| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | Aber Oil & Gas Co. | Tyler, TX 75702 | Oil & Gas Operator | Nov 2013 |
| 3 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Sep 2025 |
| 4 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Sep 2025 |
| 5 | Alt Production, LLC | Kilgore, TX 75663 | Oil Operator | Sep 2025 |
| 6 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 7 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 8 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Sep 2025 |
| 9 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 10 | Aratex Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2003 |
| 11 | Ark-La-Tex Production, LLC | Doddridge, AR 71834 | Oil Operator | Jan 2025 |
| 12 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 13 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 14 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Sep 2025 |
| 15 | Bahr Oil & Gas | Shalimar, FL 32579 | Oil & Gas Operator | Sep 2025 |
| 16 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 17 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Sep 2025 |
| 18 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 19 | Beehive Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 20 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 21 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 22 | Black Bayou Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2025 |
| 23 | Booher Engineering, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2025 |
| 24 | Borean Oil Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2013 |
| 25 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 26 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2025 |
| 27 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 28 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 29 | Brooks Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2025 |
| 30 | Brooks Petroleum Company | Tyler, TX 75703 | Oil & Gas Operator | Sep 2025 |
| 31 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Sep 2025 |
| 32 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 33 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 2025 |
| 34 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 35 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2025 |
| 36 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 37 | Cass Energy LLC | MT Vernon, TX 75457 | Oil Operator | Sep 2025 |
| 38 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 39 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Jun 2025 |
| 40 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 41 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Sep 2025 |
| 42 | Chaparral Operating, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Sep 2025 |
| 43 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Sep 2025 |
| 44 | Classic Oil & Gas, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jan 2004 |
| 45 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 46 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | Sep 2025 |
| 47 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 48 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 49 | Craig, Carl | Olney, TX 76374 | Oil & Gas Operator | Sep 2025 |
| 50 | Crow, David | Shreveport, LA 71106 | Oil & Gas Operator | May 2001 |
| 51 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 52 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 53 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 54 | Diamond A Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Jun 2001 |
| 55 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 56 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Sep 2025 |
| 57 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Sep 2025 |
| 58 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 59 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 60 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 61 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 62 | Eagle Oil Management, LLC | Shreveport, LA 71106 | Oil & Gas Operator | Sep 2025 |
| 63 | Eason Production Company | Atlanta, TX 75551 | Oil & Gas Operator | May 2007 |
| 64 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 65 | Enbridge G & P (East Texas) L.P. | Houston, TX 77056 | Oil & Gas Operator | Sep 2018 |
| 66 | Enbridge Pipelines (Ne Texas) LP | Houston, TX 77002 | Oil & Gas Operator | Jan 2010 |
| 67 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 68 | Erg Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2015 |
| 69 | Express Energy Group, LLC | Atlanta, TX 75551 | Oil Operator | Sep 2025 |
| 70 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 71 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 72 | Fair Oil, LC | Tyler, TX 75710 | Oil & Gas Operator | Oct 2001 |
| 73 | Fossil Petroleum LLC | San Angelo, TX 76906 | Oil & Gas Operator | Sep 2025 |
| 74 | Gallery Petroleum LLC | Houston, TX 77036 | Oil & Gas Operator | Sep 2025 |
| 75 | Geotech Production Inc | Centennial, CO 80016 | Oil & Gas Operator | Jun 2020 |
| 76 | GMX Resources, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2014 |
| 77 | Goldco Operating LLC | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 78 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 79 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 80 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 81 | Gulf Central Petroleum Corp. | Dallas, TX 75252 | Oil & Gas Operator | Sep 2025 |
| 82 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 83 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 84 | Howell & Sandlin, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2001 |
| 85 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Sep 2025 |
| 86 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2025 |
| 87 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 88 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Sep 2025 |
| 89 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Sep 2025 |
| 90 | Jackson Energy Development, Inc. | Cedar Park, TX 78613 | Oil & Gas Operator | Sep 2025 |
| 91 | Jones, Carl W. Operator | Shreveport, LA 71106 | Oil & Gas Operator | Jul 1999 |
| 92 | JP Oil Wyoming LLC | Lafayette, LA 70505 | Oil & Gas Operator | Jul 2025 |
| 93 | Justiss Oil Company, Inc. | Jena, LA 71342 | Oil & Gas Operator | Apr 2025 |
| 94 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 95 | Katy Resources LLC | Arlington, TX 76016 | Oil & Gas Operator | Sep 2025 |
| 96 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 97 | Killingsworth Oil Co. | Longview, TX 75606 | Oil & Gas Operator | Sep 2025 |
| 98 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Sep 2025 |
| 99 | Klo Oil & Gas, L.L.C. | Tulsa, OK 74120 | Oil & Gas Operator | Jan 2023 |
| 100 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |