| 501 | J.R. Oil Company | Houston, TX 77007 | Oil & Gas Operator | Jul 2019 |
| 502 | J/A Productions LLC | Kellyville, OK 74039-0544 | Oil Operator | Oct 2025 |
| 503 | Jac-Mac Energy Corporation | Oklahoma City, OK 73170 | Oil & Gas Operator | Sep 2025 |
| 504 | Jackson L B Production Co | Tulsa, OK 74193-0001 | Oil & Gas Operator | Aug 2013 |
| 505 | Jacobs Jean | Hurdle Mills, NC 27541 | Oil & Gas Operator | May 2013 |
| 506 | James Johnny | Sapulpa, OK 74066 | Oil & Gas Operator | Oct 2025 |
| 507 | James Raymond L | Sapulpa, OK 74066-8785 | Oil & Gas Operator | Oct 2025 |
| 508 | Jason Petroleum Corporation | Tulsa, OK 74170-0622 | Oil & Gas Operator | Dec 1998 |
| 509 | Jasper Oil LLC | Bristow, OK 74010-3907 | Oil & Gas Operator | Sep 2025 |
| 510 | Jay Development Corporation | Dallas, TX 75420 | Oil & Gas Operator | Jun 1992 |
| 511 | Jay Energy Corporation | Dallas, TX 75240 | Oil & Gas Operator | Jan 2007 |
| 512 | JCN Petroleum Corporation | Edmond, OK 73083-3357 | Oil & Gas Operator | Jun 2004 |
| 513 | Jeanie Oil Inc | Drumright, OK 74023 | Oil & Gas Operator | Feb 1999 |
| 514 | Jec Operating LLC | Oklahoma City, OK 73114-2717 | Oil & Gas Operator | Oct 2025 |
| 515 | Jenkins Walter D | Oklahoma City, OK 73156-1022 | Oil & Gas Operator | Mar 2011 |
| 516 | Jericho Exploration | Weleetka, OK 74880-0704 | Oil & Gas Operator | Sep 2025 |
| 517 | Jewell Consulting Inc | Bixby, OK 74008 | Oil & Gas Operator | Dec 2022 |
| 518 | Jimgas Inc | Magnolia, TX 77355 | Oil & Gas Operator | May 2016 |
| 519 | JMC Exploration Inc | Dallas, TX 75225-5803 | Gas Operator | Jan 2007 |
| 520 | Johnson Exploration Company | Oklahoma City, OK 73102-7008 | Oil & Gas Operator | Jun 2015 |
| 521 | Johnson Exploration Inc | Sapulpa, OK 74067-0289 | Oil & Gas Operator | Feb 2002 |
| 522 | Joie Oil & Gas Inc | Sapulpa, OK 74067 | Oil & Gas Operator | Dec 1998 |
| 523 | Jones Bo Enterprises Inc | Tyler, TX 75706 | Oil & Gas Operator | Jan 1994 |
| 524 | Jones Oil Company | Ardmore, OK 73402-1389 | Oil & Gas Operator | Aug 2022 |
| 525 | Jones Raymond H Family Trust | Drumright, OK 74030-1204 | Oil & Gas Operator | Mar 2023 |
| 526 | Jones Tank Trucks Inc | Cushing, OK 74023-8947 | Oil & Gas Operator | Dec 2000 |
| 527 | Jones, L. E. Production Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2014 |
| 528 | Jovian Petroleum Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2016 |
| 529 | JSD Resources Corporation | Barnsdall, OK 74002-3272 | Oil & Gas Operator | Jul 2025 |
| 530 | Juno Operating Company II LLC | Plano, TX 75093 | Oil & Gas Operator | Sep 2018 |
| 531 | Jva Operating Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2021 |
| 532 | K & L Operating LLC | Cushing, OK 74023-6189 | Oil & Gas Operator | Oct 2025 |
| 533 | K Spencer LLC | Drumright, OK 74030-5825 | Oil & Gas Operator | Sep 2019 |
| 534 | K-C Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jan 2013 |
| 535 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 536 | Kaiser Investments | Sand Springs, OK 74063 | Oil & Gas Operator | Sep 2003 |
| 537 | Kana Resources, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Aug 2003 |
| 538 | Kanokla Oil & Gas Corporation | Wellington, KS 67152-0444 | Oil & Gas Operator | Oct 2025 |
| 539 | Kantor Oil Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2025 |
| 540 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 541 | Katy Drilling Corporation | Tulsa, OK 74146-3717 | Oil & Gas Operator | Apr 2020 |
| 542 | Kay Production Company | Seminole, OK 74868 | Oil & Gas Operator | Sep 2025 |
| 543 | Keener Oil & Gas Company | Tulsa, OK 74119-4416 | Oil & Gas Operator | Oct 2025 |
| 544 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 545 | Kellogg Oil Company | Henryetta, OK 74437 | Oil & Gas Operator | Oct 2024 |
| 546 | Kelmar Oil Company | Chickasha, OK 73018 | Oil & Gas Operator | Sep 2025 |
| 547 | Kemmerer Company Inc | Tulsa, OK 74136-7027 | Oil & Gas Operator | Feb 2025 |
| 548 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 549 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Oct 2025 |
| 550 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 551 | Ketal Oil Producing Company | Fort Worth, TX 76102 | Gas Operator | Sep 1995 |
| 552 | Keystone Oil And Gas Company LLC | Collinsville, OK 74021 | Oil & Gas Operator | Sep 2025 |
| 553 | Kidd Bill R | Bristow, OK 74010-9721 | Oil Operator | Jan 2013 |
| 554 | Kiefer Oil And Gas Co Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Apr 2011 |
| 555 | Kingdom Resources Inc | Frisco, TX 75033-3673 | Oil & Gas Operator | Jun 2023 |
| 556 | Kiska Oil Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2019 |
| 557 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Oct 2025 |
| 558 | Knife Oil Company Inc | Cushing, OK 74023-1347 | Oil & Gas Operator | Aug 2000 |
| 559 | Koby Oil Company LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 560 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 561 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 562 | Kopco Inc | Caney, KS 67333 | Oil & Gas Operator | Oct 2025 |
| 563 | Kraker Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 1995 |
| 564 | Krotzer Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Oct 2025 |
| 565 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Oct 2025 |
| 566 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 567 | Labo Oil Company Inc | Drumright, OK 74030-5619 | Oil & Gas Operator | Jul 2025 |
| 568 | Lackey Danny | Kiefer, OK 74041-0702 | Oil & Gas Operator | Oct 2022 |
| 569 | Lackey WM Oil & Gas Oper Co | Shawnee, OK 74801 | Oil & Gas Operator | Jan 1994 |
| 570 | Lahoma Production Inc | Jenks, OK 74037 | Oil & Gas Operator | Oct 2025 |
| 571 | Lakeland Pipeline Inc | Hominy, OK 74035-1006 | Oil & Gas Operator | Jun 2023 |
| 572 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Dec 2025 |
| 573 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Oct 2025 |
| 574 | Lambdin William H | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 1998 |
| 575 | Lamberton Oil Co Inc | Tulsa, OK 74107 | Oil & Gas Operator | May 2013 |
| 576 | Lamberton W J | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2015 |
| 577 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Oct 2025 |
| 578 | Landers & Waldman Inc | Okemah, OK 74859-0660 | Oil & Gas Operator | May 2013 |
| 579 | Landmark Operating Company | Welty, OK 74833-3923 | Oil Operator | Aug 2015 |
| 580 | Lansden Operating Co LLC | Norman, OK 73070 | Oil & Gas Operator | Dec 1997 |
| 581 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 582 | Lar-Mie Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 1998 |
| 583 | Lariat Energy & Supply Co Inc | Hulbert, OK 74441 | Oil & Gas Operator | Jun 2025 |
| 584 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 585 | Larkin Energy Company Inc | Sasakwa, OK 74867 | Oil & Gas Operator | May 2022 |
| 586 | Larry Wolff Dba Wolff'S Oilfield Service | Cushing, OK 74023-9789 | Oil & Gas Operator | Oct 2025 |
| 587 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 588 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 589 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 590 | Lauck & Associates | Walnut Creek, CA 91789 | Oil & Gas Operator | Oct 2025 |
| 591 | Lawrence James Oil Prop Inc | Catoosa, OK 74015 | Oil & Gas Operator | Feb 2012 |
| 592 | Layton Oil Co | | Oil Operator | Feb 1994 |
| 593 | LBJ Production Inc | Okmulgee, OK 74447 | Oil Operator | Nov 1998 |
| 594 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Oct 2025 |
| 595 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 596 | Leasehold Management Corp | Oklahoma City, OK 73107 | Oil & Gas Operator | Nov 2024 |
| 597 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 598 | Lee Of Tulsa Oil & Gas Inc | Tulsa, OK 74114-5634 | Oil & Gas Operator | Dec 2021 |
| 599 | Leg Up Operating Company LLC | Tulsa, OK 74135 | Oil Operator | Oct 2025 |
| 600 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |