| 1 | H & D Operating Company | Refugio, TX 78377 | Oil & Gas Operator | May 2015 |
| 2 | H & H Operating | Olney, TX 76374 | Oil & Gas Operator | Mar 2025 |
| 3 | H & H Petroleum, LLC | San Antonio, TX 78213 | Oil Operator | Mar 2025 |
| 4 | H & H Production | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 5 | H & H Production Company | Muenster, TX 76252 | Oil & Gas Operator | Oct 2005 |
| 6 | H & K Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |
| 7 | H & K Oil Company (A) | Luling, TX 78648 | Oil Operator | Mar 2025 |
| 8 | H & L Exploration Company, LLC | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2025 |
| 9 | H & L Gas Co. | Sunray, TX 79086 | Gas Operator | Apr 2018 |
| 10 | H & L Operating Co., L.L.P. | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 11 | H & L Operating Co., LLC | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2021 |
| 12 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 13 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 14 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 15 | H & P Exploration Co. | Alice, TX 78333 | Oil & Gas Operator | May 2019 |
| 16 | H & P Partnership | La Vernia, TX 78121 | Oil Operator | Mar 2025 |
| 17 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 18 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 19 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 20 | H & T Disposal | Abilene, TX 79608 | Oil Operator | Apr 2003 |
| 21 | H & T Exploration, Inc. | Longview, TX 75605 | Oil & Gas Operator | Mar 2025 |
| 22 | H & T Oil & Gas Company, Inc. | Alice, TX 78333 | Oil & Gas Operator | Mar 2008 |
| 23 | H & W Marketing Company | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2002 |
| 24 | H & W Oil | Electra, TX 76360 | Oil & Gas Operator | Mar 2008 |
| 25 | H & W Oil Company, Incorporated | Palm Desert, CA 92255 | Oil Operator | Nov 2017 |
| 26 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2025 |
| 27 | H And H | Gonzales, TX 78629 | Oil Operator | Feb 1999 |
| 28 | H F Production Co., LTD. | Wichita Falls, TX 76309 | Oil Operator | Feb 2020 |
| 29 | H H Exploration, Inc. | Incline VLLG, NV 89451 | Gas Operator | Feb 2018 |
| 30 | H L Brown Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 31 | H Oil Company, Inc. | Edna, TX 77957 | Oil & Gas Operator | Mar 2005 |
| 32 | H P S Investments | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 33 | H R E Rental Company | Premont, TX 78375 | Oil & Gas Operator | Sep 2015 |
| 34 | H&G Petroleum Corporation | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 35 | H&K Energy | Stockdale, TX 78160 | Oil & Gas Operator | Jul 2005 |
| 36 | H&M Production, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Aug 2012 |
| 37 | H&P Oil & Gas LLC | Mertzon, TX 76941 | Oil & Gas Operator | Mar 2025 |
| 38 | H&P Operating | Megargel, TX 76370 | Oil & Gas Operator | Jan 2015 |
| 39 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 40 | H-S Exploration | Perryton, TX 79070 | Oil & Gas Operator | Mar 2025 |
| 41 | H-Two-O Investments | Iowa Park, TX 76367 | Oil Operator | Sep 2019 |
| 42 | H. & J. Drilling Company | Fort Worth, TX 76114 | Oil & Gas Operator | Aug 2003 |
| 43 | H. & L. Oil Company | Midland, TX 79707 | Oil & Gas Operator | Mar 2005 |
| 44 | H. Bryan Poff, LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Oct 2018 |
| 45 | H. C. Oil Co. | Weatherford, TX 76085 | Oil & Gas Operator | Mar 2025 |
| 46 | H. D. Investments | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 47 | H. I. M. Producers | Graham, TX 76450 | Oil & Gas Operator | May 1999 |
| 48 | H.A.N. Operating Incorporated | Clyde, TX 79510 | Oil & Gas Operator | Aug 2016 |
| 49 | H.E.R. Operating, LLC | Silsbee, TX 77656 | Oil & Gas Operator | Mar 2025 |
| 50 | H.E.X.T. Operating, LTD. | Buna, TX 77612 | Oil Operator | Mar 2024 |
| 51 | H.K.E. | Stafford, TX 77497 | Oil & Gas Operator | Mar 2025 |
| 52 | H.L. Clark Oil Company LLC | Whitesboro, TX 76273 | Oil Operator | Mar 2025 |
| 53 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 54 | H.P. Slagel Producing Co., LLC | San Angelo, TX 76902 | Oil Operator | Mar 2025 |
| 55 | H3 Operating, LLC | Springtown, TX 76082 | Oil & Gas Operator | May 2020 |
| 56 | Ha.P.C. Oil, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Aug 2006 |
| 57 | Haas, C. F. Oil & Gas Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Mar 2025 |
| 58 | Haass Ranch Oil Company, LLC | Castroville, TX 78009 | Oil Operator | Mar 2025 |
| 59 | Habanero Oil & Gas Operating,LLC | Austin, TX 78701 | Oil & Gas Operator | Feb 2018 |
| 60 | Haber Resources Corporation | Houston, TX 77063 | Oil & Gas Operator | Mar 1999 |
| 61 | Hacker Brothers Oil Company, Inc | Muenster, TX 76252 | Oil & Gas Operator | May 2004 |
| 62 | Hacker Brothers Well Service,Inc | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 63 | Hacker, Freddie J. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2012 |
| 64 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Mar 2025 |
| 65 | Hadaway Engineering Inc | Canadian, TX 79014 | Oil & Gas Operator | Jul 2015 |
| 66 | Haddad Boynton, LLC | Jonesville, TX 75659 | Oil Operator | Mar 2025 |
| 67 | Hadley Oil | Nocona, TX 76255 | Oil Operator | Jan 2014 |
| 68 | Hadley Oil Company, LLC | Nocona, TX 76255 | Oil Operator | Mar 2025 |
| 69 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 70 | Haggard Operating Group/Oil | Atascosa, TX 78002 | Oil & Gas Operator | Mar 2025 |
| 71 | Haggard, E. A. | Graham, TX 76450 | Oil & Gas Operator | Apr 2001 |
| 72 | Haider Operating, LLC | Pampa, TX 79066 | Oil & Gas Operator | Mar 2025 |
| 73 | Haigood & Campbell | Archer City, TX 76351 | Oil & Gas Operator | Mar 2025 |
| 74 | Haigood, Danny | Portland, TX 78374 | Oil & Gas Operator | Mar 2008 |
| 75 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 76 | Haimo Oil & Gas LLC | Houston, TX 77042 | Oil & Gas Operator | Aug 2020 |
| 77 | Hair, Roger D. | Post, TX 79356 | Oil & Gas Operator | Mar 2025 |
| 78 | Halbouty, Michel T. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 79 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 80 | Halcon Resources Operating, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2013 |
| 81 | Hale Oil & Gas Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 82 | Hale, Mike E. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2003 |
| 83 | Halek Energy L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Jan 2014 |
| 84 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 85 | Hall Energy Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2016 |
| 86 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 87 | Hall Exploration, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 88 | Hall Oil & Gas | Coahoma, TX 79511 | Oil & Gas Operator | Mar 2025 |
| 89 | Hall Oil And Gas LLC | Midland, TX 79707 | Oil & Gas Operator | Mar 2025 |
| 90 | Hall, D. Corporation | La Grange, TX 78945 | Oil & Gas Operator | Mar 2013 |
| 91 | Hall, E. G., Oil Co. | Mexia, TX 76667 | Oil & Gas Operator | Mar 2025 |
| 92 | Hall-Houston Expl. II, L.P. | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 93 | Hall-Houston Expl. III, L.P. | Houston, TX 77027 | Oil & Gas Operator | Jul 2013 |
| 94 | Hall-Houston Oil Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 95 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 96 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | Mar 2025 |
| 97 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 98 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 99 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 100 | Halo Energy L.L.C. | Kilgore, TX 75662 | Oil Operator | Mar 2025 |