| 101 | Julander Energy Company | Denver, CO 80614 | Oil Operator | Apr 2016 |
| 102 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 103 | Kamco Limited | Salt Lake City, UT 84105 | Oil Operator | Sep 2016 |
| 104 | KCS Mountain Resources Inc | Manderson, WY 82432 | Oil & Gas Operator | Nov 2006 |
| 105 | Kemmerer Coal Co | | Oil & Gas Operator | Dec 1981 |
| 106 | Kennedy & Mitchell | Woodward, OK 73802 | Oil & Gas Operator | Dec 1988 |
| 107 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 108 | L & J Operating Inc | Gillette, WY 82718 | Oil & Gas Operator | Aug 2016 |
| 109 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jul 2025 |
| 110 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 111 | Lewis & Clark Exploration | | Oil Operator | Feb 1989 |
| 112 | Lincero LLC | Sinclair, WY 82334 | Oil Operator | Jun 2025 |
| 113 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 114 | Lodestone Operating | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 115 | Loil Oil LLC | Golden, CO 80402 | Oil & Gas Operator | May 2025 |
| 116 | Luff Exploration | Denver, CO 80203 | Oil & Gas Operator | Dec 2006 |
| 117 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 118 | McCulliss Resource Company Inc | Denver, CO 80202 | Oil & Gas Operator | Jun 1999 |
| 119 | McKenzie Production Company | Houston, TX 77063 | Oil & Gas Operator | May 1995 |
| 120 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 121 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 122 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 123 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 124 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 125 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 126 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 127 | Mingo Oil Producers | Salt Lake City, UT 84111 | Oil & Gas Operator | Nov 1987 |
| 128 | Mobil Expl & Producing North America Inc | | Oil & Gas Operator | Nov 1986 |
| 129 | Moss Properties Inc | | Oil & Gas Operator | Mar 1986 |
| 130 | MRD Operating LLC (Delaware) | Houston, TX 77010 | Oil & Gas Operator | Jul 2015 |
| 131 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 132 | Mustang Resources LLC | Houston, TX 77256 | Oil & Gas Operator | May 2025 |
| 133 | Nadel And Gussman Rockies, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2012 |
| 134 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 135 | Natural Gas Corp Of California | Vernal, UT 84078 | Oil & Gas Operator | Dec 1989 |
| 136 | Natural Gas Processing Company | Worland, WY 82401 | Oil & Gas Operator | Jun 2025 |
| 137 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Jul 2025 |
| 138 | North Finn LLC | Casper, WY 82605 | Oil & Gas Operator | Jun 2025 |
| 139 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 140 | Olympic Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2004 |
| 141 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 142 | Overland Resources LLC | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Jul 2019 |
| 143 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 144 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 145 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 146 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 147 | Pacific Transmission Supply | | Oil & Gas Operator | Dec 1987 |
| 148 | PDS Resources LLC | | Oil & Gas Operator | Apr 2025 |
| 149 | Pedco Resources Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2008 |
| 150 | Petcon Associates LTD | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 151 | Petro Search Exploration Corp | | Oil & Gas Operator | May 1993 |
| 152 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 153 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 154 | Petroleum Corp Of Delaware The | | Oil & Gas Operator | May 1991 |
| 155 | Petroleum Resource Management Corp | Denver, CO 80203 | Oil & Gas Operator | Jun 2025 |
| 156 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 157 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 158 | Polfam Exploration Co | Denver, CO 80204 | Oil & Gas Operator | Mar 2007 |
| 159 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 160 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 161 | Rainbow Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 162 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Jun 2025 |
| 163 | Rangeview Resources Operating Co | | Oil & Gas Operator | May 2025 |
| 164 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | Jul 2025 |
| 165 | Resolute Wyoming Inc | Denver, CO 80203 | Oil & Gas Operator | May 2018 |
| 166 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 167 | Richardson Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 168 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Jun 2025 |
| 169 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 170 | Rock River Operating Inc | Laramie, WY 82070 | Oil & Gas Operator | Apr 2025 |
| 171 | Ronadero Company Inc | Roswell, NM BAD ADDR | Oil & Gas Operator | Dec 1996 |
| 172 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 173 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Jul 2025 |
| 174 | Samson Resources Company LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2021 |
| 175 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | May 2025 |
| 176 | Sauer Bill Oil & Gas Company LLC | Casper, WY 82604 | Oil & Gas Operator | Jun 1999 |
| 177 | Skidgel Enterprises Inc | Rawlins, WY 82301 | Oil & Gas Operator | Sep 2018 |
| 178 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Jul 2025 |
| 179 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 180 | Solar Petroleum Inc | | Oil Operator | May 1983 |
| 181 | Sonoma Energy Corporation | Park City, UT 84068 | Oil & Gas Operator | Feb 2010 |
| 182 | Sourcegas Energy Services Co | Golden, CO 80401 | Gas Operator | Jun 2015 |
| 183 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 184 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 185 | Southland Royalty Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2021 |
| 186 | Stone & Wolf LLC | Sheridan, WY 82801 | Oil & Gas Operator | Dec 2006 |
| 187 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Apr 2025 |
| 188 | Survivor Oil Inc | Tulsa, OK 74133 | Oil & Gas Operator | Sep 2007 |
| 189 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 190 | Tap Management Inc | Austin, TX 78757 | Oil & Gas Operator | Jan 2023 |
| 191 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 192 | Tbi Production Company | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2004 |
| 193 | Teocali Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 194 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 195 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 196 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Jul 2025 |
| 197 | Ticony Inc | | Oil & Gas Operator | Dec 1989 |
| 198 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Dec 2024 |
| 199 | Timberline Production Company LLC | Casper, WY 82601 | Oil & Gas Operator | Oct 2020 |
| 200 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |