| 1 | H & A Drilling | Newark, OH 43056 | Oil Operator | Dec 2024 |
| 2 | H & B Petroleum Corp. | Hutchinson, KS 67504 | Oil & Gas Operator | Sep 2025 |
| 3 | H & B Production | | Oil Operator | Mar 1995 |
| 4 | H & B Well Service, Inc. | | Oil & Gas Operator | Aug 1993 |
| 5 | H & C Oil Operat | | Oil & Gas Operator | Dec 1996 |
| 6 | H & C Oil Operating Inc. | Plainville, KS 67663 | Oil & Gas Operator | Sep 2025 |
| 7 | H & D Drilling Co Inc | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2024 |
| 8 | H & D Exploration LLC | Hoisington, KS 67544 | Oil & Gas Operator | Sep 2025 |
| 9 | H & D Operating Company | Refugio, TX 78377 | Oil & Gas Operator | May 2015 |
| 10 | H & F Oil Development | Kansas City, MO 64114-5149 | Gas Operator | Jun 1999 |
| 11 | H & H & S Oil Producers | | Oil Operator | Jan 2025 |
| 12 | H & H Compressors, Inc. | | Oil & Gas Operator | Oct 1997 |
| 13 | H & H Drilling Company | Davis, OK 73030-2703 | Oil & Gas Operator | May 2014 |
| 14 | H & H Energy Inc | Tuttle, OK 73089 | Oil Operator | May 2001 |
| 15 | H & H Energy Of Ohio LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2024 |
| 16 | H & H Exploration | Tulsa, OK 74132 | Oil & Gas Operator | Jan 2006 |
| 17 | H & H Oil Co. #1 | | Oil Operator | Jan 2025 |
| 18 | H & H Oil Compan | | Oil & Gas Operator | Aug 1995 |
| 19 | H & H Oil Company | | Oil & Gas Operator | Sep 2025 |
| 20 | H & H Oil Company, A General Partnership | Plainville, KS 67663 | Oil Operator | Feb 1997 |
| 21 | H & H Oil Producers | | Oil & Gas Operator | Jan 2025 |
| 22 | H & H Oil Productions | Tulsa, OK 74145 | Oil Operator | Jul 1999 |
| 23 | H & H Oil, LLC | Lincolnville, KS 66858 | Oil Operator | Sep 2025 |
| 24 | H & H Operating | Olney, TX 76374 | Oil & Gas Operator | Feb 2026 |
| 25 | H & H Petroleum, LLC | San Antonio, TX 78213 | Oil Operator | Feb 2026 |
| 26 | H & H Producing | Wadsworth, OH 44281 | Oil & Gas Operator | Dec 1993 |
| 27 | H & H Production | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 28 | H & H Production Company | Muenster, TX 76252 | Oil & Gas Operator | Oct 2005 |
| 29 | H & H Production, Inc. | Topeka, KS 66614 | Oil Operator | May 1997 |
| 30 | H & H Star Energy Inc | Traverse City, MI 49684 | Oil & Gas Operator | Aug 2016 |
| 31 | H & H Supply Inc | | Gas Operator | Mar 1985 |
| 32 | H & K Energy Corp | Columbus, OH 43229 | Oil & Gas Operator | Dec 1991 |
| 33 | H & K Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |
| 34 | H & K Oil Company (A) | Luling, TX 78648 | Oil Operator | Feb 2026 |
| 35 | H & L Exploration Company, LLC | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2026 |
| 36 | H & L Gas Co. | Sunray, TX 79086 | Gas Operator | Apr 2018 |
| 37 | H & L Operating Co., L.L.P. | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 38 | H & L Operating Co., LLC | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2021 |
| 39 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 40 | H & L Operators | | Oil & Gas Operator | Dec 2002 |
| 41 | H & L Oprerating Company LLP | Amarillo, TX 79114 | Oil & Gas Operator | Nov 2019 |
| 42 | H & M Oil Producers | Littleton, CO 80160 | Oil & Gas Operator | Apr 2000 |
| 43 | H & M Packers Serv. L.L.C. | | Oil Operator | Dec 2019 |
| 44 | H & M Petroleum Corporation | Lincoln, NE 68516 | Oil & Gas Operator | Jun 2025 |
| 45 | H & M Productions L.L.C. | Overland Park, KS 66210 | Oil Operator | May 1998 |
| 46 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 47 | H & N Operating Co., Inc. | | Oil & Gas Operator | Oct 1997 |
| 48 | H & O Oil Co. | | Oil & Gas Operator | Dec 1989 |
| 49 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 50 | H & P Exploration Co. | Alice, TX 78333 | Oil & Gas Operator | May 2019 |
| 51 | H & P Partnership | La Vernia, TX 78121 | Oil Operator | Feb 2026 |
| 52 | H & R Expl & Production Inc | Sidney, NE 69162 | Oil Operator | May 2007 |
| 53 | H & R Exploratio | | Oil Operator | Feb 1992 |
| 54 | H & R Oil Company | | Oil & Gas Operator | Dec 2000 |
| 55 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 56 | H & S Drilling Co Inc | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2016 |
| 57 | H & S Gas & Oil | Trafford, PA 15085-2828 | Gas Operator | Dec 2009 |
| 58 | H & S Investments LLC | Fairview, PA 16415-1807 | Oil & Gas Operator | Dec 2025 |
| 59 | H & S Oil Co., LLC | Cherryvale, KS 67335 | Oil Operator | Oct 2024 |
| 60 | H & S Oil Company | Kellyville, OK 74039 | Oil & Gas Operator | Mar 1998 |
| 61 | H & S Oil LLC | Roswell, NM 882022387 | Oil & Gas Operator | Jul 2013 |
| 62 | H & S Operating Company Inc | Winesburg, OH 44690 | Oil & Gas Operator | Dec 2024 |
| 63 | H & S Production | Farmington, NM 87401 | Oil Operator | Dec 2007 |
| 64 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 65 | H & T Brock Oil Company LLC | Comanche, OK 73529-7140 | Oil & Gas Operator | Feb 2024 |
| 66 | H & T Disposal | Abilene, TX 79608 | Oil Operator | Apr 2003 |
| 67 | H & T Exploration, Inc. | Longview, TX 75605 | Oil & Gas Operator | Feb 2026 |
| 68 | H & T Oil & Gas Company, Inc. | Alice, TX 78333 | Oil & Gas Operator | Mar 2008 |
| 69 | H & W Drilling Inc | Racine, OH 45769 | Oil & Gas Operator | Dec 2023 |
| 70 | H & W Energy | Youngstown, OH 44512 | Oil & Gas Operator | Dec 2015 |
| 71 | H & W Marketing Company | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2002 |
| 72 | H & W Oil | Electra, TX 76360 | Oil & Gas Operator | Mar 2008 |
| 73 | H & W Oil Company, Incorporated | Palm Desert, CA 92255 | Oil Operator | Nov 2017 |
| 74 | H & W Oil Corpor | | Oil Operator | Dec 1996 |
| 75 | H & W Operating | Woodward, OK 73802 | Oil & Gas Operator | Apr 2000 |
| 76 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Feb 2026 |
| 77 | H A L Petroleum | | Oil Operator | Oct 1987 |
| 78 | H A Oil & Gas Company | Laverne, OK 73848-0100 | Gas Operator | Mar 2002 |
| 79 | H And H | Gonzales, TX 78629 | Oil Operator | Feb 1999 |
| 80 | H And H Star Energy Inc Dba Petrostar Energy | | Oil & Gas Operator | Feb 2004 |
| 81 | H And K Resources Inc | | Oil Operator | Dec 2012 |
| 82 | H B Oil & Gas Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Jun 2000 |
| 83 | H C M Energy LLC | Billings, MT 59102 | Oil Operator | Jul 2003 |
| 84 | H D Oil Company | Thermopolis, WY 82443 | Oil Operator | Dec 2025 |
| 85 | H E C H Corporation | Ada, OK 74820-9528 | Oil Operator | Sep 2019 |
| 86 | H E C I Exploration Company | | Oil & Gas Operator | Dec 1990 |
| 87 | H F Production Co., LTD. | Wichita Falls, TX 76309 | Oil Operator | Feb 2020 |
| 88 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 89 | H G H Oil Company | | Oil Operator | Dec 1990 |
| 90 | H H Exploration, Inc. | Incline VLLG, NV 89451 | Gas Operator | Feb 2018 |
| 91 | H H H Oil Company | | Oil Operator | Jan 2025 |
| 92 | H I Smith Oil & Gas Inc | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2024 |
| 93 | H K A Enterprises Inc | Kettle, KY 42717 | Oil Operator | Dec 2021 |
| 94 | H K Keesee And C J Keesee Trust | Farmington, NM 87499 | Gas Operator | Dec 2025 |
| 95 | H L Altier Service Co Inc | Canton, OH 44718-3752 | Oil & Gas Operator | Dec 2013 |
| 96 | H L Brown Jr | Midland, TX 79702 | Oil & Gas Operator | May 2001 |
| 97 | H L Brown Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 98 | H L L Inc | Scottsdale, AZ 85251 | Oil & Gas Operator | Jan 2007 |
| 99 | H M Jarred & Walsh-Watts | | Oil & Gas Operator | Sep 1992 |
| 100 | H M S Energies Inc | Claremore, OK 74017 | Oil & Gas Operator | Mar 1994 |