| 1 | 7711 Corporation, The | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 2 | 801 LLC | Artesia, NM 88211 | Oil & Gas Operator | Oct 2023 |
| 3 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | May 2025 |
| 4 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 5 | Ads | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2010 |
| 6 | Ads Oil & Gas, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 7 | Aegis Fluids Management, LLC | Plano, TX 75093 | Oil & Gas Operator | May 2025 |
| 8 | Aim Consultants Inc. | Rockville, MD 20852 | Oil & Gas Operator | Mar 2008 |
| 9 | Akg Operating Company | Austin, TX 78701 | Oil & Gas Operator | May 2025 |
| 10 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 11 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 12 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 13 | All Am, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2016 |
| 14 | Allegiant Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 15 | American Delta Corporation | Portland, TX 78374 | Oil & Gas Operator | Jun 2013 |
| 16 | American Royalty | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2005 |
| 17 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 18 | Anadarko Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Feb 2006 |
| 19 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 20 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 21 | Anchor Operating Co. | Houston, TX 77055 | Oil & Gas Operator | May 2025 |
| 22 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 23 | Arcturus Operating Company | Addison, TX 75001 | Oil & Gas Operator | May 2025 |
| 24 | Ares Energy, LTD. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 25 | Argent Petroleum Corporation | Center, TX 75935 | Oil & Gas Operator | May 2025 |
| 26 | Arledge, Terry | Rockdale, TX 76567 | Oil & Gas Operator | Sep 2019 |
| 27 | Arrow Exploration Company | Plano, TX 75075 | Oil & Gas Operator | Dec 2004 |
| 28 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | May 2025 |
| 29 | Aruba Petroleum, LTD. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 30 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 31 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | May 2025 |
| 32 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 33 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 34 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 35 | Austin Minerals Inc. | Austin, TX 78720 | Oil & Gas Operator | May 2025 |
| 36 | Austin Ridge Energy Corporation | Houston, TX 77224 | Oil & Gas Operator | May 2025 |
| 37 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 38 | B & B Drilling Co. | Milano, TX 76556 | Oil & Gas Operator | Jul 2015 |
| 39 | B & L Minerals, Inc. | Houston, TX 77036 | Oil & Gas Operator | Aug 2003 |
| 40 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | May 2025 |
| 41 | B D Production Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 42 | B.W.O.C., Inc. | Plano, TX 75026 | Oil & Gas Operator | May 2025 |
| 43 | Baker, Brent Oil & Gas, Inc. | Oklahoma City, OK 73149 | Oil & Gas Operator | May 2025 |
| 44 | Bar-Mac Investments Inc. | Brenham, TX 77834 | Oil & Gas Operator | Jun 2017 |
| 45 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 46 | Bass Petroleum | Austin, TX 78720 | Oil & Gas Operator | Aug 2004 |
| 47 | Bass Petroleum Inc | Austin, TX 78716 | Oil & Gas Operator | May 2025 |
| 48 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 49 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 50 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | May 2025 |
| 51 | BBX Operating, L.L.C. | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 52 | BCL Operating, LLC | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 53 | Beaver Oil Company Inc | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2020 |
| 54 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 55 | Bet-Ro, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | May 2025 |
| 56 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 57 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 58 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | May 2025 |
| 59 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | May 2025 |
| 60 | Bralex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | May 2025 |
| 61 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | May 2025 |
| 62 | Brandes Petroleum, B.P.C.,Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 63 | Brazos Resources, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Dec 1998 |
| 64 | Brazos Valley Operating, LLC | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 65 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 66 | Britnic Oil & Gas, Inc. | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 67 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 68 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 69 | Buckeye Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2018 |
| 70 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 71 | C And S Oil & Gas | San Antonio, TX 78217 | Oil & Gas Operator | Feb 1998 |
| 72 | Cag Petroleum Corp. | Dallas, TX 75382 | Oil & Gas Operator | May 2025 |
| 73 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 74 | Cantro Exploration, Inc. | San Antonio, TX 78270 | Oil & Gas Operator | May 2000 |
| 75 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | May 2025 |
| 76 | Centex Energy, LLC | Bryan, TX 77802 | Oil & Gas Operator | May 2025 |
| 77 | Central Plains Oil&Gas Corp. (A) | Bryan, TX 77802 | Oil & Gas Operator | Mar 2003 |
| 78 | CH-Seon Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 79 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 80 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 81 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 82 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 83 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 84 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | May 2025 |
| 85 | Chmelar, Eugene Oil & Gas | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 86 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 87 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 88 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Feb 2025 |
| 89 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 90 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 91 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 92 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 93 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 94 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 95 | Coleman Oil & Gas Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | May 2025 |
| 96 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 97 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | May 2025 |
| 98 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | May 2025 |
| 99 | Comstock Oil & Gas, LLC | Frisco, TX 75034 | Oil & Gas Operator | May 2025 |
| 100 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |