| 4401 | C&D Supply | Cherokee, OK 73728-5817 | Oil & Gas Operator | Aug 2024 |
| 4402 | C&M Operating Company, LLC | | Oil & Gas Operator | Apr 2011 |
| 4403 | C&P Resources Operating Co,LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2024 |
| 4404 | C-D Oil Company, Inc. | Austin, TX 78731 | Oil Operator | Nov 2024 |
| 4405 | C-V Oil Company | Memphis, TN 38103 | Oil Operator | Jun 1998 |
| 4406 | C-Water Disposal Inc | Oklahoma City, OK 73116-7326 | Oil Operator | Dec 2014 |
| 4407 | C. A. Cardneaux, Inc. | | Oil & Gas Operator | Apr 1990 |
| 4408 | C. C. Killingsworth Opr. | | Oil Operator | Dec 1999 |
| 4409 | C. Case Company | | Oil & Gas Operator | Sep 2024 |
| 4410 | C. D. Oil, Inc. | Wellsville, KS 66092 | Oil Operator | Dec 2009 |
| 4411 | C. D. Pierce | | Oil Operator | Mar 1991 |
| 4412 | C. E. Allen Co. Inc. | | Oil & Gas Operator | Sep 2024 |
| 4413 | C. E. Braly | | Oil & Gas Operator | Dec 1991 |
| 4414 | C. F. Oil, A General Partnership | Lake Lotawana, MO 64086 | Oil Operator | Apr 2024 |
| 4415 | C. F. Sudduth | | Oil & Gas Operator | Dec 1988 |
| 4416 | C. H. C. Gerard | | Oil & Gas Operator | Jul 2024 |
| 4417 | C. H. Levens, Inc. | Water Valley, TX 76958 | Oil Operator | Jul 2024 |
| 4418 | C. H. Todd, Inc. | Wichita, KS 67212 | Oil & Gas Operator | Dec 2019 |
| 4419 | C. I. McKown & Son, Inc. | Newton, WV 25266-0711 | Oil & Gas Operator | Dec 2021 |
| 4420 | C. J. Broome Oil Company | | Oil & Gas Operator | Jan 2020 |
| 4421 | C. J. Services | | Oil & Gas Operator | Sep 2016 |
| 4422 | C. L. Brown, III | | Oil Operator | Dec 1991 |
| 4423 | C. L. Brown, Inc. | | Oil Operator | Dec 1999 |
| 4424 | C. L. Morris | | Oil Operator | Feb 2004 |
| 4425 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 4426 | C. M. Frizzell | | Oil & Gas Operator | Mar 2014 |
| 4427 | C. M. Oil Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2016 |
| 4428 | C. M. Roberson | | Oil Operator | Jun 1984 |
| 4429 | C. O. Oil And Gas, LLC | Pampa, TX 79066 | Oil & Gas Operator | Nov 2024 |
| 4430 | C. Smith & Associates, Inc. | | Oil Operator | Aug 1991 |
| 4431 | C. T. & Ted Paul | | Oil Operator | Mar 2019 |
| 4432 | C. V. Radke | | Oil Operator | Jan 1993 |
| 4433 | C. W. Brumley | | Oil & Gas Operator | Jun 2006 |
| 4434 | C. W. Resources, Inc. | Longview, TX 75604 | Oil & Gas Operator | Nov 2024 |
| 4435 | C. Wayland Brooks | | Oil & Gas Operator | Dec 1987 |
| 4436 | C.B.C. Producing Co. | | Oil & Gas Operator | Jul 1989 |
| 4437 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 4438 | C.F. Braun & Company | | Oil & Gas Operator | Dec 1986 |
| 4439 | C.F.D. Inc. | | Oil & Gas Operator | Nov 1988 |
| 4440 | C.F.O., Inc. | Liberty, TX 77575 | Oil Operator | Nov 2024 |
| 4441 | C.J. Oil Company | Iowa Park, TX 76367 | Oil Operator | Jul 2024 |
| 4442 | C.O.W. Operating Company | Graham, TX 76450 | Oil Operator | Nov 2024 |
| 4443 | C.P.I. | | Oil & Gas Operator | Oct 2007 |
| 4444 | C.S.V. Oil Exploration Co | West Jordan, UT 84088 | Gas Operator | Sep 2024 |
| 4445 | C.T.R. Oil, Inc. | | Oil & Gas Operator | Jun 2024 |
| 4446 | C.W. Pickering, Inc. | Victoria, TX 77904 | Gas Operator | Sep 2022 |
| 4447 | C.W.F.K., Inc. | | Gas Operator | Dec 1986 |
| 4448 | C12 Energy: North Dakota LLC | | Oil Operator | Apr 2017 |
| 4449 | C12 Kansas Oil, LLC | Denver, CO 80202 | Oil Operator | Dec 2009 |
| 4450 | C12: Arkansas Oil, LLC | Lowerville, AR 71545 | Oil & Gas Operator | Jul 2024 |
| 4451 | C3oil, LLC | New Strawn, KS 66839 | Oil Operator | Jul 2024 |
| 4452 | C5 Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2019 |
| 4453 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Nov 2024 |
| 4454 | Caac 100 LLC | | Oil & Gas Operator | Aug 2024 |
| 4455 | Cab Resources, LLC | Odessa, TX 79762 | Oil Operator | Nov 2024 |
| 4456 | Caba, LLC | | Oil Operator | Jul 2024 |
| 4457 | Cabal Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 4458 | Caballero Operations LLC | | Oil & Gas Operator | Sep 2024 |
| 4459 | Cabana Oil Corp. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2006 |
| 4460 | Cabeza Oil And Gas, LLC | Austin, CO 81410 | Oil & Gas Operator | Mar 2022 |
| 4461 | Cable W S | Cleveland, OK 74020 | Oil Operator | Jan 2021 |
| 4462 | Cabot Exploration Corp | Houston, TX 77070 | Oil Operator | Jun 1999 |
| 4463 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Aug 2024 |
| 4464 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 4465 | Cabot Petroleum | | Oil & Gas Operator | Oct 1996 |
| 4466 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 4467 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Aug 2024 |
| 4468 | Cactus Gas & Oil, Inc. | San Antonio, TX 78259 | Oil & Gas Operator | Nov 2024 |
| 4469 | Cactus Jack Operating Company | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2003 |
| 4470 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 4471 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 4472 | Cactus Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2000 |
| 4473 | Cactus Operating Company, LLC | Lovington, NM 88260 | Oil & Gas Operator | Jul 2005 |
| 4474 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Nov 2024 |
| 4475 | Cad Energy Corporation | Creston, WV 26141 | Oil & Gas Operator | Dec 2021 |
| 4476 | Cada Operating, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2004 |
| 4477 | Caddeaux Gathering, LLC | | Oil Operator | Jul 2024 |
| 4478 | Caddell Well Service, Inc. | Prairie Lea, TX 78661 | Oil & Gas Operator | Nov 2024 |
| 4479 | Caddo Corporation | Austin, TX 78731 | Oil & Gas Operator | Nov 2024 |
| 4480 | Caddo Creek Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 1994 |
| 4481 | Caddo Exploration, LLC | Norman, OK 73072 | Gas Operator | Sep 2024 |
| 4482 | Caddo Gas Processing L.L.C. | | Oil Operator | Aug 2012 |
| 4483 | Caddo Management, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2024 |
| 4484 | Caddo Oil & Gas Inc | Oklahoma City, OK 73157 | Oil & Gas Operator | Jan 1997 |
| 4485 | Caddo Oil & Gas Co., Inc. | | Oil Operator | Jul 1990 |
| 4486 | Caddo Oil Co.,Inc. | | Oil & Gas Operator | Apr 1987 |
| 4487 | Caddo Operating Inc. | Marshall, TX 75671 | Oil & Gas Operator | Nov 2024 |
| 4488 | Caddo Parish Holdings LLC | | Oil & Gas Operator | Jul 2020 |
| 4489 | Caddo Petroleum Dev., Inc. | | Oil Operator | Aug 1986 |
| 4490 | Caddo Pine Island Corp. | | Oil & Gas Operator | Sep 1997 |
| 4491 | Caddo Pine Island Operating Co | | Oil & Gas Operator | Aug 1998 |
| 4492 | Caddo Resources Inc | | Oil & Gas Operator | Dec 1986 |
| 4493 | Caddo Western Development, Inc | | Oil & Gas Operator | Aug 1984 |
| 4494 | Caddo-Marchand LC | Dallas, TX 75251-2202 | Oil & Gas Operator | Oct 2016 |
| 4495 | Cadence Energy Partners, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Jun 2010 |
| 4496 | Cadillac Operating Company, LLC | | Oil Operator | Jul 2024 |
| 4497 | Cady Myrle L | Sugar Grove, PA 16350-9803 | Oil & Gas Operator | Dec 2023 |
| 4498 | Caelus Natural Resources Alaska, LLC | | Oil & Gas Operator | Jul 2019 |
| 4499 | Caerus Kansas LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2024 |
| 4500 | Caerus Northern Rockies LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2021 |