| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | 4-Sight Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2006 |
| 3 | 4-Sight Operating Company, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 4 | 4R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Apr 1997 |
| 5 | 5R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Feb 2025 |
| 6 | A J A Companies | Tyler, TX 75703 | Oil Operator | Feb 2025 |
| 7 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 8 | Ableready, Inc. | Houston, TX 77269 | Oil & Gas Operator | Feb 2025 |
| 9 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 10 | Accidie Exploration And Dev.,Inc | Plano, TX 75023 | Oil & Gas Operator | Feb 2025 |
| 11 | Acirema Corporation | Longview, TX 75608 | Oil & Gas Operator | Feb 2025 |
| 12 | Adamson Exploration Co. | Kilgore, TX 75662 | Oil Operator | Feb 2025 |
| 13 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 14 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 15 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2025 |
| 16 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 17 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 18 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 19 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 20 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 21 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 22 | Ames Financial, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2024 |
| 23 | Amity Oil Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1977 |
| 24 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 25 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 26 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 27 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Feb 2025 |
| 28 | Andrew Alan Exploration, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2017 |
| 29 | Anthony Oil & Gas Co. | Shreveport, LA 71135 | Oil Operator | May 1993 |
| 30 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 31 | Arapahoe Resources LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2024 |
| 32 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 33 | Archon Resources LLC | Houston, TX 77074 | Oil & Gas Operator | Jan 2015 |
| 34 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 35 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 36 | Arcooil Corp | San Antonio, TX 78205 | Oil & Gas Operator | Feb 2025 |
| 37 | Arena Resources LLC | Longview, TX 75608 | Oil & Gas Operator | Nov 2024 |
| 38 | Argent Petroleum Corporation | Center, TX 75935 | Oil & Gas Operator | Feb 2025 |
| 39 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 40 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 41 | Ark-La-Tex Energy Partners, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2013 |
| 42 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2025 |
| 43 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 44 | Armor Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Feb 2025 |
| 45 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 46 | Arrow Rock Energy, LLC | Houston, TX 77079 | Oil & Gas Operator | Mar 2018 |
| 47 | Asa Oil & Gas, Inc. | Brady, TX 76825 | Oil & Gas Operator | Feb 2025 |
| 48 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 49 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 50 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 51 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Feb 2025 |
| 52 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2025 |
| 53 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 54 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Feb 2025 |
| 55 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 56 | Axtel Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 2025 |
| 57 | B & B Oil, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | Feb 2025 |
| 58 | B & S Production | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2009 |
| 59 | B M Energy, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2022 |
| 60 | B&L Operating Co. | Price, TX 75687 | Oil & Gas Operator | Feb 2025 |
| 61 | Bachtell Oil & Gas, LTD. | Longview, TX 75605 | Oil & Gas Operator | Feb 2025 |
| 62 | Bachtell, Charles Ray | Longview, TX 75605 | Oil & Gas Operator | Feb 2004 |
| 63 | Badger Energy, Inc. | Austin, TX 78714 | Oil & Gas Operator | Feb 2025 |
| 64 | Bahr Oil & Gas | Shalimar, FL 32579 | Oil & Gas Operator | Feb 2025 |
| 65 | Banner Oil & Gas LLC | Oklahoma City, OK 73159 | Oil & Gas Operator | Nov 2024 |
| 66 | Barber, B. S. | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |
| 67 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 68 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Feb 2025 |
| 69 | Basa Resources Inc | Dallas, TX 75254 | Oil & Gas Operator | Feb 2025 |
| 70 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Feb 2025 |
| 71 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 72 | BBHP Oilfield Services LLC | Kilgore, TX 75662 | Oil Operator | Feb 2025 |
| 73 | Beckville Disp Operations, LLC | Henderson, TX 75652 | Oil Operator | Feb 2025 |
| 74 | Bell & Kinley Company | Piedmont, OK 73078 | Oil & Gas Operator | Aug 2017 |
| 75 | Below Ground Level LLC | Sand Springs, OK 74063 | Oil & Gas Operator | Feb 2025 |
| 76 | Berry, Thomas N. & Co. | Stillwater, OK 74076 | Oil & Gas Operator | Feb 2012 |
| 77 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 78 | Big Run Production Company | Tyler, TX 75701 | Oil & Gas Operator | Feb 2025 |
| 79 | Bigfoot Energy Services LLC | Carthage, TX 75633 | Oil & Gas Operator | Aug 2024 |
| 80 | BKM Production | Gainesville, TX 76240 | Oil & Gas Operator | Feb 2025 |
| 81 | Black Diamond Operating Co., LLC | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2009 |
| 82 | Black Horse Resources, LLC | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 2024 |
| 83 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Feb 2025 |
| 84 | Block T Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 85 | Bluegrass Energy Inc | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 86 | Bluemark Energy LLC | Tulsa, OK 74120 | Oil & Gas Operator | Nov 2024 |
| 87 | Bowles Energy, Inc. | Longview, TX 75601 | Oil & Gas Operator | Feb 2025 |
| 88 | Bowles Properties, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 1998 |
| 89 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 90 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 91 | Bracken Production Company | Midland, TX 79702 | Oil & Gas Operator | Oct 1995 |
| 92 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2025 |
| 93 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Feb 2025 |
| 94 | Brandon Energy, Inc. | Bullard, TX 75757 | Oil & Gas Operator | Nov 2007 |
| 95 | Branta Production Company LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2025 |
| 96 | Brashear Production Service, Inc | Longview, TX 75602 | Oil & Gas Operator | Mar 2008 |
| 97 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 98 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2025 |
| 99 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 100 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |