| 6001 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Feb 2026 |
| 6002 | Cody Operating, Inc. | | Oil & Gas Operator | Jan 2026 |
| 6003 | Cody Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Sep 2002 |
| 6004 | Cody, Ken L. | Longton, KS 67352 | Oil & Gas Operator | Oct 2025 |
| 6005 | Cody, Nancy M. | Fredonia, KS 66736 | Oil Operator | Jun 1998 |
| 6006 | Cody, Patricia H | | Oil & Gas Operator | Nov 2007 |
| 6007 | Coe Production Company | Talala, OK 74080-0264 | Oil & Gas Operator | Aug 2015 |
| 6008 | Coe Production Company LLC | Talala, OK 74080 | Oil Operator | Jan 2026 |
| 6009 | Coelho & Case Oil Company | | Oil & Gas Operator | Dec 1997 |
| 6010 | Coen Energy | | Oil Operator | Mar 1995 |
| 6011 | Coen Energy Corporation | Overland Park, KS 66221 | Oil Operator | Dec 2025 |
| 6012 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 6013 | Coert Holdings 1 LLC | Greenwich, CT 06830 | Oil & Gas Operator | Dec 2021 |
| 6014 | Cofer & Co LLC | Hobbs, NM 88240 | Oil & Gas Operator | Jan 2026 |
| 6015 | Cofer & Crawford | Pampa, TX 79066 | Oil & Gas Operator | Jan 2026 |
| 6016 | Coffee Petroleum | | Oil & Gas Operator | Feb 2026 |
| 6017 | Coffman Oil & Gas | | Oil & Gas Operator | Dec 1999 |
| 6018 | Coffman Oil & Real Estate Inc | Newport Beach, CA 92661 | Oil Operator | Dec 2024 |
| 6019 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2026 |
| 6020 | COG Petroleum Corporation | Oklahoma City, OK 73116-7326 | Oil & Gas Operator | Mar 2019 |
| 6021 | COG Production LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 6022 | Cogburn Oil Co Inc | | Oil & Gas Operator | Jan 2026 |
| 6023 | Cohen & Kosovitz | | Oil & Gas Operator | May 1998 |
| 6024 | Coho Louisiana Production Co | | Gas Operator | Dec 1998 |
| 6025 | Coho Oil & Gas Inc | Coppell, TX 75019-8288 | Oil & Gas Operator | Mar 2015 |
| 6026 | Coho Resources Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2002 |
| 6027 | Cohort Energy Company | Centennial, CO 80112 | Oil & Gas Operator | Feb 2007 |
| 6028 | Cokan Resources | Colby, KS 67701 | Oil Operator | Aug 1994 |
| 6029 | Coker Oil Company | Duncan, OK 73533-0818 | Oil Operator | Jan 2014 |
| 6030 | Coker, Jonathan C., Inc. | Austin, TX 78746 | Oil Operator | Mar 2011 |
| 6031 | Coker, Nel Rey Daws | Throckmorton, TX 76483 | Oil & Gas Operator | Mar 2008 |
| 6032 | Coker, Tom | Seymour, TX 76380 | Oil & Gas Operator | Sep 2006 |
| 6033 | Cokinos, Inc. | Beaumont, TX 77701 | Oil & Gas Operator | Aug 2003 |
| 6034 | Col-Kan Developm | | Oil & Gas Operator | Jan 1995 |
| 6035 | Col-Kan Development, Inc. | Russell, KS 67665 | Oil Operator | Jul 2005 |
| 6036 | Cola Resources LLC | Houston, TX 77019-5639 | Gas Operator | Nov 2015 |
| 6037 | Colby Production Resources, LLC | Granbury, TX 76048 | Oil Operator | Dec 2025 |
| 6038 | Coldren Oil & Gas Inc | Bartlesville, OK 74006-4729 | Oil & Gas Operator | Sep 1998 |
| 6039 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 6040 | Cole, John Otis | Big Spring, TX 79721 | Oil & Gas Operator | Jan 1999 |
| 6041 | Coleman & Johnson Oil Company | Brownwood, TX 76801 | Oil & Gas Operator | May 2026 |
| 6042 | Coleman County Project | Coleman, TX 76834 | Oil & Gas Operator | Oct 2012 |
| 6043 | Coleman Oil & Gas Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | May 2026 |
| 6044 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 6045 | Coleman Oil Company | Bartlesville, OK 74003 | Oil Operator | Dec 2024 |
| 6046 | Coleman Oil LLC | Marlow, OK 73055 | Oil Operator | Nov 2021 |
| 6047 | Coleman Production | Stroud, OK 74079-9609 | Oil & Gas Operator | May 2013 |
| 6048 | Coleman, C R | | Gas Operator | Dec 2007 |
| 6049 | Colemanite, Inc. | Abilene, TX 79606 | Oil & Gas Operator | May 2026 |
| 6050 | Coleville Petroleum Company | McAllen, TX 78503 | Oil & Gas Operator | Mar 1996 |
| 6051 | Coley, H. B. | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2000 |
| 6052 | Coley, Thomas | Graham, TX 76450 | Oil & Gas Operator | May 2026 |
| 6053 | Colgate Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 6054 | Colgrade Investment Corp. | | Oil Operator | Apr 2004 |
| 6055 | Collet Oil Ventures Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 6056 | Collier Oil Field Services Inc | Iowa Park, TX 76367 | Oil & Gas Operator | May 2026 |
| 6057 | Collier Oil Prop | | Oil Operator | Apr 1987 |
| 6058 | Collier Petroleum Corporation | Taloga, OK 73667-9644 | Oil & Gas Operator | Jan 2013 |
| 6059 | Collier, Scott Inc. | Holliday, TX 76366 | Oil Operator | May 2003 |
| 6060 | Collier, W. D. Ranch | Post, TX 79356 | Oil & Gas Operator | Jan 2012 |
| 6061 | Collin C W Jr | | Oil Operator | Oct 2015 |
| 6062 | Collin Oil Operations LLC | | Oil Operator | Dec 2025 |
| 6063 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 6064 | Collins Associates Inc | | Oil & Gas Operator | Mar 1987 |
| 6065 | Collins C R And Collins F Dba Collins Brothers Oil | | Oil & Gas Operator | Jul 2008 |
| 6066 | Collins Dillard Dba Dilco Oil Company | Mangum, OK 73554-4029 | Oil & Gas Operator | Mar 2025 |
| 6067 | Collins John B | | Oil Operator | Sep 1994 |
| 6068 | Collins Oil & Gas Corp | Roswell, NM 88202 | Oil & Gas Operator | Jul 2017 |
| 6069 | Collins Oil Co. | Bartlesville, OK 74006 | Oil & Gas Operator | Dec 2024 |
| 6070 | Collins Oil Comp | | Oil Operator | Apr 1995 |
| 6071 | Collins Oil, LLC | Ellinwood, KS 67526 | Oil Operator | Dec 2025 |
| 6072 | Collins Petroleum Inc | Bartlesville, OK 74006-7024 | Oil & Gas Operator | Apr 2005 |
| 6073 | Collins Resources, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2011 |
| 6074 | Collins, Dave | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2024 |
| 6075 | Collins, David A And Cole, Alexander B. | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2024 |
| 6076 | Collins, Paul | Big Springs, WV 26137-0000 | Oil & Gas Operator | Dec 2021 |
| 6077 | Collins, Stephen M | | Oil Operator | Feb 2026 |
| 6078 | Collins-McGregor Operating Company | Marietta, OH 45750 | Oil & Gas Operator | Dec 2025 |
| 6079 | Colo Construction Co., Inc. | Abilene, TX 79602 | Oil Operator | Apr 2004 |
| 6080 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | May 2026 |
| 6081 | Cologne Production Company | San Antonio, TX 78209 | Oil & Gas Operator | Nov 2014 |
| 6082 | Colonial Corporation | St Simons Island, GA 31522 | Oil & Gas Operator | Dec 2000 |
| 6083 | Colonial Energy Company Inc | Garland, TN 75045 | Oil & Gas Operator | Apr 2015 |
| 6084 | Colonial Resources LLC | Edmond, OK 73003-3207 | Oil & Gas Operator | Aug 2019 |
| 6085 | Colorado Bluebonnet Energy Corp. | Englewood, CO 80112 | Oil & Gas Operator | Feb 2001 |
| 6086 | Colorado Crude E | | Oil Operator | Jan 1986 |
| 6087 | Colorado Drilling Company | Grand Junction, CO 81501 | Oil Operator | Jan 1990 |
| 6088 | Colorado Gas Compression Inc | Longmont, CO 80501-5868 | Oil & Gas Operator | Aug 2013 |
| 6089 | Colorado Interstate Gas Co | Colorado Springs, CO 80944 | Oil & Gas Operator | Jul 2004 |
| 6090 | Colorado Interstate Gas Company LLC | Colorado Springs, CO 80944 | Oil & Gas Operator | Jan 2026 |
| 6091 | Colorado Oil & G | | Oil & Gas Operator | Oct 1987 |
| 6092 | Colorado Oil & Gas Corporation | | Oil & Gas Operator | Sep 1984 |
| 6093 | Colorado Oil Co., Inc. | | Oil & Gas Operator | Dec 1977 |
| 6094 | Colorado Pica Petro Corp | Cortez, CO 81321 | Oil & Gas Operator | Apr 2007 |
| 6095 | Colorado-Swanson Landing Oil & Gas, LLC | Kilgore, TX 75663 | Oil Operator | May 2026 |
| 6096 | Colossus Operating LLC | Kalispell, MT 59901 | Oil Operator | Dec 2025 |
| 6097 | Colotex Operating, LLC | Aurora, CO 80015 | Oil & Gas Operator | May 2026 |
| 6098 | Colpitt Brothers Oil | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2020 |
| 6099 | Colpitt Brothers Operating Co | Collinsville, OK 74021 | Oil & Gas Operator | Jan 2026 |
| 6100 | Colpitt C H Drilling Co LLC | Collinsville, OK 74021-7107 | Oil Operator | Feb 2026 |