| 4401 | C & R Drilling C | | Oil Operator | Aug 1994 |
| 4402 | C & R Oil | | Oil Operator | Jun 2025 |
| 4403 | C & R Oil Co. | Abilene, TX 79605 | Oil & Gas Operator | Oct 2025 |
| 4404 | C & R Petroleum Co. | Duncan, OK 73533-1341 | Oil & Gas Operator | Jun 2025 |
| 4405 | C & R Well Servi | | Oil Operator | Sep 1996 |
| 4406 | C & R Well Service, A General Partnership | Garnett, KS 66032 | Oil Operator | Dec 2009 |
| 4407 | C & S Energy Corp | Liverpool, NY 13088 | Oil & Gas Operator | Dec 1986 |
| 4408 | C & S Oil | | Oil Operator | Dec 2019 |
| 4409 | C & S Oil Compan | | Oil & Gas Operator | Jun 1992 |
| 4410 | C & S Oil Company | Odessa, TX 79763 | Oil & Gas Operator | Nov 2019 |
| 4411 | C & S Oil Company, LLC | Russell, KS 67665 | Oil Operator | Jun 2025 |
| 4412 | C & S Operating | Whiteface, TX 79379 | Oil & Gas Operator | Oct 2025 |
| 4413 | C & S Properties | | Oil & Gas Operator | Jun 1996 |
| 4414 | C & S Well Servi | | Oil & Gas Operator | Nov 1995 |
| 4415 | C & S Well Servicing Co. | Lyons, KS 67554 | Oil & Gas Operator | Jul 2000 |
| 4416 | C & T Energy Co | Bartlesville, OK 74006 | Oil & Gas Operator | Nov 2004 |
| 4417 | C & T Energy LLC | Morris, OK 74445-2667 | Oil & Gas Operator | Jun 2025 |
| 4418 | C & T Energy Of East Canton Inc | East Canton, OH 44730 | Oil & Gas Operator | Dec 2024 |
| 4419 | C & V Oil And Gas | Marietta, OH 45750 | Oil & Gas Operator | Dec 2011 |
| 4420 | C & VC, Inc. | | Oil & Gas Operator | Sep 1991 |
| 4421 | C & W Oil Inc | | Oil & Gas Operator | Aug 2016 |
| 4422 | C & W Operating LLC | Tulsa, OK 74145-7627 | Oil Operator | May 2020 |
| 4423 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Jul 2025 |
| 4424 | C A P Operating | | Oil Operator | Sep 1992 |
| 4425 | C And D Explorations LLC | | Oil Operator | Sep 2025 |
| 4426 | C And M Oil Inc | Kimball, NE 69145 | Oil & Gas Operator | Dec 2024 |
| 4427 | C And S Oil & Gas | San Antonio, TX 78217 | Oil & Gas Operator | Feb 1998 |
| 4428 | C B Energy Resources | Bartlesville, OK 74006 | Oil & Gas Operator | Mar 2015 |
| 4429 | C Bar K Enterprises Inc | Oklahoma City, OK 73154-1828 | Oil & Gas Operator | Dec 2022 |
| 4430 | C Bar Petroleum Company | Lubbock, TX 79413 | Oil & Gas Operator | May 2018 |
| 4431 | C C & S Oil Oper | | Oil Operator | Apr 1983 |
| 4432 | C C Co | Holladay, UT 84124 | Oil & Gas Operator | Jan 2020 |
| 4433 | C D Oil | Wellsville, KS 66092 | Oil Operator | Aug 1998 |
| 4434 | C E D LC | Enid, OK 73702-0326 | Oil & Gas Operator | Oct 2021 |
| 4435 | C E Energy LLC | Katy, TX 77449 | Oil Operator | Oct 2025 |
| 4436 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | Jul 2025 |
| 4437 | C E L Inc | Bartlesville, OK 74006 | Oil & Gas Operator | Jan 2020 |
| 4438 | C E Larue & B M Muncy Jr | Artesia, NM 882111370 | Oil & Gas Operator | Jun 2006 |
| 4439 | C E Staples | Dallas, TX 75205 | Oil & Gas Operator | Jul 1995 |
| 4440 | C F & L Producing Co | | Oil & Gas Operator | Sep 2000 |
| 4441 | C F M Oil Co Dba Louis And Judy Fulton | Artesia, NM 88210 | Oil & Gas Operator | May 2011 |
| 4442 | C F Oil - Frazie | | Oil Operator | Dec 1994 |
| 4443 | C G Davis, Et Al | | Oil & Gas Operator | Mar 1986 |
| 4444 | C G G Oil Co | | Oil & Gas Operator | Dec 2006 |
| 4445 | C G O Inc | Wheeling, WV 26003 | Oil & Gas Operator | Dec 2024 |
| 4446 | C G Oil, Inc. | Victoria, KS 67671 | Oil Operator | Jun 2025 |
| 4447 | C H E Company Inc | Shawnee, OK 74801 | Oil Operator | Feb 2012 |
| 4448 | C H K Oil, LLC | Stephens, AR 71764 | Oil Operator | Jan 2025 |
| 4449 | C K Oil Company | Great Bend, KS 67530 | Oil & Gas Operator | Jun 2025 |
| 4450 | C L & S Oil Company Inc | Perry, OK 73077-0841 | Oil & Gas Operator | Jan 2018 |
| 4451 | C L Conner | Humble, TX 77338 | Oil & Gas Operator | Mar 2025 |
| 4452 | C M F Oil LLC | | Oil Operator | Dec 2024 |
| 4453 | C M S Gas Transmission Co | | Oil & Gas Operator | Dec 2020 |
| 4454 | C M S Oil And Gas Co And Miller Brothers | | Oil & Gas Operator | Apr 1992 |
| 4455 | C M T Petroleum | | Oil Operator | Jul 1995 |
| 4456 | C M X Incorporat | | Oil & Gas Operator | Dec 1996 |
| 4457 | C N B Enterprises | Yates Center, KS 66783 | Oil & Gas Operator | Jan 2009 |
| 4458 | C O Fulton | Artesia, NM 88211 | Oil & Gas Operator | Sep 2022 |
| 4459 | C O G Company | Bangs, TX 76823 | Oil & Gas Operator | Oct 2025 |
| 4460 | C Oil Co. | New Braunfels, TX 78132 | Oil & Gas Operator | Feb 2017 |
| 4461 | C R A C O Incorp | | Oil Operator | May 1988 |
| 4462 | C R I Inc | Midland, TX 79702 | Oil & Gas Operator | Nov 1993 |
| 4463 | C Rose Oil Co. | Midland, TX 79708 | Oil & Gas Operator | Jun 2025 |
| 4464 | C S J, Inc. | Austin, TX 78716 | Oil & Gas Operator | Oct 2025 |
| 4465 | C S Petroleum Inc | Norman, OK 73070 | Oil & Gas Operator | Dec 2024 |
| 4466 | C T R Resources Inc | Alliance, OH 44601 | Oil & Gas Operator | Dec 2013 |
| 4467 | C W Oil Producer | | Oil Operator | Oct 1998 |
| 4468 | C W Riggs Inc | St. Marys, WV 26170 | Oil & Gas Operator | Dec 1999 |
| 4469 | C W Trainer | Midland, TX 79702 | Oil & Gas Operator | Nov 2009 |
| 4470 | C&C II | Pleasanton, TX 78064 | Oil & Gas Operator | Mar 1998 |
| 4471 | C&D Management Company Dba Freedom Ventures | Las Vegas, NV 89149 | Oil & Gas Operator | Feb 2019 |
| 4472 | C&D Supply | Cherokee, OK 73728-5817 | Oil & Gas Operator | Jun 2025 |
| 4473 | C&M Operating Company, LLC | | Oil & Gas Operator | Apr 2011 |
| 4474 | C&P Resources Operating Co,LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 4475 | C-D Oil Company, Inc. | Cameron, TX 76520 | Oil Operator | Oct 2025 |
| 4476 | C-V Oil Company | Memphis, TN 38103 | Oil Operator | Jun 1998 |
| 4477 | C-Water Disposal Inc | Oklahoma City, OK 73116-7326 | Oil Operator | Dec 2014 |
| 4478 | C. A. Cardneaux, Inc. | | Oil & Gas Operator | Apr 1990 |
| 4479 | C. C. Killingsworth Opr. | | Oil Operator | Dec 1999 |
| 4480 | C. Case Company | | Oil & Gas Operator | Jul 2025 |
| 4481 | C. D. Oil, Inc. | Wellsville, KS 66092 | Oil Operator | Dec 2009 |
| 4482 | C. D. Pierce | | Oil Operator | Mar 1991 |
| 4483 | C. E. Allen Co. Inc. | | Oil & Gas Operator | Jul 2025 |
| 4484 | C. E. Braly | | Oil & Gas Operator | Dec 1991 |
| 4485 | C. F. Oil, A General Partnership | Lake Lotawana, MO 64086 | Oil Operator | Jun 2025 |
| 4486 | C. F. Sudduth | | Oil & Gas Operator | Dec 1988 |
| 4487 | C. H. C. Gerard | | Oil & Gas Operator | Jan 2025 |
| 4488 | C. H. Cuatro | | Gas Operator | Sep 1996 |
| 4489 | C. H. Todd, Inc. | Wichita, KS 67212 | Oil & Gas Operator | Dec 2019 |
| 4490 | C. I. McKown & Son, Inc. | Newton, WV 25266-0711 | Oil & Gas Operator | Dec 2021 |
| 4491 | C. J. Broome Oil Company | | Oil & Gas Operator | Jan 2020 |
| 4492 | C. J. Services | | Oil & Gas Operator | Sep 2016 |
| 4493 | C. L. Brown, III | | Oil Operator | Dec 1991 |
| 4494 | C. L. Brown, Inc. | | Oil Operator | Dec 1999 |
| 4495 | C. L. Morris | | Oil Operator | Feb 2004 |
| 4496 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 4497 | C. M. Frizzell | | Oil & Gas Operator | Mar 2014 |
| 4498 | C. M. Oil Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2016 |
| 4499 | C. M. Roberson | | Oil Operator | Jun 1984 |
| 4500 | C. O. Oil And Gas, LLC | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |