| 1 | Anderman/Smith Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1995 |
| 2 | Blackrock Operating, LLC | Tuscola, TX 79562 | Oil & Gas Operator | Oct 2025 |
| 3 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 4 | Browning & Welch, Inc. | | Oil & Gas Operator | Mar 2005 |
| 5 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 6 | Delphi Oil, Inc. | | Oil & Gas Operator | Jul 2025 |
| 7 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 8 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 9 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Oct 2025 |
| 10 | Flare, Inc. | | Oil & Gas Operator | Jul 1995 |
| 11 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 12 | Freebird Gas Storage, LLC | Houston, TX 77042 | Gas Operator | May 2000 |
| 13 | Germany Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2002 |
| 14 | Gibraltar Energy Co., Inc. & Richard H. Mason | | Gas Operator | Aug 1995 |
| 15 | Gibraltar Energy Company, Inc. | | Oil & Gas Operator | Jul 2025 |
| 16 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 17 | Griffin Resources, Inc. | | Oil & Gas Operator | Jun 2025 |
| 18 | Gulf Pine Energy, LP | | Oil & Gas Operator | Jun 2025 |
| 19 | Hodge, T.F. & Morrow Oil & Gas Co. | | Oil & Gas Operator | Sep 1993 |
| 20 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 21 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
| 22 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Jul 2025 |
| 23 | Hughes Eastern Petroleum, LTD. | | Oil & Gas Operator | Jun 1986 |
| 24 | Jabsco Oil Operating, LLC | Tuscaloosa, AL 35401 | Oil & Gas Operator | Jul 2025 |
| 25 | Justiss Oil Co., Inc.-Munoco Co. | | Oil & Gas Operator | Dec 2008 |
| 26 | Land And Natural Resource Development, Inc. | Northport, AL 35473 | Oil & Gas Operator | Jul 2025 |
| 27 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Oct 2025 |
| 28 | Local, Inc. | Orange Park, FL 32073 | Oil & Gas Operator | Jun 2025 |
| 29 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 30 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 31 | Michigan Oil Co. | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 32 | Moon-Hines-Tigrett Operating Co., Inc. | | Oil & Gas Operator | Jun 2025 |
| 33 | Morrow Oil & Gas Co. | Terry, MS 39170 | Oil & Gas Operator | Jul 2025 |
| 34 | Morrow Operating Co., Inc. | | Oil Operator | Mar 2003 |
| 35 | Munoco Co. | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 36 | Munoco Co. L.C. | | Oil & Gas Operator | Jun 2003 |
| 37 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 38 | Natural Gas & Oil, Inc. | Fayette, AL 35555 | Oil & Gas Operator | Jul 2025 |
| 39 | Pacific Enterprises Oil Co. (USA) | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 40 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 41 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 42 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 43 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Jul 2025 |
| 44 | Pruet Production Co. & Moon & Hines | | Oil & Gas Operator | Jun 2013 |
| 45 | Roundtree & Associates, Inc. | | Oil & Gas Operator | Jun 2024 |
| 46 | S. Lavon Evans, Jr. Operating Co., Inc. | | Oil & Gas Operator | Aug 2014 |
| 47 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 48 | Sanford Resources Corp. | | Oil & Gas Operator | Jul 1998 |
| 49 | Skelton Operating Co., Inc. | | Oil & Gas Operator | Aug 1980 |
| 50 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 51 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 52 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 53 | Spooner Petroleum Company | | Oil & Gas Operator | Jul 2025 |
| 54 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 55 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 56 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 57 | Taurus Exploration, Inc. | | Oil & Gas Operator | Jul 2025 |
| 58 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 59 | Triangle Operating Co., Inc. | | Gas Operator | Jan 2000 |
| 60 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 61 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 62 | Venus Exploration, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |