| 201 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 202 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 203 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 204 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 205 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 206 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 207 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 208 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 209 | Exchange Avenue Production Co. | Weatherford, TX 76086 | Oil & Gas Operator | Sep 2021 |
| 210 | Exl Petroleum Operating Inc. | Midland, TX 79705 | Oil & Gas Operator | Feb 2020 |
| 211 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Jul 2025 |
| 212 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 213 | Exxon Corp. - Midland | Houston, TX 77210 | Gas Operator | Jul 1997 |
| 214 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 215 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 216 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 217 | Falcon Creek Resources, Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Apr 2001 |
| 218 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 219 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | Jul 2025 |
| 220 | Fasken, Barbara | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 221 | Fed Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 222 | Felix Energy Holdings II, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Apr 2020 |
| 223 | Fenno, Tom Prod. | FT Collins, CO 80524 | Oil & Gas Operator | Mar 2018 |
| 224 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 225 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Jul 2025 |
| 226 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Jul 2025 |
| 227 | First Reserve Oil & Gas Co | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 228 | Flo Petro, LLC. | Austin, TX 78746 | Oil Operator | Jul 2025 |
| 229 | Floyd Operating Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2004 |
| 230 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 231 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 232 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 233 | Forge Energy, LLC | San Antonio, TX 78249 | Oil & Gas Operator | Apr 2019 |
| 234 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Jul 2025 |
| 235 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jul 2025 |
| 236 | Founders Oil & Gas Operating,LLC | Arlington, TX 76011 | Oil & Gas Operator | Jul 2023 |
| 237 | Four Corners Petroleum II, LLC | Denver, CO 80215 | Oil & Gas Operator | Feb 2023 |
| 238 | Freedom Energy, Inc. (I) | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jun 2003 |
| 239 | Freeman, Kathleen Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 1996 |
| 240 | Friemel, Paul D. & Assoc., Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2007 |
| 241 | Fueled Resources Inc | Boyd, TX 76023 | Oil & Gas Operator | Jul 2025 |
| 242 | Fulfer Oil And Cattle Co. | Jal, NM 88252 | Oil & Gas Operator | Jul 2025 |
| 243 | G & C Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 244 | G P II Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2020 |
| 245 | G.P.C. Oil And Gas Corporation | Midland, TX 79710 | Oil & Gas Operator | Feb 1993 |
| 246 | Gap Exploration, LTD. | Naples, FL 34110 | Oil & Gas Operator | Jul 2008 |
| 247 | Gda Investments Inc | Oklahoma City, OK 73123-0403 | Oil & Gas Operator | May 2025 |
| 248 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 249 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 250 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 251 | Geonatural Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 252 | Giebel Petroleum LTD. | Midland, TX 79705 | Oil & Gas Operator | Jul 2019 |
| 253 | Glahn Resources, Inc. | Arlington, TX 76003 | Oil & Gas Operator | Jul 2025 |
| 254 | Golden Oil And Ranch, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 255 | Golden, Marty Joe | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 256 | Grace Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Oct 2011 |
| 257 | Grace Petroleum Operating, LLC | Llano, TX 78643 | Oil & Gas Operator | Jul 2025 |
| 258 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 259 | Graham, Bill J. Oil & Gas Corp. | Midland, TX 79710 | Oil & Gas Operator | Nov 2000 |
| 260 | Great Basin Petroleum Serv, L.P. | Odessa, TX 79765 | Oil & Gas Operator | Jul 2008 |
| 261 | Great Basin Well Service Corp. | Odessa, TX 79765 | Oil & Gas Operator | Feb 2025 |
| 262 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 263 | Greka Am Inc | Santa Maria, CA 93454 | Oil & Gas Operator | May 2013 |
| 264 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 265 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 266 | H & S Drilling Co Inc | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2016 |
| 267 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 268 | Halcon Resources Operating, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2013 |
| 269 | Hall Exploration, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 270 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 271 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 272 | Hanger Oil, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 273 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 274 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 275 | Hanvey, Don H. Oil Interests Inc | Cisco, TX 76437 | Oil & Gas Operator | Jul 2025 |
| 276 | Hardwick, Mark P. Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 277 | Harkey Energy Inc. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2020 |
| 278 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Jul 2025 |
| 279 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 280 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 281 | Heifer Production Company LLC | Houston, TX 77098 | Oil & Gas Operator | Jul 2025 |
| 282 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Mar 2025 |
| 283 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 284 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 285 | Henry Resources LLC | Midland, TX 79703 | Oil & Gas Operator | Jul 2025 |
| 286 | Heritage Resources, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Feb 2014 |
| 287 | Heritage Standard Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 288 | Herricks Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Jan 2010 |
| 289 | High Desert Resources, L.L.C. | Midland, TX 79704 | Oil Operator | Jul 2025 |
| 290 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 291 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Jul 2025 |
| 292 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Jul 2025 |
| 293 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 294 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 295 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 296 | HMH Operators, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 297 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2025 |
| 298 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 299 | Hulsey Oil Company | Dallas, TX 75205 | Oil & Gas Operator | Aug 1999 |
| 300 | Hurst Oil & Gas, Inc. | Hillsboro, TX 76645 | Oil & Gas Operator | Dec 2024 |