| 1 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Nov 2024 |
| 2 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 3 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 4 | American Shoreline, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Nov 2024 |
| 5 | Ameristate Exploration LLC | Austin, TX 78701 | Oil & Gas Operator | Nov 2009 |
| 6 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 7 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2024 |
| 8 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 9 | API Operating Co. | Houston, TX 77036 | Oil & Gas Operator | Nov 2024 |
| 10 | Beach Exploration, Inc. | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 11 | Blakenergy Operating, LLC | Spring, TX 77386 | Oil & Gas Operator | Nov 2024 |
| 12 | BNP Petroleum Corporation | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Nov 2024 |
| 13 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 14 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 15 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 16 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 17 | Bruington Operating, L.L.C. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2015 |
| 18 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 19 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 20 | Camden Resources, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2015 |
| 21 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2024 |
| 22 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 23 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 24 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 25 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 26 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 27 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 28 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 29 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 30 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 31 | Dewbre Petroleum Corporation | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Nov 2024 |
| 32 | Dinero Oil Corporation | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Nov 1999 |
| 33 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 34 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 35 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Nov 2024 |
| 36 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Nov 2024 |
| 37 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 38 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 39 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Nov 2024 |
| 40 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 41 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Nov 2024 |
| 42 | Etc Texas Pipeline, LTD. | San Antonio, TX 78258 | Oil Operator | Sep 2023 |
| 43 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 44 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Nov 2024 |
| 45 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Nov 2024 |
| 46 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Sep 2024 |
| 47 | Flint Oak Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | Nov 2024 |
| 48 | Fort Apache Energy, Inc. | Boerne, TX 78015 | Oil & Gas Operator | Nov 2024 |
| 49 | Fortune Operating Company | Willis, TX 77378 | Oil & Gas Operator | Nov 2024 |
| 50 | Franklin, J.W. Oil Operator | | Oil & Gas Operator | Nov 2001 |
| 51 | Gary Oil & Gas | Deer Park, TX 77536 | Oil & Gas Operator | Nov 2024 |
| 52 | Geiser, D. Allen | Portland, TX 78374 | Oil & Gas Operator | Oct 2005 |
| 53 | Genesis Crude Oil LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 54 | Greehey And Company LTD | San Antonio, TX 78216 | Oil & Gas Operator | May 2020 |
| 55 | Gulfmark Energy Inc | Houston, TX 77027 | Gas Operator | Apr 2023 |
| 56 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 57 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 58 | Headington Energy Partners, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Nov 2024 |
| 59 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 60 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 61 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 62 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Nov 2024 |
| 63 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Nov 2024 |
| 64 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 65 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 66 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Nov 2024 |
| 67 | Infinity Hydrocarbons LLC | Houston, TX 77079 | Oil & Gas Operator | Aug 2022 |
| 68 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Nov 2024 |
| 69 | Ipr USA Corp. | Irving, TX 75039 | Oil & Gas Operator | Jun 2009 |
| 70 | Jil Oil Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Nov 2024 |
| 71 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Nov 2024 |
| 72 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Nov 2024 |
| 73 | Kindee Oil & Gas Texas, LLC | Houston, TX 77084 | Oil & Gas Operator | Apr 2016 |
| 74 | La Parrita Oil & Gas, Inc. | Rosenberg, TX 77471 | Oil & Gas Operator | May 2002 |
| 75 | La Sara Operating Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 76 | Lamar Oil & Gas, Inc. | Rockport, TX 78381 | Oil & Gas Operator | Nov 2024 |
| 77 | Lamay Corporation | Rosenberg, TX 77471 | Oil & Gas Operator | Nov 2024 |
| 78 | Liberty National Corp | Dallas, TX 75206 | Oil Operator | Dec 2006 |
| 79 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | Nov 2024 |
| 80 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 81 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Nov 2024 |
| 82 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 83 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 84 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 85 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Nov 2024 |
| 86 | MK Operating Company LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Nov 2024 |
| 87 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 88 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Nov 2024 |
| 89 | Modena Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2024 |
| 90 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 91 | North Central Oil Corp. | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 92 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 93 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 94 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 95 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 96 | Penn VIrginia Oil & Gas Corp | Houston, TX 77024 | Oil & Gas Operator | Dec 2018 |
| 97 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 98 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 99 | Petroquest Exploration, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2008 |
| 100 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Nov 2024 |