| 101 | Oasis Petroleum North America LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 102 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 103 | Pan American Petroleum Corp | | Oil & Gas Operator | Nov 1988 |
| 104 | Paul Rankin Inc. | | Oil & Gas Operator | Oct 2025 |
| 105 | PDC Corporation | | Oil & Gas Operator | Jan 2011 |
| 106 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 107 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 108 | Phoenix Operating LLC | Denver, CO 80237 | Oil & Gas Operator | Oct 2025 |
| 109 | Phoenix Petroleum, LLC | | Oil & Gas Operator | Oct 2025 |
| 110 | Pintail Petroleum Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jun 2010 |
| 111 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 112 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 113 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 114 | Prairie Production, Inc. | | Oil & Gas Operator | Apr 2020 |
| 115 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |
| 116 | Primewest Petroleum Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jan 2009 |
| 117 | Prospective Investment & Trading Co., LTD. | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 118 | Proven Petroleum, Inc. | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 119 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Aug 2025 |
| 120 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Oct 2025 |
| 121 | RDT Properties, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2012 |
| 122 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 123 | Ritter, Laber & Associates, Inc. | Williston, ND 58802 | Oil & Gas Operator | Aug 2025 |
| 124 | Ronald M. Sannes | | Oil & Gas Operator | Oct 2016 |
| 125 | Ryan Exploration, Inc. | | Oil & Gas Operator | Mar 2012 |
| 126 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Dec 2025 |
| 127 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 128 | Samson Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 129 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 130 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 131 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 132 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 133 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Sep 2025 |
| 134 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 135 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 136 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 137 | St Oil Company | Denver, CO 80264-2101 | Oil & Gas Operator | Dec 2010 |
| 138 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 139 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 140 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 141 | Stearns Oil Company LLC | Willison, ND 58801 | Oil & Gas Operator | Oct 2025 |
| 142 | Stephens Williston, LLC Dba Seg Williston, LLC | | Oil & Gas Operator | Oct 2025 |
| 143 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 144 | Sun Exploration And Production Co | | Oil & Gas Operator | Jan 1990 |
| 145 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 146 | T-Boc Inc. | | Oil & Gas Operator | Apr 2016 |
| 147 | Taqa USA, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jul 2020 |
| 148 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 149 | Texakota, Inc. | Houston, TX 77098 | Oil & Gas Operator | Mar 2021 |
| 150 | Texas Gas Exploration Corp. | | Oil & Gas Operator | Nov 1986 |
| 151 | Tracker Resource Development II, LLC | | Oil & Gas Operator | Feb 2011 |
| 152 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 153 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 154 | Triangle USA Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2021 |
| 155 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 156 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 157 | Versa Operating LLC | | Oil & Gas Operator | May 2022 |
| 158 | W. H. Hunt Trust Estate | | Oil & Gas Operator | Mar 1997 |
| 159 | Ward-Williston Company | | Oil & Gas Operator | Apr 2014 |
| 160 | Wesco Operating Inc | Casper, WY 82602 | Oil & Gas Operator | Oct 2025 |
| 161 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 162 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 163 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 164 | William Herbert Hunt | | Oil & Gas Operator | Mar 1986 |
| 165 | Williston Industrial Supply Corporation | Williston, ND 58801 | Oil & Gas Operator | Mar 2012 |
| 166 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 167 | Zavanna, LLC | | Oil & Gas Operator | Oct 2025 |
| 168 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2025 |
| 169 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |