| 1 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 2 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 3 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 4 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 5 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 6 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Dec 2025 |
| 7 | BBX Operating, L.L.C. | Austin, TX 78738 | Oil & Gas Operator | Dec 2025 |
| 8 | Black Stone Energy Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 9 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 10 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 11 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 12 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Dec 2025 |
| 13 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 14 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 15 | Bridwell Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 16 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 17 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 18 | C. W. Resources, Inc. | Longview, TX 75604 | Oil & Gas Operator | Oct 2025 |
| 19 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Dec 2025 |
| 20 | Capital Resource Management Inc | Austin, TX 78716 | Oil & Gas Operator | May 1999 |
| 21 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 22 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 23 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 24 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 25 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 26 | Classic Oil & Gas, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jan 2004 |
| 27 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 28 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 29 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 30 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 31 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 32 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Dec 2025 |
| 33 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 34 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 35 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 36 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 37 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Dec 2025 |
| 38 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 39 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 40 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 41 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 42 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 43 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2025 |
| 44 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 45 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 46 | Hamill, Claud B. Estate Of | Houston, TX 77002 | Oil & Gas Operator | Nov 1995 |
| 47 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 48 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 49 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 50 | Howard, Anthony E. F. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2001 |
| 51 | Ipr Energy Partners, LLC | Bowie, TX 76230 | Oil & Gas Operator | Dec 2025 |
| 52 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 53 | KT Operating Company LLC | Dallas, TX 75231 | Oil & Gas Operator | Feb 2010 |
| 54 | Lackey, William H. Oil And Gas | Shawnee, OK 74804 | Oil & Gas Operator | Feb 2024 |
| 55 | Lacy, R., Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2002 |
| 56 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 57 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2025 |
| 58 | Machin & Associates, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 59 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 60 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 61 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 62 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Dec 2025 |
| 63 | Moses, Tom | Beaumont, TX 77702 | Oil Operator | Dec 2025 |
| 64 | Mustang Energy Inc. | Porter, TX 77365 | Oil & Gas Operator | Mar 2008 |
| 65 | Nadel & Gussman | Tulsa, OK 74103 | Oil & Gas Operator | May 2007 |
| 66 | Nadel And Gussman LLC | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2025 |
| 67 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 68 | Ovation Energy II, LP | Houston, TX 77279 | Oil & Gas Operator | Jun 2011 |
| 69 | P.O.S. Energy, Inc. | Buna, TX 77612 | Oil & Gas Operator | Dec 2025 |
| 70 | Palmer Petroleum, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 71 | Paloma Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 72 | Patara Andover I LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 73 | Patara Oil & Gas LLC | Dallas, TX 75219 | Oil & Gas Operator | Mar 2018 |
| 74 | Patton Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 75 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 76 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 77 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Dec 2025 |
| 78 | Radius Operating, LLC | Round Rock, TX 78664 | Oil & Gas Operator | Dec 2025 |
| 79 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 80 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2025 |
| 81 | Red Stone Resources LLC | Edmond, OK 73013 | Oil Operator | Jun 2023 |
| 82 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 83 | Robert T. Epperson Prod Co, LLC | Tyler, TX 75713 | Gas Operator | Dec 2017 |
| 84 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 85 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 86 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 87 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 88 | Shore Production Co. | Longview, TX 75604 | Oil & Gas Operator | Aug 2005 |
| 89 | SM Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 90 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 91 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 92 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 93 | Stewardship Resources | Roanoke, TX 76262 | Oil & Gas Operator | Jun 2022 |
| 94 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2025 |
| 95 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Sep 2025 |
| 96 | T & T Oil Co. | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2002 |
| 97 | Tana Oil And Gas Corporation | Irving, TX 75062 | Oil & Gas Operator | Mar 2000 |
| 98 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 99 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 100 | TGNR Gulf Coast LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |