| 13401 | High Plains Production, LLC | Murray, KY 42071 | Oil & Gas Operator | Dec 2024 |
| 13402 | High Point Produ | | Gas Operator | May 1996 |
| 13403 | High River Res Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 13404 | High River Resources Operating LLC | Farmington, NM 87401 | Oil & Gas Operator | Jan 2025 |
| 13405 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 13406 | High Sierra Operating, LTD. | Canyon Lake, TX 78133 | Oil & Gas Operator | Mar 2008 |
| 13407 | High Sierra Water Services Mid Continent LLC | Denver, CO 80209 | Oil Operator | Feb 2010 |
| 13408 | High Sky Oil & Gas | Midland, TX 79705 | Oil & Gas Operator | Jun 2008 |
| 13409 | High Sky Partners LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2015 |
| 13410 | High Splint Gas & Oil, Inc | Greenville, KY 42345 | Oil Operator | Dec 2023 |
| 13411 | High Summit Oil & Gas Inc | | Oil & Gas Operator | Sep 1987 |
| 13412 | High-Hope Oil And Gas, Inc | | Oil & Gas Operator | Mar 2017 |
| 13413 | High-Line Production Services LLC | | Oil & Gas Operator | Nov 2024 |
| 13414 | Higher Standard Oil Company,Inc. | Frisco, TX 75034 | Oil Operator | Apr 2025 |
| 13415 | Highfill Bob W | Claremore, OK 74018-2595 | Oil Operator | Jun 2005 |
| 13416 | Highground, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Apr 2025 |
| 13417 | Highhouse James R | Warren, PA 16365-7550 | Oil & Gas Operator | Dec 2008 |
| 13418 | Highland Energy Co | Dallas, TX 75201 | Oil & Gas Operator | Jun 1994 |
| 13419 | Highland Exploration | | Oil Operator | Sep 1979 |
| 13420 | Highland Minerals, Inc. | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 13421 | Highland Oil & Gas Co | Mason, OH 45040 | Oil Operator | Dec 2022 |
| 13422 | Highland Oil & Gas LLC | Houston, TX 77079-7220 | Oil & Gas Operator | Feb 2015 |
| 13423 | Highland Oil Co. | | Oil Operator | Mar 1953 |
| 13424 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 13425 | Highland Resources, Inc. | | Oil & Gas Operator | Dec 2004 |
| 13426 | Highlander Oil & Gas Assets LLC | | Gas Operator | Jan 2025 |
| 13427 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 13428 | Highline Exploration, Inc. | Tuscaloosa, AL 35402 | Gas Operator | Nov 2020 |
| 13429 | Highman Oil & Gas LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2023 |
| 13430 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Apr 2025 |
| 13431 | Highmount Black Warrior Basin, LLC | | Gas Operator | Jul 2010 |
| 13432 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 13433 | Highmount Midwest Energy LLC | | Oil & Gas Operator | Sep 2011 |
| 13434 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |
| 13435 | Highpeak Energy Holdings, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 13436 | Highpoint Energy LLC | | Oil & Gas Operator | Nov 2022 |
| 13437 | Highpointe Oil & Gas LLC | Indiana, PA 15701-8944 | Gas Operator | Dec 2024 |
| 13438 | Hightower Energy LLC | Cushing, OK 74023-6370 | Oil & Gas Operator | Feb 2025 |
| 13439 | Hightower Exploration | Kilgore, TX 75662 | Oil & Gas Operator | Apr 2025 |
| 13440 | Hightower Oil & Gas | Cairo, IL 62914-0401 | Oil Operator | Nov 2014 |
| 13441 | Highway 15 SWD LLC | Shattuck, OK 73858 | Oil Operator | Oct 2021 |
| 13442 | Highway 60 SWD LLC | Shattuck, OK 73858-0848 | Oil Operator | Jul 2019 |
| 13443 | Hikcott Oil | Wilson, OK 73463-6537 | Oil Operator | Jan 2014 |
| 13444 | Hiko Bell Mining & Oil Co | Vernal, UT 84078 | Oil & Gas Operator | Oct 2003 |
| 13445 | Hiland Energy LP | Enid, OK 73701-0032 | Oil & Gas Operator | Dec 2022 |
| 13446 | Hilbers Oil & Gas | Archer City, TX 76351 | Oil & Gas Operator | Oct 2002 |
| 13447 | Hilburn Ind., Inc. | | Oil Operator | Jan 1978 |
| 13448 | Hilcorp Alaska, LLC | | Oil & Gas Operator | Feb 2025 |
| 13449 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Apr 2025 |
| 13450 | Hilcorp North Slope, LLC | | Oil & Gas Operator | Feb 2025 |
| 13451 | Hilden Oil Co Inc | | Oil & Gas Operator | Oct 2024 |
| 13452 | Hildreth, Roy G & Son Inc | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 13453 | Hildreth, Va Roy | | Oil & Gas Operator | Dec 1996 |
| 13454 | Hildreth, William H & David Dale | | Oil & Gas Operator | Dec 2021 |
| 13455 | Hill Drilling Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1997 |
| 13456 | Hill Gilford | Stroud, OK 74079-9401 | Oil & Gas Operator | May 2013 |
| 13457 | Hill John H | Dallas, TX 75240-7077 | Oil & Gas Operator | Jul 2015 |
| 13458 | Hill Oil And Gas Co., Inc. | Overland Park, KS 66213 | Oil Operator | Mar 2020 |
| 13459 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Jan 2025 |
| 13460 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 13461 | Hill Production | | Oil & Gas Operator | Nov 1981 |
| 13462 | Hill Production Co Inc-Wisconsin | Humble, TX 77347 | Oil & Gas Operator | Jun 1993 |
| 13463 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 13464 | Hill Production Company No. 2 | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 13465 | Hill Resources Inc | | Oil & Gas Operator | Nov 2022 |
| 13466 | Hill Robert H & Willa F | Morris, OK 74445 | Oil & Gas Operator | Apr 2020 |
| 13467 | Hill William F | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1993 |
| 13468 | Hill William H | Broken Arrow, OK 74012-8952 | Oil & Gas Operator | Apr 2020 |
| 13469 | Hill, A G | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 13470 | Hill, Albert, Trust | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 13471 | Hill, Bill | Kilgore, TX 75663 | Oil Operator | Mar 2014 |
| 13472 | Hill, Charles Drilling, Inc. | Grand Prairie, TX 75052 | Oil & Gas Operator | Apr 2025 |
| 13473 | Hill, Gillman A | Englewood, CO 80112 | Oil & Gas Operator | Jun 1993 |
| 13474 | Hill, Hub, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 1994 |
| 13475 | Hill, R.M. Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 13476 | Hill, T. R. | Graham, TX 76450 | Oil & Gas Operator | Apr 1995 |
| 13477 | Hill-Lake Gas Storage, L.P. | Houston, TX 77057 | Oil & Gas Operator | Aug 2010 |
| 13478 | Hill-Lake Gas Storage, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Apr 2025 |
| 13479 | Hillary Oil Comp | | Oil & Gas Operator | Apr 1991 |
| 13480 | Hillcrest Petroleum, LLC | Midland, TX 79707 | Oil & Gas Operator | Jun 2019 |
| 13481 | Hillenburg Oil C | | Oil Operator | Apr 1994 |
| 13482 | Hillenburg Oil Co., A General Partnership | Broken Arrow, OK 74011 | Oil Operator | Dec 2024 |
| 13483 | Hillenburg Oil Company | Broken Arrow, OK 74011-4021 | Oil Operator | Apr 2011 |
| 13484 | Hilliard Oil | Bronte, TX 76933 | Oil & Gas Operator | Mar 2008 |
| 13485 | Hilliard Oil & Gas Inc | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 13486 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 13487 | Hilligoss Leonard | | Oil Operator | Aug 2022 |
| 13488 | Hilliker Oil Com | | Oil Operator | Jul 1984 |
| 13489 | Hilliker Production | Indian Wells, CA 92210 | Oil & Gas Operator | Jul 2007 |
| 13490 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 13491 | Hillin Simon/Prime Expl., L.C. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 13492 | Hillin, T. A. | Kerrville, TX 78028 | Oil & Gas Operator | Aug 2020 |
| 13493 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 13494 | Hills Dozer Service | Stroud, OK 74079 | Oil & Gas Operator | Mar 2022 |
| 13495 | Hillshafer-Goodway Corp | | Oil & Gas Operator | Jun 1994 |
| 13496 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 13497 | Hillside Oil Inc | Aurora, ON L4G | Oil Operator | Dec 2021 |
| 13498 | Hillside Oil Partners | | Oil & Gas Operator | Dec 1999 |
| 13499 | Hillside Resources | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2007 |
| 13500 | Hilltex Operating Company, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2021 |