| 501 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 502 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 503 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 504 | Greenville Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Oct 1996 |
| 505 | Greenwood Holdings Inc | Englewood, CO BADADDR | Oil & Gas Operator | Jul 1995 |
| 506 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Sep 2025 |
| 507 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 508 | Grover-McKinney Oil Company | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 509 | Guadalupe Operating LLP | Midland, TX 79701 | Oil & Gas Operator | Oct 2013 |
| 510 | Guardian Operating Corp. | Midland, TX 79707 | Oil & Gas Operator | Nov 2016 |
| 511 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Aug 2025 |
| 512 | Gurley Oil Co | Kirtland, NM 87417 | Oil Operator | Dec 1995 |
| 513 | Guys Oil & Gas LTD Co | Hobbs, NM 88241 | Oil & Gas Operator | Dec 2019 |
| 514 | GVC Ventures | Mineola, TX 75773 | Oil & Gas Operator | Aug 2025 |
| 515 | H & S Oil LLC | Roswell, NM 882022387 | Oil & Gas Operator | Jul 2013 |
| 516 | H & S Production | Farmington, NM 87401 | Oil Operator | Dec 2007 |
| 517 | H K Keesee And C J Keesee Trust | Farmington, NM 87499 | Gas Operator | Jul 2025 |
| 518 | H L Brown Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 519 | H. L. Brown, Jr. | Midland, TX 79702 | Oil & Gas Operator | May 2001 |
| 520 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Jul 2025 |
| 521 | Haile Petroleum LTD | Artesia, NM 882110186 | Oil & Gas Operator | Aug 2000 |
| 522 | Hal J Rasmussen Oper Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2014 |
| 523 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jun 2025 |
| 524 | Hall Energy Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2016 |
| 525 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 526 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 527 | Hanagan Petroleum Corp | Roswell, NM 88201 | Oil & Gas Operator | Sep 1999 |
| 528 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 529 | Hanson Energy | Glencoe, NM 88324 | Oil & Gas Operator | Jul 2008 |
| 530 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Jun 2025 |
| 531 | Harken Southwest Corp | Dallas, TX 752612007 | Oil & Gas Operator | Feb 2001 |
| 532 | Harkey Energy Inc. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2020 |
| 533 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 534 | Harlow Enterprises LLC | Artesia, NM 88210 | Oil & Gas Operator | Jul 2025 |
| 535 | Harris & Walton | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 536 | Hart Oil & Gas Inc | Houston, TX 77024 | Oil & Gas Operator | Jan 2017 |
| 537 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Sep 2025 |
| 538 | Harvest Energy Company | Englewood, CO 80110 | Oil & Gas Operator | Jun 1997 |
| 539 | Harvest Petroleum Partners, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 540 | Harvey E Yates Company | Roswell, NM 88202 | Oil & Gas Operator | Feb 2015 |
| 541 | Havenor Operating Co | Roswell, NM 88201 | Oil & Gas Operator | Jun 2018 |
| 542 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 543 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 544 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 545 | Helemrich & Payne Inc | Iraan, TX 79744 | Oil & Gas Operator | Sep 2002 |
| 546 | Henry Petroleum LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2008 |
| 547 | Heritage Resources, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Feb 2014 |
| 548 | Heritage Standard Corporation | Dallas, TX 75206 | Oil & Gas Operator | Sep 2025 |
| 549 | Herman J Ledbetter | Abilene, TX 79606 | Oil & Gas Operator | Jul 1999 |
| 550 | Herman L Loeb | Lawrenceville, IL 62439 | Oil & Gas Operator | Jul 2009 |
| 551 | Herman L. Loeb, LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | May 2025 |
| 552 | Herman V Wallis | Kerrville, TX 780281858 | Gas Operator | Feb 2003 |
| 553 | Hess Co2 Resources LLC | Seminole, TX 79360 | Gas Operator | Aug 2017 |
| 554 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 555 | Hexp Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Sep 2025 |
| 556 | Hi - Mountain Energy Corporation | Odessa, TX 79762 | Oil & Gas Operator | Sep 2025 |
| 557 | Hicks Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Oct 2012 |
| 558 | High Plains Petroleum Corp | Boulder, CO 80305 | Oil & Gas Operator | Jan 2021 |
| 559 | High River Resources Operating LLC | Farmington, NM 87401 | Oil & Gas Operator | Jul 2025 |
| 560 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Sep 2025 |
| 561 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 562 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 563 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 564 | Holcomb Oil & Gas Inc | Farmington, NM 87401 | Oil & Gas Operator | Jul 2025 |
| 565 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 566 | Hondo Drilling Company | Midland, TX 79702 | Oil & Gas Operator | Nov 1996 |
| 567 | Hope Oil Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2021 |
| 568 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 569 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 570 | Horseshoe Operating Inc | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 571 | Hpoc, LLC | Cuba, NM 87013 | Oil Operator | Mar 2025 |
| 572 | HPPC, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2023 |
| 573 | HRC Inc | Hobbs, NM 88241 | Gas Operator | Jun 2017 |
| 574 | HS Resources | Tulsa, OK 74136 | Oil & Gas Operator | Aug 1997 |
| 575 | Hudson Oil Company Of Texas | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 576 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 577 | Hunt Cimarron Limited Partnership | Roswell, NM 88202 | Oil & Gas Operator | Jul 2025 |
| 578 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2025 |
| 579 | Hunt Petroleum, Inc. | Houston, TX 772511350 | Oil & Gas Operator | Nov 2002 |
| 580 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2025 |
| 581 | Iacx Production LLC | Roswell, NM 88201 | Oil & Gas Operator | Jul 2025 |
| 582 | Ica Energy Operating, L.L.C. | Odessa, TX 79760 | Oil & Gas Operator | Sep 2025 |
| 583 | Imperial Operating Co., L.L.C. | Midland, TX 79701 | Oil Operator | Sep 2023 |
| 584 | Imperial Petroleum Inc | Evansville, IN 47725 | Oil & Gas Operator | Jan 2005 |
| 585 | Impetro Oil & Gas, LLC | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2018 |
| 586 | Impetro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2020 |
| 587 | Incline Reserves Inc | Topeka, KS BAD ADDR | Oil & Gas Operator | Mar 1994 |
| 588 | Inflow Petroleum Resources LP | Dallas, TX 75240 | Oil & Gas Operator | Sep 2008 |
| 589 | Intercoast Oil And Gas | Tulsa, OK 74136 | Oil & Gas Operator | Mar 1997 |
| 590 | Intrepid Operating LTD., Co | Hobbs, NM 88241 | Oil & Gas Operator | Nov 2009 |
| 591 | Invito Operating, LLC | McKinney, TX 75070 | Oil & Gas Operator | Jul 2025 |
| 592 | J & G Enterprise LTD., Co. | Artesia, NM 88211 | Oil & Gas Operator | Nov 1997 |
| 593 | J & J Investments, LLC | Loco Hills, NM 88255 | Oil & Gas Operator | Jul 2025 |
| 594 | J & J Service Inc | Lovington, NM 88260 | Oil & Gas Operator | Jul 2025 |
| 595 | J C Fisher | Salt Lake City, UT 84117 | Oil & Gas Operator | Feb 2008 |
| 596 | J C Well Service | Farmington, NM 87499 | Oil Operator | Jun 2003 |
| 597 | J C Williamson | Midland, TX 79702 | Oil & Gas Operator | May 2013 |
| 598 | J Cleo Thompson | Odessa, TX 79764 | Oil & Gas Operator | Jul 2017 |
| 599 | J D R LTD | Artesia, NM 88210 | Oil Operator | Aug 2009 |
| 600 | J F McAdams | Hobbs, NM 88240 | Oil Operator | Dec 2011 |