| 4601 | Caldwell & Trahan | | Oil Operator | Dec 2024 |
| 4602 | Caldwell Engineering & Construction Inc | Chandler, OK 74834-5420 | Oil & Gas Operator | Jan 2025 |
| 4603 | Caldwell Entr In | | Oil Operator | Dec 1993 |
| 4604 | Caldwell Oil Company | | Oil Operator | Jul 2012 |
| 4605 | Caldwell Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 4606 | Caldwell Production | | Oil Operator | Dec 2024 |
| 4607 | Caldwell Production Co. Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2010 |
| 4608 | Caldwell, J. A. | San Antonio, TX 78223 | Oil & Gas Operator | Jun 2000 |
| 4609 | Caldwell-Bayou State | | Oil Operator | Dec 2024 |
| 4610 | Calebs Resources LLC | Edmond, OK 73012 | Oil & Gas Operator | Apr 2025 |
| 4611 | Caleco LLC | | Oil & Gas Operator | Apr 2025 |
| 4612 | Caledonia Energy Partners, LLC | | Oil & Gas Operator | Mar 2007 |
| 4613 | Calera Gas LLC | Montevallo, AL 35115 | Gas Operator | Mar 2025 |
| 4614 | Calfas Cattle & Oil, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2025 |
| 4615 | Calfas Oil, LLC | San Antonio, TX 78205 | Oil Operator | Jul 2025 |
| 4616 | Calgary Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2025 |
| 4617 | Calhoun & Ellison Oil Co. | San Antonio, TX 78248 | Oil & Gas Operator | Dec 1997 |
| 4618 | Calhoun, Clay | | Gas Operator | Sep 1989 |
| 4619 | Cali Crude LLC | Austin, TX 78738 | Oil Operator | Jul 2025 |
| 4620 | Calico Operating Co., Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2002 |
| 4621 | Caliente Oil LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Jul 2025 |
| 4622 | California E.D.I. Inc. | | Oil & Gas Operator | Jan 2018 |
| 4623 | California Hydrocarbons Corporation | | Gas Operator | Apr 2025 |
| 4624 | California Oil Co | | Oil & Gas Operator | Aug 1965 |
| 4625 | California Oil Independents | | Oil & Gas Operator | Apr 2025 |
| 4626 | California Petroleum Group Inc. | | Oil Operator | Apr 2025 |
| 4627 | California Resources Elk Hills LLC | | Oil & Gas Operator | May 2025 |
| 4628 | California Resources Long Beach Inc. | | Oil & Gas Operator | May 2025 |
| 4629 | California Resources Production Corporation | | Oil & Gas Operator | Apr 2025 |
| 4630 | California Southern Oil Co. | | Oil Operator | Dec 2000 |
| 4631 | California Time Petroleum, Inc | | Oil Operator | Mar 1986 |
| 4632 | California/Nevada Developments LLC | | Oil Operator | Dec 2001 |
| 4633 | Calima Energy LLC | Electra, TX 76360 | Oil Operator | Jul 2025 |
| 4634 | Calistoga Energy Reserves, LLC | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 4635 | Calk Oil Company | Lytle, TX 78052 | Oil Operator | Jul 2025 |
| 4636 | Calk Operating, LLC | Lytle, TX 78052 | Oil Operator | Jul 2025 |
| 4637 | Calk, Roger D. | Lytle, TX 78052 | Oil & Gas Operator | Jul 2025 |
| 4638 | Call Farms, Inc. | Batavia, NY 14020 | Gas Operator | Dec 2024 |
| 4639 | Call Harold Charles | Dewey, OK 74029 | Oil Operator | Apr 2025 |
| 4640 | Call, Harold L | | Oil Operator | Mar 2015 |
| 4641 | Callahan Land Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2020 |
| 4642 | Callahan, Stephen Et Al | Navarre, FL 32566 | Oil & Gas Operator | Dec 2022 |
| 4643 | Callander & Kimbrel Inc | Cerluean, KY 42215 | Oil & Gas Operator | Dec 1989 |
| 4644 | Callarman, David | Cisco, TX 76437 | Oil & Gas Operator | Jul 2025 |
| 4645 | Callaway Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Apr 2025 |
| 4646 | Callaway Production Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 4647 | Calley, Bob | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 4648 | Callie Oil Company LLC | Perry, OK 73077 | Oil & Gas Operator | May 2025 |
| 4649 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 4650 | Callon (Permian) LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 4651 | Callon Offshore Production, Inc. | Natchez, MS 39121 | Oil & Gas Operator | Dec 2005 |
| 4652 | Callon Oil Co, Cambell | | Oil & Gas Operator | Oct 1984 |
| 4653 | Callon Permian II, LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2024 |
| 4654 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 4655 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 4656 | Calnrg Operating LLC | | Oil & Gas Operator | Apr 2025 |
| 4657 | Calpetco-Herbst Expl. Inc. | | Gas Operator | Jan 1990 |
| 4658 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 4659 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 4660 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 4661 | Calresources LLC | | Oil & Gas Operator | Dec 1996 |
| 4662 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Jul 2025 |
| 4663 | Caltico Oil Corp. | | Oil Operator | Apr 2025 |
| 4664 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 4665 | Calumet Lubricants Company | | Oil Operator | Dec 1993 |
| 4666 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 4667 | Calumet Refining Co. | | Oil Operator | May 1991 |
| 4668 | Calvert Drilling Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1992 |
| 4669 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 4670 | Calvert Operating LLC | Oklahoma City, OK 73118 | Oil Operator | May 2025 |
| 4671 | Calvin Explorati | | Oil & Gas Operator | Oct 1991 |
| 4672 | Calvin F Tennison | Granbury, TX 76049 | Oil & Gas Operator | Apr 2007 |
| 4673 | Calvin Noah, LLC | Valley Center, KS 67147 | Oil Operator | Mar 2025 |
| 4674 | Calyx Energy III LLC | Tulsa, OK 74136-4226 | Oil & Gas Operator | Apr 2025 |
| 4675 | Calyx Energy LLC | Tulsa, OK 74146-3807 | Oil & Gas Operator | Feb 2020 |
| 4676 | Calyx Exploration & Production | | Oil & Gas Operator | Jul 1991 |
| 4677 | Cam Company | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2004 |
| 4678 | Cam Consultants Inc | Akron, OH 44309 | Oil & Gas Operator | Dec 2023 |
| 4679 | Cam Development | | Oil & Gas Operator | Dec 1990 |
| 4680 | Camar Exploration | | Oil Operator | Jan 1989 |
| 4681 | Cambern, Rex | Montgomery, TX 77356 | Oil Operator | Jan 1996 |
| 4682 | Cambria Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2019 |
| 4683 | Cambria Oil Company | Casper, WY 82601 | Oil & Gas Operator | Dec 1996 |
| 4684 | Cambrian Hunter Inc | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2024 |
| 4685 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Jul 2025 |
| 4686 | Cambrian Oil Inc | Odessa, TX 79760 | Oil & Gas Operator | Aug 1996 |
| 4687 | Cambridge Energy Corporation | | Oil & Gas Operator | Jul 2003 |
| 4688 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 4689 | Cambron, Paul L. | Ness City, KS 67560 | Oil & Gas Operator | Dec 2019 |
| 4690 | Camco Resources, Inc. | | Oil Operator | Aug 1991 |
| 4691 | Camco Saltwater Transport | George West, TX 78022 | Oil Operator | Feb 2015 |
| 4692 | Camco Saltwater Transport,L.L.C. | George West, TX 78022 | Oil Operator | Jul 2025 |
| 4693 | Camco, Inc | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 4694 | Camden Oil & Gas, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Dec 2005 |
| 4695 | Camden Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Mar 2011 |
| 4696 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 4697 | Camden Resources, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2015 |
| 4698 | Camelot Oil And Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 4699 | Cameron & Kincaid | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1986 |
| 4700 | Cameron Brothers | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1995 |