| 401 | Heartland Pumping | Hennessey, OK 73742-7311 | Oil & Gas Operator | Dec 2024 |
| 402 | Hemstead Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2001 |
| 403 | Hennessey Oil & Gas LLC | Hennessey, OK 73742-0212 | Oil & Gas Operator | Sep 2024 |
| 404 | Henry Gungoll Operating Inc | Enid, OK 73703 | Oil & Gas Operator | Jan 2025 |
| 405 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 406 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 407 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Mar 2025 |
| 408 | High Energy | Cushing, OK 74023 | Oil & Gas Operator | Dec 2024 |
| 409 | Highland Energy Co | Dallas, TX 75201 | Oil & Gas Operator | Jun 1994 |
| 410 | Highland Minerals, Inc. | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 411 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Dec 2024 |
| 412 | Hill Resources Inc | | Oil & Gas Operator | Nov 2022 |
| 413 | Hillshafer-Goodway Corp | | Oil & Gas Operator | Jun 1994 |
| 414 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 415 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | Jan 2025 |
| 416 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Jan 2025 |
| 417 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 418 | Honeymon Drilling Company LTD | Oklahoma City, OK 73147 | Oil & Gas Operator | Feb 1995 |
| 419 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 420 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 421 | Huitt Joe A Rev Trust | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2009 |
| 422 | Hulen Operating Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 423 | Hungerford Oil & Gas Inc | Helena, OK 73741 | Oil & Gas Operator | Nov 2000 |
| 424 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 425 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 426 | Hunton Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 427 | Husky Ventures Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2024 |
| 428 | Hux Oil Company LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jan 2025 |
| 429 | Hyalite Energy Corporation | Pampa, TX 79066 | Oil & Gas Operator | Dec 2024 |
| 430 | Impact Energy Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2025 |
| 431 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2025 |
| 432 | Infinity Hydrocarbons LLC | Houston, TX 77079 | Oil & Gas Operator | Aug 2022 |
| 433 | Inter-States Oil & Gas Inc | Edmond, OK 73003-0023 | Oil & Gas Operator | Apr 2020 |
| 434 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 435 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | Mar 2025 |
| 436 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Jan 2025 |
| 437 | Investors Resources Corp | Edmond, OK 73034 | Oil & Gas Operator | Jan 2025 |
| 438 | J & S Of Enid Inc | Enid, OK 73701 | Oil & Gas Operator | Jul 2019 |
| 439 | J B Hulet | | Oil & Gas Operator | Aug 2013 |
| 440 | J L Hajek Enterprises LLC | Ames, OK 73718 | Oil & Gas Operator | Dec 2024 |
| 441 | J O C Operating Inc | Fort Worth, TX 76102-6823 | Oil & Gas Operator | Feb 2021 |
| 442 | James Larry | Guthrie, OK 73044-9622 | Oil & Gas Operator | Dec 2024 |
| 443 | James Lawrence E Estate Of | Crescent, OK 73028-9304 | Oil & Gas Operator | Nov 2021 |
| 444 | Jan Oil Company | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 445 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Jan 2025 |
| 446 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 447 | Jayhawk Mineral Investments LLC | Edmond, OK 73034-8874 | Oil & Gas Operator | Dec 2024 |
| 448 | JB Petroleum Corporation | Purcell, OK 73080-6954 | Oil & Gas Operator | Sep 2018 |
| 449 | Jec Operating LLC | Oklahoma City, OK 73114-2717 | Oil & Gas Operator | Dec 2024 |
| 450 | Jenex Operating Company | The Woodlands, TX 77380-164280209 | Oil & Gas Operator | May 2019 |
| 451 | Jerry Sanner Oil Properties Inc | Enid, OK 73701 | Oil & Gas Operator | Jan 2025 |
| 452 | Jet Oil Co12/Ofb See 18649 | | Oil & Gas Operator | Jul 2007 |
| 453 | Jhatco Inc | Enid, OK 73701 | Oil & Gas Operator | Jan 2025 |
| 454 | Jico Exploration Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2004 |
| 455 | JKB Resources LLC | Stigler, OK 74462 | Oil & Gas Operator | Dec 2024 |
| 456 | Jma Energy Company, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2025 |
| 457 | JMK Energy Company | Hennessey, OK 73742-0518 | Oil & Gas Operator | Jun 2016 |
| 458 | JN Production LLP | Guthrie, OK 73028 | Oil & Gas Operator | Jan 2025 |
| 459 | Johnson E Lyle | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2024 |
| 460 | Johnson Horace T | Tulsa, OK 74105 | Oil & Gas Operator | Dec 2000 |
| 461 | Jones & Pellow Oil Co | Oklahoma City, OK 73118-1115 | Oil & Gas Operator | Feb 2015 |
| 462 | Jones Energy LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2024 |
| 463 | Jones Oil Company LLC (The) | Duncan, OK 73533-4995 | Oil & Gas Operator | Jan 2025 |
| 464 | Jrhop Inc | Norman, OK 73072-4615 | Oil & Gas Operator | Dec 2015 |
| 465 | K & F Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Dec 2021 |
| 466 | K & M Oil Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Dec 2024 |
| 467 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Dec 2024 |
| 468 | Kahan And Associates, Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2024 |
| 469 | Kahan Louis | Tulsa, OK 74101 | Oil & Gas Operator | May 1994 |
| 470 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 471 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Dec 2024 |
| 472 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 473 | Keener Energy Company | Tulsa, OK 74103-4043 | Oil & Gas Operator | Jan 2014 |
| 474 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 475 | Keesee Paul Inc | Holdenville, OK 74848 | Oil & Gas Operator | Nov 1998 |
| 476 | Keno Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 1995 |
| 477 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 478 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 479 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 480 | Key Energy Services Inc | Midland, TX 79705-5540 | Oil Operator | Jan 2008 |
| 481 | Kibtec Oil & Gas Inc | Cashion, OK 73016 | Oil & Gas Operator | Aug 2024 |
| 482 | King Energy LLC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Jan 2025 |
| 483 | Kingfisher CSG Pullr & Const Inc | Hennessey, OK 73742-0024 | Oil & Gas Operator | Apr 2014 |
| 484 | Kingfisher Resources Inc | Clinton, OK 73601 | Oil & Gas Operator | Jan 2025 |
| 485 | Kirk David | Midland, TX 79705 | Oil & Gas Operator | Dec 2024 |
| 486 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 487 | Kloberdanz, Paul E. | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2021 |
| 488 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 489 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 490 | Kodiak Oil & Gas Exploration Inc | Oklahoma City, OK 73134-1046 | Oil & Gas Operator | Dec 2024 |
| 491 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 492 | KPL Production Company LLC | Oklahoma City, OK 73112-4709 | Oil & Gas Operator | Feb 2017 |
| 493 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Dec 2024 |
| 494 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 495 | L & L Smith Energy Corporation | Muskogee, OK 74403-8479 | Oil & Gas Operator | Jan 2023 |
| 496 | L & N Exploration Inc | | Oil & Gas Operator | Jul 2013 |
| 497 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 498 | L And R Oil Company | Oakley, KS 67748 | Oil & Gas Operator | Jan 2004 |
| 499 | L.L. Oil Company | Freer, TX 78357 | Oil & Gas Operator | Mar 2025 |
| 500 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |