Operator List: S

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S & C Construction, Inc. S & H Oilfield Enterprises S & K Oil Production, Inc. S & S Oil Leasing S & S Oil, L.L.C. SAAW Operating LLC Sabre Exploration, LLC Sabre Operating, Inc. SAG Oil Company LLC Sage NR OK LLC Sage Oil LLC Sagebrush Operating LLC Salt Creek Resources, LLC Samco Investments Samedan Oil Corporation Samson Resources Company Samuel Gary Jr. & Associates, Inc. Samuel Jackson Production Co San Marco Petroleum, Inc. Sandlin Oil Corporation SandRidge Exploration and Production LLC Sanguine Gas Exploration, LLC Satchell Creek Petroleum, LLC Sauder Oil Co., LLC Schaben Oil LLC Schankie & Sons, LLC Schankie Well Service, Inc. Scheck Oil Operation Scheibmeir, Daryl Schierling, Eldon J. Schindler Oil, LLC Schindler, Joe Schippers Oilfield Services, LLC Schmeid Ranch, LLC Schmidt Construction Services LLC Schmidt, Terry D. Schmidt, Tracy Schulein Company LLC Schulte Oil Schulz Oil & Gas, Inc. Scott Services LLC Scott Works LLC Scott's Production, LLC Scout Energy Management LLC SCZ Resources, LLC SDOCO, LLC Secure Exploration and Production, LLC See Oil Seeker, LLC Seibert Oil, LLC

SEK Energy, LLC SH Oil Operations LLC Shakespeare Oil Co., Inc. Sharp, Robert L. Shawmar Oil & Gas Co., Inc. Sheedy Energy Production Company Shelby Resources LLC Shelley, Randall D. Shelton, Robert Shepler & Thomas, Inc. Shields Oil Producers Inc. Sho-Bar Energy, Inc. Shorts Production LLC Sieg Energy, Inc. Siemsen Operating, LLC Simminger, Robert John Jr Siroky Oil Management Six-D Exploration, LLC Slawson Exploration Company, Inc. Slawson, Donald C. SLO Oil, LLC Sloan Operations SM Oil & Gas, Inc. Smith Oil & Gas LLC Smith Oil Operations Smith, Darrin R Smith, David Smitherman, Leon C., Jr. Snedco, Inc. SNR Kansas Operating, LLC SNR Operating, LLC So & Jo, LLC SO-I , a General Partnership SoKan Operating, LLC Somerset Energy Enterprises, LLC Somerset Energy, Inc. Sommer Oil LLC Sonoma Resources LLC Sorensen, Kim A. Sotta, Donald E. Soule, Richard A. Southern Hills Gas Co. Southwest Gas Storage Company Southwind Petroleum Corp. Specht, Brian L. Speedy Well Service Spess Oil Company, a General Partnership Spiral Energy Corp Splechter, Tim Spradco, Inc.

Spring Creek Farm and Oil, LLC SPS, INC. Ssouri Oil Ventures St Johns Operating #1 LP ST Petroleum, Inc. Staab Energy & Leasing Staab Oil Co., a General Partnership Standard Operating Company Standlee, Jacci L Stanlee Oil LLC Steckel Oil, LLC Stecklein Oil Company, a General Partnership Steffen Resource Development, LLC Steinle Oil Steinle, Martin D. Stelbar Oil Corporation, Inc. StepCo Oil, Inc. Stephens & Johnson Operating Co. Stewart Petroleum Corporation Stewart Producers, Inc. Stice Oil Company Stone Oak Operating, LLC Stonegate Ranch, LLC Stoudt, Jean Marie Strata Exploration, Inc. StrataKan Exploration, LLC Streamline Energy, LLC Stripper Oil Co Stroke of Luck Energy & Exploration LLC Stuber, Virgil Studer Oil Co. Stull Crude Co, LLC Stull Oil LLC Sublette Feeders LLC Suemaur Exploration & Production, LLC Suerte Oil & Gas LLC Summit Operating LLC Summitt Energy, LLC Sundgren, Stephen E. and Jackie Sundown Energy Inc. Sunfire Energy Sunflower Exploration, LLC Sunflower Well Service, Inc. Sunswept Operating LLC Super Oilwell Service Superior Oilfield Services LLC Supernova Energy, Inc. Swenton, Michael J.