| 401 | Great Horned Owls, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 402 | Great Plains Operating Inc | Bristow, OK 74010 | Oil & Gas Operator | Dec 1998 |
| 403 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Apr 2025 |
| 404 | Green Energy Company | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 405 | Green Operating Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 406 | Green William G | Jenks, OK 74037-3233 | Oil & Gas Operator | Apr 2020 |
| 407 | Greenwood Janet | Mannford, OK 74044 | Oil Operator | Apr 2014 |
| 408 | Greg Hall Oil & Gas LLC | Norman, OK 73072 | Oil & Gas Operator | May 2025 |
| 409 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 410 | Ground Development Company Inc | Dallas, TX 75229-0377 | Oil & Gas Operator | Jan 2013 |
| 411 | Grubb Ronald J | Clinton, OK 73601-0906 | Oil & Gas Operator | Aug 2013 |
| 412 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 413 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 414 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 415 | H & D Operating Company | Refugio, TX 78377 | Oil & Gas Operator | May 2015 |
| 416 | H & H Oil Productions | Tulsa, OK 74145 | Oil Operator | Jul 1999 |
| 417 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 418 | H L L Inc | Scottsdale, AZ 85251 | Oil & Gas Operator | Jan 2007 |
| 419 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 420 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 421 | Hail Petroleum Corporation | Garland, TX 75047-5036 | Oil Operator | Mar 1997 |
| 422 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Nov 2018 |
| 423 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 424 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 425 | Hallmark Resources, Inc | Stilwell, OK 74960-0312 | Oil & Gas Operator | Sep 2020 |
| 426 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | May 2025 |
| 427 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | May 2025 |
| 428 | Har-Ken Oil Co | | Oil & Gas Operator | Dec 2021 |
| 429 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 430 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 431 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2025 |
| 432 | Hartline Tom | Drumright, OK 74030 | Oil Operator | Mar 2025 |
| 433 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 434 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | May 2025 |
| 435 | Heinrich Production Co Inc | Lubbuck, TX 79424 | Oil Operator | Dec 2024 |
| 436 | Hellard Elmer J | Sapulpa, OK 74066 | Oil & Gas Operator | Jun 2025 |
| 437 | Helmco LTD | Kiefer, OK 74041-0397 | Oil & Gas Operator | Jan 2007 |
| 438 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | May 2025 |
| 439 | Henderson Exploration Company | Tulsa, OK 74120 | Oil & Gas Operator | May 2013 |
| 440 | Henry Oil & Gas Inc | Oklahoma City, OK 73127 | Oil & Gas Operator | Jul 2009 |
| 441 | Henry Petroleum Inc | Oklahoma City, OK 73162-1757 | Oil & Gas Operator | Sep 2019 |
| 442 | Henry Wat Oil Company | Tulsa, OK 74101 | Oil Operator | Jan 2014 |
| 443 | Henson Doyle | Okmulgee, OK 74447-4841 | Oil & Gas Operator | Jun 2020 |
| 444 | Henson Terry Dba Daycon Exploration | Tulsa, OK 74137-3546 | Oil & Gas Operator | May 2025 |
| 445 | Heuston Oil LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 446 | High Energy | Cushing, OK 74023 | Oil & Gas Operator | May 2025 |
| 447 | Hightower Energy LLC | Cushing, OK 74023-6370 | Oil & Gas Operator | Jun 2025 |
| 448 | Hightower Oil & Gas | Cairo, IL 62914-0401 | Oil Operator | Nov 2014 |
| 449 | Hill Gilford | Stroud, OK 74079-9401 | Oil & Gas Operator | May 2013 |
| 450 | Hill William H | Broken Arrow, OK 74012-8952 | Oil & Gas Operator | Apr 2020 |
| 451 | Hinson Bobbie L | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 452 | Hinson Jr Bobbie L | Bristow, OK 74010 | Oil & Gas Operator | Jul 2020 |
| 453 | HLH Realty Co | Drumright, OK 74030 | Oil & Gas Operator | Mar 2016 |
| 454 | Holloway David A | Okmulgee, OK 74447-9191 | Oil & Gas Operator | May 2025 |
| 455 | Holman Kendall | Paden, OK 74860-7116 | Oil & Gas Operator | Jun 2025 |
| 456 | Holmes Mary Ellen | Bristow, OK 74010 | Oil Operator | Mar 2015 |
| 457 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 458 | Hope Oil Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2021 |
| 459 | Hoppes Helen E | Depew, OK 74028-3428 | Oil & Gas Operator | Apr 2015 |
| 460 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 461 | Horn Eddie L Dba B & E Investments | Bristow, OK 74010 | Oil & Gas Operator | May 2025 |
| 462 | Horn Oil Company | Bristow, OK 74010 | Oil & Gas Operator | May 2025 |
| 463 | Houseco Petroleum Inc | Bristow, OK 74010-0842 | Oil & Gas Operator | Aug 2002 |
| 464 | Hoyt Oil & Gas LLC | Cushing, OK 74023-0442 | Oil & Gas Operator | Apr 2025 |
| 465 | HRC Production Co | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 466 | Huitt Joe A | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 467 | Huitt Joe A Rev Trust | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2009 |
| 468 | Hull Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2021 |
| 469 | Hunt Brothers Producing Co Inc | Redding, CA 96049-2516 | Oil & Gas Operator | Sep 2012 |
| 470 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2025 |
| 471 | Hydrocarbon Technology Services | | Oil & Gas Operator | Dec 2000 |
| 472 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 473 | Imperial Petroleum Inc | Evansville, IN 47725 | Oil & Gas Operator | Jan 2005 |
| 474 | Indian Nation Energy Company | Wewoka, OK 74884-3456 | Oil & Gas Operator | Apr 2020 |
| 475 | Indian Wells Oil Co | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2000 |
| 476 | Indrex Inc | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2000 |
| 477 | Ingram Exploration Inc | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 478 | Inland Oil Corporation | Sapulpa, OK 74066 | Oil & Gas Operator | Jun 2025 |
| 479 | Intergy Production LLC | Edmond, OK 73083 | Oil & Gas Operator | Jun 2025 |
| 480 | International Energy Company LLC | Tulsa, OK 74136-3922 | Oil & Gas Operator | May 2025 |
| 481 | International Energy Corporation | Tulsa, OK 74136-3922 | Oil & Gas Operator | Dec 2018 |
| 482 | Interstate Operating LLC | Tulsa, OK 74101-0535 | Oil & Gas Operator | Aug 2013 |
| 483 | Iron Post Oil & Gas Co Inc | Bristow, OK 74010-4120 | Oil & Gas Operator | May 2025 |
| 484 | J & F Oil & Gas Company | Yale, OK 74085-0311 | Oil & Gas Operator | Feb 2004 |
| 485 | J & J Jackson Oil & Gas Inc | Centerview, MO 64019 | Oil Operator | Jun 2025 |
| 486 | J & J Production Company LLC | Okemah, OK 74859 | Oil & Gas Operator | Jun 2025 |
| 487 | J & M Oil Co | Overland PK, KS 66209 | Oil & Gas Operator | Apr 2025 |
| 488 | J & M Well Service & Trucking Inc | Bristow, OK 74010-2399 | Oil & Gas Operator | Apr 2025 |
| 489 | J & T Operating Inc | Norman, OK 73070-1736 | Oil & Gas Operator | Feb 2012 |
| 490 | J & T Resources Inc | Oologah, OK 74053-0249 | Oil Operator | Aug 2013 |
| 491 | J A Marrs Oil Company Inc | Drumright, OK 74030 | Oil & Gas Operator | Aug 2024 |
| 492 | J D Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2005 |
| 493 | J I Staley Co LLC | Okmulgee, OK 74447 | Oil & Gas Operator | Apr 2025 |
| 494 | J T Oil & Gas LLC | Sapulpa, OK 74066-9718 | Oil Operator | Nov 2024 |
| 495 | J.D. Pittman Operating LLC | Edmond, OK 73025 | Oil & Gas Operator | May 2025 |
| 496 | J.R. Oil Company | Houston, TX 77007 | Oil & Gas Operator | Jul 2019 |
| 497 | J/A Productions LLC | Kellyville, OK 74039-0544 | Oil Operator | May 2025 |
| 498 | Jac-Mac Energy Corporation | Oklahoma City, OK 73170 | Oil & Gas Operator | Jun 2025 |
| 499 | Jackson L B Production Co | Tulsa, OK 74193-0001 | Oil & Gas Operator | Aug 2013 |
| 500 | Jacobs Jean | Hurdle Mills, NC 27541 | Oil & Gas Operator | May 2013 |