| 1 | Acadian Gas Pipeline System | | Oil Operator | Jan 2025 |
| 2 | Atc Realty Eight, Inc. | | Oil & Gas Operator | Nov 1988 |
| 3 | Brock Exploration Corporation | New Orleans, LA 70112-1707 | Oil & Gas Operator | Jan 1999 |
| 4 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 5 | Cambridge Energy Corporation | | Oil & Gas Operator | Jul 2003 |
| 6 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 7 | Cypress Gas Pipeline, LLC | | Oil Operator | Sep 2019 |
| 8 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 9 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 10 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 11 | Headwaters Oil Company | | Oil & Gas Operator | Oct 1981 |
| 12 | Hicks Production Co. | | Oil & Gas Operator | Apr 1991 |
| 13 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Oct 2025 |
| 14 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 15 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 16 | Louisiana Gas Service Co. | | Oil Operator | May 2004 |
| 17 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 18 | Martin Exploration Co. | | Oil & Gas Operator | Apr 1986 |
| 19 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 20 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Oct 2025 |
| 21 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 22 | Mineral Ventures, Inc. | | Oil & Gas Operator | Dec 2024 |
| 23 | Palace Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2007 |
| 24 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 25 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 26 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 27 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 28 | Tesla Resources, Inc. | | Oil & Gas Operator | Aug 1996 |
| 29 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 30 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 31 | Todd Oil Corp. Of La. Inc. | | Oil & Gas Operator | Jul 2000 |
| 32 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
| 33 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |