| 1 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 2 | Blackhorse Energy, LLC Of Texas | | Oil Operator | Jan 2025 |
| 3 | Booher Energy, LLC | | Oil Operator | Dec 2024 |
| 4 | Booher Engineering, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 5 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 6 | BPR Energy, Inc. | | Oil & Gas Operator | Apr 2021 |
| 7 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Oct 2025 |
| 8 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 9 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 10 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 11 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 12 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 13 | Dave Easom Production Co. Inc. | | Oil & Gas Operator | May 2000 |
| 14 | Deltaus Corporation | | Oil & Gas Operator | Oct 1985 |
| 15 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 16 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 17 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 18 | Destin Resources LLC | | Gas Operator | Jul 2018 |
| 19 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 20 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 21 | Flash Gas & Oil Southwest, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Oct 2019 |
| 22 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 23 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 24 | Franks Petroleum Inc. | | Oil & Gas Operator | Nov 1994 |
| 25 | Gde Tiger Petroleum, LLC | | Oil & Gas Operator | Dec 2024 |
| 26 | Geoterre Operating, L.L.C. | | Oil & Gas Operator | Jun 2025 |
| 27 | Germany Exploration Co | Carrollton, TX 75006 | Oil & Gas Operator | Nov 1986 |
| 28 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 29 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 30 | Gulf Outlet Resources, L.L.C. | | Oil & Gas Operator | Apr 2008 |
| 31 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 32 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Oct 2025 |
| 33 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Oct 2025 |
| 34 | J. P. Van Way | | Oil & Gas Operator | Dec 2024 |
| 35 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 36 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 37 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Oct 2025 |
| 38 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 39 | Lake Ronel Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Jul 2017 |
| 40 | Louisiana Gas Development Corp | | Oil & Gas Operator | Jan 2025 |
| 41 | Marmaton Oil Company | Houston, TX 77002 | Oil & Gas Operator | Jul 1998 |
| 42 | Mesa Petroleum Co. | | Oil & Gas Operator | Aug 1985 |
| 43 | Metairie Energy Company, Inc. | | Oil & Gas Operator | Nov 2019 |
| 44 | Nicor Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 45 | Norexco Inc. | | Oil & Gas Operator | Aug 1988 |
| 46 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Oct 2025 |
| 47 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 48 | Perna Oil & Gas LLC | | Oil & Gas Operator | Nov 2024 |
| 49 | Philip B. Berry Oper Co., Inc. | | Oil & Gas Operator | Jun 1990 |
| 50 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 51 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 52 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 53 | Shana Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2002 |
| 54 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 55 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 56 | Sonoran Energy Inc. | Addison, TX 75001 | Oil & Gas Operator | Oct 2025 |
| 57 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 58 | Southern Natural Gas Company LLC | | Oil & Gas Operator | Nov 2024 |
| 59 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 60 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 61 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 62 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 63 | Summit Oil & Gas LLC | | Oil & Gas Operator | Aug 2025 |
| 64 | Texas Gas Exploration Corp. | | Oil & Gas Operator | Nov 1986 |
| 65 | The Stone Oil Corporation | | Oil & Gas Operator | May 1985 |
| 66 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Oct 2025 |
| 67 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 68 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Oct 2025 |
| 69 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 70 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 71 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
| 72 | Wacker Oil Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 73 | Yuma E & P Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |