| 4501 | Cal Oil | | Oil Operator | Jul 1986 |
| 4502 | Cal Oil Company | Missouri City, TX 77459 | Oil Operator | May 2022 |
| 4503 | Cal-Mon Oil Company | Midland, TX 79701 | Oil & Gas Operator | Aug 2026 |
| 4504 | Cal-T Oil Company, Incorporated | Borger, TX 79008 | Oil & Gas Operator | Feb 2008 |
| 4505 | Cal-Tex Exploration & Production Company LLC | San Antonio, TX 78228 | Oil & Gas Operator | Aug 2026 |
| 4506 | Cal-Tex Fossil, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 4507 | Cal-Tex Gas Transmission Co,Inc. | Mabank, TX 75147 | Oil & Gas Operator | Nov 1999 |
| 4508 | Cal-Tex Operating Co. | Manchaca, TX 78652 | Oil & Gas Operator | May 2020 |
| 4509 | Cala Oil & Gas | | Oil & Gas Operator | Oct 1997 |
| 4510 | Calais Oil & Gas, L.L.C. | | Oil Operator | Dec 2024 |
| 4511 | Calame, Richard | Devine, TX 78016 | Oil Operator | Aug 2026 |
| 4512 | Calarie Lee J & Lisa A | Rural Valley, PA 16249-4113 | Oil & Gas Operator | Dec 2025 |
| 4513 | Calco Inc | | Oil & Gas Operator | Feb 1991 |
| 4514 | Caldera Operating Company LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 4515 | Caldera Resources LLC | Smicksburg, PA 16256-0055 | Gas Operator | Dec 2025 |
| 4516 | Caldwell & Self | | Oil Operator | Dec 2024 |
| 4517 | Caldwell & Trahan | | Oil Operator | Dec 2024 |
| 4518 | Caldwell Engineering & Construction Inc | Chandler, OK 74834-5420 | Oil & Gas Operator | Jan 2025 |
| 4519 | Caldwell Entr In | | Oil Operator | Dec 1993 |
| 4520 | Caldwell Oil Company | | Oil Operator | Jul 2012 |
| 4521 | Caldwell Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 4522 | Caldwell Production | | Oil Operator | Dec 2024 |
| 4523 | Caldwell Production Co. Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2010 |
| 4524 | Caldwell, J. A. | San Antonio, TX 78223 | Oil & Gas Operator | Jun 2000 |
| 4525 | Caldwell-Bayou State | | Oil Operator | Dec 2024 |
| 4526 | Calebs Resources LLC | Edmond, OK 73012 | Oil & Gas Operator | Apr 2026 |
| 4527 | Caleco LLC | | Oil & Gas Operator | May 2026 |
| 4528 | Caledonia Energy Partners, LLC | | Oil & Gas Operator | Mar 2007 |
| 4529 | Calera Gas LLC | Montevallo, AL 35115 | Gas Operator | May 2026 |
| 4530 | Calfas Cattle & Oil, LLC | San Antonio, TX 78205 | Oil Operator | Aug 2026 |
| 4531 | Calfas Oil, LLC | San Antonio, TX 78205 | Oil Operator | Aug 2026 |
| 4532 | Calgary Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2026 |
| 4533 | Calhoun & Ellison Oil Co. | San Antonio, TX 78248 | Oil & Gas Operator | Dec 1997 |
| 4534 | Calhoun, Clay | | Gas Operator | Sep 1989 |
| 4535 | Cali Crude LLC | Austin, TX 78738 | Oil Operator | Aug 2026 |
| 4536 | Calico Operating Co., Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2002 |
| 4537 | Caliente Oil LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Aug 2026 |
| 4538 | California E.D.I. Inc. | | Oil & Gas Operator | Jan 2018 |
| 4539 | California Hydrocarbons Corporation | | Gas Operator | Apr 2026 |
| 4540 | California Oil Co | | Oil & Gas Operator | Aug 1965 |
| 4541 | California Oil Independents | | Oil & Gas Operator | Dec 2025 |
| 4542 | California Petroleum Group Inc. | | Oil Operator | Mar 2026 |
| 4543 | California Resources Elk Hills LLC | | Oil & Gas Operator | Jun 2026 |
| 4544 | California Resources Long Beach Inc. | | Oil & Gas Operator | Jun 2026 |
| 4545 | California Resources Production Corporation | | Oil & Gas Operator | Jun 2026 |
| 4546 | California Southern Oil Co. | | Oil Operator | Dec 2000 |
| 4547 | California Time Petroleum, Inc | | Oil Operator | Mar 1986 |
| 4548 | California/Nevada Developments LLC | | Oil Operator | Dec 2001 |
| 4549 | Calima Energy LLC | Electra, TX 76360 | Oil Operator | Oct 2025 |
| 4550 | Calistoga Energy Reserves, LLC | Houston, TX 77063 | Oil & Gas Operator | Aug 2026 |
| 4551 | Calk Oil Company | Lytle, TX 78052 | Oil Operator | Aug 2026 |
| 4552 | Calk Operating, LLC | Lytle, TX 78052 | Oil Operator | Aug 2026 |
| 4553 | Calk, Roger D. | Lytle, TX 78052 | Oil & Gas Operator | Aug 2026 |
| 4554 | Call Farms, Inc. | Batavia, NY 14020 | Gas Operator | Dec 2025 |
| 4555 | Call Harold Charles | Dewey, OK 74029 | Oil Operator | Apr 2026 |
| 4556 | Call, Harold L | | Oil Operator | Mar 2015 |
| 4557 | Callahan Land Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2020 |
| 4558 | Callahan, Stephen Et Al | Navarre, FL 32566 | Oil & Gas Operator | Dec 2022 |
| 4559 | Callander & Kimbrel Inc | Cerluean, KY 42215 | Oil & Gas Operator | Dec 1989 |
| 4560 | Callarman, David | Cisco, TX 76437 | Oil & Gas Operator | Aug 2026 |
| 4561 | Callaway Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | May 2026 |
| 4562 | Callaway Production Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 4563 | Calley, Bob | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 4564 | Callie Oil Company LLC | Perry, OK 73077 | Oil & Gas Operator | May 2026 |
| 4565 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 4566 | Callon (Permian) LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 4567 | Callon Offshore Production, Inc. | Natchez, MS 39121 | Oil & Gas Operator | Dec 2005 |
| 4568 | Callon Oil Co, Cambell | | Oil & Gas Operator | Oct 1984 |
| 4569 | Callon Permian II, LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2024 |
| 4570 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 4571 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 4572 | Calnrg Operating LLC | | Oil & Gas Operator | Jun 2026 |
| 4573 | Calpetco-Herbst Expl. Inc. | | Gas Operator | Jan 1990 |
| 4574 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 4575 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 4576 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 4577 | Calresources LLC | | Oil & Gas Operator | Dec 1996 |
| 4578 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Aug 2026 |
| 4579 | Caltico Oil Corp. | | Oil Operator | Dec 2025 |
| 4580 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 4581 | Calumet Lubricants Company | | Oil Operator | Dec 1993 |
| 4582 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 4583 | Calumet Refining Co. | | Oil Operator | May 1991 |
| 4584 | Calvert Drilling Co. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1992 |
| 4585 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 4586 | Calvert Operating LLC | Oklahoma City, OK 73118 | Oil Operator | Apr 2026 |
| 4587 | Calvin Explorati | | Oil & Gas Operator | Oct 1991 |
| 4588 | Calvin F Tennison | Granbury, TX 76049 | Oil & Gas Operator | Apr 2007 |
| 4589 | Calvin Noah, LLC | Valley Center, KS 67147 | Oil Operator | Apr 2026 |
| 4590 | Calyx Energy III LLC | Tulsa, OK 74136-4226 | Oil & Gas Operator | Apr 2026 |
| 4591 | Calyx Energy LLC | Tulsa, OK 74146-3807 | Oil & Gas Operator | Feb 2020 |
| 4592 | Calyx Exploration & Production | | Oil & Gas Operator | Jul 1991 |
| 4593 | Cam Company | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2004 |
| 4594 | Cam Consultants Inc | Akron, OH 44309 | Oil & Gas Operator | Dec 2023 |
| 4595 | Cam Development | | Oil & Gas Operator | Dec 1990 |
| 4596 | Camar Exploration | | Oil Operator | Jan 1989 |
| 4597 | Cambern, Rex | Montgomery, TX 77356 | Oil Operator | Jan 1996 |
| 4598 | Cambria Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2019 |
| 4599 | Cambria Oil Company | Casper, WY 82601 | Oil & Gas Operator | Dec 1996 |
| 4600 | Cambrian Hunter Inc | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2025 |