| 101 | Crown Petroleum Corp. | Oklahoma City, OK 73106 | Oil & Gas Operator | Sep 2026 |
| 102 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 103 | CWF Energy, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1997 |
| 104 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 105 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 106 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Sep 2026 |
| 107 | Dalf Energy LLC | Pampa, TX 79066 | Oil & Gas Operator | Sep 2026 |
| 108 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 109 | Daniels Energy | Pampa, TX 79066 | Oil & Gas Operator | Sep 2026 |
| 110 | Daniels, J.C. Energy | Pampa, TX 79066 | Oil & Gas Operator | Apr 2001 |
| 111 | Davenport, Vernon | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2008 |
| 112 | Davenport, Vernon Prod. Co. | Dumas, TX 79029 | Oil & Gas Operator | Jan 2002 |
| 113 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 114 | DDC Track, LLC | Bushland, TX 79012 | Oil Operator | Sep 2026 |
| 115 | Dee'S Oil | Wellington, TX 79095 | Oil & Gas Operator | Mar 2008 |
| 116 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2026 |
| 117 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 118 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2026 |
| 119 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 120 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Sep 2026 |
| 121 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 122 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 123 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Sep 2026 |
| 124 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 125 | Douglas, Norvel Trust | Hot Springs V, AR 71909 | Oil & Gas Operator | Aug 2013 |
| 126 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 127 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 128 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 129 | E. T. S. Enterprises, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jul 1996 |
| 130 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2026 |
| 131 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 132 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 133 | Ehvi Exploration LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 134 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 135 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 136 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jun 2026 |
| 137 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Sep 2026 |
| 138 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 139 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Apr 2026 |
| 140 | Enerquest Operating, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2026 |
| 141 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 142 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 143 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 144 | Eqv Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Sep 2026 |
| 145 | Estacado Energy, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 1999 |
| 146 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 147 | Etc Field Services LLC | Dallas, TX 75225 | Oil Operator | Jun 2018 |
| 148 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 149 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | May 2026 |
| 150 | Exxcel Production Company | Pampa, TX 79066 | Oil & Gas Operator | Sep 2026 |
| 151 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jan 2026 |
| 152 | Fairway Links Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2016 |
| 153 | Floyd Operating Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2004 |
| 154 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 155 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 156 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Sep 2026 |
| 157 | Fortay Inc. | Sunray, TX 79086 | Oil & Gas Operator | Sep 2026 |
| 158 | Fortune Natural Resources Corp. | Houston, TX 77067 | Oil & Gas Operator | Dec 2003 |
| 159 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Sep 2026 |
| 160 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Jun 2026 |
| 161 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 162 | Gaea Services, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2021 |
| 163 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 164 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 165 | Gifford Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Jul 2003 |
| 166 | Ginnings Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2025 |
| 167 | Golden Monet, Inc. | Bryan, TX 77805 | Oil & Gas Operator | Jul 2024 |
| 168 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 169 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 170 | Granite Operating Company | Houston, TX 77056 | Oil & Gas Operator | Nov 2012 |
| 171 | Grayrock Energy II, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2026 |
| 172 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 173 | Guest Petroleum Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 174 | Gunsmoke Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | May 2012 |
| 175 | H & L Operating Co., L.L.P. | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 176 | H & L Operating Co., LLC | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2021 |
| 177 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Sep 2026 |
| 178 | Hadaway Engineering Inc | Canadian, TX 79014 | Oil & Gas Operator | Jul 2015 |
| 179 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2026 |
| 180 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 181 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 182 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 183 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Sep 2026 |
| 184 | Hawkins Oil & Gas, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 185 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2026 |
| 186 | Helton, Pat A. & Alberta | Allison, TX 79003 | Oil & Gas Operator | Sep 2026 |
| 187 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 188 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Sep 2026 |
| 189 | Herrmann, S. W. Oil & Gas | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2026 |
| 190 | HGN Operating Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 191 | Hicks Exploration, LLC | Dover, OK 73734 | Gas Operator | Oct 2024 |
| 192 | Highmark Energy Operating, LLC | Houston, TX 77253 | Oil & Gas Operator | Sep 2026 |
| 193 | Hill, Hub, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 1994 |
| 194 | Hoc Operating Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Nov 1999 |
| 195 | Hog Partnership LP | Dallas, TX 75235 | Gas Operator | Jul 2026 |
| 196 | Holcomb Company, The | Freer, TX 78357 | Oil & Gas Operator | Aug 1996 |
| 197 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 198 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2002 |
| 199 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 200 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2026 |