| 1 | A & D Exploration Company | Rockport, TX 78381 | Oil & Gas Operator | Mar 2026 |
| 2 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 3 | Atasca Resources, Inc. | Houston, TX 77219 | Oil & Gas Operator | Mar 2026 |
| 4 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 5 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Mar 2026 |
| 6 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Mar 2026 |
| 7 | Bexco Operating, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Mar 2026 |
| 8 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 9 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 10 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 11 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 12 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 13 | Ceniza Petroleum, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2026 |
| 14 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 15 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 16 | Contract Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2012 |
| 17 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 18 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | Mar 2026 |
| 19 | Deguello Operating LLC | College Sta, TX 77840 | Oil & Gas Operator | Mar 2026 |
| 20 | Dewbre Petroleum Corporation | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2026 |
| 21 | Discorbis Oil Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2019 |
| 22 | Dynamic Production, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2026 |
| 23 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 24 | Engelke, R. H. | San Antonio, TX 78230 | Oil & Gas Operator | Mar 2026 |
| 25 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 26 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2026 |
| 27 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Mar 2026 |
| 28 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jan 2026 |
| 29 | Flournoy Production Co. | Alice, TX 78333 | Oil & Gas Operator | Dec 2002 |
| 30 | French Production Incorporated | Houston, TX 77086 | Oil & Gas Operator | Dec 1997 |
| 31 | Geodominion Petroleum | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2012 |
| 32 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 33 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 34 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2026 |
| 35 | Lacy, R., Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2002 |
| 36 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Mar 2026 |
| 37 | London Petroleum Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2026 |
| 38 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2026 |
| 39 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 40 | Miramar Petroleum, Inc. | Corpus Chrsti, TX 78463 | Oil & Gas Operator | Sep 2017 |
| 41 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 42 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2026 |
| 43 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 44 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 45 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Mar 2026 |
| 46 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 47 | Quintana Pet. Corp. | Refugio, TX 78377 | Oil & Gas Operator | Dec 2000 |
| 48 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Mar 2026 |
| 49 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2026 |
| 50 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 51 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 52 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2026 |
| 53 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 54 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 55 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 56 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 57 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 58 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 59 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Mar 2026 |
| 60 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Mar 2026 |
| 61 | Thomfield Energy LLC | Kilgore, TX 75663 | Oil Operator | Mar 2026 |
| 62 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Mar 2026 |
| 63 | Ventex Operating Corp. | Addison, TX 75001 | Oil & Gas Operator | Mar 2026 |
| 64 | Vistatex Energy LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 65 | VT VIstatex Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2026 |
| 66 | Waters Eng. & Operating, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Sep 2013 |
| 67 | Western Gulf Oil & Gas Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2000 |
| 68 | Western Gulf Oil & Gas, LLC | Bishop, TX 78343 | Oil & Gas Operator | Mar 2026 |
| 69 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2026 |
| 70 | World Hydrocarbon, Inc. | Kaufman, TX 75142 | Gas Operator | Apr 1995 |