| 5601 | Christian Operating Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2014 |
| 5602 | Christian Well Service | | Oil & Gas Operator | May 1987 |
| 5603 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Nov 2024 |
| 5604 | Christie Jr C B | Wichita Falls, TX 76308-4873 | Oil & Gas Operator | May 2024 |
| 5605 | Christie Oil Co., Inc | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1996 |
| 5606 | Christie, C. B., Jr. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2014 |
| 5607 | Christine Marie Exploration LP | Indiana, PA 15701-0515 | Oil & Gas Operator | Dec 2023 |
| 5608 | Christman Rosalie | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2023 |
| 5609 | Christmann Energy Corp. | | Oil & Gas Operator | Feb 1991 |
| 5610 | Christmann John J | Lubbock, TX 79401 | Oil & Gas Operator | Dec 1994 |
| 5611 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 5612 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 5613 | CHS McPherson Refinery Inc | Platteville, CO 80651 | Oil & Gas Operator | Apr 1994 |
| 5614 | Chuck Henry Energy LLC | Wellsville, NY 14895 | Oil Operator | Dec 2023 |
| 5615 | Chumley, George Estate Of | Alice, TX 78333 | Oil & Gas Operator | Nov 2024 |
| 5616 | Church Ranch, LLC | Lubbock, TX 79423 | Oil Operator | Nov 2024 |
| 5617 | Church, Steve | Philpot, KY 42366 | Oil & Gas Operator | Dec 2022 |
| 5618 | Churchill Energy Inc | | Oil & Gas Operator | Sep 2020 |
| 5619 | Churchill Operating, LLC | Houston, TX 77007 | Oil & Gas Operator | Nov 2024 |
| 5620 | Chute Ray C | Logan, OH 43138 | Oil & Gas Operator | Dec 2014 |
| 5621 | Chuza Oil Company | Farmington, NM 87402 | Oil Operator | Dec 2017 |
| 5622 | Chuza Operating | Midland, TX 79710 | Oil & Gas Operator | Sep 2006 |
| 5623 | Cibco Resources, LLC | | Oil & Gas Operator | Jun 2024 |
| 5624 | Cibola Energy Corporation | Albuquerque, NM 87103 | Oil & Gas Operator | Oct 2017 |
| 5625 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | Nov 2024 |
| 5626 | Cibolo Production, LLC | Boerne, TX 78006 | Oil Operator | Jan 2020 |
| 5627 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 5628 | Ciera Resources, Inc. | | Gas Operator | Nov 1998 |
| 5629 | Ciervo Resources Asset Holding, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2024 |
| 5630 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 5631 | Cig Exploration Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 1999 |
| 5632 | Cig Resources Company | Colorado Spring, CO 80944-1087 | Oil & Gas Operator | Jun 2018 |
| 5633 | Cigna Energy Resources Inc | Englewood, CO 80155-5038 | Oil Operator | Nov 1998 |
| 5634 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 5635 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 5636 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 5637 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Nov 2024 |
| 5638 | Cimarron Management Corp | | Oil & Gas Operator | Jul 2020 |
| 5639 | Cimarron Oil & Gas Inc | Perry, OK 73077-1318 | Oil & Gas Operator | Sep 2000 |
| 5640 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 5641 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Aug 2024 |
| 5642 | Cimarron Production Co Inc | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Aug 2024 |
| 5643 | Cimarron Properties, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Nov 1997 |
| 5644 | Cimarron River Operating Co | Mannford, OK 74044 | Oil & Gas Operator | Sep 2024 |
| 5645 | Cimarron Valley Energy Inc | Stillwater, OK 74076 | Oil Operator | Apr 2015 |
| 5646 | Cimic Energy, LLC | | Oil Operator | Jun 2024 |
| 5647 | Ciminello, Angeline | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 5648 | Cinab, Inc. | FT. Scott, KS 66701 | Oil Operator | Jan 1998 |
| 5649 | Cinco Exploratio | | Oil & Gas Operator | Jan 1988 |
| 5650 | Cinco General Partnership | Albuquerque, NM 87103 | Oil & Gas Operator | Oct 1999 |
| 5651 | Cinco Natural Resources Corp | La Grange, TX 78945 | Oil & Gas Operator | Nov 2024 |
| 5652 | Cinco Oil & Gas, LLC | Dallas, TX 75204 | Oil & Gas Operator | Nov 2024 |
| 5653 | Cincris Energy C | | Oil & Gas Operator | Jun 1991 |
| 5654 | Cinder Production Company | | Oil & Gas Operator | Apr 2014 |
| 5655 | Cinnabar Energy, LTD. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2018 |
| 5656 | Cinnabar Operating, LLC | Fort Worth, TX 76121 | Oil & Gas Operator | Nov 2024 |
| 5657 | Cinnamon Creek Oil & Gas Inc | | Oil Operator | Sep 2024 |
| 5658 | Cinron Energy, LLC | Arp, TX 75750 | Oil & Gas Operator | Nov 2024 |
| 5659 | Circle "M" Energy Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 2003 |
| 5660 | Circle 9 Resources LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Sep 2024 |
| 5661 | Circle B Oil & Gas | Bowie, TX 76230 | Oil & Gas Operator | Dec 2021 |
| 5662 | Circle C Oilfield Supply Inc | Wetumka, OK 74883-0068 | Oil & Gas Operator | Apr 2017 |
| 5663 | Circle C Operations | Winnsboro, TX 75494 | Oil Operator | Nov 2024 |
| 5664 | Circle D Oil & Gas, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Nov 2024 |
| 5665 | Circle E Oil - E | | Oil Operator | May 1990 |
| 5666 | Circle H Oil Company | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2020 |
| 5667 | Circle K Enterprises | | Oil & Gas Operator | Jun 2024 |
| 5668 | Circle K Oil & Gas Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Sep 2024 |
| 5669 | Circle Ridge Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 2024 |
| 5670 | Circle T Oil | | Oil Operator | Dec 2023 |
| 5671 | Circle W Oil & Gas Company | Pampa, TX 79066 | Oil & Gas Operator | Nov 2024 |
| 5672 | Circle-S Energy, LLC | McKinney, TX 75071 | Oil & Gas Operator | Nov 2024 |
| 5673 | Circleville Gas Co | Westerville, OH 43081 | Oil & Gas Operator | Dec 2004 |
| 5674 | Ciri Production Company | | Gas Operator | Mar 1994 |
| 5675 | Ciris Energy Inc | Centennial, CO 80112 | Gas Operator | Dec 2016 |
| 5676 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 5677 | Cirrus Exploration Company | Prosper, TX 75078 | Oil & Gas Operator | Nov 2024 |
| 5678 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Aug 2024 |
| 5679 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2024 |
| 5680 | Cisco Petroleum, Inc. | | Oil & Gas Operator | Oct 2010 |
| 5681 | Cisco Production Company, LLC | Victoria, TX 77902 | Oil & Gas Operator | May 2012 |
| 5682 | Citadel Exploration Inc. | | Oil Operator | Aug 2024 |
| 5683 | Citadel Oil LLC | Edmond, OK 73083 | Oil Operator | Jul 2024 |
| 5684 | Citadel Production Company, Inc. | Denver, CO 80201 | Oil Operator | Sep 1996 |
| 5685 | Citation Energy | | Oil & Gas Operator | Jul 1993 |
| 5686 | Citation Energy Company | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 5687 | Citation Oil & G | | Oil & Gas Operator | Dec 1996 |
| 5688 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Nov 2024 |
| 5689 | Cities Serv Oil & Gas Corp | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 1964 |
| 5690 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 5691 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 5692 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 5693 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 5694 | Citizen Energy II LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Jul 2024 |
| 5695 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 5696 | Citmoco Services, Inc. | | Oil Operator | Jan 1971 |
| 5697 | Citori Oil Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2004 |
| 5698 | Citori Oil Company, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2014 |
| 5699 | Citronelle Operating Co., LLC | | Oil & Gas Operator | Sep 1997 |
| 5700 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |