| 5001 | Carter Donald L | Sand Springs, OK 74063-8105 | Oil Operator | May 2006 |
| 5002 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 5003 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 5004 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 5005 | Carter Oil And Gas Inc | Richmond, VA 23219 | Oil & Gas Operator | Dec 2011 |
| 5006 | Carter Oil Co | | Oil & Gas Operator | Dec 2013 |
| 5007 | Carter Preston Drilling Co | Davis, OK 73030 | Gas Operator | Nov 2000 |
| 5008 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 5009 | Carter, Calvin Gene | Sedan, KS 67361 | Oil Operator | Nov 2018 |
| 5010 | Carter, Eugene J. | Longton, KS 67352 | Oil Operator | Jan 1998 |
| 5011 | Carter, Gertrude (Trudy) | Rockwall, TX 75032 | Oil & Gas Operator | Apr 2013 |
| 5012 | Carter, Mattye Family Trust | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2002 |
| 5013 | Carter, Mattye L., Estate Of | Gladewater, TX 75647 | Oil & Gas Operator | Feb 1995 |
| 5014 | Carter, Shirley Oil Co | Round Rock, TX 78665 | Oil & Gas Operator | Jun 2018 |
| 5015 | Carter, Thomas J. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1995 |
| 5016 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jul 2025 |
| 5017 | Carter-Waters Corp. | | Oil Operator | Dec 1988 |
| 5018 | Cartex Production | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 5019 | Cartex Production Corp. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 5020 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | May 2025 |
| 5021 | Cartledge Energy LLC | Sapulpa, OK 74066-6623 | Oil & Gas Operator | May 2025 |
| 5022 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 5023 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 5024 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 5025 | Cary Oil & Gas, Inc | Decatur, TX 76234 | Oil & Gas Operator | Jul 2025 |
| 5026 | Casa Grande Exploration Company | Casa Grande, AZ 85194 | Oil & Gas Operator | Apr 2025 |
| 5027 | Casa Oil And Gas Company | George West, TX 78022 | Gas Operator | Sep 2005 |
| 5028 | Casa Operations | Borger, TX 79007 | Oil & Gas Operator | Jul 2025 |
| 5029 | Cascade Oil (Dba) | Ness City, KS 67560 | Oil Operator | Mar 1998 |
| 5030 | Cascade Oil And Gas, Inc | | Oil & Gas Operator | Jun 2005 |
| 5031 | Cascade Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 5032 | Cascade Petroleum Corporation | Quitman, TX 75783 | Oil & Gas Operator | Mar 2002 |
| 5033 | Cascade Petroleum Inc | North Canton, OH 44720-4244 | Oil & Gas Operator | Dec 1992 |
| 5034 | Cascade Petroleum LLC | | Oil & Gas Operator | Nov 2015 |
| 5035 | Cascade Resources LLC | Edmond, OK 73083 | Oil & Gas Operator | May 2025 |
| 5036 | Casco Energy, Inc. | Denison, TX 75020 | Oil & Gas Operator | May 1996 |
| 5037 | Case Brothers Inc. | Limestone, NY 14753 | Oil & Gas Operator | Dec 2024 |
| 5038 | Case Drilling Company | Philpot, KY 42366 | Oil Operator | Dec 2019 |
| 5039 | Case Oil | Burkburnett, TX 76354 | Oil & Gas Operator | Jul 2025 |
| 5040 | Case Oil & Gas I | | Oil & Gas Operator | Apr 1992 |
| 5041 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 5042 | Case Sales Company Inc | Tonkawa, OK 74653-0040 | Oil & Gas Operator | Apr 2025 |
| 5043 | Case'S Used Equipment | | Oil & Gas Operator | May 2025 |
| 5044 | Case, C. W. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 5045 | Casebeer, Inc. | McPherson, KS 67460 | Oil Operator | Mar 2025 |
| 5046 | Casella Charles J | Avonmore, PA 15618-1028 | Oil & Gas Operator | Dec 2015 |
| 5047 | Casex Company | | Oil & Gas Operator | Dec 2007 |
| 5048 | Casey Musgrove Oil Company Inc | Ponca City, OK 74602 | Oil & Gas Operator | Apr 2025 |
| 5049 | Casey, Carl D | | Oil Operator | Sep 2024 |
| 5050 | Casey, W. J. | Fairfield, TX 75840 | Oil & Gas Operator | Jul 2025 |
| 5051 | Cash Flow Oil | | Oil Operator | Jul 2003 |
| 5052 | Cashco Energy Corporation | | Oil & Gas Operator | Feb 1982 |
| 5053 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 5054 | Cashco, L.L.C. | Houston, TX 77024 | Oil & Gas Operator | Jul 1999 |
| 5055 | Cashion, Lyle, Company | Brandon, MS 39047 | Oil & Gas Operator | May 2008 |
| 5056 | Casias Oil Well Service, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2020 |
| 5057 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Apr 2025 |
| 5058 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | May 2025 |
| 5059 | Casino Petroleum | | Oil Operator | Dec 1996 |
| 5060 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Jul 2025 |
| 5061 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 5062 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 5063 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 5064 | Casper Oil & Gas | Bandera, TX 78003 | Oil & Gas Operator | Oct 2002 |
| 5065 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 5066 | Cass Energy LLC | MT Vernon, TX 75457 | Oil Operator | Jul 2025 |
| 5067 | Cassadaga Valley Central School | Sinclairville, NY 14782 | Gas Operator | Dec 2024 |
| 5068 | Casselman Charles Jack | Okmulgee, OK 74447-4265 | Oil & Gas Operator | Apr 2020 |
| 5069 | Casselman Leases LLC | Morris, OK 74445-2509 | Oil & Gas Operator | Apr 2025 |
| 5070 | Casselman Ronald H | Morris, OK 74445 | Oil & Gas Operator | Apr 2025 |
| 5071 | Casselman-Sheely | Emporia, KS 66801 | Oil & Gas Operator | Oct 2021 |
| 5072 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 5073 | Cassity Company | Wichita Falls, TX 76309 | Oil & Gas Operator | Jul 2013 |
| 5074 | Cassius Congdon Legacy, LLC | West Clarksville, NY 14786 | Oil & Gas Operator | Dec 2024 |
| 5075 | Casteel, Hoyt F. | Graham, TX 76450 | Oil & Gas Operator | Nov 2001 |
| 5076 | Castella Inc | Bartlesville, OK 74003-3712 | Oil & Gas Operator | May 2025 |
| 5077 | Castelli Exploration, Inc. | Oklahoma City, OK 73162 | Oil & Gas Operator | Apr 2025 |
| 5078 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 5079 | Castillo Oil Company LLC | Luling, TX 78648 | Oil & Gas Operator | Jul 2025 |
| 5080 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 5081 | Castle Gas Company Inc | Pittsburgh, PA 15236-2466 | Oil & Gas Operator | Dec 2007 |
| 5082 | Castle Gas Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2014 |
| 5083 | Castle Minerals | | Oil & Gas Operator | Dec 2018 |
| 5084 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Apr 2025 |
| 5085 | Castle Production Company | Henderson, TX 75652 | Oil & Gas Operator | May 1997 |
| 5086 | Castle Resources | | Oil Operator | Jul 2002 |
| 5087 | Castle Resources, Inc. | Russell, KS 67665 | Oil & Gas Operator | Mar 2025 |
| 5088 | Castle Rock Oil LLC | | Oil Operator | Jun 2025 |
| 5089 | Castle-Rock Prod | | Oil Operator | Mar 1992 |
| 5090 | Castlerock Ef Operating LLC | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2025 |
| 5091 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 5092 | Castlerock Operating, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2020 |
| 5093 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 5094 | Castor Exploration, Inc. | | Oil & Gas Operator | Dec 1991 |
| 5095 | Castor Production, L.L.C. | | Oil Operator | Dec 2024 |
| 5096 | Caswell Bros. Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Jul 2025 |
| 5097 | Cat Canyon Resources LLC | | Oil & Gas Operator | Apr 2025 |
| 5098 | Cat Creek Holdings LLC | Winnett, MT 59087 | Oil Operator | May 2025 |
| 5099 | Cat Energy, LLC | Galva, KS 67443 | Oil Operator | Aug 2008 |
| 5100 | Cat Oil | Byron, WY 82412 | Oil Operator | May 2001 |