| 1 | 4 Boots Oil Company, LLC | Leander, TX 78641 | Oil Operator | May 2025 |
| 2 | 7711 Corporation, The | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 3 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | May 2025 |
| 4 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 5 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 6 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 7 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 8 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 9 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 10 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 11 | Beta Gas & Oil, Inc. | Tulsa, OK 74136 | Oil Operator | Jun 2001 |
| 12 | Beta Operating Company, LLC | Houston, TX 77210 | Oil & Gas Operator | Apr 2020 |
| 13 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 14 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 15 | Booher Engineering, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 16 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | May 2025 |
| 17 | Bridas Energy USA, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Aug 2008 |
| 18 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 19 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | May 2025 |
| 20 | Century Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 21 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 22 | Chief Operating Company | Houston, TX 77070 | Oil & Gas Operator | Feb 2004 |
| 23 | Clearly Petroleum, LLC | Houston, TX 77086 | Oil & Gas Operator | Jun 2020 |
| 24 | Coastline Operating, L.L.C. | Houston, TX 77027 | Oil & Gas Operator | Dec 2006 |
| 25 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 26 | Coho Resources Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2002 |
| 27 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 28 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 29 | Denver Energy Exploration,LLC | Canyon Lake, TX 78133 | Oil Operator | May 2025 |
| 30 | Dolberry Energy Resources Corp. | Dallas, TX 75252 | Oil Operator | May 2025 |
| 31 | Dominion Minerals Corporation | Houston, TX 77014 | Oil & Gas Operator | Nov 2009 |
| 32 | Domino Prod Services Inc | Bellville, TX 77418 | Oil & Gas Operator | Feb 2004 |
| 33 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | May 2025 |
| 34 | Elson Oil Company | Tulsa, OK 74103-4429 | Oil & Gas Operator | Dec 2016 |
| 35 | Enhanced Energy Partners Corp | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 36 | Escondido Petroleum Company, Inc | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 37 | Evergreen Energy, Inc | Houston, TX 77098 | Oil & Gas Operator | May 2025 |
| 38 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | May 2025 |
| 39 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 40 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 41 | Flat Creek Operating Co. | Rockwall, TX 75087 | Oil & Gas Operator | Jun 2004 |
| 42 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 43 | Fusion XP, Inc. | Arlington, TX 76006 | Oil Operator | Apr 2014 |
| 44 | Future Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 1999 |
| 45 | G.P.C. Oil And Gas Corporation | Midland, TX 79710 | Oil & Gas Operator | Feb 1993 |
| 46 | Galloway Energy Co. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 47 | Gen-Nan Resources & Equip., Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 48 | Gen-Nan Resources & Equip., L.P. | Midland, TX 79702 | Oil & Gas Operator | Jan 2008 |
| 49 | Geosouthern Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 50 | GTG Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 51 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 52 | Hadaway Engineering Inc | Canadian, TX 79014 | Oil & Gas Operator | Jul 2015 |
| 53 | High Chapparal Oil Company | Plntersville, TX 77363 | Oil & Gas Operator | Aug 2003 |
| 54 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2025 |
| 55 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 56 | Howitzer Operating, LLC | Dallas, TX 75380 | Oil Operator | May 2025 |
| 57 | Indexgeo & Associates, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2009 |
| 58 | Ipact | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 59 | Johnson Sanford Op Co., LTD | Leander, TX 78641 | Oil & Gas Operator | May 2025 |
| 60 | Kellco Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Nov 2007 |
| 61 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | May 2025 |
| 62 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 63 | KWS Oil & Gas, LLC | El Campo, TX 77437 | Oil & Gas Operator | May 2025 |
| 64 | Lakehills Production, Inc. | Austin, TX 78701 | Oil & Gas Operator | May 2025 |
| 65 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 66 | Lindow Oil & Gas, LLC | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 67 | Lockout Corporation | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 68 | Lone Wolf Operating Company | Denver, CO 80202 | Oil & Gas Operator | Nov 2005 |
| 69 | Lone Wolf Operating Company, LP | Haxtun, CO 80731 | Oil & Gas Operator | Sep 2009 |
| 70 | LTS Oil & Gas A | Lubbock, TX 79424 | Oil & Gas Operator | May 2025 |
| 71 | LTX Productions, Inc. | Houston, TX 77095 | Oil & Gas Operator | Jul 2008 |
| 72 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 73 | Marino, Charles B. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 74 | Messy Oil And Gas, LLC | Garwood, TX 77442 | Oil & Gas Operator | May 2025 |
| 75 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | May 2025 |
| 76 | Millennium Offshore Group, Inc. | Houston, TX 77007 | Oil & Gas Operator | Sep 2005 |
| 77 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 78 | MLC Operating, LP | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 79 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 80 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 81 | Neostar Energy Co. | Crossville, TN 38572 | Oil & Gas Operator | Feb 2019 |
| 82 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | May 2025 |
| 83 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 84 | North American Drilling Corp | Plano, TX 75093 | Oil & Gas Operator | May 2025 |
| 85 | North Operating Company | Canton, TX 75103 | Oil & Gas Operator | May 2025 |
| 86 | North Star Energy, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Jan 2010 |
| 87 | Nupower Energy, LLC | Houston, TX 77058 | Oil & Gas Operator | May 2025 |
| 88 | Optimum Exploration LLC | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 89 | Oxxn | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2023 |
| 90 | Pedeco, Inc. | Casper, WY 82601 | Oil & Gas Operator | Mar 2008 |
| 91 | Peters Petroleum Corporation | Dallas, TX 75243 | Oil & Gas Operator | Jan 2014 |
| 92 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 93 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 94 | Premier Minerals, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 95 | Prime Natural Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jun 2007 |
| 96 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 97 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | May 2025 |
| 98 | Property Development Group, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | May 2025 |
| 99 | R.T.C. Resources, L.P. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 100 | Reddy Disposals, LLC | Beeville, TX 78104 | Oil Operator | May 2025 |