| 401 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 402 | Hooks Dwain | Tatums, OK 73487 | Oil & Gas Operator | Oct 2024 |
| 403 | Horton Mary | Ratliff City, OK 73481 | Oil Operator | May 2020 |
| 404 | Howard & Taylor | Wynnewood, OK 73098-9234 | Oil & Gas Operator | Jan 2025 |
| 405 | HRC Production Co | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 406 | Huck Farms LLC | Stratford, OK 74872 | Oil & Gas Operator | Jan 2025 |
| 407 | Hunt Engineering Inc | Norman, OK 73069-4093 | Oil & Gas Operator | Feb 2019 |
| 408 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 409 | Hunton Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2025 |
| 410 | Hux Oil Company LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jan 2025 |
| 411 | Hylmn LLC | Wills Point, TX 75169 | Oil Operator | Jun 2022 |
| 412 | Hyperion Oil & Gas LLC | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 413 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Apr 2025 |
| 414 | Indian Territory Operating LLC | Salado, TX 76571 | Oil & Gas Operator | Jan 2024 |
| 415 | Infinity Hydrocarbons LLC | Houston, TX 77079 | Oil & Gas Operator | Aug 2022 |
| 416 | Inter-States Oil & Gas Inc | Edmond, OK 73003-0023 | Oil & Gas Operator | Apr 2020 |
| 417 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Jan 2025 |
| 418 | Iron Sights Operating Inc | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2022 |
| 419 | Iron Star Energy LLC | Houston, TX 77037-1142 | Oil & Gas Operator | Jan 2025 |
| 420 | J & J Oil Company | Luling, TX 78648 | Oil & Gas Operator | Mar 2015 |
| 421 | J & J Oil Company LLC | Lubbock, TX 79424 | Oil Operator | Apr 2025 |
| 422 | J-Tag Public Saltwater | Healtdon, OK 73438 | Oil Operator | Sep 1998 |
| 423 | Jackson, Jeral W. Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2004 |
| 424 | Jan Oil Company | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 425 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Feb 2025 |
| 426 | Jaquess W D "Bud" | Ada, OK 74820 | Oil & Gas Operator | Jan 2018 |
| 427 | Jasmine Inc | Duncan, OK 73534-1103 | Oil & Gas Operator | Jun 2017 |
| 428 | Jay B Harden | | Oil Operator | Jan 2025 |
| 429 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 430 | JCT #1 LTD | Fairview, OK 73737-9614 | Oil Operator | Sep 2006 |
| 431 | Jec Operating LLC | Oklahoma City, OK 73114-2717 | Oil & Gas Operator | Jan 2025 |
| 432 | Jerico Resources LLC | Seminole, OK 74868-6538 | Oil & Gas Operator | Apr 2020 |
| 433 | Jerry Sanner Oil Properties Inc | Enid, OK 73701 | Oil & Gas Operator | Feb 2025 |
| 434 | Jerry Scott Drilling Company Inc | Ada, OK 74821 | Oil & Gas Operator | Dec 2024 |
| 435 | Jet Oil Co12/Ofb See 18649 | | Oil & Gas Operator | Jul 2007 |
| 436 | Jetson Operating Inc | Ada, OK 74820 | Oil & Gas Operator | Sep 2024 |
| 437 | Jimmy R Chatham LLC | Healdton, OK 73438 | Oil & Gas Operator | Feb 2025 |
| 438 | Joe B Clifton Exploration Inc | Pauls Valley, OK 73075 | Oil & Gas Operator | Apr 2022 |
| 439 | Johnson Exploration Company | Oklahoma City, OK 73102-7008 | Oil & Gas Operator | Jun 2015 |
| 440 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2025 |
| 441 | Jones & Pellow Oil Co | Oklahoma City, OK 73118-1115 | Oil & Gas Operator | Feb 2015 |
| 442 | Jones Babe Inc | Floydada, TX 79235-0180 | Oil & Gas Operator | May 2019 |
| 443 | Jones Bo Enterprises Inc | Tyler, TX 75706 | Oil & Gas Operator | Jan 1994 |
| 444 | Jones Energy LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2025 |
| 445 | Jones III Thomas J | Duncan, OK 73533-4995 | Oil & Gas Operator | Dec 2018 |
| 446 | Jones Oil Company LLC (The) | Duncan, OK 73533-4995 | Oil & Gas Operator | Jan 2025 |
| 447 | Jones, L. E. Production Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2014 |
| 448 | Jubilee Exploration LLC | Ardmore, OK 73401-7526 | Oil & Gas Operator | Dec 2024 |
| 449 | K & F Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Dec 2021 |
| 450 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Feb 2025 |
| 451 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 452 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2025 |
| 453 | Kansas Gas Purchasing | Salina, KS 67401 | Oil & Gas Operator | May 1995 |
| 454 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2025 |
| 455 | Keesee Paul Inc | Holdenville, OK 74848 | Oil & Gas Operator | Nov 1998 |
| 456 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 457 | Kelley James C Estate | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 458 | Kelton Oil & Gas Co | Wheeler, TX 79096 | Oil Operator | Jun 1991 |
| 459 | Kepco. Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 460 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 461 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jan 2025 |
| 462 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 463 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 464 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 465 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 466 | Kidd Bill R | Bristow, OK 74010-9721 | Oil Operator | Jan 2013 |
| 467 | Kiester Operating Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jan 2025 |
| 468 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Jan 2025 |
| 469 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 470 | Kirrie Oil Company LLC | Oklahoma City, OK 73113-0125 | Oil & Gas Operator | Jan 2025 |
| 471 | Kiska Oil Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2019 |
| 472 | KLBW Partners LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Feb 2025 |
| 473 | Kloberdanz, Paul E. | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2021 |
| 474 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 475 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 476 | Kybenco Disposals LLC | Maysville, OK 73052 | Oil Operator | Sep 2022 |
| 477 | L E Jones Operating Inc | Duncan, OK 73534 | Oil & Gas Operator | Feb 2025 |
| 478 | Lackey Raymond R | Lindsay, OK 73052 | Oil & Gas Operator | Jun 2015 |
| 479 | Lackey Raymond R & Assoc | Sulphur, OK 73086 | Oil & Gas Operator | Jan 2025 |
| 480 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 481 | Ladder Energy Company | Tulsa, OK 74120-4281 | Oil & Gas Operator | Jan 2018 |
| 482 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 483 | Lam Financial Holdings LTD | Denver, CO 80237 | Oil Operator | Feb 2025 |
| 484 | Lambdin William H | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 1998 |
| 485 | Lambert Company LLC | Healdton, OK 73438-0962 | Oil & Gas Operator | Jan 2025 |
| 486 | Lambert Company The | Healdton, OK 73438-0962 | Oil & Gas Operator | Feb 2023 |
| 487 | Lamima Corporation | Ardmore, OK 73401 | Oil Operator | Nov 1994 |
| 488 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Feb 2025 |
| 489 | Landmark Exploration Co | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2013 |
| 490 | Landmark Production Company | MC Gregor, TX 76657 | Oil & Gas Operator | Oct 2010 |
| 491 | Langley Harold | Graham, OK 73437 | Oil Operator | Jan 2025 |
| 492 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 493 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 494 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Apr 2025 |
| 495 | Larkin Energy Company Inc | Sasakwa, OK 74867 | Oil & Gas Operator | May 2022 |
| 496 | Larkin Oil Co | Sasakwa, OK 74867 | Oil & Gas Operator | Aug 2015 |
| 497 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 498 | Latigo Drilling Corporation | Duncan, OK 73533 | Oil & Gas Operator | Feb 2025 |
| 499 | Lavrco Energie Inc | Duncan, OK 73533 | Oil & Gas Operator | Oct 2024 |
| 500 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |