| 1 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 2 | Atlas Resources LLC Dba Atlas Rockies LLC | | Gas Operator | Jun 2017 |
| 3 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Aug 2025 |
| 4 | Black Raven Energy Inc | | Oil & Gas Operator | Apr 2017 |
| 5 | Diamond Operating, Inc. | | Oil & Gas Operator | Feb 2022 |
| 6 | DJ Production Services Inc | | Oil & Gas Operator | Sep 2012 |
| 7 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 8 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Oct 2025 |
| 9 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 10 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 11 | Lance Oil & Gas Company Inc | Kirtland, NM 87417 | Oil & Gas Operator | Mar 2013 |
| 12 | Mountain Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2016 |
| 13 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 14 | Own Resources Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 15 | PCR Operating LLC | | Oil & Gas Operator | Jul 2024 |
| 16 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 17 | Walsh Production Inc | | Oil & Gas Operator | Nov 2008 |
| 18 | Wme Yates LLC | | Gas Operator | Dec 2023 |