| 2501 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 2502 | Harbeston, James N | | Oil Operator | Jan 2026 |
| 2503 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2026 |
| 2504 | Hard Rock Operating LLC | | Oil & Gas Operator | May 2022 |
| 2505 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 2506 | Hardin Productions | Okemah, OK 74859 | Oil & Gas Operator | Dec 2006 |
| 2507 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Jan 2026 |
| 2508 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Jan 2026 |
| 2509 | Harding Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2016 |
| 2510 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 2511 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 2512 | Hargus Curtis | Macomb, OK 74852-8508 | Oil Operator | May 2017 |
| 2513 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 2514 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 2515 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 2516 | Harold G Raper Family Trust | Mansfield, TX 76063-1667 | Oil Operator | May 2023 |
| 2517 | Harold M Root Foundation | | Oil Operator | Feb 2026 |
| 2518 | Harp Peggy A | Seminole, OK 74868-2284 | Oil & Gas Operator | Mar 2024 |
| 2519 | Harper Joe Howard Dba J H Field Service | Nowata, OK 74048-9704 | Oil & Gas Operator | Dec 2025 |
| 2520 | Harrell Petroleum Inc | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Oct 2017 |
| 2521 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 2522 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 2523 | Harrington Orville | Dewey, OK 74029 | Oil Operator | Feb 2026 |
| 2524 | Harrington SR Tommy W | Drumright, OK 74030-5778 | Oil Operator | May 2015 |
| 2525 | Harris B D | Norman, OK 73071-4802 | Oil & Gas Operator | Apr 2014 |
| 2526 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Feb 2026 |
| 2527 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Feb 2026 |
| 2528 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 2529 | Harris Olin | Okmulgee, OK 74447-8508 | Oil Operator | Feb 2012 |
| 2530 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Dec 2025 |
| 2531 | Harrison-Wright Oil Company LLC | Tulsa, OK 74133-7035 | Oil & Gas Operator | Feb 2026 |
| 2532 | Harrod Leasing | Edmond, OK 73034 | Oil & Gas Operator | Jan 2026 |
| 2533 | Hart David | Chickasha, OK 73018-7756 | Oil & Gas Operator | Mar 2015 |
| 2534 | Harter Energy Inc | Tulsa, OK 74105 | Oil & Gas Operator | Dec 2025 |
| 2535 | Hartline Tom | Drumright, OK 74030 | Oil Operator | Nov 2025 |
| 2536 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jan 2026 |
| 2537 | Harvey A B | Seminole, OK 74868-1724 | Oil Operator | Mar 2015 |
| 2538 | Harwood Oil & Gas Inc | Greeley, CO 80631-8233 | Oil & Gas Operator | Jan 2026 |
| 2539 | Hat-Top Production Co | Duncan, OK 73533 | Oil Operator | Apr 2011 |
| 2540 | Hatley Delbert Jr Dba DH Enterprises | Oklahoma City, OK 73129 | Oil & Gas Operator | Feb 2026 |
| 2541 | Haught Harold | Hominy, OK 74035 | Oil Operator | Feb 2012 |
| 2542 | Hawkins & Hawkins | Council Hill, OK 74428 | Oil & Gas Operator | Jul 1996 |
| 2543 | Hawkins & Son Inc | Boynton, OK 74422 | Oil & Gas Operator | Aug 2019 |
| 2544 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 2545 | Hawthorne Carl A | Mounds, OK 74047-4936 | Oil & Gas Operator | Apr 2015 |
| 2546 | Haydens Oil And Gas LLC | Dover, OK 73734 | Oil & Gas Operator | Jan 2026 |
| 2547 | Hayes & Hudson | Bartlesville, OK 74003 | Oil & Gas Operator | Feb 2026 |
| 2548 | Haynes Jim L & Betty L | Haskell, OK 74436-8803 | Oil & Gas Operator | Dec 2013 |
| 2549 | Hays Herb E & K S | Bartlesville, OK 74006 | Oil Operator | Feb 2026 |
| 2550 | Hays Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2000 |
| 2551 | Hays Production LLC | Velma, OK 73491 | Oil & Gas Operator | Dec 2025 |
| 2552 | Hays Stanley L | Wynola, OK 74084 | Oil Operator | May 2022 |
| 2553 | Hazelwood Louis J | Albuquerque, NM 87111-6870 | Oil & Gas Operator | Feb 2023 |
| 2554 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Jan 2026 |
| 2555 | Hazen Oil Company | Cleveland, OK 74020-9633 | Oil Operator | Jul 2020 |
| 2556 | Hazlewood Oil & Gas Co Inc | Oklahoma City, OK 73139-9353 | Oil & Gas Operator | Apr 2022 |
| 2557 | HB Oil Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2023 |
| 2558 | HCG Energy Corporation & Subs | | Oil & Gas Operator | Mar 2015 |
| 2559 | HCL Inc | Woodward, OK 73802-1074 | Oil Operator | Mar 2015 |
| 2560 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 2561 | Headington Energy Corporation | | Oil & Gas Operator | Aug 1992 |
| 2562 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 2563 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 2564 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
| 2565 | Heartland Exploration | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2000 |
| 2566 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 2567 | Heartland Pumping | Hennessey, OK 73742-7311 | Oil & Gas Operator | Feb 2026 |
| 2568 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 2569 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 2570 | Heath Jack A | Tulsa, OK 74132-2403 | Oil & Gas Operator | Jan 2013 |
| 2571 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Jan 2026 |
| 2572 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 2573 | Heights Energy Corporation | Plano, TX 75026 | Oil & Gas Operator | May 2026 |
| 2574 | Heinrich Production Co Inc | Lubbuck, TX 79424 | Oil Operator | Dec 2024 |
| 2575 | Hellard Elmer J | Sapulpa, OK 74066 | Oil & Gas Operator | Jan 2026 |
| 2576 | Heller Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | Feb 2026 |
| 2577 | Helmco LTD | Kiefer, OK 74041-0397 | Oil & Gas Operator | Jan 2007 |
| 2578 | Helmco Production Company | Pawhuska, OK 74056 | Oil Operator | Aug 2000 |
| 2579 | Helmer Oil Corporation | | Oil & Gas Operator | Feb 2026 |
| 2580 | Helmer, Bonnie J | | Oil Operator | Feb 2026 |
| 2581 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2026 |
| 2582 | Helton Oil Company | Edmond, OK 73083-7283 | Oil & Gas Operator | Aug 2016 |
| 2583 | Hembree Alva | Oklahoma City, OK 73151-9145 | Oil & Gas Operator | Jun 2016 |
| 2584 | Hembree Brit W | Shawnee, OK 74802-1725 | Oil & Gas Operator | Jan 2026 |
| 2585 | Hemstead Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2001 |
| 2586 | Henderson Don Inc | Oklahoma City, OK 73134-1753 | Oil & Gas Operator | Aug 2013 |
| 2587 | Henderson Exploration Company | Tulsa, OK 74120 | Oil & Gas Operator | May 2013 |
| 2588 | Henderson Fred J | Okmulgee, OK 74447 | Oil & Gas Operator | Jan 2026 |
| 2589 | Hendrickson Lester | Delaware, OK 74027-9715 | Oil Operator | Mar 2015 |
| 2590 | Hendrickson W R | Beggs, OK 74421-2936 | Oil & Gas Operator | Jun 2023 |
| 2591 | Henley, VIola F | | Oil Operator | Feb 2026 |
| 2592 | Hennessey Oil & Gas LLC | Hennessey, OK 73742-0212 | Oil & Gas Operator | Sep 2024 |
| 2593 | Henry Billy Or Connie | Okemah, OK 74859-6075 | Oil & Gas Operator | Jul 2021 |
| 2594 | Henry Gungoll Operating Inc | Enid, OK 73703 | Oil & Gas Operator | Feb 2026 |
| 2595 | Henry Oil & Gas Inc | Oklahoma City, OK 73127 | Oil & Gas Operator | Jul 2009 |
| 2596 | Henry Petroleum Inc | Oklahoma City, OK 73162-1757 | Oil & Gas Operator | Sep 2019 |
| 2597 | Henry Petroleum Of Oklahoma LP | Midland, TX 79703-5000 | Oil & Gas Operator | Feb 2017 |
| 2598 | Henry Rennick | | Oil Operator | Feb 2026 |
| 2599 | Henry Wat Oil Company | Tulsa, OK 74101 | Oil Operator | Jan 2014 |
| 2600 | Henson Doyle | Okmulgee, OK 74447-4841 | Oil & Gas Operator | Jun 2020 |