| 1 | 8 North LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 2 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 3 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 4 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 5 | Argo Petroleum Corporation | | Oil & Gas Operator | Dec 1989 |
| 6 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 7 | Bear Oil And Gas Inc | Las Vegas, NV 89107 | Oil & Gas Operator | Jul 2016 |
| 8 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Oct 2025 |
| 9 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 10 | Bison IV Operating LLC | | Oil & Gas Operator | Oct 2025 |
| 11 | Borchert R V | Sidney, NE 69162 | Oil Operator | Apr 2009 |
| 12 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 13 | BP Production Company LLC | Evergreen, CO 80439 | Oil Operator | Jul 2001 |
| 14 | Braden Oil | | Oil & Gas Operator | Mar 2007 |
| 15 | Buchanan Wayman W | San Antonio, TX 78212 | Oil & Gas Operator | Sep 1990 |
| 16 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 17 | C And M Oil Inc | Kimball, NE 69145 | Oil & Gas Operator | Dec 2024 |
| 18 | CCRP Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2024 |
| 19 | Central Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 20 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 21 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 22 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 23 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 24 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 25 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2025 |
| 26 | Corrida Oil Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 1990 |
| 27 | Cowan Oil Company | | Oil Operator | Sep 1990 |
| 28 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 29 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 30 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 31 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 32 | Department Of Energy | Casper, WY 82601 | Oil & Gas Operator | Jan 2015 |
| 33 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 34 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 35 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Oct 2025 |
| 36 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 37 | Edge Energy II LLC | Golden, CO 80401 | Oil & Gas Operator | Nov 2025 |
| 38 | Elk Energy Corporation | Denver, CO 80218 | Oil & Gas Operator | Mar 2008 |
| 39 | Eme Wyoming LLC | Lakewood, CO 80401 | Oil & Gas Operator | Oct 2025 |
| 40 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Sep 2025 |
| 41 | Energy Search Company Inc | Aurora, CO 80011 | Oil & Gas Operator | Jun 2021 |
| 42 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 43 | EOG Y Resources Inc | Artesia, NM 88210 | Oil & Gas Operator | Feb 2019 |
| 44 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 45 | Evertson Operating Company Inc | Kimball, NE 69145 | Oil & Gas Operator | Nov 2022 |
| 46 | Extraction Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 47 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 48 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Aug 2025 |
| 49 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Nov 2025 |
| 50 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Dec 2025 |
| 51 | Five States Operating Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Oct 2025 |
| 52 | Forcenergy Onshore Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 53 | Foundation Energy Managment LLC | Addison, TX 74119 | Oil & Gas Operator | Oct 2025 |
| 54 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 55 | Great Western Resources Inc | | Oil & Gas Operator | Dec 1989 |
| 56 | Gross Todd | Pine Bluffs, WY 82082 | Oil & Gas Operator | Mar 2007 |
| 57 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 58 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 59 | Haug Lawrence | Kimball, NE 69145 | Oil & Gas Operator | Jul 2007 |
| 60 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 61 | Helis Oil & Gas Company LLC Estate | New Orleans, LA 70130 | Oil & Gas Operator | Jul 2022 |
| 62 | Hesperus Energy II LLC | | Oil Operator | Aug 2025 |
| 63 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Dec 2025 |
| 64 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 65 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |
| 66 | Incremental Oil & Gas USA Holdings Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2021 |
| 67 | Independent Production Company | Greenwood VIllage, CO 80121 | Oil & Gas Operator | May 2003 |
| 68 | Kachina Exploration Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2000 |
| 69 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 70 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Aug 2025 |
| 71 | L & B Oil Company Inc | Houston, TX 77019-3115 | Oil & Gas Operator | Mar 2025 |
| 72 | Lear Petroleum Exploration | | Oil & Gas Operator | Jul 2013 |
| 73 | Liberty Production Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1994 |
| 74 | Lilis Energy Inc | Denver, CO 80203 | Oil & Gas Operator | Aug 2017 |
| 75 | Lone Star Land And Energy II LLC | Dallas, TX 75214 | Oil & Gas Operator | Jan 2020 |
| 76 | Longs Peak Resources LLC | Houston, TX 77019 | Oil & Gas Operator | Oct 2025 |
| 77 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 78 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 79 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 80 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Oct 2025 |
| 81 | Nanke Energy LLC | Westminster, CO 80234 | Oil & Gas Operator | Oct 2025 |
| 82 | Newwoods Petroleum LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2016 |
| 83 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 84 | North Silo Resources LLC | Houston, TX 77055 | Oil & Gas Operator | Oct 2025 |
| 85 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 86 | Open Range Energy LLC | Jones, OK 73049-8744 | Oil & Gas Operator | Mar 2025 |
| 87 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 88 | Pal LLC | Gillette, WY 82718 | Oil Operator | Dec 2019 |
| 89 | Paladin Energy Partner LLC | Denver, CO 80201 | Oil & Gas Operator | Aug 2006 |
| 90 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 91 | Pease Oil & Gas Company | Grand Junction, CO 81506 | Oil & Gas Operator | May 2000 |
| 92 | Petcon Associates LTD | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 93 | Peters Walter J | | Oil & Gas Operator | Jul 1991 |
| 94 | Peterson Energy Management Inc | | Oil Operator | Aug 2010 |
| 95 | Peterson Energy Operating Inc | Loveland, CO 80537 | Oil & Gas Operator | Oct 2025 |
| 96 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 97 | Petroleum Management LLC | Platteville, CO 80651 | Oil & Gas Operator | Mar 2011 |
| 98 | Phoenix Operating LLC | Denver, CO 80237 | Oil & Gas Operator | Oct 2025 |
| 99 | Pivonka Investments LLC | | Oil & Gas Operator | Oct 2025 |
| 100 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |