| 101 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 102 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 103 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 104 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Oct 2025 |
| 105 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 106 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 107 | DSX Operating Co. | Amarillo, TX 79105 | Oil & Gas Operator | Mar 2008 |
| 108 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 109 | Dunigan Operating Company, Inc. | Austin, TX 78755 | Oil & Gas Operator | Oct 2025 |
| 110 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 111 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 112 | Dyne Oil & Gas,Inc. | Borger, TX 79008 | Oil & Gas Operator | Dec 2017 |
| 113 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 114 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 115 | Eakin Brothers | Pampa, TX 79065 | Gas Operator | Oct 2025 |
| 116 | El Ran, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Oct 2025 |
| 117 | Elendil Resources LLC | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 118 | Empire Operating, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2017 |
| 119 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 120 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 121 | Energon Oil & Gas Inc. | Odessa, TX 79762 | Oil & Gas Operator | Aug 2003 |
| 122 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2025 |
| 123 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | Oct 2025 |
| 124 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 125 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 126 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 127 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 128 | Estacado Energy, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 1999 |
| 129 | Estate Of Jerome B. Herrmann | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2022 |
| 130 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 131 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 132 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 133 | Evans Production Co. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2020 |
| 134 | Exxcel Production Company | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 135 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 136 | F. B. R. Production Company | Pampa, TX 79066 | Oil & Gas Operator | May 2000 |
| 137 | Fairway Links Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2016 |
| 138 | Fletcher, M. D. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2007 |
| 139 | Fora Company | Borger, TX 79007 | Oil & Gas Operator | Oct 2025 |
| 140 | Fort Worth Natural Gas, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 141 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Jul 2025 |
| 142 | Frisco Oil Corporation | Tyler, TX 75701 | Oil & Gas Operator | Mar 2000 |
| 143 | Future Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 1999 |
| 144 | FX Energy Operating, LLC | Canadian, TX 79014 | Oil & Gas Operator | Oct 2025 |
| 145 | G C & W Inc. | Borger, TX 79007 | Oil & Gas Operator | Oct 2016 |
| 146 | G. H. Ranch Management, LLC | Pampa, TX 79066 | Oil & Gas Operator | Apr 2013 |
| 147 | G. H. Ranch, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Feb 2006 |
| 148 | G. H. Ranch, LLC | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 149 | Gaea Services, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2021 |
| 150 | Galt Oil & Gas, LLC | Pampa, TX 79065 | Oil & Gas Operator | Apr 2020 |
| 151 | Ganchos Inc. | Borger, TX 79008 | Oil & Gas Operator | Mar 2007 |
| 152 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 153 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 154 | Grand Petroleum Co. | Pampa, TX 79065 | Oil & Gas Operator | Jul 2017 |
| 155 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 156 | Gross, L. Jack Production | Borger, TX 79008 | Oil & Gas Operator | Dec 1994 |
| 157 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 158 | Gunsmoke Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | May 2012 |
| 159 | Gypsy Oil Co. | Austin, TX 78720 | Oil & Gas Operator | Jul 2017 |
| 160 | H & L Exploration Company, LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2025 |
| 161 | H-D Operating Services L.L.C. | Pampa, TX 79065 | Oil Operator | Oct 2025 |
| 162 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 163 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 164 | Helton Petroleum | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 165 | Helton, Pat A. & Alberta | Allison, TX 79003 | Oil & Gas Operator | Oct 2025 |
| 166 | Henry Paul Petroleum, LLC | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 167 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2025 |
| 168 | Herrmann, J.B. | Amarillo, TX 79159 | Oil & Gas Operator | Aug 2019 |
| 169 | Herrmann, S. W. Oil & Gas | Amarillo, TX 79159 | Oil & Gas Operator | Oct 2025 |
| 170 | Hess Production | Quitaque, TX 79255 | Oil & Gas Operator | Oct 2025 |
| 171 | Holland Oil Co. | Petrolia, TX 76377 | Oil Operator | Aug 2010 |
| 172 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 173 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Oct 2025 |
| 174 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 175 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 176 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 177 | Hy-Tech, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Feb 2017 |
| 178 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 179 | J-Gar, Inc. | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2003 |
| 180 | J-Gar, LTD. | Amarillo, TX 79101 | Gas Operator | Dec 2019 |
| 181 | Jaco Oil & Gas | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 182 | Jade Enterprises, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 183 | Ji Energy LLC | Midland, TX 79707 | Gas Operator | Oct 2025 |
| 184 | Jiro | Stinnett, TX 79083 | Oil & Gas Operator | Oct 2025 |
| 185 | Jmar Petroleum LLC | McLean, TX 79057 | Gas Operator | Oct 2025 |
| 186 | Jones Energy, LTD. | Austin, TX 78746 | Oil & Gas Operator | Sep 2013 |
| 187 | JTL Operating Co Inc | Katy, TX 77450 | Oil & Gas Operator | Oct 2025 |
| 188 | Jurassic Exploration, Inc. | Longview, TX 75601 | Oil & Gas Operator | Oct 2025 |
| 189 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 190 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2025 |
| 191 | Kat Energy Corporation | Amarillo, TX 79105 | Gas Operator | Sep 2001 |
| 192 | Kellerville Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Oct 2025 |
| 193 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Oct 2025 |
| 194 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 195 | Kimberlin & Miller | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 196 | Kimbrel Oil Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2025 |
| 197 | King Oil & Resources Co | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 198 | Kirkpatrick Oil & Gas Co. | Pampa, TX 79066 | Oil & Gas Operator | Apr 1996 |
| 199 | Kirkpatrick Oil & Gas L.L.C. | Midland, TX 79701 | Oil & Gas Operator | Dec 2010 |
| 200 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |