| 1 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | Dec 2025 |
| 2 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2025 |
| 3 | Alpine Exploration Co, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Nov 2017 |
| 4 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 5 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 6 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 7 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Dec 2025 |
| 8 | Aminex USA, Inc. | Somerset, TX 78069 | Oil & Gas Operator | May 2018 |
| 9 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 10 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2025 |
| 11 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 12 | Aries Operating, LP | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 13 | Arista Novelty, Inc. | Houston, TX 77256 | Oil & Gas Operator | Feb 1995 |
| 14 | Aroc (Texas) Inc. | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 15 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 16 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 17 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 18 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Dec 2025 |
| 19 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 20 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |
| 21 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 22 | Benchmark Oil & Gas Co. | Houston, TX 77282 | Oil & Gas Operator | Dec 2025 |
| 23 | Bend Petroleum Corp. | Muenster, TX 76252 | Oil & Gas Operator | Nov 2023 |
| 24 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 25 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 26 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Dec 2025 |
| 27 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 28 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 29 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 30 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 31 | Brooklyn Union Explor. Co., Inc. | Houston, TX 77010 | Oil & Gas Operator | Jan 1994 |
| 32 | Brown, Geo. R Partnership,LP,The | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 33 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 34 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 35 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 36 | Carbon Oil Inc | Vidor, TX 77670 | Oil & Gas Operator | Dec 2025 |
| 37 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 38 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 39 | CBN Operating Corp. | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 40 | Century Exploration Houston, Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2011 |
| 41 | Century Exploration Houston, LLC | Austin, TX 78702 | Oil & Gas Operator | Jan 2016 |
| 42 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 43 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 44 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 45 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 46 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Dec 2025 |
| 47 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 48 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Dec 2025 |
| 49 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 50 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 51 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 52 | Coastal Plains Exploration, LLC | Port Lavaca, TX 77979 | Oil & Gas Operator | Dec 2025 |
| 53 | Cokinos, Inc. | Beaumont, TX 77701 | Oil & Gas Operator | Aug 2003 |
| 54 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 55 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Dec 2025 |
| 56 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 57 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 58 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 59 | Csa Exploration Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Aug 2003 |
| 60 | Dartex Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 61 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Dec 2025 |
| 62 | Daystar Operating Company, LLC | Austin, TX 78750 | Oil & Gas Operator | Apr 2008 |
| 63 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Aug 2025 |
| 64 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | Dec 2025 |
| 65 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 66 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 67 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 68 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 69 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 70 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 71 | Dynamic Of Texas, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Aug 2003 |
| 72 | Dynamic Production, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 73 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 74 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 75 | Encore Energy, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 76 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 77 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Aug 2025 |
| 78 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 79 | Enline Operating, L.L.C. | Houston, TX 77019 | Oil & Gas Operator | Jun 1998 |
| 80 | Enline Resources, LLC | Houston, TX 77254 | Oil & Gas Operator | Feb 1996 |
| 81 | Erg Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2015 |
| 82 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Aug 2025 |
| 83 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 84 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 85 | Everest Minerals Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2001 |
| 86 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 87 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 88 | F.I.G. Energy, LLC | Livingston, TX 77399 | Oil & Gas Operator | Dec 2025 |
| 89 | Fairways Exploration & Production, LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 90 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 91 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Dec 2025 |
| 92 | Fort Apache Energy, Inc. | Boerne, TX 78015 | Oil & Gas Operator | Dec 2025 |
| 93 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2025 |
| 94 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 95 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 96 | Great Northern Energy, Inc | Irving, TX 75039 | Oil & Gas Operator | Dec 2025 |
| 97 | Great Western Drilling Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 98 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 99 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 100 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |