| 1 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2026 |
| 2 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 3 | Andrikopoulos A G | Cheyenne, WY 82009 | Oil & Gas Operator | Dec 1994 |
| 4 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 5 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 6 | Anschutz Pinedale Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2015 |
| 7 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Mar 2026 |
| 8 | Bce-Mach LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2026 |
| 9 | Berco Resources LLC | Denver, CO 80206 | Oil & Gas Operator | Sep 2009 |
| 10 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 11 | Big Piney Oil & Gas Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 1992 |
| 12 | Black Diamond Energy Of Delaware Inc | Buffalo, WY 82834 | Oil & Gas Operator | Jan 2026 |
| 13 | Blue Spruce Operating LLC | Pinedale, WY 82941 | Oil & Gas Operator | Jan 2026 |
| 14 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 15 | Breitburn Operating LP | Keithville, LA 71047 | Oil & Gas Operator | Mar 2026 |
| 16 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 17 | Buffalo Resources LLC | Woodward, OK 73801 | Oil & Gas Operator | Aug 2025 |
| 18 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 19 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 20 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 21 | Caerus Northern Rockies LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2021 |
| 22 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 23 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 24 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 25 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2026 |
| 26 | Christmann John J | Lubbock, TX 79401 | Oil & Gas Operator | Dec 1994 |
| 27 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Mar 2026 |
| 28 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 29 | Coronado Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 30 | Crown Energy Partners LLC | Englewood, CO 80112 | Oil & Gas Operator | Sep 2013 |
| 31 | Crown Oil & Gas Co Inc | Labarge, WY 83123 | Oil & Gas Operator | Jan 2023 |
| 32 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 33 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2026 |
| 34 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2026 |
| 35 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 36 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | Jan 2026 |
| 37 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 38 | FMC Corporation | Green River, WY 82935 | Oil & Gas Operator | Dec 2008 |
| 39 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 40 | Foundation Energy Managment LLC | Addison, TX 74119 | Oil & Gas Operator | Nov 2025 |
| 41 | G & H Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2009 |
| 42 | Gasco Production Company | Denver, CO 80237 | Oil & Gas Operator | Dec 2015 |
| 43 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 44 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 45 | Gpo Operations LLC | Labarge, WY 83123 | Oil & Gas Operator | Dec 2025 |
| 46 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 47 | Greylock Production LLC | Charleston, WV 25311-1264 | Oil & Gas Operator | Jan 2026 |
| 48 | Grynberg Petroleum Company | Greenwood Vge, CO 80111-3326 | Oil & Gas Operator | Oct 2019 |
| 49 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 50 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 51 | Hay Leonard | Rock Springs, WY 82901 | Oil & Gas Operator | Sep 1994 |
| 52 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Mar 2026 |
| 53 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2026 |
| 54 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2002 |
| 55 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2026 |
| 56 | Husky Oil Company | Cody, WY 82414 | Oil & Gas Operator | Dec 1984 |
| 57 | Infinity Oil & Gas Of Wyoming | Rock Springs, WY 82902 | Oil & Gas Operator | Feb 2009 |
| 58 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 59 | Itr Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 60 | KC Well Service | Big Piney, WY 83113 | Gas Operator | Jan 2026 |
| 61 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 62 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 63 | Labarge Minerals Inc | Labarge, WY 83123 | Oil & Gas Operator | Jan 2020 |
| 64 | Lance Oil & Gas Company Inc | Kirtland, NM 87417 | Oil & Gas Operator | Mar 2013 |
| 65 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 66 | Linn Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 67 | Lodestone Operating | Portland, TX 78374 | Oil & Gas Operator | Oct 2025 |
| 68 | M & G Oil And Gas Inc | Llabarge, WY 83123 | Oil & Gas Operator | Apr 2023 |
| 69 | M W Petroleum Company | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 70 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Jan 2026 |
| 71 | McCulliss Resource Company Inc | Denver, CO 80202 | Oil & Gas Operator | Jun 1999 |
| 72 | McMurry Energy Company | | Oil & Gas Operator | Dec 2001 |
| 73 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 74 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2026 |
| 75 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 76 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 77 | Mountain Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Apr 2013 |
| 78 | MRD Operating LLC (Delaware) | Houston, TX 77010 | Oil & Gas Operator | Jul 2015 |
| 79 | Mustang Resources LLC | Houston, TX 77046 | Oil & Gas Operator | Jan 2026 |
| 80 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 81 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 82 | Natural Gas Corp Of California | Vernal, UT 84078 | Oil & Gas Operator | Dec 1989 |
| 83 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 84 | Nextraction Energy Us Inc | Las Vegas, NV 89169 | Oil & Gas Operator | Feb 2018 |
| 85 | Nielson & Associates, Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 86 | Northstar Operating Company Of Texas | Midland, TX 79702 | Oil & Gas Operator | Feb 2008 |
| 87 | Omimex Petroleum Inc (De) | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2020 |
| 88 | Orion Energy Partners LP | Denver, CO 80202 | Oil & Gas Operator | Nov 2010 |
| 89 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 90 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Mar 2026 |
| 91 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2026 |
| 92 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 93 | Pacific Transmission Supply | | Oil & Gas Operator | Dec 1987 |
| 94 | Petro Search Exploration Corp | | Oil & Gas Operator | May 1993 |
| 95 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 96 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 97 | Pinedale Energy Partners Operating LLC | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2021 |
| 98 | Pinedale Investment Inc | Pinedale, WY 82941 | Oil & Gas Operator | Jan 2026 |
| 99 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Sep 2025 |
| 100 | Pride Energy Company An Oklahoma GP | Tulsa, OK 74170 | Oil & Gas Operator | Jan 2026 |