| 1 | Alpha Energy LLC | Ashland, OR 97520 | Oil & Gas Operator | Dec 2024 |
| 2 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 3 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 4 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 5 | Anschutz Corporation, The | Denver, CO 80202 | Oil & Gas Operator | Sep 2016 |
| 6 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 7 | Apollo 17 Oil And Gas Inc | | Oil Operator | Feb 1988 |
| 8 | Arapaho Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Nov 1998 |
| 9 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 10 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Jan 2025 |
| 11 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 12 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 13 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 14 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 15 | Bullock A O | Casper, WY 82604 | Oil & Gas Operator | Jan 2025 |
| 16 | Bunkirt J J Oil & Gas Corporation | Powell, WY 82435 | Oil & Gas Operator | Feb 2025 |
| 17 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 18 | Capitol Oil & Gas Corporation | Centennial, WY 82055 | Oil Operator | Feb 2006 |
| 19 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 20 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Jan 2025 |
| 21 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 22 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 23 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 24 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 25 | Cline Production Company | Billings, MT 59104 | Oil & Gas Operator | Dec 2024 |
| 26 | Coastal Chem Inc | Midvale, UT 84047 | Oil & Gas Operator | Aug 2003 |
| 27 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 28 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Jan 2025 |
| 29 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 30 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Mar 2025 |
| 31 | Coronado Oil Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 32 | Cumberland Operating LLC | Cody, WY 82414 | Oil & Gas Operator | Jan 2025 |
| 33 | D90 Energy, LLC | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 34 | Davis Oil Company | Pawhuska, OK 74056 | Oil & Gas Operator | Jun 2018 |
| 35 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 36 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 37 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jan 2025 |
| 38 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2025 |
| 39 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 40 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 41 | Energy Operating Company Inc | Lakewood, CO 80235 | Oil & Gas Operator | Dec 2012 |
| 42 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 43 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 44 | Exeter Drilling Company | Denver, CO 80217 | Oil & Gas Operator | Sep 1997 |
| 45 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 46 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 47 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Jan 2025 |
| 48 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Feb 2025 |
| 49 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 50 | Fruehauf LLC | Gaylord, MI 49735 | Oil Operator | Feb 2005 |
| 51 | Gas Ventures LLC | Thermopolis, WY 82443 | Oil & Gas Operator | Oct 2020 |
| 52 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 53 | Goldmark Engineering Inc | Casper, WY 82602 | Oil & Gas Operator | Oct 2004 |
| 54 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 55 | Granite Creek Energy LLC | Cody, WY 82414 | Oil & Gas Operator | Jan 2025 |
| 56 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jan 2025 |
| 57 | Hawks Industries Inc | Casper, WY 82601 | Oil & Gas Operator | Jun 1993 |
| 58 | Herbaly Petroleum Corp | FT Worth, TX 76102 | Oil & Gas Operator | Feb 2002 |
| 59 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 60 | Hondo Oil & Gas | Houston, TX 77042 | Oil & Gas Operator | Oct 1995 |
| 61 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 62 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 63 | Husky Oil Company | Cody, WY 82414 | Oil & Gas Operator | Dec 1984 |
| 64 | Incline Reserves Inc | Topeka, KS BAD ADDR | Oil & Gas Operator | Mar 1994 |
| 65 | Incremental Oil & Gas USA Holdings Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2021 |
| 66 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Mar 2025 |
| 67 | JN Exploration & Prod | Billings, MT 59103-0159 | Oil & Gas Operator | Apr 2001 |
| 68 | Katherman Vance E | Casper, WY 82601 | Oil Operator | Dec 2004 |
| 69 | KCS Mountain Resources Inc | Manderson, WY 82432 | Oil & Gas Operator | Nov 2006 |
| 70 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 71 | Kirkwood W C | Casper, WY 82602 | Oil & Gas Operator | May 2005 |
| 72 | Legacy Energy Inc | Carpinteria, CA 93013 | Oil & Gas Operator | Jun 2012 |
| 73 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 74 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 75 | Lissolo J W | Yuma, AZ 85365 | Oil & Gas Operator | Feb 2017 |
| 76 | Long Beach Oil Development Co | Glendale, CA 91203 | Oil & Gas Operator | Jun 2004 |
| 77 | Low D J | Littleton, CO 80127 | Oil Operator | Dec 1999 |
| 78 | M & K Oil Company LLC | Gillette, WY 82716 | Oil & Gas Operator | Jan 2025 |
| 79 | M & K Oil Operations | | Oil & Gas Operator | Sep 1994 |
| 80 | M W Petroleum Company | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 81 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 82 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 83 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 84 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 85 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 86 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 87 | Natural Gas Processing Company | Worland, WY 82401 | Oil & Gas Operator | Feb 2025 |
| 88 | Nepeco | Byron, WY 82412 | Oil Operator | Jan 2025 |
| 89 | Omni Operating Company | Osage, WY 82723 | Oil & Gas Operator | Sep 2001 |
| 90 | Oneida Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2003 |
| 91 | Ott Inc | Casper, WY 82602 | Oil Operator | Dec 2024 |
| 92 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 93 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 94 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 95 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 96 | Pedry J J | | Oil Operator | Sep 1989 |
| 97 | Petra Petroleum Inc | Littleton, CO 80160-0319 | Oil & Gas Operator | Jun 2005 |
| 98 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 99 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 100 | Phoenix Production Company | Cody, WY 82414-3607 | Oil & Gas Operator | Oct 2023 |