| 12401 | H & D Exploration LLC | Hoisington, KS 67544 | Oil & Gas Operator | Dec 2024 |
| 12402 | H & D Operating Company | Refugio, TX 78377 | Oil & Gas Operator | May 2015 |
| 12403 | H & H & S Oil Producers | | Oil Operator | Jan 2025 |
| 12404 | H & H Compressors, Inc. | | Oil & Gas Operator | Oct 1997 |
| 12405 | H & H Drilling Company | Davis, OK 73030-2703 | Oil & Gas Operator | May 2014 |
| 12406 | H & H Energy Inc | Tuttle, OK 73089 | Oil Operator | May 2001 |
| 12407 | H & H Energy Of Ohio LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2024 |
| 12408 | H & H Exploration | Tulsa, OK 74132 | Oil & Gas Operator | Jan 2006 |
| 12409 | H & H Oil Co. | | Oil & Gas Operator | Dec 2024 |
| 12410 | H & H Oil Co. #1 | | Oil Operator | Jan 2025 |
| 12411 | H & H Oil Compan | | Oil & Gas Operator | Aug 1995 |
| 12412 | H & H Oil Company, A General Partnership | Plainville, KS 67663 | Oil Operator | Feb 1997 |
| 12413 | H & H Oil Producers | | Oil & Gas Operator | Jan 2025 |
| 12414 | H & H Oil Productions | Tulsa, OK 74145 | Oil Operator | Jul 1999 |
| 12415 | H & H Oil, LLC | Lincolnville, KS 66858 | Oil Operator | Dec 2024 |
| 12416 | H & H Operating | Olney, TX 76374 | Oil & Gas Operator | Apr 2025 |
| 12417 | H & H Petroleum, LLC | San Antonio, TX 78213 | Oil Operator | Apr 2025 |
| 12418 | H & H Production | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 12419 | H & H Production Company | Muenster, TX 76252 | Oil & Gas Operator | Oct 2005 |
| 12420 | H & H Production, Inc. | Topeka, KS 66614 | Oil Operator | May 1997 |
| 12421 | H & H Star Energy Inc | Traverse City, MI 49684 | Oil & Gas Operator | Aug 2016 |
| 12422 | H & H Supply Inc | | Gas Operator | Mar 1985 |
| 12423 | H & K Energy Corp | Columbus, OH 43229 | Oil & Gas Operator | Dec 1991 |
| 12424 | H & K Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |
| 12425 | H & K Oil Company (A) | Luling, TX 78648 | Oil Operator | Apr 2025 |
| 12426 | H & L Disposal Wells Inc | Beaver, OK 73932-1195 | Oil Operator | Dec 2012 |
| 12427 | H & L Exploration Company, LLC | Amarillo, TX 79114 | Oil & Gas Operator | Apr 2025 |
| 12428 | H & L Gas Co. | Sunray, TX 79086 | Gas Operator | Apr 2018 |
| 12429 | H & L Operating Co LLP | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 12430 | H & L Operating Co., LLC | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2021 |
| 12431 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 12432 | H & L Operators | | Oil & Gas Operator | Dec 2002 |
| 12433 | H & L Oprerating Company LLP | Amarillo, TX 79114 | Oil & Gas Operator | Nov 2019 |
| 12434 | H & M Oil Producers | Littleton, CO 80160 | Oil & Gas Operator | Apr 2000 |
| 12435 | H & M Packers Serv. L.L.C. | | Oil Operator | Dec 2019 |
| 12436 | H & M Petroleum Corporation | Lincoln, NE 68516 | Oil & Gas Operator | Jan 2025 |
| 12437 | H & M Productions L.L.C. | Overland Park, KS 66210 | Oil Operator | May 1998 |
| 12438 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 12439 | H & O Oil Co. | | Oil & Gas Operator | Dec 1989 |
| 12440 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 12441 | H & P Exploration Co. | Alice, TX 78333 | Oil & Gas Operator | May 2019 |
| 12442 | H & P Partnership | La Vernia, TX 78121 | Oil Operator | Apr 2025 |
| 12443 | H & R Exploratio | | Oil Operator | Feb 1992 |
| 12444 | H & R Exploration & Production, Inc. | Sidney, NE 69162 | Oil Operator | May 2007 |
| 12445 | H & R Oil Company | | Oil & Gas Operator | Dec 2000 |
| 12446 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 12447 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 12448 | H & S Investments LLC | Fairview, PA 16415-1807 | Oil & Gas Operator | Dec 2024 |
| 12449 | H & S Oil Co., LLC | Cherryvale, KS 67335 | Oil Operator | Oct 2024 |
| 12450 | H & S Oil Company | Kellyville, OK 74039 | Oil & Gas Operator | Mar 1998 |
| 12451 | H & S Oil LLC | Roswell, NM 882022387 | Oil & Gas Operator | Jul 2013 |
| 12452 | H & S Operating Co., Inc. | Winesburg, OH 44690 | Oil & Gas Operator | Dec 2024 |
| 12453 | H & S Production | Farmington, NM 87401 | Oil Operator | Dec 2007 |
| 12454 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 12455 | H & T Brock Oil Company LLC | Comanche, OK 73529-7140 | Oil & Gas Operator | Feb 2024 |
| 12456 | H & T Disposal | Abilene, TX 79608 | Oil Operator | Apr 2003 |
| 12457 | H & T Exploration, Inc. | Longview, TX 75605 | Oil & Gas Operator | Apr 2025 |
| 12458 | H & T Oil & Gas Company, Inc. | Alice, TX 78333 | Oil & Gas Operator | Mar 2008 |
| 12459 | H & W Drilling Inc | Racine, OH 45769 | Oil & Gas Operator | Dec 2023 |
| 12460 | H & W Energy | Youngstown, OH 44512 | Oil & Gas Operator | Dec 2015 |
| 12461 | H & W Marketing Company | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2002 |
| 12462 | H & W Oil | Electra, TX 76360 | Oil & Gas Operator | Mar 2008 |
| 12463 | H & W Oil Company, Incorporated | Palm Desert, CA 92255 | Oil Operator | Nov 2017 |
| 12464 | H & W Oil Corpor | | Oil Operator | Dec 1996 |
| 12465 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Apr 2025 |
| 12466 | H A L Petroleum | | Oil Operator | Oct 1987 |
| 12467 | H A Oil & Gas Company | Laverne, OK 73848-0100 | Gas Operator | Mar 2002 |
| 12468 | H And H | Gonzales, TX 78629 | Oil Operator | Feb 1999 |
| 12469 | H And H Star Energy Inc Dba Petrostar Energy | | Oil & Gas Operator | Feb 2004 |
| 12470 | H And K Resources Inc | | Oil Operator | Dec 2012 |
| 12471 | H B Oil & Gas Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Jun 2000 |
| 12472 | H C M Energy LLC | Billings, MT 59102 | Oil Operator | Jul 2003 |
| 12473 | H D Oil Company | Thermopolis, WY 82443 | Oil Operator | Mar 2025 |
| 12474 | H E C H Corporation | Ada, OK 74820-9528 | Oil Operator | Sep 2019 |
| 12475 | H E C I Exploration Company | | Oil & Gas Operator | Dec 1990 |
| 12476 | H F Production Co., LTD. | Wichita Falls, TX 76309 | Oil Operator | Feb 2020 |
| 12477 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 12478 | H G H Oil Company | | Oil Operator | Dec 1990 |
| 12479 | H H Exploration, Inc. | Incline VLLG, NV 89451 | Gas Operator | Feb 2018 |
| 12480 | H H H Oil Company | | Oil Operator | Jan 2025 |
| 12481 | H I Smith Oil & Gas Inc | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2024 |
| 12482 | H K A Enterprises Inc | Kettle, KY 42717 | Oil Operator | Dec 2021 |
| 12483 | H K Keesee And C J Keesee Trust | Farmington, NM 87499 | Gas Operator | Feb 2025 |
| 12484 | H L Altier Service Co Inc | Canton, OH 44718-3752-3752 | Oil & Gas Operator | Dec 2013 |
| 12485 | H L Brown Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2025 |
| 12486 | H L L Inc | Scottsdale, AZ 85251 | Oil & Gas Operator | Jan 2007 |
| 12487 | H M Jarred & Walsh-Watts | | Oil & Gas Operator | Sep 1992 |
| 12488 | H M Xploration Inc | Oklahoma City, OK 73116-7785 | Oil & Gas Operator | Feb 2012 |
| 12489 | H Oil Company, Inc. | Edna, TX 77957 | Oil & Gas Operator | Mar 2005 |
| 12490 | H P S Investments | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 12491 | H R Collier Collier Oil & Gas | | Oil & Gas Operator | Jan 2025 |
| 12492 | H R E Rental Company | Premont, TX 78375 | Oil & Gas Operator | Sep 2015 |
| 12493 | H R F Antrim LP | | Gas Operator | Jan 2025 |
| 12494 | H&G Petroleum Corporation | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 12495 | H&K Energy | Stockdale, TX 78160 | Oil & Gas Operator | Jul 2005 |
| 12496 | H&M Production, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Aug 2012 |
| 12497 | H&P Oil & Gas LLC | Mertzon, TX 76941 | Oil & Gas Operator | Apr 2025 |
| 12498 | H&P Operating | Megargel, TX 76370 | Oil & Gas Operator | Jan 2015 |
| 12499 | H&S Production, LLC | | Oil Operator | Nov 2024 |
| 12500 | H-30 Incorporate | | Oil & Gas Operator | Nov 1990 |