| 4901 | Carson Assoc, Inc | Ashland, KY 41102 | Oil & Gas Operator | Dec 2013 |
| 4902 | Carson Buckles Exploration LLC | Amarillo, TX 79159 | Oil & Gas Operator | Aug 2026 |
| 4903 | Carson Dominguez Real Est Corp | | Oil & Gas Operator | Dec 1996 |
| 4904 | Carstan Petroleu | | Oil Operator | May 1983 |
| 4905 | Cart Hill Energy, LLC | Hobbs, NM 88240 | Oil & Gas Operator | Apr 2026 |
| 4906 | Carter & Rorex | | Oil Operator | Dec 1991 |
| 4907 | Carter Cattle & Crude Company | Luling, TX 78648 | Oil & Gas Operator | Aug 2026 |
| 4908 | Carter County Salt Water Disposal Inc | Wilson, OK 73463 | Oil Operator | Apr 2026 |
| 4909 | Carter Donald L | Sand Springs, OK 74063-8105 | Oil Operator | May 2006 |
| 4910 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 4911 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 4912 | Carter Exploration Company | Corpus Christ, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 4913 | Carter Oil And Gas Inc | Richmond, VA 23219 | Oil & Gas Operator | Dec 2011 |
| 4914 | Carter Oil Co | | Oil & Gas Operator | Dec 2013 |
| 4915 | Carter Preston Drilling Co | Davis, OK 73030 | Gas Operator | Nov 2000 |
| 4916 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 4917 | Carter, Calvin Gene | Sedan, KS 67361 | Oil Operator | Nov 2018 |
| 4918 | Carter, Eugene J. | Longton, KS 67352 | Oil Operator | Jan 1998 |
| 4919 | Carter, Gertrude (Trudy) | Rockwall, TX 75032 | Oil & Gas Operator | Apr 2013 |
| 4920 | Carter, Mattye Family Trust | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2002 |
| 4921 | Carter, Mattye L., Estate Of | Gladewater, TX 75647 | Oil & Gas Operator | Feb 1995 |
| 4922 | Carter, Shirley Oil Co | Round Rock, TX 78665 | Oil & Gas Operator | Jun 2018 |
| 4923 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Aug 2026 |
| 4924 | Carter-Waters Corp. | | Oil Operator | Dec 1988 |
| 4925 | Cartex Production | Pampa, TX 79066 | Oil & Gas Operator | Aug 2026 |
| 4926 | Cartex Production Corp. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 4927 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | May 2026 |
| 4928 | Cartledge Energy LLC | Sapulpa, OK 74066-6623 | Oil & Gas Operator | Apr 2026 |
| 4929 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 4930 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 4931 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 4932 | Cary Oil & Gas, Inc | Decatur, TX 76234 | Oil & Gas Operator | Aug 2026 |
| 4933 | Casa Grande Exploration Company | Casa Grande, AZ 85194 | Oil & Gas Operator | May 2026 |
| 4934 | Casa Operations | Borger, TX 79007 | Oil & Gas Operator | Aug 2026 |
| 4935 | Cascade Oil (Dba) | Ness City, KS 67560 | Oil Operator | Mar 1998 |
| 4936 | Cascade Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 4937 | Cascade Petroleum Corporation | Quitman, TX 75783 | Oil & Gas Operator | Mar 2002 |
| 4938 | Cascade Petroleum Inc | North Canton, OH 44720-4244 | Oil & Gas Operator | Dec 1992 |
| 4939 | Cascade Resources LLC | Edmond, OK 73083 | Oil & Gas Operator | Jun 2026 |
| 4940 | Case Brothers Inc. | Limestone, NY 14753 | Oil & Gas Operator | Dec 2025 |
| 4941 | Case Drilling Company | Philpot, KY 42366 | Oil Operator | Dec 2020 |
| 4942 | Case Oil | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2026 |
| 4943 | Case Oil & Gas I | | Oil & Gas Operator | Apr 1992 |
| 4944 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Aug 2026 |
| 4945 | Case Sales Company Inc | Tonkawa, OK 74653-0040 | Oil & Gas Operator | Apr 2026 |
| 4946 | Case'S Used Equipment | | Oil & Gas Operator | May 2026 |
| 4947 | Case, C. W. | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2026 |
| 4948 | Casebeer, Inc. | McPherson, KS 67460 | Oil Operator | Apr 2026 |
| 4949 | Casella Charles J | Avonmore, PA 15618-1028 | Oil & Gas Operator | Dec 2015 |
| 4950 | Casex Company | | Oil & Gas Operator | Dec 2007 |
| 4951 | Casey Musgrove Oil Company Inc | Ponca City, OK 74602 | Oil & Gas Operator | May 2026 |
| 4952 | Casey, Carl D | | Oil Operator | Sep 2024 |
| 4953 | Casey, W. J. | Fairfield, TX 75840 | Oil & Gas Operator | Aug 2026 |
| 4954 | Cash Flow Oil | | Oil Operator | Jul 2003 |
| 4955 | Cashco Energy Corporation | | Oil & Gas Operator | Feb 1982 |
| 4956 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 4957 | Cashco, L.L.C. | Houston, TX 77024 | Oil & Gas Operator | Jul 1999 |
| 4958 | Cashion, Lyle, Company | Brandon, MS 39047 | Oil & Gas Operator | May 2008 |
| 4959 | Casias Oil Well Service, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2020 |
| 4960 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Apr 2026 |
| 4961 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | May 2026 |
| 4962 | Casino Petroleum | | Oil Operator | Dec 1996 |
| 4963 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Aug 2026 |
| 4964 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 4965 | Caspen Oil, Inc. | Lakewood, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 4966 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 4967 | Casper Oil & Gas | Bandera, TX 78003 | Oil & Gas Operator | Oct 2002 |
| 4968 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 4969 | Cass Energy LLC | MT Vernon, TX 75457 | Oil Operator | Aug 2026 |
| 4970 | Cassadaga Valley Central School | Sinclairville, NY 14782 | Gas Operator | Dec 2025 |
| 4971 | Casselman Charles Jack | Okmulgee, OK 74447-4265 | Oil & Gas Operator | Apr 2020 |
| 4972 | Casselman Leases LLC | Morris, OK 74445-2509 | Oil & Gas Operator | Apr 2026 |
| 4973 | Casselman Ronald H | Morris, OK 74445 | Oil & Gas Operator | Apr 2026 |
| 4974 | Casselman-Sheely | Emporia, KS 66801 | Oil & Gas Operator | Oct 2021 |
| 4975 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 4976 | Cassity Company | Wichita Falls, TX 76309 | Oil & Gas Operator | Jul 2013 |
| 4977 | Cassius Congdon Legacy, LLC | West Clarksville, NY 14786 | Oil & Gas Operator | Dec 2025 |
| 4978 | Casteel, Hoyt F. | Graham, TX 76450 | Oil & Gas Operator | Nov 2001 |
| 4979 | Castella Inc | Bartlesville, OK 74003-3712 | Oil & Gas Operator | Apr 2026 |
| 4980 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Apr 2026 |
| 4981 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2026 |
| 4982 | Castillo Oil Company LLC | Luling, TX 78648 | Oil & Gas Operator | Aug 2026 |
| 4983 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 4984 | Castle Gas Company Inc | Pittsburgh, PA 15236-2466 | Oil & Gas Operator | Dec 2007 |
| 4985 | Castle Gas Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2014 |
| 4986 | Castle Minerals | | Oil & Gas Operator | Dec 2018 |
| 4987 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Apr 2026 |
| 4988 | Castle Production Company | Henderson, TX 75652 | Oil & Gas Operator | May 1997 |
| 4989 | Castle Resources | | Oil Operator | Jul 2002 |
| 4990 | Castle Resources, Inc. | Russell, KS 67665 | Oil & Gas Operator | Apr 2026 |
| 4991 | Castle Rock Oil LLC | | Oil Operator | May 2026 |
| 4992 | Castlerock Ef Operating LLC | San Antonio, TX 78232 | Oil & Gas Operator | Aug 2026 |
| 4993 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 4994 | Castlerock Operating, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2020 |
| 4995 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 4996 | Castor Exploration, Inc. | | Oil & Gas Operator | Dec 1991 |
| 4997 | Castor Production, L.L.C. | | Oil Operator | Dec 2024 |
| 4998 | Caswell Bros. Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Aug 2026 |
| 4999 | Cat Canyon Resources LLC | | Oil & Gas Operator | Jun 2026 |
| 5000 | Cat Creek Holdings LLC | Winnett, MT 59087 | Oil Operator | May 2026 |