| 1 | 31 Operating | | Oil & Gas Operator | Jul 2022 |
| 2 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 3 | Apex Oil Ventures Inc | | Oil & Gas Operator | Aug 2025 |
| 4 | Argali Exploration Company | | Oil & Gas Operator | Aug 2025 |
| 5 | Bayless Producer LLC* Robert L | | Oil & Gas Operator | Oct 2025 |
| 6 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 7 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Nov 2025 |
| 8 | Beeman Oil & Gas LLC | | Oil & Gas Operator | Nov 2025 |
| 9 | C & J Field Services | | Oil & Gas Operator | Oct 2025 |
| 10 | Caerus Piceance LLC | | Oil & Gas Operator | Sep 2025 |
| 11 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 12 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 13 | Eagle Operating, Inc. | Minot, ND 58701 | Oil & Gas Operator | Nov 2025 |
| 14 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 15 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 16 | Genesis Gas & Oil Colorado LLC | | Oil & Gas Operator | Dec 2023 |
| 17 | Geomet Operating Co., Inc. | | Gas Operator | Dec 2013 |
| 18 | Gordon Engineering Inc | | Gas Operator | Sep 2025 |
| 19 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jun 2016 |
| 20 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Aug 2025 |
| 21 | KGH Operating Company | Billings, MT 59115 | Oil & Gas Operator | Oct 2025 |
| 22 | KT Resources LLC | | Oil & Gas Operator | Nov 2025 |
| 23 | Lasso Oil & Gas LLC | | Oil & Gas Operator | Jul 2022 |
| 24 | Linn Bros Oil & Gas Inc | Fruita, CO 81521 | Oil & Gas Operator | Dec 2025 |
| 25 | Locin Oil Corporation | Katy, TX 77494 | Oil & Gas Operator | Dec 2025 |
| 26 | Lone Mountain Production Company | | Oil & Gas Operator | Jan 2016 |
| 27 | Matrix Oil Corporation | | Oil & Gas Operator | Nov 2025 |
| 28 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Dec 2025 |
| 29 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Nov 2025 |
| 30 | Mescko Operating & Prod | Seville, OH 44273 | Oil & Gas Operator | Oct 2025 |
| 31 | National Fuel Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Oct 2025 |
| 32 | Northstar Gas Company, Inc. | | Oil & Gas Operator | Jan 2016 |
| 33 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 34 | Petrohunter Operating Company | | Oil & Gas Operator | Dec 2013 |
| 35 | Piceance Energy LLC | | Oil & Gas Operator | Oct 2025 |
| 36 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Sep 2025 |
| 37 | Plug Nickel Oil Company Inc | | Oil & Gas Operator | Oct 2025 |
| 38 | QB Energy Operating LLC | | Oil & Gas Operator | Oct 2025 |
| 39 | Retamco Operating Inc | Red Lodge, MT 59068 | Oil & Gas Operator | Oct 2025 |
| 40 | Rio Mesa Resources Inc | | Oil Operator | Jul 2022 |
| 41 | Saga Petroleum Limited Liability Co Of Co | | Oil & Gas Operator | Sep 2015 |
| 42 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 43 | Shawnee Oil Development Co Inc | | Oil & Gas Operator | Oct 2025 |
| 44 | Sonterra Energy LLC | Wichita, KS 67226 | Oil & Gas Operator | Jul 2022 |
| 45 | Stehle Oil Company | | Oil Operator | Jun 2021 |
| 46 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Oct 2025 |
| 47 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 48 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 49 | Twin Arrow Inc | Rangely, CO 81648 | Oil & Gas Operator | Sep 2009 |
| 50 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 51 | Vision Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 52 | Vitruvian Exploration LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2016 |
| 53 | West Texas Operating Co LLC D/B/A Xtreme Energy Co | Victoria, TX 77902-2326 | Oil & Gas Operator | Oct 2025 |
| 54 | Western Interior Energy Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 55 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 56 | Woodard* Sandra K | | Oil Operator | Jul 2024 |
| 57 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Nov 2025 |