| 1 | 31 Operating | | Oil & Gas Operator | Jul 2022 |
| 2 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 3 | Apex Oil Ventures Inc | | Oil & Gas Operator | Sep 2024 |
| 4 | Argali Exploration Company | | Gas Operator | Aug 2024 |
| 5 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 6 | Basin Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 7 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 8 | Bayless Producer LLC* Robert L | | Oil & Gas Operator | Sep 2024 |
| 9 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 10 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Oct 2024 |
| 11 | Bepco Operating Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2006 |
| 12 | Bonneville Fuels Corp | Denver, CO 80290 | Oil & Gas Operator | Jun 2002 |
| 13 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 14 | Btu Energy | | Gas Operator | Aug 2009 |
| 15 | C & J Field Services | | Oil & Gas Operator | Oct 2024 |
| 16 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 17 | Caerus Piceance LLC | | Oil & Gas Operator | Sep 2024 |
| 18 | Carbon Energy Corporation (USA) | Denver, CO 80290 | Oil & Gas Operator | Jul 2004 |
| 19 | CDX Rockies LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 20 | Chandler & Associates LLC | | Oil & Gas Operator | Jul 2001 |
| 21 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 22 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 23 | CLX Oil & Gas LLC | | Oil & Gas Operator | Feb 2005 |
| 24 | Coachman Energy Operating Company LLC | Englewood, CO 80111 | Oil & Gas Operator | May 2024 |
| 25 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 26 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 27 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 28 | Curton Capital Corp | | Oil Operator | Sep 2015 |
| 29 | D & G Roustabout Service | | Oil & Gas Operator | Jan 2024 |
| 30 | Dejour Energy (USA) Corporation | | Oil & Gas Operator | Jun 2014 |
| 31 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 32 | Drindak* Jon | | Oil Operator | Aug 2013 |
| 33 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Oct 2024 |
| 34 | Eddy* Harold E & Florence L | | Oil Operator | Jun 2010 |
| 35 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 36 | Endeavour Operating Corp | Denver, CO 80202-2000 | Oil & Gas Operator | Sep 2015 |
| 37 | EP Energy Management LLC | | Oil & Gas Operator | Jun 2006 |
| 38 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 39 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 40 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 41 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Oct 2024 |
| 42 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 43 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2024 |
| 44 | Genesis Gas & Oil Colorado LLC | | Oil & Gas Operator | Dec 2023 |
| 45 | Genesis Gas & Oil LLC | Kansas City, MO 64108 | Oil & Gas Operator | Aug 2011 |
| 46 | Geomet Operating Company Inc | | Gas Operator | Dec 2013 |
| 47 | Gordon Engineering Inc | | Gas Operator | Oct 2024 |
| 48 | Grand Valley Resources Inc | Seville, OH 44273 | Oil & Gas Operator | Jul 2024 |
| 49 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jul 2017 |
| 50 | Gulfport Energy Corporation | Oklahoma City, OK 73134-5003 | Oil & Gas Operator | Sep 2024 |
| 51 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2024 |
| 52 | KGH Operating Company | Billings, MT 59115 | Oil & Gas Operator | Oct 2024 |
| 53 | KLT Gas Inc | Woodlands, TX 77380 | Oil & Gas Operator | Sep 2004 |
| 54 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 55 | KT Resources LLC | | Oil & Gas Operator | Sep 2024 |
| 56 | Laramie Energy II LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2015 |
| 57 | Lasso Oil & Gas LLC | | Oil & Gas Operator | Jul 2022 |
| 58 | Linn Bros Oil & Gas Inc | Fruita, CO 81521 | Oil & Gas Operator | Oct 2024 |
| 59 | Locin Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 60 | Lone Mountain Production Company | | Oil & Gas Operator | Jan 2016 |
| 61 | Ludwick* James L | | Gas Operator | Apr 2004 |
| 62 | Maralex Resources Inc | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2024 |
| 63 | Matrix Oil Corporation | | Oil & Gas Operator | Oct 2024 |
| 64 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Jul 2024 |
| 65 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 66 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Oct 2024 |
| 67 | Mesa Energy Partners LLC | | Oil & Gas Operator | Sep 2015 |
| 68 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 69 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 70 | National Fuel Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Oct 2024 |
| 71 | Northstar Gas Company Inc | | Oil & Gas Operator | Jan 2016 |
| 72 | Pan American Petroleum Corp | | Oil & Gas Operator | Jan 2008 |
| 73 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 74 | Piceance Energy LLC | | Oil & Gas Operator | Sep 2024 |
| 75 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Aug 2024 |
| 76 | Pioneer Oil & Gas | South Jordan, UT 84095 | Oil & Gas Operator | Jan 2014 |
| 77 | Plug Nickel Oil Company Inc | | Oil & Gas Operator | Sep 2024 |
| 78 | Premium Oil Co | | Oil & Gas Operator | Dec 2015 |
| 79 | Qep Uinta Basin Inc | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2007 |
| 80 | Retamco Operating Inc | Red Lodge, MT 59068 | Oil & Gas Operator | Oct 2024 |
| 81 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 82 | Rio Mesa Resources Inc | | Oil & Gas Operator | Jul 2022 |
| 83 | Saga Petroleum Limited Liability Co Of Co | | Oil & Gas Operator | Jun 2018 |
| 84 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2024 |
| 85 | Sandridge Energy Inc (Federal Wells Only) | | Oil & Gas Operator | Jun 2013 |
| 86 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 87 | Shawnee Oil Development Co Inc | | Oil & Gas Operator | Oct 2024 |
| 88 | Sonterra Energy LLC | Wichita, KS 67226 | Oil & Gas Operator | Jul 2022 |
| 89 | Stehle Oil Company | | Oil Operator | Jun 2021 |
| 90 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 91 | Strachan Exploration Inc | Englewood, CO 80112 | Oil & Gas Operator | Sep 2024 |
| 92 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Oct 2024 |
| 93 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2024 |
| 94 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Aug 2024 |
| 95 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Dec 2023 |
| 96 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 97 | Twin Arrow Inc | Rangely, CO 81648 | Oil & Gas Operator | Sep 2009 |
| 98 | Ursa Operating Company LLC | Denver, CO 80265 | Oil & Gas Operator | Dec 2020 |
| 99 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 100 | Vision Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2024 |