| 5101 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 5102 | Carter, Calvin Gene | Sedan, KS 67361 | Oil Operator | Nov 2018 |
| 5103 | Carter, Eugene J. | Longton, KS 67352 | Oil Operator | Jan 1998 |
| 5104 | Carter, Gertrude (Trudy) | Rockwall, TX 75032 | Oil & Gas Operator | Apr 2013 |
| 5105 | Carter, Mattye Family Trust | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2002 |
| 5106 | Carter, Mattye L., Estate Of | Gladewater, TX 75647 | Oil & Gas Operator | Feb 1995 |
| 5107 | Carter, Shirley Oil Co | Round Rock, TX 78665 | Oil & Gas Operator | Jun 2018 |
| 5108 | Carter, Thomas J. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1995 |
| 5109 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 5110 | Carter-Waters Corp. | | Oil Operator | Dec 1988 |
| 5111 | Cartex Production | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 5112 | Cartex Production Corp. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 5113 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | Oct 2025 |
| 5114 | Cartledge Energy LLC | Sapulpa, OK 74066-6623 | Oil & Gas Operator | Oct 2025 |
| 5115 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 5116 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 5117 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 5118 | Cary Oil & Gas, Inc | Decatur, TX 76234 | Oil & Gas Operator | Feb 2026 |
| 5119 | Casa Grande Exploration Company | Casa Grande, AZ 85194 | Oil & Gas Operator | Nov 2025 |
| 5120 | Casa Oil And Gas Company | George West, TX 78022 | Gas Operator | Sep 2005 |
| 5121 | Casa Operations | Borger, TX 79007 | Oil & Gas Operator | Feb 2026 |
| 5122 | Cascade Oil (Dba) | Ness City, KS 67560 | Oil Operator | Mar 1998 |
| 5123 | Cascade Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 5124 | Cascade Petroleum Corporation | Quitman, TX 75783 | Oil & Gas Operator | Mar 2002 |
| 5125 | Cascade Petroleum Inc | North Canton, OH 44720-4244 | Oil & Gas Operator | Dec 1992 |
| 5126 | Cascade Resources LLC | Edmond, OK 73083 | Oil & Gas Operator | Nov 2025 |
| 5127 | Casco Energy, Inc. | Denison, TX 75020 | Oil & Gas Operator | May 1996 |
| 5128 | Case Brothers Inc. | Limestone, NY 14753 | Oil & Gas Operator | Dec 2024 |
| 5129 | Case Drilling Company | Philpot, KY 42366 | Oil Operator | Dec 2019 |
| 5130 | Case Oil | Burkburnett, TX 76354 | Oil & Gas Operator | Feb 2026 |
| 5131 | Case Oil & Gas I | | Oil & Gas Operator | Apr 1992 |
| 5132 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 5133 | Case Sales Company Inc | Tonkawa, OK 74653-0040 | Oil & Gas Operator | Nov 2025 |
| 5134 | Case'S Used Equipment | | Oil & Gas Operator | Oct 2025 |
| 5135 | Case, C. W. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 5136 | Casebeer, Inc. | McPherson, KS 67460 | Oil Operator | Sep 2025 |
| 5137 | Casella Charles J | Avonmore, PA 15618-1028 | Oil & Gas Operator | Dec 2015 |
| 5138 | Casex Company | | Oil & Gas Operator | Dec 2007 |
| 5139 | Casey Musgrove Oil Company Inc | Ponca City, OK 74602 | Oil & Gas Operator | Oct 2025 |
| 5140 | Casey, Carl D | | Oil Operator | Sep 2024 |
| 5141 | Casey, W. J. | Fairfield, TX 75840 | Oil & Gas Operator | Feb 2026 |
| 5142 | Cash Flow Oil | | Oil Operator | Jul 2003 |
| 5143 | Cashco Energy Corporation | | Oil & Gas Operator | Feb 1982 |
| 5144 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 5145 | Cashco, L.L.C. | Houston, TX 77024 | Oil & Gas Operator | Jul 1999 |
| 5146 | Cashion, Lyle, Company | Brandon, MS 39047 | Oil & Gas Operator | May 2008 |
| 5147 | Casias Oil Well Service, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2020 |
| 5148 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Oct 2025 |
| 5149 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Nov 2025 |
| 5150 | Casino Petroleum | | Oil Operator | Dec 1996 |
| 5151 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 5152 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 5153 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 5154 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 5155 | Casper Oil & Gas | Bandera, TX 78003 | Oil & Gas Operator | Oct 2002 |
| 5156 | Cass Donna Marie | North East, PA 16428-5530 | Gas Operator | Dec 2019 |
| 5157 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 5158 | Cass Energy LLC | MT Vernon, TX 75457 | Oil Operator | Feb 2026 |
| 5159 | Cassadaga Valley Central School | Sinclairville, NY 14782 | Gas Operator | Dec 2024 |
| 5160 | Casselman Charles Jack | Okmulgee, OK 74447-4265 | Oil & Gas Operator | Apr 2020 |
| 5161 | Casselman Leases LLC | Morris, OK 74445-2509 | Oil & Gas Operator | Sep 2025 |
| 5162 | Casselman Ronald H | Morris, OK 74445 | Oil & Gas Operator | Oct 2025 |
| 5163 | Casselman-Sheely | Emporia, KS 66801 | Oil & Gas Operator | Oct 2021 |
| 5164 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 5165 | Cassity Company | Wichita Falls, TX 76309 | Oil & Gas Operator | Jul 2013 |
| 5166 | Cassius Congdon Legacy, LLC | West Clarksville, NY 14786 | Oil & Gas Operator | Dec 2024 |
| 5167 | Casteel, Hoyt F. | Graham, TX 76450 | Oil & Gas Operator | Nov 2001 |
| 5168 | Castella Inc | Bartlesville, OK 74003-3712 | Oil & Gas Operator | Nov 2025 |
| 5169 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Oct 2025 |
| 5170 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 5171 | Castillo Oil Company LLC | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 5172 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 5173 | Castle Gas Company Inc | Pittsburgh, PA 15236-2466 | Oil & Gas Operator | Dec 2007 |
| 5174 | Castle Gas Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2014 |
| 5175 | Castle Minerals | | Oil & Gas Operator | Dec 2018 |
| 5176 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Oct 2025 |
| 5177 | Castle Production Company | Henderson, TX 75652 | Oil & Gas Operator | May 1997 |
| 5178 | Castle Resources | | Oil Operator | Jul 2002 |
| 5179 | Castle Resources, Inc. | Russell, KS 67665 | Oil & Gas Operator | Sep 2025 |
| 5180 | Castle Rock Oil LLC | | Oil Operator | Nov 2025 |
| 5181 | Castle-Rock Prod | | Oil Operator | Mar 1992 |
| 5182 | Castlerock Ef Operating LLC | San Antonio, TX 78232 | Oil & Gas Operator | Feb 2026 |
| 5183 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 5184 | Castlerock Operating, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2020 |
| 5185 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 5186 | Castor Exploration, Inc. | | Oil & Gas Operator | Dec 1991 |
| 5187 | Castor Production, L.L.C. | | Oil Operator | Dec 2024 |
| 5188 | Caswell Bros. Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Feb 2026 |
| 5189 | Cat Canyon Resources LLC | | Oil & Gas Operator | Oct 2025 |
| 5190 | Cat Creek Holdings LLC | Winnett, MT 59087 | Oil Operator | Nov 2025 |
| 5191 | Cat Energy, LLC | Galva, KS 67443 | Oil Operator | Aug 2008 |
| 5192 | Cat Oil | Byron, WY 82412 | Oil Operator | May 2001 |
| 5193 | Cat-Oil Inc. | | Oil Operator | Nov 2015 |
| 5194 | Catalyst Energy Inc | Pittsburgh, PA 15218 | Oil & Gas Operator | Nov 2025 |
| 5195 | Catamount Energy Partners LLC | Denver, CO 80202 | Gas Operator | Dec 2025 |
| 5196 | Catamount Resources, Inc. | Grafton, WV 26354-0000 | Gas Operator | Dec 2009 |
| 5197 | Catarina Petroleum L. C. | Dallas, TX 75228 | Oil & Gas Operator | Jun 2008 |
| 5198 | Catena Resources Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2022 |
| 5199 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 5200 | Catfish Minerals LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |