| 401 | J & S Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2022 |
| 402 | J C Petroleum Inc | Chickasha, OK 73023-1433 | Oil & Gas Operator | Dec 2013 |
| 403 | J D Sutton Inc | Loco, OK 73442-9701 | Oil & Gas Operator | Feb 2025 |
| 404 | Jack Oil Company | Baird, TX 79504 | Oil & Gas Operator | Feb 2025 |
| 405 | Jackson J M | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2005 |
| 406 | James Oil Company | Compton, CA 90221-4399 | Oil & Gas Operator | Nov 2008 |
| 407 | Jan Oil Company | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 408 | Jasmine Inc | Duncan, OK 73534-1103 | Oil & Gas Operator | Jun 2017 |
| 409 | Jaycar Production LLC | Comanche, OK 73529-4670 | Oil Operator | Feb 2025 |
| 410 | JB Smith Operating Co LLC | Duncan, OK 73533-4618 | Oil Operator | Feb 2025 |
| 411 | Jenkins & Sons Production, Inc. | Arkansas City, KS 67005 | Oil Operator | Jul 2014 |
| 412 | Jenkins Charley W Dba Jenkins Oil Company | Duncan, OK 73533-3204 | Oil Operator | Mar 2015 |
| 413 | Jenkins Energy Company | Ardmore, OK 73401-0714 | Oil Operator | Oct 2024 |
| 414 | Jerry Sanner Oil Properties Inc | Enid, OK 73701 | Oil & Gas Operator | Feb 2025 |
| 415 | Jim Bennett Oil Co Inc | | Oil & Gas Operator | Mar 2019 |
| 416 | Jimmy R Chatham LLC | Healdton, OK 73438 | Oil & Gas Operator | Feb 2025 |
| 417 | Jma Energy Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2025 |
| 418 | Jobe Oil & Gas | Comanche, OK 73529-0244 | Oil & Gas Operator | Jan 2025 |
| 419 | Johnson E Lyle | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2025 |
| 420 | Johnson Oil Company | Duncan, OK 73533 | Oil Operator | Feb 2025 |
| 421 | Jones & Pellow Oil Co | Oklahoma City, OK 73118-1115 | Oil & Gas Operator | Feb 2015 |
| 422 | Jones Brent | Duncan, OK 73533-6608 | Oil & Gas Operator | Nov 2015 |
| 423 | Jones III Thomas J | Duncan, OK 73533-4995 | Oil & Gas Operator | Dec 2018 |
| 424 | Jones Jay D Revocable Inter VIvos Trust | Duncan, OK 73534 | Oil & Gas Operator | Mar 2015 |
| 425 | Jones Oil Company | Ardmore, OK 73402-1389 | Oil & Gas Operator | Aug 2022 |
| 426 | Jones Oil Company LLC (The) | Duncan, OK 73533-4995 | Oil & Gas Operator | Jan 2025 |
| 427 | Jones, L. E. Production Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2014 |
| 428 | Jones, Margo B | | Oil Operator | Nov 1998 |
| 429 | Jwimco LLC | Dallas, TX 75229 | Oil & Gas Operator | Jan 2025 |
| 430 | K & M Oil Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 431 | K L Production Services LLC | Duncan, OK 73533-3409 | Oil & Gas Operator | Nov 2019 |
| 432 | K Phil Fleetwood Oil Properties LLC | Marlow, OK 73055 | Oil & Gas Operator | Feb 2025 |
| 433 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Feb 2025 |
| 434 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 435 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2025 |
| 436 | Kaneb Operating Company | Dallas, TX 75265-0283 | Oil & Gas Operator | Dec 1995 |
| 437 | Kardaleff Steven T | Lawton, OK 73507-8471 | Oil Operator | Mar 2015 |
| 438 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 439 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 440 | Kechi Energy LLC | Chickasha, OK 73018 | Oil & Gas Operator | Jan 2025 |
| 441 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 442 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 443 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jan 2025 |
| 444 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 445 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 446 | Key Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Dec 2021 |
| 447 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 448 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2025 |
| 449 | Keystone Production Company | Duncan, OK 73533-9117 | Oil & Gas Operator | May 2005 |
| 450 | Kiamichi Resources Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | Feb 2016 |
| 451 | Kiester Operating Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jan 2025 |
| 452 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Jan 2025 |
| 453 | Kingfisher Resources Inc | Clinton, OK 73601 | Oil & Gas Operator | Feb 2025 |
| 454 | Kirk Billie E | Morris, OK 74445 | Oil & Gas Operator | Jan 2025 |
| 455 | Kirk David | Midland, TX 79705 | Oil & Gas Operator | Jan 2025 |
| 456 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 457 | KLBW Partners LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Feb 2025 |
| 458 | Kleen Oilfield Services Co | Velma, OK 73491-0178 | Oil & Gas Operator | Feb 2025 |
| 459 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Feb 2025 |
| 460 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 461 | Knutson Production Company | Loco, OK 73442-9706 | Oil & Gas Operator | Feb 2025 |
| 462 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 463 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Apr 2025 |
| 464 | Kolar Petroleum Inc | Oklahoma City, OK 73162-1509 | Oil & Gas Operator | Jun 2007 |
| 465 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Jan 2025 |
| 466 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 467 | L & F Oil Company | Duncan, OK 73533-3636 | Oil Operator | Jun 2009 |
| 468 | L And L Production Company | Skellytown, TX 79080 | Oil & Gas Operator | Sep 1996 |
| 469 | L E Jones Operating Inc | Duncan, OK 73534 | Oil & Gas Operator | Feb 2025 |
| 470 | Lakota Oil & Gas | Comanche, OK 73529-9602 | Oil & Gas Operator | May 2014 |
| 471 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Jan 2025 |
| 472 | Lambert Company LLC | Healdton, OK 73438-0962 | Oil & Gas Operator | Jan 2025 |
| 473 | Lambert Company The | Healdton, OK 73438-0962 | Oil & Gas Operator | Feb 2023 |
| 474 | Lamberton W J | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2015 |
| 475 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Feb 2025 |
| 476 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 477 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Apr 2025 |
| 478 | Larson Exploration Company | Tulsa, OK 74136-4939 | Oil & Gas Operator | Jul 2016 |
| 479 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 480 | Latigo Drilling Corporation | Duncan, OK 73533 | Oil & Gas Operator | Feb 2025 |
| 481 | Latigo Oil And Gas Inc | Woodward, OK 73801 | Oil & Gas Operator | Feb 2025 |
| 482 | Lavrco Energie Inc | Duncan, OK 73533 | Oil & Gas Operator | Oct 2024 |
| 483 | Lawrence Hot Oil Service | Loco, OK 73442 | Oil & Gas Operator | Feb 2025 |
| 484 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Feb 2025 |
| 485 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 486 | Le Norman Partners LLC | Duncan, OK 73533-9523 | Oil & Gas Operator | Feb 2012 |
| 487 | Ledford Jan Oil & Gas | Duncan, OK 73533-3210 | Oil Operator | Dec 2024 |
| 488 | Lee Jr W E | Beggs, OK 74421-2683 | Oil & Gas Operator | May 2013 |
| 489 | Lee Ron | Emory, TX 75440 | Oil Operator | Feb 2025 |
| 490 | Leed Energy LLC | Purcell, OK 73080-1383 | Oil & Gas Operator | Jan 2025 |
| 491 | Lewis J K | Duncan, OK 73534-1742 | Oil & Gas Operator | Apr 2015 |
| 492 | Lewis Oil Operations LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Jan 2025 |
| 493 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 494 | Likins-Foster Honolulu Corp | Foster City, CA 94404 | Oil & Gas Operator | Feb 2015 |
| 495 | Lil Dab Petroleum Inc | Duncan, OK 73533 | Oil Operator | Feb 2025 |
| 496 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 497 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 498 | Linam Harry Dba Sooner State Production | Marlow, OK 73055-0583 | Oil & Gas Operator | Apr 2015 |
| 499 | Little O Oil Company | Velma, OK 73091-0425 | Oil & Gas Operator | Apr 2015 |
| 500 | Loco Oil Company | Loco, OK 73442 | Oil Operator | Feb 1993 |