| 1 | Altex Oil Company | Breckenridge, CO 80424 | Oil & Gas Operator | Dec 2005 |
| 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 2024 |
| 4 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2024 |
| 5 | Angus Petroleum Corporation | Chicago, IL 60660 | Oil & Gas Operator | Dec 2022 |
| 6 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 7 | Anschutz Oil Company LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2020 |
| 8 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 9 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 10 | Arjay Oil Company | Salt Lake City, UT 84110 | Oil & Gas Operator | May 2000 |
| 11 | Atomic Oil & Gas LLC | Lakewood, CO 80228 | Oil & Gas Operator | Dec 2012 |
| 12 | Atx Energy Partners LLC | Austin, TX 78716 | Oil & Gas Operator | Oct 2024 |
| 13 | Axiom Energy LLC | Park City, UT 84098 | Oil Operator | Feb 2010 |
| 14 | Aztec Gas And Oil Corporation | Elephant Butte, NM 87935-0370 | Oil & Gas Operator | Mar 2005 |
| 15 | Banding M R Inc | Gillette, WY 82717 | Oil & Gas Operator | Nov 2024 |
| 16 | Barn Owls LLC | | Oil & Gas Operator | Oct 2024 |
| 17 | Bearcat Energy LLC (Colorado) | Denver, CO 80202 | Oil & Gas Operator | May 2022 |
| 18 | Berco Resources LLC | Denver, CO 80206 | Oil & Gas Operator | Sep 2009 |
| 19 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Nov 2024 |
| 20 | Big Chief Exploration | Palisades, CO 81526 | Oil & Gas Operator | Oct 1993 |
| 21 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 22 | Bird Oil Corporation | | Oil & Gas Operator | Jul 1992 |
| 23 | Black Diamond Energy Inc | Pittsburgh, PA 15237 | Gas Operator | May 2016 |
| 24 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | May 2018 |
| 25 | Blackjack Oil, Inc. | Las Vegas, NV 89128 | Oil & Gas Operator | Nov 2019 |
| 26 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 27 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 28 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 29 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2024 |
| 30 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 31 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2024 |
| 32 | Carbon Creek Energy LLC | Sheridan, WY 82801 | Oil & Gas Operator | Oct 2024 |
| 33 | CH4 Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2006 |
| 34 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Nov 2024 |
| 35 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 36 | Chipcore LLC | Casper, WY 82601 | Oil & Gas Operator | Oct 2024 |
| 37 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Dec 2024 |
| 38 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Oct 2024 |
| 39 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 40 | Comet Energy Services LLC | Traverse City, MI 49686 | Oil & Gas Operator | Oct 2011 |
| 41 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 42 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 43 | Contango Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 44 | Continental Production Co LLC | Greenwood VIllage, CO 80155 | Oil & Gas Operator | Aug 2012 |
| 45 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2024 |
| 46 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Oct 2024 |
| 47 | Davey Corporation | Golden, CO 80401 | Oil & Gas Operator | Nov 2024 |
| 48 | Davis Oil Company | Pawhuska, OK 74056 | Oil & Gas Operator | Jun 2018 |
| 49 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Dec 2024 |
| 50 | DCD Inc | Gillette, WY 82716 | Oil & Gas Operator | Aug 2003 |
| 51 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2024 |
| 52 | Deuel Arch W | | Oil & Gas Operator | Aug 1995 |
| 53 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 54 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 55 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | Oct 2024 |
| 56 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 57 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 58 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Sep 2024 |
| 59 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 60 | Enerex Limited Liability Co | Craig, CO 81625 | Oil & Gas Operator | Jun 2024 |
| 61 | Energetics Inc | Englewood, CO 80155 | Oil & Gas Operator | Aug 1985 |
| 62 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 63 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 64 | EOG Y Resources Inc | Artesia, NM 88210 | Oil & Gas Operator | Feb 2019 |
| 65 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 66 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 67 | Falcon Creek Resources, Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Apr 2001 |
| 68 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | Dec 2024 |
| 69 | Federated Oil & Gas Properties | Traverse City, MI 49685 | Gas Operator | Mar 2014 |
| 70 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Nov 2024 |
| 71 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 72 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 73 | Gibbs William | | Oil Operator | Feb 2000 |
| 74 | Gilmore Oil & Gas | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 75 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2024 |
| 76 | Hershey Oil Corporation | Seminole, TX 79360 | Oil & Gas Operator | Jul 1992 |
| 77 | High Plains Gas LLC | Gillette, WY 82717 | Gas Operator | Aug 2014 |
| 78 | Highland Exploration | | Oil Operator | Sep 1979 |
| 79 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 80 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Dec 2024 |
| 81 | Hot Springs Resources LTD | Casper, WY 82601 | Oil Operator | Dec 2014 |
| 82 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2024 |
| 83 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 84 | Independent Production Company | Greenwood VIllage, CO 80121 | Oil & Gas Operator | May 2003 |
| 85 | Integrity Oil & Gas | Golden, CO 80401 | Oil & Gas Operator | May 2011 |
| 86 | Jayne Morton Living Trust | Troup, TX 75789 | Oil Operator | Jul 2023 |
| 87 | Jims Water Service Inc | Gillette, WY 82717 | Oil & Gas Operator | Oct 2016 |
| 88 | JN Exploration & Prod | Billings, MT 59103-0159 | Oil & Gas Operator | Apr 2001 |
| 89 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2024 |
| 90 | Kase Energy LLC | Roseville, MN 55113 | Oil Operator | Aug 2006 |
| 91 | Kennedy Oil | Gillette, WY 82716 | Oil & Gas Operator | Oct 2024 |
| 92 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jun 2024 |
| 93 | KLT Gas Inc | Woodlands, TX 77380 | Oil & Gas Operator | Sep 2004 |
| 94 | Lance Oil & Gas Company Inc | Kirtland, NM 87417 | Oil & Gas Operator | Mar 2013 |
| 95 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2024 |
| 96 | Loil Oil LLC | Golden, CO 80402 | Oil & Gas Operator | Oct 2024 |
| 97 | Loundagin N B | Casper, WY 82602 | Oil & Gas Operator | Sep 2015 |
| 98 | M K M Oil Company | Casper, WY 82602 | Oil & Gas Operator | Jun 1996 |
| 99 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 100 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |