| 1 | 801 LLC | Artesia, NM 88211 | Oil & Gas Operator | Oct 2023 |
| 2 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | Dec 2025 |
| 3 | Aeternum Energy, LLC | Tyler, TX 75713 | Oil & Gas Operator | Dec 2025 |
| 4 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 5 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 6 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 7 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 8 | Apex Natural Gas, LLC | Houston, TX 77002 | Gas Operator | Dec 2025 |
| 9 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 10 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 11 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 12 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 13 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 14 | B & T Operating Co. | Dawson, TX 76639 | Oil & Gas Operator | Dec 2025 |
| 15 | Barnett Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 16 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Dec 2025 |
| 17 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Dec 2025 |
| 18 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Dec 2025 |
| 19 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 20 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 21 | Beehive Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 22 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 23 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 24 | Black Gold Energy LLC | Jenks, OK 74037 | Oil Operator | Jun 2024 |
| 25 | Boni Oil Incorporated | Nacogdoches, TX 75961 | Oil & Gas Operator | Dec 2025 |
| 26 | Booher Engineering, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 27 | Bowles Energy, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 28 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 29 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 30 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 31 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Dec 2025 |
| 32 | Brandon Energy, Inc. | Bullard, TX 75757 | Oil & Gas Operator | Nov 2007 |
| 33 | Brangus Energy LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 34 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2025 |
| 35 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 36 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 37 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 38 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 39 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2025 |
| 40 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 41 | Buckhorn Oilfield Service Inc | Kilgore, TX 75663 | Oil Operator | Dec 2025 |
| 42 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 43 | Bull Oil Company, LLC | Livingston, TX 77351 | Oil & Gas Operator | Dec 2025 |
| 44 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 45 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 46 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Dec 2025 |
| 47 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 48 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Dec 2025 |
| 49 | Cape Operating, Inc. | Longview, TX 75608 | Oil & Gas Operator | Nov 2007 |
| 50 | Cape, Randy | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 51 | Card Operating Company, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 1995 |
| 52 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Oct 2025 |
| 53 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 54 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 55 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 56 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 57 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 58 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 59 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 60 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 61 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 62 | Cippele Resources Co. | Longview, TX 75608 | Oil & Gas Operator | May 1994 |
| 63 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 64 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 65 | Common Resources L.L.C. | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 66 | Comstock Oil & Gas, LLC | Frisco, TX 75034 | Oil & Gas Operator | Dec 2025 |
| 67 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 68 | Cougar Oil, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Jun 2009 |
| 69 | Covey Park Resources LLC | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 70 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Dec 2025 |
| 71 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 72 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 73 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 74 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 75 | Daniels Corporation, The | Seabrook, TX 77586 | Oil & Gas Operator | Dec 2025 |
| 76 | Dantex Oil & Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 77 | Davis Gulf Coast, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 78 | Deep Rock Resources, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 79 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 80 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 81 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Dec 2025 |
| 82 | Dual Production Partners, LLC | Nacogdoches, TX 75963 | Oil & Gas Operator | Dec 2025 |
| 83 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 84 | Eagle Valley Development LLC | Austin, TX 78738 | Oil & Gas Operator | Oct 2023 |
| 85 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Dec 2025 |
| 86 | Eastex Operating, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2003 |
| 87 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 88 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Dec 2025 |
| 89 | Elms Oil Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 90 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 91 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 92 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 93 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 94 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Oct 2025 |
| 95 | Enerquest Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 96 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 97 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 98 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 99 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 100 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |