| 1 | 6a Production | Pampa, TX 79066 | Oil & Gas Operator | Sep 2025 |
| 2 | Ananda Energy Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2021 |
| 3 | Barker Production Co. | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2010 |
| 4 | Barker Production Co., LP | San Angelo, TX 76904 | Oil & Gas Operator | Sep 2025 |
| 5 | Bce-Mach III LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 6 | Blakemore, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Dec 2012 |
| 7 | Caprock Engineering, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2018 |
| 8 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 9 | CWF Energy, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1997 |
| 10 | Darrah Oil Company LLC | Wichita, KS 67201 | Oil & Gas Operator | Sep 2025 |
| 11 | Davenport, Vernon | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2008 |
| 12 | Davenport, Vernon Prod. Co. | Dumas, TX 79029 | Oil & Gas Operator | Jan 2002 |
| 13 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 14 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 15 | Estacado Energy, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 1999 |
| 16 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 17 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 18 | Fairway Links Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2016 |
| 19 | Farrex, Inc. | Vernon, TX 76384 | Oil & Gas Operator | Oct 2008 |
| 20 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 21 | Gunn Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2025 |
| 22 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Sep 2025 |
| 23 | Hill, Hub, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 1994 |
| 24 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Sep 2025 |
| 25 | J-Gar, Inc. | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2003 |
| 26 | J-Gar, LTD. | Amarillo, TX 79101 | Gas Operator | Dec 2019 |
| 27 | J.B. Exploration | Cactus, TX 79013 | Oil & Gas Operator | Sep 1997 |
| 28 | Jackson, Jeral W. Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2004 |
| 29 | Kimbrel Oil Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2025 |
| 30 | Lionheart Energy Corporation | Durango, CO 81301 | Oil & Gas Operator | Sep 2025 |
| 31 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Sep 2025 |
| 32 | McDowell Ranch | Shamrock, TX 79079 | Gas Operator | Sep 2025 |
| 33 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 34 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 35 | Morgas | Shamrock, TX 79079 | Gas Operator | Nov 1994 |
| 36 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | Sep 2025 |
| 37 | Parallel Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Jan 2010 |
| 38 | Pennington, W. L., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 1996 |
| 39 | PNG Gathering, LLC | Wellington, TX 79095 | Oil & Gas Operator | Dec 2024 |
| 40 | PNG Production, LLC | Wellington, TX 79095 | Oil & Gas Operator | Sep 2025 |
| 41 | Prairie Energy Company | Fort Worth, TX 76185 | Oil & Gas Operator | Mar 2003 |
| 42 | Premier Energy, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2008 |
| 43 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2025 |
| 44 | Questa Operating Company, LLC | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2025 |
| 45 | Reneau Oil Co. | Shamrock, TX 79079 | Oil & Gas Operator | Sep 2025 |
| 46 | Reneau, James R. | Shamrock, TX 79079 | Gas Operator | Oct 2001 |
| 47 | Reneau, James Seed Co. | Shamrock, TX 79079 | Oil & Gas Operator | Sep 2025 |
| 48 | Ricon Petroleum Company | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2008 |
| 49 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2025 |
| 50 | Shamrock Texas Partners L.P. | San Angelo, TX 76904 | Oil & Gas Operator | Sep 2025 |
| 51 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 52 | Sidwell Operating Company, L.P. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2025 |
| 53 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Sep 2025 |
| 54 | Stahl Petroleum Co. | Amarillo, TX 79118 | Oil & Gas Operator | Aug 2003 |
| 55 | Stine-Hawkins | Mansfield, TX 76063 | Gas Operator | Sep 2025 |
| 56 | Supa Energy, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Sep 2025 |
| 57 | Tascosa Petroleum Corporation | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2025 |
| 58 | Wheeler Oil Co. (A) | Amarillo, TX 79114 | Gas Operator | Apr 2001 |
| 59 | Wildcat Cement Co. | Shamrock, TX 79079 | Oil & Gas Operator | May 2015 |
| 60 | Wischkaemper, James K. | Shamrock, TX 79079 | Oil & Gas Operator | Aug 2023 |
| 61 | Wischkaemper, Kenneth | Shamrock, TX 79079 | Oil & Gas Operator | Sep 2025 |