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Advance Energy Partners Hat Mesa LLC Adventure Operating Company, LLC Aera Energy LLC Aethon Energy Operating LLC AEXCO Petroleum Inc. Agave Oil & Gas, LLC Ageron Energy, LLC. Ajax Resources, LLC Allegro Investments, Inc. Alpha Shale Resource, LP Alta Mesa Services, LP Alta Vista Oil Corporation Ameredev LLC American Eagle Energy Corporation American Energy - Marcellus, LLC American Energy - Utica, LLC American Energy - Woodford, LLC American Energy Permian Basin American Energy Utica Americo Energy Resources, LLC Amistad Energy Services, LLC AMTEX ENERGY, INC Anadarko Petroleum Corporation Anschutz Exploration Corporation Antero Resources Corporation Anthis Land Company LLC Antle Operating, Inc. AOG OPERATING, LLC AOGP, LLC Apache Corporation Apex Energy LLC Apollo Operating, LLC Appalachian Energy, Inc. Appaloosa Operating Company LLC Approach Resources Arabella Petroleum Arcadia Operating, LLC Ardmore Production & Exploration Co. Ares Energy Ltd Ark-La-Tex Energy, LLC Arkland Producing Co., Inc. Arlington Petroleum LLC Armor Energy, LLC Arnold Oil Properties, LLC Arrington Oil & Gas Operating LLC Arris Petroleum Corporation Arrow Oil & Gas, LLC. Arrow Rock Energy, LLC Arrowhead Energy Inc. Arsenal Energy USA Inc. Arsenal Resources Aruba Petroleum, Inc. Ascent Resources - Marcellus, LLC Ascent Resources - Utica, LLC Aschere Energy Atalaya Resources, LLC Aterra Exploration, LLC Athlon Energy Operating LLC Atlantic Exploration Atlantic Operating, Inc. Atlantic Resources Company LLC Atlas Energy, L.P. Atlas Resource Partners, LP Atoka Operating Permian, LLC Atoka Operating, Inc. Atropos Exploration Company Augustus Energy Partners, LLC Augustus Energy Resources LLC Aurora Operarting, LLC Aurora Power Resources, Inc. Aurora USA Developement, LLC Aus-Tex Exploration, ltd. Avalon Exploration, Inc. Avalon Operating, LLC Axia Energy II, LLC Axia Energy, LLC Aztec Drilling & Operating, LLC B&L Exploration, L.L.C. B&W Operating, LLC B. R. Polk, Inc. Badlands Energy - Utah, LLC Ballard Exploration Company, Inc. BAM Permian Operating, LLC Banner Oil & Gas, LLC Baron Exploration Company BASA Resources, Inc. Basis Resources Group, LLC Bays Exploration, Inc. Bayswater Exploration & Production, LLC Baytex Energy USA Ltd BBL OPERATING COMPANY, LLC BBX Operating BC Operating, Inc. Beacon E&P Company, LLC Bean Resources.com Bend Petroleum Corp Berry Petroleum Best Petroleum Explorations, Inc. Betro, Inc. BHP Billiton Petroleum Big Star Oil & Gas, LLC Bill Barrett Corp Billy Jack Sharber Operating, LLC Bison Exploration, LLC Bison Oil & Gas II, LLC Black Creek Oil Company, LLC Black Crown Energy, LLC Black Diamond Minerals LLC Black Hills Exploration and Production Black Raven Energy, Inc. Blackbeard Operating BlackBrush O & G, Inc. BlackBrush O & G, LLC BlackRidge Resource Partners BlackWell Exp & Development, LLC Blake Production Company, Inc. BLS Production Co., Inc. BLUE CHIP OIL INC Blue Dolphin Production, LLC Blue Quail , LTD BlueCrest Alaska Operating LLC Bluefin Resources LLC Bluescape Resources BlueStem Energy Bluestem Energy Holdings, LLC BlueStone Natural Resources BLX, Inc. BNK Petroleum (US) Inc BNK Petroleum (US) Inc. Boaz Energy II Operating, LLC Boaz Energy, LLC. Bold Operating, LLC Bonanza Creek Energy, Inc. BOPCO, LP Borderline Operating Corp BP America Production Company Braka Operating, LLC Brammer Engineering, Inc. Bratco Operating Company Bravo Arkoma LLC Breck Operating Corp. BreitBurn Breitling Operating Corporation BRG Lone Star LTD BRG Petroleum LLC Bridon Energy LLC Bridwell Oil Company Brigadier Operating LLC Brigham Resources Operating, LLC Bright Horizon Resources Broad Oak Energy II LLC Brooks Range Petroleum Corporation BTA Oil Producers LLC Buffco Production,Inc Bulldog Operating Company Bullet Development, LLC Burk Royalty Co., LTD. Burk-Gunn Oil Company Burnett Oil Co., Inc. Butkin Oil Company, LLC Butler Petroleum, LLC BVX OPerating Inc. C & C Productions, LLC C. E. Harmon Oil, Inc. C6 Operating, LLC Cabot Oil & Gas Corp Caelus Energy Caerus Oil and Gas LLC Caird Operating, LLC California Resources Corporation Callon Petroleum Operating Company Calyx Energy III, LLC Calyx Energy, LLC Cambrian Management, Ltd Campbell Oil & Gas. Inc Canan Mowrey Operating, LLC Canan Operating, Inc. Cantera Operating LLC Canyon Creek Energy Operating, LLC Capitan Energy INC Capstone Natural Resources II, LLC Capstone Natural Resources, LLC Caraway Operating Company Caribou Operating, Inc. Carl E. Gungoll Exploration LLC Carmony Exploration, LLC Carrera Energy, LLC Carrizo Oil & Gas, Inc. Cartledge Oil Company Casa Grande Exploration Company Cascade Petroleum Casillas Operating, LLC Castleton Commodities International Catamount Energy Partners Cazador Operating, LLC Cazar Energy, Inc. CBL Resources, LLC CBM Gas Company LLC CCI East Texas Upstream LLC Centennial Resource Production, LLC Central Resources, Inc. Centrex Operating Co Century Exploration Houston, LLC CEP MID-CONTINENT LLC CH4 Energy II, LLC Champion Lone Star Operating Chaparral Energy, LLC Charger Oil & Gas LLC Charles P Dunning LLC Charter Oak Production Co., LLC Cher Oil Company, Ltd. Chesapeake Operating, Inc. Chevron USA Inc. Cheyenne Petroleum Company Chief Oil & Gas CHISHOLM ENERGY OPERATING, LLC chisholm Oil and Gas Operating, LLC Choate Disposal Services LLC Choice Exploration, Inc. Cholla Petroleum, Inc. chuza oil company CIE Cimarex Energy Co. Cimarex Energy Co. of Colorado Cimarron Engineering LLC Cinco Natural Resources Corporation Cinco Oil & Gas, LLC Cinnabar Energy, LTD. Circle 9 Resources LLC Cirque Resources LP Cirrus Production Company Cisco Operating, LLC Citation Oil and Gas Corp. Citizen Energy II Citrus Energy Corporation Clayton Williams Energy, Inc. Clear Fork, Inc. Clear Water, Inc. CML Exploration, LLC Coachman Energy / Cynosure Energy COBRA OIL & GAS CORPORATION COG Operating LLC Colgate Operating, LLC Comanche Exploration Co., LLC Comanche Resources Company Compass Energy Operating, LLC Comstock Oil & Gas Condor Energy Technology LLC Confluence DJ LLC ConocoPhillips Company/Burlington Resources CONSOL Energy Inc. Continental Exploration LLC Continental Resources, Inc Cook Inlet Energy Cooper Oil & Gas, LLC Copestone Operating LLC Corda Corporation Corinthian Exploration (USA) Corp. Corlena Oil Company Cornerstone Natural Resources Cornerstone Natural Resources LLC Cornerstone Petroleum Operating, LLC Corterra Energy Operating, LLC Costa Energy, LLC Council Oak Resources Covenant Operating, LLC Covey Park Gas Covey Park Operating, LLC Covey Park Resources, LLC Covington Oil Co., Inc. CP Exploration CR3 Operating Company LLC Craig Elder Oil and Gas, L.L.C. Craton Alpha LLC Crawley Petroleum Crescent Point Energy US Corp Crest Resources, Inc. Crestone Peak Resources Crimson Energy Partners III, LLC Crimson Exploration Oper. Inc. Crimson Resource Management Criswell Energy, LLC Cross Creek Energy LLC Cross Timbers Energy, LLC Crow Creek Operating Co. III, LLC Crown Energy Company Crown Equipment Co. CrownQuest Operating, LLC Cub Creek Energy, LLC Cummings Oil Company Custer & Wright Operating, Inc Cypress Operating, Inc. D&B Operating LLC D&J Oil Co., Inc D.J.F. Services, Inc. Dakota Resources, Inc. Dallas Petroleum Group, LLC Dallas Production, Inc Danick Operating USA Danmark Energy LP Dave holke Consulting, Inc. Davidson Energy, Inc. DE Operating LLC Dejour Energy (USA) Corp. Delta CO2, LLC Delta Oil & Gas Ltd. Demco Oil and Gas Company Denali Oil & Gas Management Denbury Onshore, LLC Devon Energy Production Company L. P. Dewbre Petroleum Corporation Diamond Production Co., LLC Diamondback E&P LLC Diamondback Resources,LLC Dick Lindsay Oil Co Dinero Operating Discovery Natural Resources LLC Discovery Oil and Gas, LLC Discovery Operating, Inc. Dominion Natural Resources, LLC donray petroleum llc. Dorado E&P Partners, LLC Dore Energy Co., Ltd. Double Eagle Operating Douglas Q. Jones, LLC Dove Oil Corporation Draco Energy, Inc. Dragon Oil & Gas LLC DTE Gas Resources, LLC Dugan Production Corp. Duke Gas Company, LLC Duncan Oil Properties Dyad Petroleum Company E. N. Patton Oil Company, Inc. E.G.L. Resources, Inc. Eagle Energy Acquisitions LP Eagle Exploration Production, LLC Eagle Hydrocarbons Inc. Eagle Oil & Gas co. Eagle Road Oil LLC EAGLE ROCK MID-CONTINENT OPERATING, LLC EAGLE ROCK OPERATING COMPANY, LLC EagleRidge Energy, LLC Earlsboro Energies Corp. East Cheyenne Gas Storage, LLC EastCo Operating, LLC Echo Production, Inc. Eclipse Resources I, LP EDF Trading Resources, LLC Edge Barnett Operating Company LLC Edge Energy, LLC EdgeMarc Energy Holdings, LLC EE3 LLC EEC, Inc. EF Energy, LLC El Paso E&P Company El Toro Resources LLC Element Petro Operating II, LLC Element Petroleum OP III,LLC Element Petroleum Operating, LLC Elephant Oil & Gas Elevation Resources, LLC Elk Meadows Resources, LLC Elk Petroleum Elk River Resouces, LLC. Ellis Exploration, Inc. Elm Ridge Exploration Co LLC Emerald Oil Inc Emerald Oil LLC Empresa Energy LLC Encana Oil & Gas (USA) Inc. Endeavor Energy Resources Endeavor Natural Gas, LP Endeavour Operating Corp Endeavour Operating Corporation Endurance Resources LLC Enduring Resources LLC Enduro Operating II LLC Enduro Operating LLC Energen Resources Corporation Energy & Exploration Partners Operating, LP Energy Corporation of America Energy Hunter Resources, Inc. Energy Management Co. EnergyQuest II, LLC Enerplus Resources (USA) Corporation EnerQuest Operating L.L.C. EnerVest, Ltd. Enexco, Inc. Entek GRB LLC ENTERPRISE ENERGY EXPLORATION INC. EOG Resources, Inc. EP Energy EQT Production ER Operating Company Ergon Exploration Escondido Resources II, LLC Estancia Oil & Gas, LLC Evertson Operating Company EW Energy Operator, LLC Excalibur Reserouces EXCO Resources, Inc. EXCO/HGI JV Assets, LLC ExL Petroleum, LP Extex Operating Company EXTRACTION OIL & GAS LLC F. Howard Walsh, Jr. Operating Co., Inc. Fair Oil, Ltd. Fairway Resources Op. LLC Fairway Resources Operating III, LLC Fairways Exploration & Production, LLC Far West Development, LLC Farmer Operating, LLC Fasken Oil and Ranch, Ltd. FDL Operating, LLC Felderhoff Production Co FELIX ENERGY HOLDINGS II, LLC FELIX ENERGY LLC FHA Operating Fidelity Exploration & Production Fidgets Energy, LLC Fifth Creek Energy Operating Company LLC Figure 3 Operating LLC FIML Natural Resources, LLC Finley Resources, Inc. Finney Oil Company FireWheel Operating, LLC Five States Energy Fivestones Energy LLC FLAMINGO OPERATING, LLC Fletcher Petroleum Corp. Flint Interest, LLC Foree Oil Company Foreland Operating, LLC Forest Oil Corporation Forestar Forge Energy, LLC Fortay, Inc. Forty Acres Energy LLC Fossil Resources, Inc. Foundation Energy Management, LLC Four C Oil and Gas Corporation Four Corners Petroleum II, LLC FourPoint Energy Fouts Oil & Gas, LLC Fox Northeastern Oil & Gas Corporation Franks Exploration Company, LLC Freedom Production, Inc. Freeport-McMoRan Oil & Gas Fritzler Resources, Inc. Fuego Energy, LLC Fulcrum Exploration, LLC. Fuller Production, Inc. Furie Operating Alaska Fuse Energy, LLC G.A. Hawkins G3 Operating, LLC. Gaedeke Oil & Gas Operating, LLC Galt Investment Company, LLC Garry Davis Oil, LLC Gasco Energy, Inc. Gastar Exploration Inc. Gateway Resources USA Inc GeoSouthern Energy Corporation GeoSouthern Operating II, LLC GeoSurveys, Inc. GEP HAYNESVILLE, LLC GHA Barnett, LLC Gilliland Oil & Gas, Inc. Ginnings Company GLB Exploration, Inc. GLEN D. GONZENBACH, LLC GLIMP OIL COMPANY, LLC GMX Resources Goodrich Petroleum Company, LLC Gordon Creek, LLC. Gosney & Sons, Inc. Goza Lucerne Prospect, LLC Grant Canyon Oil and Gas Great Plains Operating, LLC Great Western Oil & Gas Company, LLC Green Century Exploration & Production, LLC Greg Hall Oil and Gas Grenadier Energy Partners II Greystone Oil & Gas LLP Greystone Petroleum Griffin Petroleum Company Griggs and Bales Grynberg Petroleum Guidon Energy Management Services LLC Guinn Investments, Inc Gulf Bend Resources, LLC GULF EXPLORATION, L.L.C. Gulf Pine Energy Gulfport Energy Corporation GulfTex Energy III, LP Gunn Oil Company Gunnison Energy Corporation Gunnison Energy LLC Gus Jones Cable Tool Service LLC H&L Exploration Company, LLC Hadaway Consulting and Engineering, LLC Halcón Operating Co., Inc. Halcon Resources Corporation Hall & Ross Resources Halvey Energy, LLC HAMMAN OIL AND REFINING COMPANY Hannathon Petroleum, LLC Harmonia Petroleum Corporation Hat Creek Resources, LLC Hawkwood Energy Operating, LLC Hazelwood Production & Exploration Company, LLC Headington Energy Partners, LLC Headington Oil Company Hebron Energy, LLC Heights Energy Corporation Helis Oil & Gas Company, L.L.C. Henry Resources LLC Hess Corporation Hewitt Operating Inc. Hibernia Resources, LLC Highlands Natural Resources HighMount Exploration & Production Hilcorp Alaska, LLC Hilcorp Energy Company Hill-Lake Gas Storage, LLC HILLCREST PETROLEUM, LLC Hinkle Oil & Gas, Inc. HMD OIL CO, INC Hogback Exploration, Inc Hollimon Oil Corporation Holmes Exploration, LLC HORST ENERGY LLC HPC ENERGY LLC HRC Operating, LLC. Hulen Operating Company Hunt Marcellus Operating Company Hunt Oil Company Huntington Energy, L.L.C. Hurd Enterprises Husky Ventures, Inc. HW Operating, LLC HWH DRILLING LLC I-Mac Petroleum Service Inc. ICA Energy Operating, LLC Imperial Gas Resources, LLC ImPetro Operating LLC Incline Energy Independence Resources Management, LLC. Indigo II Louisiana Operating, LLC Indigo Minerals Inflection Energy (PA) LLC Inland Operating Company International Energy Corporation International Energy Corporation of Northern Oklahoma Interstate Explorations LLC Iron Star Energy, LLC Ironwood Oil and Gas, LLC ITEXCO TEXAS, LLC J & J PRODUCTION COMPANY J & T Operating LLC J CLEO THOMPSON J L Watkins J-Brex Company J-D-O Oil Co. J-Lyn Oil CO. J-W Operating Company J.I. Staley Co., LLC Jabsco Oil Operating, LLC Jagged Peak Energy JAMEX, Inc. Jay-Bee Oil & Gas, Inc. JB Production LLC JDL Operating, LLC Jerry Hess Operating Company Jetta Operating Company, Inc Jetta Operating Compnay, Inc Jilpetco, Inc. Jimmy Chatham Oil & Gas JKLM ENERGY JM COX RESOURCES, L.P. JMA ENERGY COMPANY JMH Production, LLC Johanson Oil John M. Clark, Inc. Johnson & Ernst Operating Co. Jolen Operating Company Jonah Energy LLC Jones Energy llc Jones Energy Ltd Juneau Energy, LLC Juniper Resources Exploration Company, LLC Juno Operating Company II, LLC JVA Operating Company, Inc. K S OIL COMPANY, INC K.P. Kauffman Company K.S. Oil Company KA Energy Op Co., LLC Kaiser-Francis Oil Company Kaler Energy Corp. Katsco Energy, Inc. Keith F. Walker Oil & Gas Co., LLC Kelly Cook Oil LLC Keystone Petroleum NM LLC KGH Operating Company Killam Oil Co., Ltd. Kinder Morgan Kinder Morgan Tejas Pipeline, LLC king energy llc King Operating Corp. Kirkpatrick Oil Company KJ Energy, LLC Koch Exploration Company, LLC Kodiak Oil & Gas Corp Kodiak Oil & Gas, Inc. Kovar Operating, LLC Kraken Operating LLC L & M Operating, Inc. L.E. Jones Operating, Inc. La Vernia Oil LADD OIL & GAS CORPORATION Laddex, Ltd Lainco, Inc. Lakeshore Operating, LLC Lakota Energy, LTD. Lance Ruffel Oil and Gas Land and Natural Resource Development, Inc Lane Operating Company Lapetco Inc Laramie Energy II, LLC Laramie Energy, LLC Laredo Energy Laredo Energy Operating, LLC Laredo Petroleum, Inc. Lario Oil & Gas Company Latigo Oil & Gas, Inc. Latigo Petroleum, LLC Layline Petroleum LCS Production Company LeClair Operating Co., Inc. Legacy Exploration, LLC I Legacy Oil & Gas ND, Inc. Legacy Reserves Operating LP Legado Permian, LLC Legend Natural Gas, LLC LeNorman Operating LLC Lera Levant Energy LLc Lewis Energy Group Lewis Oil Operations, LLC Lewis Operating Co. Liberty Operating, Inc. Liberty Resources LLC Liberty Resources Management Company, LLC Lighthouse Oil & Gas LP Lime Rock Resources, LP Limestone Exploration II, LLC Linn Energy, LLC LITTLE RIVER ENERGY CO Llewellin Operating Company, LLC LOGOS Operating, LLC Lone Star Land & Energy II Longfellow Energy, LP Longs Peak Energy LP Operating, LLC LUCA RESOURCES GROUP, LLC M. E. Operating and Services, Inc. Macha Enterprises Inc Mack Energy Co. Mack Energy Corporation MACKELLAR INC Mackey Consulting & Leasing LLC Magnet Oil LP Magnum Energy, Inc. Magnum Hunter Resources Corp Magnum Producing, LP MAK-J Energy Colorado, LLC. Makoil Inc Mallard Exploration Malone-Marsh Well Mammoth Exploration, LLC Manti Exploration Operating LLC Manti Tarka Permian MANZANO, LLC Marathon Oil Marjo Operating Mid-Continent, LLC Marlin Energy Resources, LLC Marlin Energy Southwest GP, L.L.C. Marshall & Winston, Inc. Martin Production Company Matador Production Company Matrix Oil Corporation Maverick Brothers Resources,LLC Maverick Operating, LLC Maximus Operating, LTD. McClure Oil Co. McCommons Oil Company McElvain Energy, Inc. MCG Oil & Gas Operating, LLC McOil Operating Company MD America Energy LLC MDC TEXAS ENERGY MDS Energy Development LLC MDS Energy, Ltd Meade Energy Corp. Meason Petroleum LLC MECO IV, LLC Medders Oil Company, Inc. Mego Resources, LLC Memorial Production Oper. :LLC Memorial Resource Development LLC MENDELL FINISTERRE II LLC Merit Energy Company Merit Energy Company LLC Meritage Energy Company, LLC Mertz Energy LLC Mesa Energy Partners, LLC Mesquite SWD Mestena Operating, L.L.C. Metano Energy III, LP MEWBOURNE OIL COMPANY Mid-Con Energy Operating, LLC Mid-States Operating Company Midenergy Operating, LLC Midland Energy Inc. Midland Oil And Gas, Inc. Midstates Petroleum Company Midville Energy Milagro Exploration, LLC Mineral Resources, Inc Missouri River Resources MLC Operating, LP MM Energy, Inc. Mohican Operating Molopo Energy Texas, LLC Momentum Operating Co., Inc. Monarch Energy Co., LLC Moon-Hines-Tigrett Operating Co., Inc. Moore Petroleum Investment Corp. Mortimer Production Company Mosbacher Energy Company Mountain Creek Energy, Inc. Mountain Divide LLC Mountaineer Keystone, LLC MPB Oil & Gas Mr. MRD OPERATING LLC Mt. Dora Energy Mueller Exploration, Inc. Murchison Oil & Gas Inc Murex Petroleum Corp. Murphy Exploration and Production USA Musgrove Energy Inc. Muskegon Development Company Mustang Creek Energy LLC Mustang Fuel Corporation MWS Producing, Inc. N S P Operating Group LLC Nadel and Gussman Nadel and Gussman Permian, LLC Naifco Oil & Gas, LLC National Fuel Corporation Navidad Resources LLC NBL Permian LLC Neches Exploration, L.L.C. Nemo Fund I, LLC NEOK Production Co., LLC New Century Operating, LLC New Dominion LLC New Gulf Resources, LLC Newark E&P Operating, LLC Newfield Exploration NFR Energy LLC NGO Development Corporation Nighthawk Production LLC Nine Point Energy, LLC NMR Energy LLC Noble Energy, Inc. Noble Resources, Inc. North Plains Energy, LLC Northeast Natural Energy LLC Northstar Gas Company, Inc. NorthStar Operating Company NP Resources O'Benco, Inc. O'Brien Oil Corporation OAK Valley Operating, LLC Oak Valley SWD LLC Oasis Petroleum Occidental Oil and Gas Ohio Valley Energy Systems Corp. Oil Producers, Inc. of Kansas Oil Projects, LLC Okland Oil Company Omimex Petroleum Inc. Omni Oil & Gas, Inc. OneEnergy Partners Operating, LLC Opal Resources Operating Company Opus Operating II LLC Opus Operating, LLC Orca Operating Company, LLC Osage Exploration and Development Osage Exploration and Develpoment, Inc. OSBORN HEIRS COMPANY Overland Resources LLC P.O.&G. Operating, LLC Pablo Energy II, LLC PACE OPERATING Pacesetter Energy, LLC Pacific Energy & Mining Company Paladin Petroleum III LLC Palm Oil & Gas Company Palmer Petroleum, Inc. Paloma Operating Co, Inc Paloma Resources, LLC Pantera Energy Company Panther Energy Co. II, LLC PAR MINERALS CORP Parallel Petroleum LLC Parsley Energy Operations, LLC Partee Drilling Inc Parten Operating, Inc. Patara Oil & Gas, LLC Patriot Resources, Inc. Paul Burton, LLC Paul Gillham Oil Company Pay Dirt Energy, LLC Payne Exploration Company PayRock Energy, LLC PCORE Exploration & Production LLC PDC Energy Peak Permian, LLC Peak Powder River Resources, LLC Peak Texas Resources, LLC Pearl Resources Operating Co., LLC Pecos Operating Company, LLC Pedernales Production, LP Pedestal Oil Company, Inc. Pendragon Oil Co. Penn Virginia Corporation Penn Virginia Oil & Gas Corporation PennEnergy Resources, LLC Pennington Operating Company, LLC Pennsylvania General Energy Peregrine Petroleum Partners, LTD Performance Operating Company Periscope Operating LLC Perkins Energy Company Permian Deep Rock Oil Co., LLC Permian Resources Peterson Energy Operating, Inc. PETEX Petro Harvester Operating Company LLC Petro Harvester Operating Company, LLC Petro Hunt, L.L.C. Petro-Guard Production LLC Petrodome Operating, LLC PetroEdge Energy III LLC PetroEdge Energy IV, LLC Petroglyph Operating Company, Inc. Petrogulf Corportation Petron Energy II, Inc. Petroplex Energy Inc. PetroPoint Energy Operating, LLC. PetroQuest Energy LLC PetroShale (US), Inc. PetroShare Corp Petrox Resources Inc. PHOENIX OIL & GAS, INC. Phoenix PetroCorp, Inc. Piceance Energy, LLC PICO Niobrara LLC Piedra Operating, LLC PINEDALE ENERGY PARTNERS OPERATING LLC Pioneer Natural Resources Pitts Energy Co Plains Exploration & Production Company Platinum Energy Solutions Plymouth Exploration, LLC PMO Poblano Energy LLC Pollok Energy POP Operating Company PostRock Energy Corp. Postrock Midcontinent Production LLC PPC Operating Company LLC Prairie Resources LLC Pregler Oil Company, LLC Premier Natural Resources II, LLC Prentice Oil Company LLC Presley Operating LLC PRI Operating, LLC Price Operating, LLC Pride Energy Company Primary Natural Resources III Prime Operating Company Primexx Operating Corporation Propel Energy, LLC Prospect Protege Energy III LLC Pruet Production Co. Pruitt Operating Co. LLC PT Petroleum, LLC. Pursuit Oil & Gas, LLC Q P, Inc. QEP Energy Company Qstar Operating LLC Quanah Panhandle, LLC Quantum Resources Management, LLC Quartz Mountain Oil & Gas LLC Quicksilver Resources Inc. R E Blaik Inc R. Baker Oil, LLC R. Lacy Services, LTD R2Q Operating LLC Rainbow Seven Oil and Gas Ranchers Exploration Partners, LLC Ranchers Resources Inc. Range Louisiana Operating, LLC Range Resources Corporation Ranger O&G RANKEN ENERGY CORPORATION Raw Oil & Gas, Inc. Ray Herring Operating Co., LLC Ray Richey Managment Company, Inc. Rebellion Energy Red Bluff Resources Red Fork (USA) Investments, Inc. red fork production, llc Red Hawk Petroleum, LLC Red Mountain Operating LLC Red Rocks Oil & Gas Operating LLC Red Willow Production Company Red Willow Production, LLC Redbud E&P, Inc. Redland Resources, Inc. Reeder Energy Reid Williams Operating, Inc. Reliance Energy, Inc Renegade Oil & Gas Company, LLC REOC, LLC Repsol O&G, LLC. RESACA RESOURCES, LLC Resolute Natural Resources Reveille Oil & Gas Operating, LLC Revelation Gas & Oil Oklahoma Rex Energy Reynolds E & P, Inc RG Exploration LLC RHDK Oil & Gas, LLC Rice Drilling B, LLC Richland Resources Corporation Ricochet Energy, Inc. Rife Energy Operating Riley Exploration, LLC RIM Operating, Inc Rimrock Resource Operating, LLC Ring Energy, Inc. Rio Petroleum, Inc. RK Petroleum Corp. RKI Exploration & Production RLU Operating, LLC RMB Operating LLC RMD Roberson Oil Company, Inc. Robert L. Bayless, Producer LLC Rock Creek Resources, LLC Rock Oil Company Rockefeller Hughes (USA) LLC Rocky Top Energy Roff Operating Company Rosehill Operating Company, LLC Rosetta Resources Rosewood Resources Roundtree & Associates, Inc. Rover Operating Company, LLC Rover Petroleum Operating, LLC ROX Exploration, Inc. Royalty Land & Dev. Co., Inc. RP Operating, LLC RSP Permian, LLC rtb oil,inc. Running Horse Production Company S. B. STREET OPERATING, INC. Sabalo Exploration Operating,LLC Sabalo Operating, LLC Sabinal Energy Sabine Oil & Gas Corporation Sabine Oil & Gas LLC Sable Permian Resources Saddle Operating, LLC Saga Petroleum LLC Sahara Operating Company Samson Samson Exploration, LLC Samson Oil and Gas Montana, Inc. San Angelo Operating Corp. Sanchez Oil & Gas Corporation Sandalwood Exploration, LP SandRidge Energy Sanguine Gas Exploration Sauder Management Company Schlachter Operating Corp. Schneider Energy Services Scout Energy Partners SDX Resources, Inc. Seaboard Operating Co. SEC Production Seguro Oil and Gas LLC Seidler Oil & Gas Operating, LLC Sellers Lease Service, Inc Selous Energy, LLC SEM Operating Company, LLC Seneca Resources Corporation SEP - OK 1 LLC Sequel Energy, LLC SG Interests I Ltd. SGP Operating LLC Sharp Image Energy, Inc. SHD Oil & Gas, LLC Shell Oil Company affiliate Shenandoah Resources, LLC Sheridan Production Company, LLC Sierra Resources, LLC Silver Creek Oil & Gas, LLC Silver Hill Energy Partners, LLC Silver Oak Energy, LLC Silver Spike Energy Silver Tusk Operating Co. LLC Silverback Operating, LLC Sinclair Oil & Gas Company SingleTree Resources, Inc. SK Plymouth, LLC Sklar Exploration Company L.L.C. Slant Operating Slawson Exploration Company, Inc. SM Energy Smith Energy Operating Company SN EF Maverick, LLC SN Operating, LLC Snyder Brothers Inc. Sojourner Drilling Corporation Sonterra Energy, LLC Sooner Oil and Gas Mgt Inc South Sands Exploration, LLC Southern Bay Operating, L.L.C. Southern Oklahoma Production Southlake Exploration Inc. Southland Royalty Company LLC Southwest Royalties, Inc. Southwestern Energy Southwestern Energy Ventures Company LLC Sovereign Operating Company LLC SPENCER OIL COMPANY Spess Oil Company Spindletop Oil & Gas Spooner Petroleum Company Spring Operating Company Square Mile Energy, LLC Stacy Operating LLC Staghorn Petroleum II, LLC Staghorn Petroleum, LLC Stanolind Operating LLC Stasney Well Service, LLC Statoil Oil & Gas LP Statoil Texas Onshore Properties LLC Statoil USA Onshore Properties Inc. Steller Energy & Investment Corp Stephens & Johnson Operating Co. Stephens Energy Group LLC Stephens Production Company Steward Energy II, LLC Steward Energy, LLC Stingray Oil Company, Inc. Stone Creek Operating, LLC Stone Energy Corporation Stonegate Production Story Oil & Gas, Inc. Stout Energy Inc. Stovall Operating Co. Strand Energy, L.C. Strat Land Exploration Co Stratex Oil & Gas Holdings Inc Stroud Petroleum, Inc. Sue-Ann Operating, L.C. Suemaur Expl. & Prod., LLC Summit Energy Management Summit Petroleum LLC Sunburst, Inc. Sundance Energy Sundown Energy L.P. SunRay Operating Co. Inc. Superior Oil & Gas, LLc Surge Operating, LLC Sutherland Energy Co., LLC Sutton PRoducing Corp. SV Energy Company, LLC Swift Energy Operating, LLC SWJN Oil Company Sydson Energy, Inc Synergy Resources Corporation Tabula Rasa Energy TACOR Resources, Inc. Talisman Energy USA Inc. TALL CITY OPERATIONS LLC Tamarack Petroleum Company, Inc. Tanos Exploration II, LLC Tanos Exploration, LLC Tapstone Energy TAQA North USA, Inc. Tarka Energy, LLC TBK Energy Company TDX Energy, LLC Teakwood Operating LLC Teal Natural Resources Tecolote Energy Operating, LLC Tecpetrol Operating LLC Tekton Energy Telesis Operating Co., Inc. Tellus Operating Group, LLC Tema Oil and Gas Company TEP Barnett USA, LLC TEP Rocky Mountain LLC Terrace Energy Territory Resources Tessera Energy, LLC Tex-Star Production Texakoma Operating, L.P. Texas American Resources Company Texas Energy Holdings, Inc. Texas International Energy Partners Texas Presco, Inc. Texas Royalty Corp Texas Secondary Oilfield Services Texegy Operating Company LLC Texland Petroleum, LP Texon Oil Company, Inc. Texoz E&P I, Inc. Texxol Operating Company TFI Operating The Cumming Company, Inc. THE EDMAR COMPANY, LLC The Termo Company The Warren Corporation Thompson Engineering and Production Corp. Thorp Petroleum Corporation Three J Energy, Inc. Three Rivers Operating Co II LLC Three Rivers Operating Co III LLC Three Rivers Operating Company, LLC Three Sands Oil, Inc. Three Span Oil & Gas, Inc. Three Summits Operating LLC Thunder Oil & Gas, LLC Thunderbird Resources LP Tilford Pinson Exploration, LLC Timber Creek Operating Titan Energy, LLC Titan Oil & Gas Titan Operating, LLC TMR Exploration, Inc. Toklan Oil and Gas Corp TOP Operating Co. Torch Production Company, LLC Tracker Resource Dev III, LLC Tradition Resources LLC Trail Ridge Energy Partners II LLC Trans Pacific Oil Corp. Trap Rock Oil, LTD. Travis Peak Resources, LLC TreadStone Energy Partners Operating, LLC Treadstone Energy Partners, LLC Trek Resources, Inc. Trendwell Energy Corp Trey Resources Inc. Tri-C Resources, LLC Triad Energy, Inc. Triad Hunter LLC. Triana Energy Triangle USA Petroleum Corporation Trilogy Operating, Inc. Trilogy Resources, LLC Trinity Operating (USG), LLC Trinity River Energy Operating, LLC Trio Consulting & Management, LLC TriPowwer Resources, LLC Triumph Energy Partners LLC Triumph Exploration, Inc. TRU Operating LLC. True Oil Company LLC True Oil LLC True Wolf Operating, LLC Truevine Operating, LLC Tug Hill Operating, LLC Tundra Operating, LLC Twilight Energy LLC Twisted Oak Operating, LLC TXON Partners LLC TXP, Inc. U.S. Enercorp, LTD. U.S. Energy Development Corp. Ultra Resources Union Gas Operating Company Union Valley Petroleum Corp Unit Petroleum United Production Company, LLC Unitex Oil Company Upham Oil & Gas Company Urban Oil and Gas Group Ursa Operating Company LLC Utah Gas Corporation V-F Petroleum Inc. VAALCO ENERGY (USA), INC. Valence Operating Company Valley Petrol Consulting Inc Valpoint Operating, LLC Van Operating Vanguard Natural Resources, LLC Vanguard Operating, LLC Vanguard Permian LLC Vantage - Uinta LLC Vantage Energy Appalachia II LLC Vantage Energy Appalachia LLC Vantage Fort Worth Energy LLC Vaughn Good Oil Co. LLC Venado Oil & Gas LLC Venado Oil & Gas, LLC Venoco Inc Ventex Operating Corp. Venture Oil & Gas Verado Energy, Inc. Verdad Oil and Gas Corporation Verdun Oil Company Veritas Energy, LLC Vermilion Energy USA LLC Vess Oil Corp Viceroy Petroleum Viejo Energy I, LLC Vine Oil & Gas LP VirTex Operating Company, Inc. Vitol Resources Inc. of Delaware Vitruvian Exploration II, LLC W&T Offshore, Inc. W.T. Waggoner Estate Wachob Oil & Gas LLC Wagon Wheel ArkLaTex, LLC Wagon Wheel Operating, LLC Walsh & Watts, Inc. Walsh Petroleum, Inc. Walter Black Warrior Basin LLC Walter Exploration Company Wapiti Operating, LLC Ward Petroleum Warren American Oil Company Warren E&P, Inc. Waterloo Exploration, LLC Wave Petroleum Operating, LLC WBH Energy Partners LLC WCT Operating, LLC Weaver Energy Corporation Weinkauf Petroleum, Inc. Weins Oil & Gas LLC Wellco Energy, Inc. Wellstar Corporation Wesco Operating, Inc. Western Chief Operating, LLC Western Oil and Gas Development Corp. Western Operating Company Western Production Co. Wexpro Company WFD Oil Corporation WG Operating, Inc. White Butte Oil Co. White Eagle Oil & Gas, LLC White Knight Production LLC White Rock Oil & Gas, LLC White Star Petroleum, LLC Whiting Petroleum Wicklund Petroleum, Inc. Wildhorse Operating Company WildHorse Resources LLC William H. Lackey Oil & Gas Operating Co. WILLIAMS OIL COMPANY Williford Energy Company Williston Hunter ND LLC Willowbend Investments, Inc. Windsor Permian LLC Windy Cove Energy II, LLC WN Operating, Inc. Wodbine Acquisition LLC Wolverine Gas & Oil Company of Utah, LLC Woodbine Acquisition LLC Woodbine Production Corp Woolsey Operating Co. LLC Woolsey Operating Company, LLC Worsham-Steed Gas Storage, LLC WP Oil, LLC WPX Energy Wynn-Crosby Operating, Ltd. Xanadu Exploration Company XPR Resources LLC XTO Energy/ExxonMobil Xtreme Energy Co. Yale Oil Association, Inc. Younger Energy Company Yucca Energy, Inc. Yuma E & P Company, Inc. Zargon Oil (ND) Inc. Zarvona Energy Zavanna, LLC Zenergy, Inc. 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