| 1 | Aec Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | May 2004 |
| 2 | Augustus Energy Partners LLC | Billings, MT 59102 | Oil & Gas Operator | Feb 2014 |
| 3 | Axia Energy LLC | Hghlands Ranch, CO 80129-2258 | Oil & Gas Operator | Jun 2016 |
| 4 | Ballard Petroleum LLC | Billings, MT 59102-5406 | Oil & Gas Operator | Apr 2014 |
| 5 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 6 | Bayless Producer LLC* Robert L | | Oil & Gas Operator | Feb 2024 |
| 7 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | May 2018 |
| 8 | Black Hills Plateau Production LLC | | Oil & Gas Operator | May 2018 |
| 9 | Caerus Piceance LLC | | Oil & Gas Operator | Feb 2024 |
| 10 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 11 | Chandler & Associates LLC | | Oil & Gas Operator | Jul 2001 |
| 12 | D & G Roustabout Service | | Oil & Gas Operator | Jan 2024 |
| 13 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 14 | Fees Jr And Son Oil & Gas* Walter S | | Oil & Gas Operator | Jan 2024 |
| 15 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 16 | Fram Operating LLC | | Oil & Gas Operator | Dec 2018 |
| 17 | Gordon Engineering Inc | | Gas Operator | Feb 2024 |
| 18 | Grand Mesa Operating Company | Wichita, KS 67206 | Oil & Gas Operator | Feb 2024 |
| 19 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jul 2017 |
| 20 | Grynberg* Jack Dba Grynberg Petroleum Co | | Oil & Gas Operator | Jan 2023 |
| 21 | Jelco G V Inc | | Gas Operator | Dec 2005 |
| 22 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 23 | Laramie Energy II LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2015 |
| 24 | Laramie Energy LLC | | Oil & Gas Operator | Aug 2013 |
| 25 | Linn Bros Oil & Gas Inc | Fruita, CO 81521 | Oil & Gas Operator | Feb 2024 |
| 26 | Locin Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 27 | Lone Mountain Production Company | | Oil & Gas Operator | Jan 2016 |
| 28 | Maralex Resources Inc | Ignacio, CO 81137 | Oil & Gas Operator | Feb 2024 |
| 29 | Markwest Resources Inc | Englewood, CO 801125004 | Oil & Gas Operator | Jun 2003 |
| 30 | Mesa Hydrocarbons LLC | | Oil & Gas Operator | Sep 2003 |
| 31 | National Fuel Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Feb 2024 |
| 32 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 33 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Apr 2024 |
| 34 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 35 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 36 | Par Pacific Holdings Inc | | Oil & Gas Operator | Apr 2015 |
| 37 | Petro Mex Resources | | Oil & Gas Operator | Feb 2024 |
| 38 | Piceance Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 39 | Pioneer Oil & Gas | South Jordan, UT 84095 | Oil & Gas Operator | Jan 2014 |
| 40 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 41 | Qep Uinta Basin Inc | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2007 |
| 42 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 43 | Red Oak Operating, LLC | Magnolia, AR 71753 | Oil & Gas Operator | Feb 2024 |
| 44 | Rocky Mountain Operating Co Inc | Littleton, CO 80121 | Oil & Gas Operator | Dec 2011 |
| 45 | Slate River Resources LLC | Denver, CO 80293 | Oil & Gas Operator | Apr 2008 |
| 46 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 47 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 48 | Strachan Exploration Inc | Englewood, CO 80112 | Oil & Gas Operator | Feb 2024 |
| 49 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 50 | Tbi Production Company | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2004 |
| 51 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 52 | Twin Arrow Inc | Rangely, CO 81648 | Oil & Gas Operator | Sep 2009 |
| 53 | Virtex Petroleum Company, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Jan 2008 |
| 54 | Vision Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2024 |
| 55 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2024 |
| 56 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 57 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |