| 1 | Adams Affiliates, Inc. | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2024 |
| 2 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 3 | Aog, Inc. | Norman, OK 73070 | Oil & Gas Operator | Nov 2014 |
| 4 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 5 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Apr 2024 |
| 6 | Baytech Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 7 | Bird Creek Resources Inc | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2022 |
| 8 | Blake Production Company, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2024 |
| 9 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2024 |
| 10 | Byng Energy Group Inc | Enid, OK 73703 | Oil & Gas Operator | Apr 2024 |
| 11 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 12 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 13 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 14 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 15 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 16 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 17 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2023 |
| 18 | Fortay Inc | Sunray, TX 79086 | Oil & Gas Operator | Apr 2024 |
| 19 | FX Energy Operating, LLC | Canadian, TX 79014 | Oil & Gas Operator | Apr 2024 |
| 20 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 21 | Gunn Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 22 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 23 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Apr 2024 |
| 24 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 25 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 26 | Kana Resources, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Aug 2003 |
| 27 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2024 |
| 28 | Laddex, LTD. | Amarillo, TX 79102 | Oil & Gas Operator | Apr 2024 |
| 29 | Lbo Energy, Inc. | Kentfield, CA 94914 | Gas Operator | Nov 2002 |
| 30 | LDX Operating Company, LLC. | Amarillo, TX 79102 | Oil & Gas Operator | Apr 2024 |
| 31 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 32 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 33 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 34 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 35 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 36 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 37 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | Apr 2024 |
| 38 | Neas Operating, LLC | Canyon Lake, TX 78133 | Oil & Gas Operator | Apr 2024 |
| 39 | Nec Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2024 |
| 40 | Overflow Energy, LLC | Booker, TX 79005 | Oil & Gas Operator | Apr 2024 |
| 41 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2024 |
| 42 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 43 | Polaris Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 44 | Presidio Petroleum LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 45 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 46 | Rio Petroleum, Inc. | Amarillo, TX 79102 | Oil & Gas Operator | Apr 2024 |
| 47 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 48 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 49 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 50 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 51 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 52 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 53 | Sunlight Exploration, Inc. | Canyon, TX 79015 | Oil & Gas Operator | Apr 2024 |
| 54 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 55 | Valero Marketing & Supply Co | San Antonio, TX 78269-6000 | Oil & Gas Operator | Sep 2023 |
| 56 | Vitol Inc | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 57 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Jan 2024 |