| 1 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | Sep 2025 |
| 2 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Sep 2025 |
| 3 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Sep 2025 |
| 4 | American National Petroleum Co. | Houston, TX 77057 | Oil & Gas Operator | Aug 1995 |
| 5 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 6 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 7 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 8 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Sep 2025 |
| 9 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 10 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 11 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 12 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Sep 2025 |
| 13 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 14 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 15 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 16 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Sep 2025 |
| 17 | BBX Operating, L.L.C. | Austin, TX 78738 | Oil & Gas Operator | Sep 2025 |
| 18 | Bergman Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Feb 1994 |
| 19 | Beusa Energy, Inc. | Spring, TX 77380 | Oil & Gas Operator | Apr 2011 |
| 20 | Black Stone Energy Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2004 |
| 21 | Black Stone Energy Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 22 | Black Stone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | Feb 1997 |
| 23 | Blue Ridge Group, Inc. | Bowling Green, KY 42101 | Oil & Gas Operator | Dec 2023 |
| 24 | Bock & Bacon, Inc. | Houston, TX 77098 | Oil & Gas Operator | May 1999 |
| 25 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Sep 2025 |
| 26 | Brito Oil Co., Inc | Wichita, KS 67201 | Oil & Gas Operator | Dec 2009 |
| 27 | Brooklyn Union Explor. Co., Inc. | Houston, TX 77010 | Oil & Gas Operator | Jan 1994 |
| 28 | Brown, Buddy | Livingston, TX 77351 | Oil & Gas Operator | Sep 2025 |
| 29 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Sep 2025 |
| 30 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 31 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 32 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 33 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Sep 2025 |
| 34 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 35 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |
| 36 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 37 | Classic Oil & Gas, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jan 2004 |
| 38 | Clover Production Company | Sourlake, TX 77659 | Oil & Gas Operator | Sep 2025 |
| 39 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 40 | Coastal Investments Inc. | El Campo, TX 77437 | Oil & Gas Operator | Sep 2025 |
| 41 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 42 | Coastal Production Company, Inc. | El Campo, TX 77437 | Oil & Gas Operator | Aug 1995 |
| 43 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Sep 2025 |
| 44 | Comstock Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2012 |
| 45 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 46 | Contour Expl And Prod, LLC | Dallas, TX 75204 | Oil & Gas Operator | Sep 2025 |
| 47 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Sep 2025 |
| 48 | Crestmont Operating LLC | New York, NY 10151 | Oil Operator | Sep 2025 |
| 49 | Crossroads Energy L.P. | Houston, TX 77064 | Oil & Gas Operator | Jun 2011 |
| 50 | Crossroads Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Mar 2018 |
| 51 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 52 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2025 |
| 53 | Danmark Energy Services, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Apr 2021 |
| 54 | Davis Southern Operating Co LLC | Houston, TX 77004 | Oil & Gas Operator | Sep 2025 |
| 55 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Sep 2025 |
| 56 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 57 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 58 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 59 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 60 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 61 | Doggy Oil Corp | Decatur, GA 30031 | Oil & Gas Operator | Sep 2025 |
| 62 | Dominion Corporation | Houston, TX 77001 | Oil & Gas Operator | Dec 2010 |
| 63 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 64 | Douglas Petroleum Inc. | Spring, TX 77379 | Oil & Gas Operator | Nov 2010 |
| 65 | Drum Oil & Gas, Inc. | Houston, TX 77082 | Oil & Gas Operator | Sep 2025 |
| 66 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 67 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Sep 2025 |
| 68 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 69 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 70 | Energy Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Sep 2025 |
| 71 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 72 | Enpower Resources Inc. | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2025 |
| 73 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 74 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 75 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 76 | Evans, Julian | Houston, TX 77024 | Oil & Gas Operator | Nov 1995 |
| 77 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 78 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 79 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Sep 2025 |
| 80 | Faith Energy Exploration, Inc. | Ennis, TX 75119 | Oil & Gas Operator | Mar 2019 |
| 81 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 82 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Sep 2025 |
| 83 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Jun 2025 |
| 84 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 85 | Finch-Crestmont | Houston, TX 77027 | Oil & Gas Operator | Oct 2012 |
| 86 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Sep 2025 |
| 87 | Fletcher Operating, LLC | Fairhope, AL 36532 | Oil & Gas Operator | Sep 2025 |
| 88 | Fort Apache Energy, Inc. | Boerne, TX 78015 | Oil & Gas Operator | Sep 2025 |
| 89 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Sep 2025 |
| 90 | Foundation Oil Company, Inc. | Kingwood, TX 77325 | Oil & Gas Operator | Sep 2025 |
| 91 | Freeman Expl. & Prod. Co., Inc. | Houston, TX 77279 | Oil & Gas Operator | Aug 2020 |
| 92 | Frio Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 93 | Galloway Energy Co. | Tomball, TX 77377 | Oil & Gas Operator | Sep 2025 |
| 94 | Gei Management Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Sep 1993 |
| 95 | Geo Asset Management, Inc. | Katy, TX 77493 | Oil & Gas Operator | Sep 2025 |
| 96 | Geo Engineering, Inc. | Houston, TX 77027 | Oil & Gas Operator | Jun 2009 |
| 97 | Geopetra Partners, LLC | Dallas, TX 75231 | Oil & Gas Operator | Sep 2025 |
| 98 | Geotech Production Inc | Centennial, CO 80016 | Oil & Gas Operator | Jun 2020 |
| 99 | Goodrich Pet. Co. Of Louisiana | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 100 | Gordy Oil Company | Houston, TX 77007 | Oil & Gas Operator | Sep 2025 |