| 4901 | Cartex Production | Pampa, TX 79066 | Oil & Gas Operator | Sep 2026 |
| 4902 | Cartex Production Corp. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 4903 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | Jul 2026 |
| 4904 | Cartledge Energy LLC | Sapulpa, OK 74066-6623 | Oil & Gas Operator | Jun 2026 |
| 4905 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 4906 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 4907 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 4908 | Cary Oil & Gas, Inc | Decatur, TX 76234 | Oil & Gas Operator | Sep 2026 |
| 4909 | Casa Grande Exploration Company | Casa Grande, AZ 85194 | Oil & Gas Operator | Jul 2026 |
| 4910 | Casa Operations | Borger, TX 79007 | Oil & Gas Operator | Sep 2026 |
| 4911 | Cascade Oil (Dba) | Ness City, KS 67560 | Oil Operator | Mar 1998 |
| 4912 | Cascade Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 4913 | Cascade Petroleum Corporation | Quitman, TX 75783 | Oil & Gas Operator | Mar 2002 |
| 4914 | Cascade Petroleum Inc | North Canton, OH 44720-4244 | Oil & Gas Operator | Dec 1992 |
| 4915 | Cascade Resources LLC | Edmond, OK 73083 | Oil & Gas Operator | Jul 2026 |
| 4916 | Case Brothers Inc. | Limestone, NY 14753 | Oil & Gas Operator | Dec 2025 |
| 4917 | Case Drilling Company | Philpot, KY 42366 | Oil Operator | Dec 2020 |
| 4918 | Case Oil | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 4919 | Case Oil & Gas I | | Oil & Gas Operator | Apr 1992 |
| 4920 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 4921 | Case Sales Company Inc | Tonkawa, OK 74653-0040 | Oil & Gas Operator | Jun 2026 |
| 4922 | Case'S Used Equipment | | Oil & Gas Operator | Jun 2026 |
| 4923 | Case, C. W. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 4924 | Casebeer, Inc. | McPherson, KS 67460 | Oil Operator | May 2026 |
| 4925 | Casella Charles J | Avonmore, PA 15618-1028 | Oil & Gas Operator | Dec 2015 |
| 4926 | Casex Company | | Oil & Gas Operator | Dec 2007 |
| 4927 | Casey Musgrove Oil Company Inc | Ponca City, OK 74602 | Oil & Gas Operator | Jun 2026 |
| 4928 | Casey, Carl D | | Oil Operator | Sep 2024 |
| 4929 | Casey, W. J. | Fairfield, TX 75840 | Oil & Gas Operator | Sep 2026 |
| 4930 | Cash Flow Oil | | Oil Operator | Jul 2003 |
| 4931 | Cashco Energy Corporation | | Oil & Gas Operator | Feb 1982 |
| 4932 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 4933 | Cashco, L.L.C. | Houston, TX 77024 | Oil & Gas Operator | Jul 1999 |
| 4934 | Cashion, Lyle, Company | Brandon, MS 39047 | Oil & Gas Operator | May 2008 |
| 4935 | Casias Oil Well Service, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2020 |
| 4936 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Jun 2026 |
| 4937 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Jul 2026 |
| 4938 | Casino Petroleum | | Oil Operator | Dec 1996 |
| 4939 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Sep 2026 |
| 4940 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 4941 | Caspen Oil, Inc. | Lakewood, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 4942 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 4943 | Casper Oil & Gas | Bandera, TX 78003 | Oil & Gas Operator | Oct 2002 |
| 4944 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 4945 | Cass Energy LLC | MT Vernon, TX 75457 | Oil Operator | Sep 2026 |
| 4946 | Cassadaga Valley Central School | Sinclairville, NY 14782 | Gas Operator | Dec 2025 |
| 4947 | Casselman Charles Jack | Okmulgee, OK 74447-4265 | Oil & Gas Operator | Apr 2020 |
| 4948 | Casselman Leases LLC | Morris, OK 74445-2509 | Oil & Gas Operator | Jun 2026 |
| 4949 | Casselman Ronald H | Morris, OK 74445 | Oil & Gas Operator | Jun 2026 |
| 4950 | Casselman-Sheely | Emporia, KS 66801 | Oil & Gas Operator | Oct 2021 |
| 4951 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 4952 | Cassity Company | Wichita Falls, TX 76309 | Oil & Gas Operator | Jul 2013 |
| 4953 | Cassius Congdon Legacy, LLC | West Clarksville, NY 14786 | Oil & Gas Operator | Dec 2025 |
| 4954 | Casteel, Hoyt F. | Graham, TX 76450 | Oil & Gas Operator | Nov 2001 |
| 4955 | Castella Inc | Bartlesville, OK 74003-3712 | Oil & Gas Operator | Jul 2026 |
| 4956 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Jun 2026 |
| 4957 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 4958 | Castillo Oil Company LLC | Luling, TX 78648 | Oil & Gas Operator | Sep 2026 |
| 4959 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 4960 | Castle Gas Company Inc | Pittsburgh, PA 15236-2466 | Oil & Gas Operator | Dec 2007 |
| 4961 | Castle Gas Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2014 |
| 4962 | Castle Minerals | | Oil & Gas Operator | Dec 2018 |
| 4963 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Jun 2026 |
| 4964 | Castle Production Company | Henderson, TX 75652 | Oil & Gas Operator | May 1997 |
| 4965 | Castle Resources | | Oil Operator | Jul 2002 |
| 4966 | Castle Resources, Inc. | Russell, KS 67665 | Oil & Gas Operator | May 2026 |
| 4967 | Castle Rock Oil LLC | | Oil Operator | Jul 2026 |
| 4968 | Castlerock Ef Operating LLC | San Antonio, TX 78232 | Oil & Gas Operator | Sep 2026 |
| 4969 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 4970 | Castlerock Operating, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2020 |
| 4971 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 4972 | Castor Exploration, Inc. | | Oil & Gas Operator | Dec 1991 |
| 4973 | Castor Production, L.L.C. | | Oil Operator | Dec 2024 |
| 4974 | Caswell Bros. Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Sep 2026 |
| 4975 | Cat Canyon Resources LLC | | Oil & Gas Operator | Jul 2026 |
| 4976 | Cat Creek Holdings LLC | Winnett, MT 59087 | Oil Operator | Jun 2026 |
| 4977 | Cat Energy, LLC | Galva, KS 67443 | Oil Operator | Aug 2008 |
| 4978 | Cat Oil | Byron, WY 82412 | Oil Operator | May 2001 |
| 4979 | Cat-Oil Inc. | | Oil Operator | Nov 2015 |
| 4980 | Catalyst Energy Inc | Pittsburgh, PA 15218 | Oil & Gas Operator | Jun 2026 |
| 4981 | Catamount Energy Partners LLC | Denver, CO 80202 | Gas Operator | Jul 2026 |
| 4982 | Catamount Resources, Inc. | Grafton, WV 263540000 | Gas Operator | Dec 2009 |
| 4983 | Catarina Petroleum L. C. | Dallas, TX 75228 | Oil & Gas Operator | Jun 2008 |
| 4984 | Catena Resources Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2022 |
| 4985 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 4986 | Catfish Minerals LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 4987 | Catfish Oil | | Oil Operator | May 2026 |
| 4988 | Cather Rogers Barnes & Cree | | Oil & Gas Operator | Dec 2009 |
| 4989 | Cather, Barnes & Cree | | Oil & Gas Operator | Dec 2009 |
| 4990 | Cather-Herley Oil Company | | Oil & Gas Operator | Jul 2026 |
| 4991 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 4992 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 4993 | Cathey Petroleum Company, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Apr 2008 |
| 4994 | Cathey Production Company | Ryan, OK 73565-0485 | Oil Operator | Dec 2010 |
| 4995 | Caths Oil & Gas | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 4996 | Catlett & Ferguson-Carl O & G | | Oil & Gas Operator | Jun 1978 |
| 4997 | Catlin Drilling Company | Iowa Park, TX 76367 | Oil & Gas Operator | Aug 2003 |
| 4998 | Catlin, Carl | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 4999 | Catlin, Cecil | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 1995 |
| 5000 | Catlin, Cecil, Oil Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2000 |