| 1 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 2 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Jul 2026 |
| 3 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 4 | Bower Properties LLC | Worland, WY 82401 | Oil & Gas Operator | Aug 2005 |
| 5 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2026 |
| 6 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 7 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2026 |
| 8 | Brehm Investment Group Inc | | Oil Operator | Jul 1991 |
| 9 | Brehm Oil | MT. Vernon, IL 62864 | Oil Operator | Jan 1986 |
| 10 | Brent Exploration | | Oil & Gas Operator | Dec 1993 |
| 11 | Bronco Oil & Gas Co | Casper, WY 82602 | Oil & Gas Operator | Oct 1987 |
| 12 | Bunkirt J J Oil & Gas Corporation | Powell, WY 82435 | Oil & Gas Operator | Jul 2026 |
| 13 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 14 | C & K Petroleum | | Oil & Gas Operator | Jan 1984 |
| 15 | Cat Oil | Byron, WY 82412 | Oil Operator | May 2001 |
| 16 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 17 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 18 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 19 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Sep 2026 |
| 20 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Jul 2026 |
| 21 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 22 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 23 | Crystal Exploration & Production Company | Shreveport, LA 71120 | Oil & Gas Operator | Feb 1995 |
| 24 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Sep 2026 |
| 25 | Dalen Resources Oil & Gas Co | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 26 | Davis Exploration | | Oil Operator | Dec 2007 |
| 27 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2026 |
| 28 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 29 | Dolezal George Jr | Littleton, CO 80163 | Oil & Gas Operator | Sep 2006 |
| 30 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 31 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 32 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 33 | Endeavor Energy LLC | | Oil Operator | Sep 2023 |
| 34 | Enstar Petroleum Inc | | Oil & Gas Operator | Apr 1985 |
| 35 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 36 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 37 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Jun 2026 |
| 38 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jun 2026 |
| 39 | Florida Gas Exploration Co | | Oil & Gas Operator | Feb 1985 |
| 40 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 41 | Gary-Williams Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2000 |
| 42 | Goldmark Engineering Inc | Casper, WY 82602 | Oil & Gas Operator | Oct 2004 |
| 43 | Granite Creek Energy LLC | Cody, WY 82414 | Oil & Gas Operator | Jul 2026 |
| 44 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jun 2016 |
| 45 | Great Western Drilling Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 46 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 47 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 48 | Hanson Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 49 | Holden Harold B | Billings, MT 59103 | Oil Operator | Jun 1996 |
| 50 | Hughes Oil Company Inc | Odessa, TX 79765 | Oil & Gas Operator | Feb 2004 |
| 51 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 52 | Husky Oil Company | Cody, WY 82414 | Oil & Gas Operator | Dec 1984 |
| 53 | Hyland Oil Corporation | | Oil & Gas Operator | Apr 1990 |
| 54 | Integrity Oil & Gas | Golden, CO 80401 | Oil & Gas Operator | May 2011 |
| 55 | Intoil, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2002 |
| 56 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Sep 2026 |
| 57 | Kaneb Oil & Gas | | Oil & Gas Operator | Oct 1987 |
| 58 | KCS Mountain Resources Inc | Manderson, WY 82432 | Oil & Gas Operator | Nov 2006 |
| 59 | Kentex Worland LLC | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 60 | Kentex Worland Operating Co LLC | | Oil & Gas Operator | Jun 2026 |
| 61 | Kirkwood W C | Casper, WY 82602 | Oil & Gas Operator | May 2005 |
| 62 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 63 | Koch Production Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2002 |
| 64 | L & R Drilling Company | Belle Fourche, SD 57717 | Oil & Gas Operator | Dec 1999 |
| 65 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Sep 2026 |
| 66 | Lissolo J W | Yuma, AZ 85365 | Oil & Gas Operator | Feb 2017 |
| 67 | M-3 Industries | Casper, WY 82602 | Oil & Gas Operator | Jun 2026 |
| 68 | Mapco Oil Company | | Oil & Gas Operator | Jan 1985 |
| 69 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Jun 2026 |
| 70 | McCulliss Resource Company Inc | Denver, CO 80202 | Oil & Gas Operator | Jun 1999 |
| 71 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 72 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Sep 2026 |
| 73 | Merit Productions | | Oil Operator | Sep 1996 |
| 74 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 75 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 76 | National Treasure Mines | San Marina, CA 91118 | Oil Operator | Dec 1998 |
| 77 | Natural Gas Processing Company | Worland, WY 82401 | Oil & Gas Operator | Jul 2026 |
| 78 | Nepeco | Byron, WY 82412 | Oil Operator | Jun 2026 |
| 79 | New Era Petroleum Inc | Sheridan, WY 82801 | Oil Operator | Jul 2026 |
| 80 | Newman Bros Drilling | | Oil & Gas Operator | Apr 2004 |
| 81 | Nielson & Associates, Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 82 | Nielson Capital Partners LLC | Cody, WY 82414 | Oil & Gas Operator | Dec 2014 |
| 83 | Nor-Am Exploration | | Oil Operator | Jun 1981 |
| 84 | Oxtex Inc | | Oil & Gas Operator | Oct 1989 |
| 85 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 86 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 87 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 88 | Pearce Leonard | Manderson, WY 82432 | Oil Operator | Dec 1999 |
| 89 | Pearce Mary | | Oil Operator | Dec 1999 |
| 90 | Pearce Oil Company | Manderson, WY 82432 | Oil Operator | Jun 1999 |
| 91 | Pedry J J | | Oil Operator | Sep 1989 |
| 92 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 93 | Phoenix Production Company | Cody, WY 82414-3607 | Oil & Gas Operator | Oct 2023 |
| 94 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 95 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 96 | Pride Energy Company An Oklahoma GP | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2026 |
| 97 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Jul 2026 |
| 98 | Provident Resources LTD | | Oil & Gas Operator | Dec 1986 |
| 99 | Red Rock Resources Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Jul 2026 |
| 100 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |