| 6401 | Consolidated Oil Well Services, Inc | Chanute, KS 66720 | Oil Operator | Jan 2008 |
| 6402 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 6403 | Consolidated Petro PTNRS I, LLC | Austin, TX 78759 | Oil & Gas Operator | Mar 2003 |
| 6404 | Consolidated Petrol Corp | Columbus, OH 43215 | Oil & Gas Operator | Dec 1995 |
| 6405 | Consolidated Production Inc. | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 6406 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 6407 | Consolidated Res Of Amer | Cincinnati, OH 45208 | Oil & Gas Operator | Dec 1996 |
| 6408 | Consolidated Resources Corp | Shawnee, OK 74801 | Oil & Gas Operator | Sep 2014 |
| 6409 | Consolidated Resources Inc | | Oil & Gas Operator | May 2004 |
| 6410 | Consolidation Coal Company | Saint Clairsville, OH 43950-8742 | Oil & Gas Operator | Dec 2020 |
| 6411 | Consortium Energy LLC | Tallmadge, OH 44278 | Oil & Gas Operator | Dec 2024 |
| 6412 | Constitution Gas Transport Co., Inc. | Salt Lake City, UT 84124-1110 | Gas Operator | Jun 2012 |
| 6413 | Constitution Investment Co LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 6414 | Constitution Petroleum | Salt Lake City, UT 84124-1110 | Oil & Gas Operator | Dec 2008 |
| 6415 | Consumers Energy Co | | Oil & Gas Operator | Apr 2010 |
| 6416 | Contango Midstream Company | Houston, TX 77002-3023 | Oil & Gas Operator | Jun 2025 |
| 6417 | Contango Operators, Inc. | Houston, TX 77098 | Oil & Gas Operator | Dec 2022 |
| 6418 | Contango Operators, LLC | | Oil & Gas Operator | Nov 2024 |
| 6419 | Contango Resources Company | | Oil & Gas Operator | Mar 2009 |
| 6420 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Oct 2025 |
| 6421 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 6422 | Contango Rocky Mountain Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2020 |
| 6423 | Continental Brok | | Oil Operator | Oct 1994 |
| 6424 | Continental Ener | | Oil & Gas Operator | Dec 1996 |
| 6425 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 6426 | Continental Energy Operating LLC | Tulsa, OK 74114-1302 | Oil & Gas Operator | Jun 2025 |
| 6427 | Continental Expl | | Oil Operator | Sep 1991 |
| 6428 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Oct 2025 |
| 6429 | Continental Exploration, Inc. | | Oil Operator | Dec 2001 |
| 6430 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 6431 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 6432 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 6433 | Continental Oil | | Oil Operator | Jun 1985 |
| 6434 | Continental Oil & Gas Co. Inc. | | Oil & Gas Operator | Jul 1997 |
| 6435 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 6436 | Continental Oil Co. | Durango, CO 81301 | Oil & Gas Operator | Dec 1983 |
| 6437 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 6438 | Continental Petroleum, LLC | | Oil & Gas Operator | Oct 2013 |
| 6439 | Continental Production Co LLC | Greenwood VIllage, CO 80155 | Oil & Gas Operator | Aug 2012 |
| 6440 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 6441 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 6442 | Continental-Emsco Co | Hobbs, NM 88241 | Oil & Gas Operator | Jun 1995 |
| 6443 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Oct 2025 |
| 6444 | Continuum Midstream, LLC | Tulsa, OK 74136 | Oil Operator | Mar 2025 |
| 6445 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 6446 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 6447 | Contour Expl And Prod, LLC | Dallas, TX 75204 | Oil & Gas Operator | Oct 2025 |
| 6448 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 6449 | Contract Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2012 |
| 6450 | Contract Oil & Gas Service Co. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2007 |
| 6451 | Contrast Energy, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 6452 | Contreras Al Consultants Inc | Oklahoma City, OK 73113-0762 | Oil & Gas Operator | Oct 2020 |
| 6453 | Converse Oil Corp. | | Oil Operator | Dec 2010 |
| 6454 | Convert Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2019 |
| 6455 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 6456 | Conway Energy Oper Services Inc. | San Diego, TX 78384 | Oil & Gas Operator | Oct 2025 |
| 6457 | Cook D L | Holliday, TX 76366 | Oil & Gas Operator | Dec 2008 |
| 6458 | Cook Energy Inc | Cooksburg, PA 16217-0054 | Oil & Gas Operator | Dec 2004 |
| 6459 | Cook Exploration Co. | Longview, TX 75602 | Oil & Gas Operator | Oct 2025 |
| 6460 | Cook Inlet Energy, LLC. | | Oil & Gas Operator | Aug 2025 |
| 6461 | Cook L D | Bartlesville, OK 74005-2306 | Oil & Gas Operator | Nov 2005 |
| 6462 | Cook Marshall Operating, Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 1995 |
| 6463 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 6464 | Cook Operating C | | Oil Operator | May 1987 |
| 6465 | Cook Production LLC | | Oil Operator | Jan 2025 |
| 6466 | Cook Robert L | Rockwall, TX 75087-0892 | Oil & Gas Operator | Mar 2015 |
| 6467 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 6468 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 6469 | Cook, James A. | Augusta, KS 67010 | Oil Operator | Jul 1997 |
| 6470 | Cook, Kenneth D. Operator | Midland, TX 79707 | Oil Operator | Oct 2025 |
| 6471 | Cook, Lee J. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 6472 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Oct 2025 |
| 6473 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 6474 | Cooke Energy Company | San Antonio, TX 78250 | Oil & Gas Operator | Jul 2012 |
| 6475 | Cooke, Donald E./Lee Wanda | Coffeyville, KS 67331 | Oil Operator | Dec 2001 |
| 6476 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 6477 | Coolidge, G. B., Inc. | Shelby, MT 59474 | Oil & Gas Operator | Aug 2016 |
| 6478 | Coolidge, Paul | | Oil Operator | Jul 2025 |
| 6479 | Coolidge, Tim & Billiette | Sunburst, MT 59482 | Oil Operator | Jul 2025 |
| 6480 | Coolidge, Timothy J & Billiette Nebel | Kevin, MT 59454 | Oil Operator | Jul 2025 |
| 6481 | Coolspring Gas & Oil Co LLC | Coolspring, PA 15730-8524 | Gas Operator | Dec 2024 |
| 6482 | Coomer, Mitchell | Columbia, KY 42728 | Oil Operator | Dec 2023 |
| 6483 | Coon Creek Gas Inc | | Oil & Gas Operator | Mar 2014 |
| 6484 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 6485 | Cooper & Brain Inc. | | Oil & Gas Operator | Aug 2025 |
| 6486 | Cooper A L & Mae C | | Oil & Gas Operator | Jan 2001 |
| 6487 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 6488 | Cooper John T | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 6489 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 6490 | Cooper Mineral Group Inc | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2004 |
| 6491 | Cooper Oil & Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2010 |
| 6492 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 6493 | Cooper Oil Company | Andover, KS 67002 | Oil Operator | Oct 1997 |
| 6494 | Cooper Oil Inc | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 6495 | Cooper Operating | Olney, TX 76374 | Oil Operator | Apr 2007 |
| 6496 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2025 |
| 6497 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 6498 | Cooper Service Co. | | Oil & Gas Operator | Nov 2024 |
| 6499 | Cooper, Glenn W. Oil & Gas | Seymour, TX 76380 | Oil & Gas Operator | Feb 2000 |
| 6500 | Cooper, J. M. | Winfield, KS 67119 | Oil Operator | Oct 1997 |