| 1 | 31 Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 2 | 4R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Apr 1997 |
| 3 | 5R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 4 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | May 2025 |
| 5 | Acoma Oil Corporation | Saint Paul, MN 55102 | Oil & Gas Operator | May 2025 |
| 6 | Adair Resources Inc. | Ennis, TX 75120 | Oil & Gas Operator | Apr 2018 |
| 7 | Akma, Inc. | Ore City, TX 75683 | Oil & Gas Operator | Apr 1999 |
| 8 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | May 2025 |
| 9 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 10 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 11 | American Eagle Resources, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 12 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 13 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 14 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 15 | Ap Operating, Inc. | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 16 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 17 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 18 | Armor Resources LLC | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 19 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 20 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 21 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | May 2025 |
| 22 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 23 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 24 | B & B Oil, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | May 2025 |
| 25 | Balance Production Corporation | Temple, TX 76503 | Oil & Gas Operator | May 2025 |
| 26 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 27 | Barbee, R.L. Operating, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | May 2025 |
| 28 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | May 2025 |
| 29 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 30 | Bay-Tech Operating Co., Inc. | Tyler, TX 75713 | Oil & Gas Operator | Mar 2024 |
| 31 | BBC&D Enterprises, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2024 |
| 32 | Beacon Petroleum MGMT.,Inc. | Dallas, TX 75244 | Oil & Gas Operator | Mar 1997 |
| 33 | Benchmark Oil & Gas Co. | Houston, TX 77282 | Oil & Gas Operator | May 2025 |
| 34 | Benco Energy Inc | Tionesta, PA 16353-5851 | Oil & Gas Operator | Dec 2002 |
| 35 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 36 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 37 | Black Diamond Operating Co., LLC | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2009 |
| 38 | Blakemore, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Dec 2012 |
| 39 | Bledsoe Petro Corporation | Dallas, TX 75201 | Oil & Gas Operator | Dec 2000 |
| 40 | Bowles Energy, Inc. | Longview, TX 75601 | Oil & Gas Operator | May 2025 |
| 41 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 42 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 43 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | May 2025 |
| 44 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 45 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 46 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 47 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 48 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 49 | Brooks Petroleum Company | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 50 | Brooks Petroleum Inc | Kilgore, TX 75663 | Oil & Gas Operator | May 1999 |
| 51 | Brothers Oil & Equipment, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 52 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 53 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 54 | Brown, H.L. Operating, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 55 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 56 | Bryant - Chase Energy Corp. | Tyler, TX 75701 | Oil & Gas Operator | Aug 2004 |
| 57 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 58 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 59 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 60 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 61 | C. W. Resources, Inc. | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 62 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 63 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 64 | Cape, Randy | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 65 | Card Operating Company, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 1995 |
| 66 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 67 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 68 | Cci East Texas Upstream LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2021 |
| 69 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Feb 2025 |
| 70 | CH-Seon Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 71 | CHB Interests, LLC | Kilgore, TX 75663 | Oil Operator | Oct 2011 |
| 72 | CHB Investments | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2004 |
| 73 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 74 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 75 | Chestnut Explor. And Prod., Inc. | Dallas, TX 75208 | Oil & Gas Operator | May 2025 |
| 76 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 77 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 78 | Circle "M" Energy Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 2003 |
| 79 | Circle-S Energy, LLC | McKinney, TX 75071 | Oil & Gas Operator | May 2025 |
| 80 | CL&F Operating LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2022 |
| 81 | Classic Operating Co. LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 82 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 83 | Coho Resources Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2002 |
| 84 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 85 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 86 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 87 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 88 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 89 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 90 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 91 | Craton Operating LLC | Bellaire, TX 77401 | Oil & Gas Operator | May 2025 |
| 92 | Crest Resources & Expl. Corp. | Houston, TX 77079 | Oil & Gas Operator | Dec 1998 |
| 93 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 94 | Crosspoint Energy Company | Dallas, TX 75205 | Oil & Gas Operator | Oct 2007 |
| 95 | CTL Oil & Gas Corporation | Buchanan Dam, TX 78609 | Oil & Gas Operator | Nov 2020 |
| 96 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 97 | D.O.E. Energy | Palestine, TX 75801 | Oil & Gas Operator | May 2025 |
| 98 | Daco Oil | Joinerville, TX 75658 | Oil & Gas Operator | Aug 2019 |
| 99 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 100 | Daniel Explorations Inc | Georgetown, TX 78627 | Oil & Gas Operator | Apr 2009 |