| 4401 | C.T.R. Oil, Inc. | | Oil & Gas Operator | Jan 2025 |
| 4402 | C.W. Pickering, Inc. | Victoria, TX 77904 | Gas Operator | Sep 2022 |
| 4403 | C.W.F.K., Inc. | | Gas Operator | Dec 1986 |
| 4404 | C12 Energy: North Dakota LLC | | Oil Operator | Apr 2017 |
| 4405 | C12 Kansas Oil, LLC | Denver, CO 80202 | Oil Operator | Dec 2009 |
| 4406 | C3oil, LLC | New Strawn, KS 66839 | Oil Operator | May 2026 |
| 4407 | C5 Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2019 |
| 4408 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Sep 2026 |
| 4409 | Caac 100 LLC | | Oil & Gas Operator | Mar 2026 |
| 4410 | Cab Resources, LLC | Odessa, TX 79762 | Oil Operator | Sep 2026 |
| 4411 | Caba, LLC | | Oil Operator | Jan 2025 |
| 4412 | Cabal Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 4413 | Caballero Operations LLC | | Oil & Gas Operator | Jun 2026 |
| 4414 | Cabana Oil Corp. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2006 |
| 4415 | Cabeza Oil And Gas, LLC | Austin, CO 81410 | Oil & Gas Operator | Mar 2022 |
| 4416 | Cable W S | Cleveland, OK 74020 | Oil Operator | Jan 2021 |
| 4417 | Cabot Exploration Corp | Houston, TX 77070 | Oil Operator | Jun 1999 |
| 4418 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jul 2026 |
| 4419 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 4420 | Cabot Petroleum | | Oil & Gas Operator | Oct 1996 |
| 4421 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 4422 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jun 2026 |
| 4423 | Cactus Gas & Oil, Inc. | San Antonio, TX 78259 | Oil & Gas Operator | Sep 2026 |
| 4424 | Cactus Jack Operating Company | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2003 |
| 4425 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 4426 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 4427 | Cactus Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2000 |
| 4428 | Cactus Operating Company, LLC | Lovington, NM 88260 | Oil & Gas Operator | Jul 2005 |
| 4429 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Sep 2026 |
| 4430 | Cad Energy Corporation | | Oil & Gas Operator | Dec 2021 |
| 4431 | Cada Operating, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2004 |
| 4432 | Caddeaux Gathering, LLC | | Oil Operator | Dec 2024 |
| 4433 | Caddell Well Service, Inc. | Prairie Lea, TX 78661 | Oil & Gas Operator | Sep 2026 |
| 4434 | Caddo Corporation | Austin, TX 78731 | Oil & Gas Operator | Sep 2026 |
| 4435 | Caddo Creek Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 1994 |
| 4436 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | Jul 2026 |
| 4437 | Caddo Gas Processing L.L.C. | | Oil Operator | Aug 2012 |
| 4438 | Caddo Management, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 4439 | Caddo Oil & Gas Inc | Oklahoma City, OK 73157 | Oil & Gas Operator | Jan 1997 |
| 4440 | Caddo Oil & Gas Co., Inc. | | Oil Operator | Jul 1990 |
| 4441 | Caddo Oil Co.,Inc. | | Oil & Gas Operator | Apr 1987 |
| 4442 | Caddo Operating Inc. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2026 |
| 4443 | Caddo Parish Holdings LLC | | Oil & Gas Operator | Jul 2020 |
| 4444 | Caddo Petroleum Dev., Inc. | | Oil Operator | Aug 1986 |
| 4445 | Caddo Pine Island Corp. | | Oil & Gas Operator | Sep 1997 |
| 4446 | Caddo Pine Island Operating Co | | Oil & Gas Operator | Aug 1998 |
| 4447 | Caddo Resources Inc | | Oil & Gas Operator | Dec 1986 |
| 4448 | Caddo Western Development, Inc | | Oil & Gas Operator | Aug 1984 |
| 4449 | Caddo-Marchand LC | Dallas, TX 75251-2202 | Oil & Gas Operator | Oct 2016 |
| 4450 | Cadence Energy Partners, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Jun 2010 |
| 4451 | Cadillac Operating Company, LLC | | Oil Operator | Jan 2025 |
| 4452 | Cady Myrle L | Sugar Grove, PA 16350-9803 | Oil & Gas Operator | Dec 2025 |
| 4453 | Caelus Natural Resources Alaska, LLC | | Oil & Gas Operator | Jul 2019 |
| 4454 | Caerus Kansas LLC | Denver, CO 80202 | Oil & Gas Operator | May 2026 |
| 4455 | Caerus Northern Rockies LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2021 |
| 4456 | Caerus Piceance LLC | | Oil & Gas Operator | Sep 2025 |
| 4457 | Caerus Southern Rockies LLC | Denver, CO 80202 | Gas Operator | Nov 2017 |
| 4458 | Caerus Washco LLC | Denver, CO 80202 | Gas Operator | Mar 2015 |
| 4459 | Caflisch, James E. | Clymer, NY 14724 | Gas Operator | Dec 2025 |
| 4460 | Cag Petroleum Corp. | Dallas, TX 75382 | Oil & Gas Operator | Sep 2026 |
| 4461 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Sep 2026 |
| 4462 | Cahoj, H. Drilling | McDonald, KS 67745 | Oil Operator | Jan 2000 |
| 4463 | Cain Glen | | Oil Operator | Dec 2016 |
| 4464 | Cain Randy A | Duncan, OK 73533 | Oil & Gas Operator | Jul 2026 |
| 4465 | Cain Richard | Comanche, OK 73529-1248 | Oil & Gas Operator | May 2020 |
| 4466 | Cain, Chas | Lexington, KY 40509 | Oil & Gas Operator | Dec 2024 |
| 4467 | Cain, Francis E. | Big Bend, WV 261360080 | Oil & Gas Operator | Dec 2021 |
| 4468 | Cain, Jim | Great Bend, KS 67530 | Oil Operator | Feb 2009 |
| 4469 | Cain, L. L. & White, Wayne R. | Lubbock, TX 79407 | Oil & Gas Operator | Apr 2005 |
| 4470 | Cain, Milton | | Oil & Gas Operator | Dec 2021 |
| 4471 | Cain, Nicholas A & Darry R | | Oil Operator | Dec 2003 |
| 4472 | Caird Operating, LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Sep 2026 |
| 4473 | Cairn Energy Partners, LLC | | Oil & Gas Operator | Feb 2023 |
| 4474 | Cajeza Energy | Drumright, OK 74030 | Oil & Gas Operator | May 2013 |
| 4475 | Cajun Minerals, Inc. | | Oil & Gas Operator | Mar 1997 |
| 4476 | Cajun Operating, Inc. | | Oil & Gas Operator | Jun 2011 |
| 4477 | Cal Ban Corp. | Olean, NY 14760 | Oil & Gas Operator | Dec 2025 |
| 4478 | Cal Continental Capital Inc. | | Oil Operator | Dec 2006 |
| 4479 | Cal Oil | | Oil Operator | Jul 1986 |
| 4480 | Cal Oil Company | Missouri City, TX 77459 | Oil Operator | May 2022 |
| 4481 | Cal-Mon Oil Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 4482 | Cal-T Oil Company, Incorporated | Borger, TX 79008 | Oil & Gas Operator | Feb 2008 |
| 4483 | Cal-Tex Exploration & Production Company LLC | San Antonio, TX 78228 | Oil & Gas Operator | Sep 2026 |
| 4484 | Cal-Tex Fossil, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 4485 | Cal-Tex Gas Transmission Co,Inc. | Mabank, TX 75147 | Oil & Gas Operator | Nov 1999 |
| 4486 | Cal-Tex Operating Co. | Manchaca, TX 78652 | Oil & Gas Operator | May 2020 |
| 4487 | Cala Oil & Gas | | Oil & Gas Operator | Oct 1997 |
| 4488 | Calais Oil & Gas, L.L.C. | | Oil Operator | Dec 2024 |
| 4489 | Calame, Richard | Devine, TX 78016 | Oil Operator | Sep 2026 |
| 4490 | Calarie Lee J & Lisa A | Rural Valley, PA 16249-4113 | Oil & Gas Operator | Dec 2025 |
| 4491 | Calco Inc | | Oil & Gas Operator | Feb 1991 |
| 4492 | Caldera Operating Company LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 4493 | Caldera Resources LLC | Smicksburg, PA 16256-0055 | Gas Operator | Dec 2025 |
| 4494 | Caldwell & Self | | Oil Operator | Dec 2024 |
| 4495 | Caldwell & Trahan | | Oil Operator | Dec 2024 |
| 4496 | Caldwell Engineering & Construction Inc | Chandler, OK 74834-5420 | Oil & Gas Operator | Jan 2025 |
| 4497 | Caldwell Entr In | | Oil Operator | Dec 1993 |
| 4498 | Caldwell Oil Company | | Oil Operator | Jul 2012 |
| 4499 | Caldwell Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 4500 | Caldwell Production | | Oil Operator | Dec 2024 |