| 1 | 1876 Resources LLC | Highlands Ranch, CO 80129 | Oil & Gas Operator | May 2026 |
| 2 | Balidor Oil & Gas LLC | Houston, TX 77070 | Oil & Gas Operator | Oct 2021 |
| 3 | Baytex Energy USA LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2014 |
| 4 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 5 | BHP Petroleum (USA) Inc | | Oil & Gas Operator | Mar 1993 |
| 6 | Black Bear Oil Corporation | Las Vegas, NV 89128 | Oil & Gas Operator | May 2026 |
| 7 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | Mar 2018 |
| 8 | Boggy Creek Production | Newcastle, WY 82701 | Oil & Gas Operator | Apr 2012 |
| 9 | Bradley Jr Jack C | Casper, WY 82601 | Oil & Gas Operator | Apr 2009 |
| 10 | Bradley SR Jack C | Newcastle, WY 82701 | Oil Operator | Jun 2010 |
| 11 | Breitburn Operating LP | Keithville, LA 71047 | Oil & Gas Operator | Jul 2026 |
| 12 | Brent Exploration | | Oil & Gas Operator | Dec 1993 |
| 13 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 14 | Brown & Bickerstaff | | Oil & Gas Operator | Oct 1991 |
| 15 | Buck Creek Freight Inc | Lusk, WY 82225 | Oil Operator | Jun 2026 |
| 16 | Bullock A O | Casper, WY 82604 | Oil & Gas Operator | Apr 2026 |
| 17 | Bullock Gladys C Trust | | Oil & Gas Operator | Dec 1999 |
| 18 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 19 | BW Oil LLC | Hamel, MN 55340 | Oil Operator | Jun 2015 |
| 20 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 21 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 22 | Castle Rock Oil LLC | | Oil Operator | May 2026 |
| 23 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 24 | Century Oil And Gas LLC | Katy, TX 77494 | Oil & Gas Operator | May 2026 |
| 25 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 26 | Cherokee Oil Production Inc | Wichita, KS 67230 | Oil & Gas Operator | Jan 1997 |
| 27 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2026 |
| 28 | Cheyenne River LLC | Dallas, TX 75204 | Oil & Gas Operator | Nov 2018 |
| 29 | Chipcore LLC | Casper, WY 82601 | Oil & Gas Operator | May 2026 |
| 30 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 31 | Cinco Natural Resources Corp | La Grange, TX 78945 | Oil & Gas Operator | Jul 2026 |
| 32 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Jul 2026 |
| 33 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2026 |
| 34 | Common Energy Inc | Douglas, WY 82633 | Oil & Gas Operator | Aug 1995 |
| 35 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 36 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Mar 2026 |
| 37 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 38 | Darrah John Jay Jr | Wichita, KS 67201 | Oil & Gas Operator | May 2026 |
| 39 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 40 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Jul 2026 |
| 41 | Dekalb Energy Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 1996 |
| 42 | Deuel Arch W | | Oil & Gas Operator | Aug 1995 |
| 43 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2026 |
| 44 | Discovery Oil LTD | Los Angeles, CA 90067 | Oil & Gas Operator | Jan 1993 |
| 45 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2026 |
| 46 | Dol Resources Inc | Rowlett, TX 75088 | Oil & Gas Operator | Apr 2026 |
| 47 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 48 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 49 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 50 | Ellwood Exploration LLC | San Antonio, TX 78217 | Oil Operator | May 2026 |
| 51 | Empire Petroleum Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Dec 2005 |
| 52 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Jul 2025 |
| 53 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 54 | EOG Y Resources Inc | Artesia, NM 88210 | Oil & Gas Operator | Feb 2019 |
| 55 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 56 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 57 | Evergreen Operating Company | Denver, CO 80202 | Oil & Gas Operator | Apr 1996 |
| 58 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2026 |
| 59 | Fancher Oil LLC | Greenwood, CO 80111 | Oil & Gas Operator | Nov 2006 |
| 60 | Farnsworth & Kaiser Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Sep 2012 |
| 61 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Jul 2026 |
| 62 | Flag-Redfern Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2002 |
| 63 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 64 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 65 | Fossil Creek Resources LLC | Arlington, TX 76011-5597 | Oil & Gas Operator | Mar 2015 |
| 66 | Fossil Energy Inc | Austin, TX 78746 | Oil & Gas Operator | Jul 2026 |
| 67 | Hadley/Jackson Energy LLC | Lake Forest, IL 60045 | Oil & Gas Operator | May 2026 |
| 68 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Mar 2026 |
| 69 | Hedges Spencer | Casper, WY 82604 | Oil Operator | Mar 2024 |
| 70 | Hoff Elmer & Mildred | | Oil & Gas Operator | Jan 1991 |
| 71 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Jul 2026 |
| 72 | Hondo Oil & Gas | Houston, TX 77042 | Oil & Gas Operator | Oct 1995 |
| 73 | Jims Water Service Inc | Gillette, WY 82717 | Oil & Gas Operator | Oct 2016 |
| 74 | Joemar Wyoming Operating LLC | | Oil & Gas Operator | May 2026 |
| 75 | JP Oil Wyoming LLC | Lafayette, LA 70505 | Oil & Gas Operator | Jun 2026 |
| 76 | Juniper Petroleum Corporation | | Oil & Gas Operator | Aug 1983 |
| 77 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2026 |
| 78 | Kant Walter F | Lance Creek, WY 82222 | Oil & Gas Operator | Dec 2002 |
| 79 | Kedco Management Corp | | Oil & Gas Operator | Jul 1985 |
| 80 | Kenai Oil & Gas Inc | | Oil & Gas Operator | Jun 1987 |
| 81 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 82 | Kirkwood W C | Casper, WY 82602 | Oil & Gas Operator | May 2005 |
| 83 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 84 | Krejci Harry L | | Oil & Gas Operator | Apr 2026 |
| 85 | L & J Operating Inc | Gillette, WY 82718 | Oil & Gas Operator | Aug 2016 |
| 86 | L R Company | Casper, WY 82602 | Oil & Gas Operator | Sep 2007 |
| 87 | Lear Petroleum Exploration | | Oil & Gas Operator | Jul 2013 |
| 88 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 89 | Lusk Operating LLC | Denver, CO 80202 | Oil Operator | Jun 2017 |
| 90 | M & K Oil Company LLC | Gillette, WY 82716 | Oil & Gas Operator | May 2026 |
| 91 | Manewal Bradley Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2013 |
| 92 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 93 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | May 2026 |
| 94 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2026 |
| 95 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 96 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 97 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 98 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2026 |
| 99 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 100 | Millennium Oil & Gas LLC | Denver, CO 80203 | Oil & Gas Operator | Oct 2025 |