| 201 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 202 | Gifford Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Jul 2003 |
| 203 | Global Natural Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | May 1998 |
| 204 | Go Oil Corp. | Jacksboro, TX 76458 | Oil & Gas Operator | May 2025 |
| 205 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 206 | Granite Operating Company | Houston, TX 77056 | Oil & Gas Operator | Nov 2012 |
| 207 | Grasen Energy, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Aug 2013 |
| 208 | Graves Operating | Perryton, TX 79070 | Oil & Gas Operator | Jul 2005 |
| 209 | Graves Operating, LLC | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 210 | Gray Operating Company, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2018 |
| 211 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 212 | GS Energy Of Texas, L.L.C. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2006 |
| 213 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 214 | Gulf Central Petroleum Corp. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 215 | Gunn Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 216 | Gunsmoke Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | May 2012 |
| 217 | H & L Exploration Company, LLC | Amarillo, TX 79114 | Oil & Gas Operator | May 2025 |
| 218 | H & L Operating Co., L.L.P. | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 219 | H & L Operating Co., LLC | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2021 |
| 220 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 221 | H-S Exploration | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 222 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | May 2025 |
| 223 | Hadaway Engineering Inc | Canadian, TX 79014 | Oil & Gas Operator | Jul 2015 |
| 224 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 225 | Haider Operating, LLC | Pampa, TX 79066 | Oil & Gas Operator | May 2025 |
| 226 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 227 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 228 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 229 | Harper Production, LLC | Spearman, TX 79081 | Oil & Gas Operator | May 2025 |
| 230 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 231 | Haywood, Paul M. Jr. | Denton, TX 76206 | Oil & Gas Operator | Mar 2002 |
| 232 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 233 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 234 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 235 | Hicks Exploration, LLC | Dover, OK 73734 | Gas Operator | Jan 2025 |
| 236 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | May 2025 |
| 237 | Hodgden, Jack D. | Enid, OK 73702 | Oil & Gas Operator | Apr 2000 |
| 238 | Holmes Exploration, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2015 |
| 239 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 240 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 241 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 242 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | May 2025 |
| 243 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 244 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2025 |
| 245 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 246 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2025 |
| 247 | Hy-Tech, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Feb 2017 |
| 248 | Hyalite Energy Corporation | Pampa, TX 79066 | Oil & Gas Operator | Feb 2025 |
| 249 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 250 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 251 | J-Brex Company | Amarillo, TX 79101 | Oil & Gas Operator | May 2025 |
| 252 | JCB II Enterprises LLC | Perryton, TX 79070 | Oil & Gas Operator | Jun 2023 |
| 253 | JCR, Jr - Operating, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Apr 2022 |
| 254 | Jeswood Productions, LLC | Denton, TX 76206 | Oil & Gas Operator | May 2025 |
| 255 | JHS Energy, Inc | Denver, CO 80222 | Oil & Gas Operator | Jan 2025 |
| 256 | Jiahe Energy, LLC | Katy, TX 77450 | Gas Operator | May 2025 |
| 257 | Jilpetco, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | May 2025 |
| 258 | Jones Energy LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2025 |
| 259 | Jones Energy, LTD. | Austin, TX 78746 | Oil & Gas Operator | Sep 2013 |
| 260 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 261 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2025 |
| 262 | Karper Company, The | Graham, TX 76450 | Oil & Gas Operator | Feb 2003 |
| 263 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 264 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 265 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 266 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 267 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 268 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 269 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 270 | Kile Production | Cypress, TX 77410 | Oil & Gas Operator | Aug 2014 |
| 271 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | May 2025 |
| 272 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 273 | Laddex, LTD. | Amarillo, TX 79102 | Oil & Gas Operator | May 2025 |
| 274 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 275 | Lasater & Co, Inc. | Spearman, TX 79081 | Oil & Gas Operator | May 2025 |
| 276 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 277 | Latigo (Texas), LLC | Tulsa, OK 74119 | Oil & Gas Operator | May 2025 |
| 278 | Latigo Petroleum LLC | Pampa, TX 79066 | Oil & Gas Operator | May 2025 |
| 279 | Latigo Petroleum Texas, LP | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 280 | Latigo Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2025 |
| 281 | LDX Operating Company, LLC. | Amarillo, TX 79102 | Oil & Gas Operator | May 2025 |
| 282 | Le Norman Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2019 |
| 283 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | May 2025 |
| 284 | Legado Midcon, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 285 | Leicht, Cecil | Streetman, TX 75859 | Oil & Gas Operator | Feb 1998 |
| 286 | Lera | Borger, TX 79007 | Oil & Gas Operator | May 2025 |
| 287 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 288 | Limited Resources | Perryton, TX 79070 | Oil & Gas Operator | Aug 2003 |
| 289 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 290 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 291 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 292 | Lone Tree Oil & Gas LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | May 2025 |
| 293 | Loudel, Inc. | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 294 | M'Red Petroleum, LLC | Pampa, TX 79065 | Oil & Gas Operator | Dec 2010 |
| 295 | M3V Energy, LLC | Perryton, TX 79070 | Oil & Gas Operator | May 2025 |
| 296 | Majestic Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 2007 |
| 297 | Makar Production Company | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 298 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 299 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 300 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |