| 401 | Greenstone Energy, LLC | Houston, TX 77208 | Oil Operator | May 2025 |
| 402 | Greka Am Inc | Santa Maria, CA 93454 | Oil & Gas Operator | May 2013 |
| 403 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 404 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 405 | Grover-McKinney Oil Company | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 406 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 407 | GTG Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 408 | Gulf Central Petroleum Corp. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 409 | GW Energy, Inc. | Midland, TX 79710 | Oil Operator | May 2025 |
| 410 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 411 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 412 | H&M Production, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Aug 2012 |
| 413 | H. & L. Oil Company | Midland, TX 79707 | Oil & Gas Operator | Mar 2005 |
| 414 | Habanero Oil & Gas Operating,LLC | Austin, TX 78701 | Oil & Gas Operator | Feb 2018 |
| 415 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 416 | Hamm, Richard Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2025 |
| 417 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | May 2025 |
| 418 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 419 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 420 | Hanvey, Don H. Oil Interests Inc | Cisco, TX 76437 | Oil & Gas Operator | May 2025 |
| 421 | Harkey Energy Inc. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2020 |
| 422 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 423 | Haylan Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jan 2000 |
| 424 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 425 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 426 | Heifer Production Company LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 427 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2025 |
| 428 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 429 | Henry Resources LLC | Midland, TX 79703 | Oil & Gas Operator | May 2025 |
| 430 | Henson Exploration, L.P. | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 431 | Herricks Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Jan 2010 |
| 432 | Hewitt, Alan P. | Midland, TX 79702 | Oil & Gas Operator | Aug 1997 |
| 433 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | May 2025 |
| 434 | Hi - Mountain Energy Corporation | Odessa, TX 79762 | Oil & Gas Operator | May 2025 |
| 435 | Hicon Gas Producers, Inc. | New York, NY 10110 | Oil & Gas Operator | Oct 1999 |
| 436 | High Mountain Oil & Gas | Hobbs, NM 88240 | Oil & Gas Operator | Jan 2019 |
| 437 | High Mountain Oil & Gas, LLC | Hobbs, NM 88240 | Oil & Gas Operator | May 2025 |
| 438 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 439 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2025 |
| 440 | Hill, A G | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 441 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 442 | Hillin Simon/Prime Expl., L.C. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 443 | Hillin, T. A. | Kerrville, TX 78028 | Oil & Gas Operator | Aug 2020 |
| 444 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 445 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 446 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 447 | HMH Operators, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 448 | Holly Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2008 |
| 449 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 450 | Horizon Ridge Oil Company | Austin, TX 78738 | Oil Operator | May 2025 |
| 451 | Houghton Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2009 |
| 452 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 453 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2025 |
| 454 | Hudson, Comer Oil & Gas | Cisco, TX 76437 | Oil & Gas Operator | Jan 2003 |
| 455 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 456 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 457 | Hunt, Hassie Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 458 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2025 |
| 459 | Hybrid Operating, Incorporated | Carlsbad, CA 92009 | Oil & Gas Operator | May 2025 |
| 460 | Hydrogeo Energy, LLC | Houston, TX 77074 | Oil Operator | May 2025 |
| 461 | Hydrogeo, L.L.C. | Houston, TX 77074 | Oil & Gas Operator | May 2025 |
| 462 | Ibex Resources I, L.P. | Midland, TX 79701 | Oil & Gas Operator | Jul 1999 |
| 463 | Ibex Resources Operating LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2007 |
| 464 | Ibex Resources, LLC | Austin, TX 78751 | Oil & Gas Operator | Jul 1999 |
| 465 | Ica Energy Operating, L.L.C. | Odessa, TX 79760 | Oil & Gas Operator | May 2025 |
| 466 | Ice Brothers, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jul 2024 |
| 467 | Imperial Gas Resources LLC | Austin, TX 78701 | Oil & Gas Operator | May 2025 |
| 468 | Imperial Operating Co., L.L.C. | Midland, TX 79701 | Oil Operator | Sep 2023 |
| 469 | Incline Energy | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 470 | Ipt Oil Company | Evansville, IN 47706 | Oil & Gas Operator | May 2025 |
| 471 | Iskandia Energy Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 472 | J Oil & Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2016 |
| 473 | J Rico Oil, LLC | Henderson, NV 89074 | Oil & Gas Operator | May 2025 |
| 474 | J-E Production, Inc. | Midland, TX 79708 | Oil & Gas Operator | Mar 2008 |
| 475 | J-Tec Operating, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2025 |
| 476 | J. C. Oil Company | Odessa, TX 79766 | Oil & Gas Operator | Mar 2015 |
| 477 | J.T. Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Sep 2018 |
| 478 | Jagged Peak Energy LLC | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2025 |
| 479 | Jay Management Company LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 480 | JC Enterprises | Andrews, TX 79714 | Oil & Gas Operator | Jun 2012 |
| 481 | JCR, Jr - Operating, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Apr 2022 |
| 482 | Jeter Drilling Production | Del Rio, TX 78840 | Oil & Gas Operator | May 2025 |
| 483 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 484 | Jilpetco, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | May 2025 |
| 485 | Jin Petroleum LLC | New Braunfels, TX 78130 | Oil Operator | May 2025 |
| 486 | JJB Operating Co. | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2025 |
| 487 | JM Cox Resources LP | Midland, TX 79702 | Oil & Gas Operator | Apr 2019 |
| 488 | Johnson & Ernst Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2018 |
| 489 | Johnson & Lindley, Inc. | Houston, TX 77227 | Oil & Gas Operator | May 2013 |
| 490 | Johnson And Price | Midland, TX 79702 | Oil & Gas Operator | Dec 1995 |
| 491 | Jones, Johnny G. | Midland, TX 79708 | Oil & Gas Operator | Feb 2000 |
| 492 | Jones, L. E. Operating, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2025 |
| 493 | JTL Oil Company LLC | Wichita Falls, TX 76305 | Oil & Gas Operator | May 2025 |
| 494 | JTL Operating Co Inc | Katy, TX 77450 | Oil & Gas Operator | May 2025 |
| 495 | Julana Oil & Gas | MC Camey, TX 79752 | Oil & Gas Operator | May 2025 |
| 496 | Just Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 497 | Jva Operating Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2021 |
| 498 | K & E Drilling, Inc | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 499 | K & E Oil & Gas Co. | Bayfield, CO 81122 | Oil & Gas Operator | Oct 2008 |
| 500 | K & E Petroleum, Inc. | San Antonio, TX 78230 | Oil & Gas Operator | Apr 2012 |