Resources Corp.
Encore Acquisition Company
Layton Enterprises, Inc.
RBE, L.L.C.
Five States Energy Company
Orion Energy Resources, LLC
Longhorn Properties, LLC
Kestrel (PCI Drilling, L.P.)
Tensas Delta Exploration Co.
Dan A. Hughes Company
Tsar Energy II, LLC
Dale Resources, L.L.C.
JTD Resources, Inc.
Rio Petroleum, Inc.
Carneros Energy, Inc.
MBR Resources, Inc.
Summit Exploration, L.L.C.
Red River Production, L.L.C.
Nielson & Associates, Inc.
Nucor Oil & Gas, Inc.
Compass Oil & Gas, L.P.
Tensas Delta Exploration Co.
Fairplay Midstream, L.P.