| 2501 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Mar 2026 |
| 2502 | H & S Oil Company | Kellyville, OK 74039 | Oil & Gas Operator | Mar 1998 |
| 2503 | H & T Brock Oil Company LLC | Comanche, OK 73529-7140 | Oil & Gas Operator | Feb 2024 |
| 2504 | H & W Drilling Inc | Racine, OH 45769 | Oil & Gas Operator | Dec 2023 |
| 2505 | H A Oil & Gas Company | Laverne, OK 73848-0100 | Gas Operator | Mar 2002 |
| 2506 | H B Oil & Gas Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Jun 2000 |
| 2507 | H E C H Corporation | Ada, OK 74820-9528 | Oil Operator | Sep 2019 |
| 2508 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 2509 | H L L Inc | Scottsdale, AZ 85251 | Oil & Gas Operator | Jan 2007 |
| 2510 | H R Collier Collier Oil & Gas | | Oil & Gas Operator | Dec 2025 |
| 2511 | H-Petro-R Inc | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 2512 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 2513 | H2ok LLC | Marble Falls, TX 78654 | Oil & Gas Operator | Jan 2026 |
| 2514 | H2ox Operating LLC | Tulsa, OK 74103 | Oil Operator | Jan 2026 |
| 2515 | Haas Petroleum LLC | Prairie VIllage, KS 66208 | Oil Operator | Sep 2025 |
| 2516 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Dec 2025 |
| 2517 | Hadaway Engineering Inc | Canadian, TX 79014 | Oil & Gas Operator | Jul 2015 |
| 2518 | Hadco LTD | Ardmore, OK 73401-6929 | Oil & Gas Operator | Mar 2015 |
| 2519 | Haddox Johnny C | Okemah, OK 74859-0254 | Oil Operator | Apr 2020 |
| 2520 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 2521 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 2522 | Hagler William N | Farmington, NM 87499-0035 | Oil Operator | Apr 2014 |
| 2523 | Hail Petroleum Corporation | Garland, TX 75047-5036 | Oil Operator | Mar 1997 |
| 2524 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 2525 | Haines Oil Company | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2009 |
| 2526 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Oct 2025 |
| 2527 | Halcyon Natural Gas LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2025 |
| 2528 | Hale John H | Tulsa, OK 74107 | Oil & Gas Operator | Mar 2000 |
| 2529 | Halfway Oil Inc | Tahlequah, OK 74464-5448 | Oil & Gas Operator | Aug 2013 |
| 2530 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 2531 | Hall And Kelley Oil & Gas | | Oil Operator | Dec 1995 |
| 2532 | Hall Edward L | Ada, OK 74820-3321 | Oil & Gas Operator | Dec 2025 |
| 2533 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 2534 | Hall Exploration, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 2535 | Hall Resources Corporation | Independence, MO 64057-2158 | Oil & Gas Operator | Jun 2016 |
| 2536 | Hallco Petroleum Inc | Oklahoma City, OK 73106-5224 | Oil Operator | Aug 2018 |
| 2537 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 2538 | Hallmark Resources, Inc | Stilwell, OK 74960-0312 | Oil & Gas Operator | Sep 2020 |
| 2539 | Hallum Construction Inc | Seminole, OK 74868-2427 | Oil & Gas Operator | Sep 2014 |
| 2540 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 2541 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 2542 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Dec 2025 |
| 2543 | Hamilton B J | Ada, OK 74820-9404 | Oil & Gas Operator | Sep 1999 |
| 2544 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 2545 | Hamilton K M Oil & Gas Co | Ada, OK 74820 | Oil Operator | Jan 2013 |
| 2546 | Hammer Oil Properties Inc | Enid, OK 73706-0144 | Oil & Gas Operator | Oct 2017 |
| 2547 | Hammer Ranch | Elmore City, OK 73433 | Oil & Gas Operator | Jan 2023 |
| 2548 | Hamon Jake L | Dallas, TX 75201-3902 | Oil & Gas Operator | Nov 1997 |
| 2549 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 2550 | Hamp Oil | Ponca City, OK 74604 | Oil & Gas Operator | Sep 2002 |
| 2551 | Hampton Corporation (The) | Norman, OK 73069-5910 | Oil Operator | Jun 2016 |
| 2552 | Hancock Leon | Kingston, OK 73439-9618 | Oil Operator | Dec 2014 |
| 2553 | Hanna Oil And Gas Company | Fort Smith, AR 72901 | Oil & Gas Operator | Dec 2025 |
| 2554 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2025 |
| 2555 | Hanover Operating Company | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1998 |
| 2556 | Hansen Noel | Avant, OK 74001 | Oil Operator | Aug 2013 |
| 2557 | Happy Hill Operating LLC | Guthrie, OK 73044-7361 | Oil & Gas Operator | Oct 2017 |
| 2558 | Har Ken Oil Company | | Oil & Gas Operator | Dec 2021 |
| 2559 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 2560 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 2026 |
| 2561 | Hard Rock Operating LLC | | Oil & Gas Operator | May 2022 |
| 2562 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 2563 | Hardin Productions | Okemah, OK 74859 | Oil & Gas Operator | Dec 2006 |
| 2564 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Dec 2025 |
| 2565 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Nov 2025 |
| 2566 | Harding Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2016 |
| 2567 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 2568 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 2569 | Hargus Curtis | Macomb, OK 74852-8508 | Oil Operator | May 2017 |
| 2570 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 2571 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 2572 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 2573 | Harmony Oil LLC | Cushing, OK 74023 | Oil Operator | Dec 2025 |
| 2574 | Harold Enterprises Inc | Kellyville, OK 74039-0441 | Oil & Gas Operator | Jan 2018 |
| 2575 | Harold G Raper Family Trust | Mansfield, TX 76063-1667 | Oil Operator | May 2023 |
| 2576 | Harold M Root Foundation | | Oil Operator | Dec 2025 |
| 2577 | Harp Peggy A | Seminole, OK 74868-2284 | Oil & Gas Operator | Mar 2024 |
| 2578 | Harper Joe Howard Dba J H Field Service | Nowata, OK 74048-9704 | Oil & Gas Operator | Dec 2025 |
| 2579 | Harrell Petroleum Inc | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Oct 2017 |
| 2580 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 2581 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 2582 | Harrington Orville | Dewey, OK 74029 | Oil Operator | Dec 2025 |
| 2583 | Harrington SR Tommy W | Drumright, OK 74030-5778 | Oil Operator | May 2015 |
| 2584 | Harris B D | Norman, OK 73071-4802 | Oil & Gas Operator | Apr 2014 |
| 2585 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Dec 2025 |
| 2586 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Dec 2025 |
| 2587 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 2588 | Harris Olin | Okmulgee, OK 74447-8508 | Oil Operator | Feb 2012 |
| 2589 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Dec 2025 |
| 2590 | Harrison-Wright Oil Company LLC | Tulsa, OK 74133-7035 | Oil & Gas Operator | Jan 2026 |
| 2591 | Harrod Leasing | Edmond, OK 73034 | Oil & Gas Operator | Dec 2025 |
| 2592 | Hart David | Chickasha, OK 73018-7756 | Oil & Gas Operator | Mar 2015 |
| 2593 | Harter Energy Inc | Tulsa, OK 74105 | Oil & Gas Operator | Dec 2025 |
| 2594 | Hartline Tom | Drumright, OK 74030 | Oil Operator | Nov 2025 |
| 2595 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 2596 | Harvey A B | Seminole, OK 74868-1724 | Oil Operator | Mar 2015 |
| 2597 | Harwood Oil & Gas Inc | Greeley, CO 80631-8233 | Oil & Gas Operator | Dec 2025 |
| 2598 | Hat-Top Production Co | Duncan, OK 73533 | Oil Operator | Apr 2011 |
| 2599 | Hatley Delbert Jr Dba DH Enterprises | Oklahoma City, OK 73129 | Oil & Gas Operator | Jan 2026 |
| 2600 | Haught Harold | Hominy, OK 74035 | Oil Operator | Feb 2012 |