| 1 | 7711 Corporation, The | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 2 | Aj'S Pump Truck Service, Inc. | Odessa, TX 79760 | Oil & Gas Operator | May 2025 |
| 3 | Akg Operating Company | Austin, TX 78701 | Oil & Gas Operator | May 2025 |
| 4 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 5 | Aln Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 1993 |
| 6 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 7 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 8 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 9 | American Royalty | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2005 |
| 10 | Ames Oil Corporation Of Texas | Austin, TX 78720 | Oil & Gas Operator | Mar 2015 |
| 11 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 12 | Amx Energy, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 13 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 14 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 15 | Andrus Resources Corporation | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 16 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 17 | Arcturus Operating Company | Addison, TX 75001 | Oil & Gas Operator | May 2025 |
| 18 | Arledge, Terry | Rockdale, TX 76567 | Oil & Gas Operator | Sep 2019 |
| 19 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 20 | Arrow Exploration Company | Plano, TX 75075 | Oil & Gas Operator | Dec 2004 |
| 21 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 22 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 23 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | May 2025 |
| 24 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 25 | Atlas Energy Corporation (Del.) | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2025 |
| 26 | Audrey Oil & Gas LLC | Pampa, TX 79066 | Oil & Gas Operator | May 2025 |
| 27 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | May 2025 |
| 28 | B & L Minerals, Inc. | Houston, TX 77036 | Oil & Gas Operator | Aug 2003 |
| 29 | B.A.C.O.C., Inc. | Bryan, TX 77802 | Oil & Gas Operator | May 1997 |
| 30 | B.W.O.C., Inc. | Plano, TX 75026 | Oil & Gas Operator | May 2025 |
| 31 | Badger Energy, Inc. | Austin, TX 78714 | Oil & Gas Operator | May 2025 |
| 32 | Baker, Brent Oil & Gas, Inc. | Oklahoma City, OK 73149 | Oil & Gas Operator | May 2025 |
| 33 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 34 | Barry Rock Oil Co. Inc. | Plain Dealing, LA 71064 | Oil & Gas Operator | Dec 2024 |
| 35 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | May 2025 |
| 36 | Baytex Energy USA, Inc. | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 37 | BBL Operating Company LLC | Colleyville, TX 76034 | Oil & Gas Operator | May 2025 |
| 38 | BBX Operating, L.L.C. | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 39 | BCL Operating, LLC | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 40 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 41 | Belco Operating Corp. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 42 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 43 | Beta Oil Corporation | San Antonio, TX 78232 | Oil & Gas Operator | May 2025 |
| 44 | Bexco Operating, Inc. | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 45 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 46 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | May 2025 |
| 47 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | May 2025 |
| 48 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | May 2025 |
| 49 | Brammer Supply Inc | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2014 |
| 50 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 51 | Brazos Resources, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Dec 1998 |
| 52 | Brazos Valley Operating, LLC | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 53 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2025 |
| 54 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 55 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 56 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 57 | Brighton Energy LLC | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 58 | Brock, J. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 59 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 60 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | May 2025 |
| 61 | Buckeye Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2018 |
| 62 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 63 | Bush, Mark A. Oil And Gas Inc. | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 64 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 65 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 66 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | May 2025 |
| 67 | Cameron Engineering, Inc | Montgomery, TX 77356 | Oil & Gas Operator | Jun 2003 |
| 68 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 69 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | May 2025 |
| 70 | Cantro Exploration, Inc. | San Antonio, TX 78270 | Oil & Gas Operator | May 2000 |
| 71 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 72 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | May 2025 |
| 73 | CDC Operating Company | Dallas, TX 75218 | Oil & Gas Operator | May 2025 |
| 74 | Centex Energy, LLC | Bryan, TX 77802 | Oil & Gas Operator | May 2025 |
| 75 | Central Plains Oil&Gas Corp. (A) | Bryan, TX 77802 | Oil & Gas Operator | Mar 2003 |
| 76 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 77 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 78 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |
| 79 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | May 2025 |
| 80 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 81 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 82 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 83 | Chisos Operating, Inc. | Midland, TX 79702 | 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 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 87 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 88 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 89 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 90 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | May 2025 |
| 91 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 92 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 93 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 94 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 95 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 96 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 97 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 98 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 99 | Crawford Energy, Incorporated | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 100 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |