| 1 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 2 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 3 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 4 | B & B Drilling Co. | Milano, TX 76556 | Oil & Gas Operator | Jul 2015 |
| 5 | Bissell Operating LLC | San Antonio, TX 78216 | Oil Operator | Oct 2016 |
| 6 | Black Jack Services, L.L.C. | Bastrop, TX 78602 | Oil & Gas Operator | Oct 2025 |
| 7 | Brothers Oil & Equipment, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 8 | Chaparral Natural Resources,Inc. | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 9 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | Oct 2025 |
| 10 | Clark Operating Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 11 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 12 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 13 | Finkelstein, Jack, Trustee | Houston, TX 77027 | Oil & Gas Operator | Apr 2007 |
| 14 | Genesis Well Service | Colleyville, TX 76034 | Oil Operator | Oct 2025 |
| 15 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 16 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 17 | Henscheid, Rufus | Muenster, TX 76252 | Oil Operator | Jan 2020 |
| 18 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |
| 19 | J.W. Service Company | Smithville, TX 78957 | Oil & Gas Operator | Oct 2025 |
| 20 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Oct 2025 |
| 21 | Kaye Poth Oil Corp. | Seguin, TX 78155 | Oil & Gas Operator | May 1998 |
| 22 | Lynch, W. W. | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2006 |
| 23 | Magnum Oilfield Services LLC | Bakersfield, CA 93309 | Oil Operator | Oct 2025 |
| 24 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 25 | Mobile Production Systems, Inc. | Austin, TX 78711 | Oil & Gas Operator | Feb 1995 |
| 26 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 27 | Multipay Energy, Inc. | Austin, TX 78749 | Oil Operator | Oct 2025 |
| 28 | North Texas Energy,Inc. | Dallas, TX 75252 | Oil Operator | Oct 2025 |
| 29 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 30 | Orisol Oil Co. | Houston, TX 77206 | Oil Operator | Jun 2000 |
| 31 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 32 | P&F Operations, LLC | Thrall, TX 76578 | Oil Operator | Oct 2025 |
| 33 | Panamerican Operating Inc | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 34 | Patton Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 35 | Penrod Oil Company Of Texas, Inc | Milano, TX 76556 | Oil & Gas Operator | Oct 2025 |
| 36 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 37 | R.D. Oil Company | Austin, TX 78755 | Oil & Gas Operator | Oct 2025 |
| 38 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Oct 2025 |
| 39 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 40 | Secondary Oil Corp., Inc. | Austin, TX 78750 | Oil Operator | Apr 1999 |
| 41 | Sheldon Resources, L.P. | Bryan, TX 77805 | Oil & Gas Operator | Oct 2025 |
| 42 | Spiller, H. G. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1993 |
| 43 | Stingray Oil Company, Inc. | Mullin, TX 76864 | Oil Operator | Oct 2025 |
| 44 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | Oct 2025 |
| 45 | Thrall Operating Company, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 46 | Tracker Oil & Gas, Inc. | Bastrop, TX 78602 | Oil & Gas Operator | Oct 2025 |
| 47 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 48 | U S Energy Corp. Of Amer. Inc. | Ranger, TX 76470 | Oil & Gas Operator | Oct 2025 |
| 49 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Oct 2025 |
| 50 | Voskamp Exploration, Inc. | Midland, TX 79708 | Oil & Gas Operator | Sep 2010 |
| 51 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 52 | Wilhite Productions | MC Dade, TX 78650 | Oil & Gas Operator | Oct 2012 |
| 53 | Winchester Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | Oct 2025 |
| 54 | Window Operating Co., The | Coleman, TX 76834 | Oil & Gas Operator | Oct 2025 |