| 201 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 202 | Grigsby Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 203 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 204 | Guaranty Energy Corporation | | Oil & Gas Operator | Aug 1990 |
| 205 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2012 |
| 206 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 207 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 208 | Gulf South Pipeline Company, LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2020 |
| 209 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |
| 210 | Gulfport Energy Corporation | Oklahoma City, OK 73134-5003 | Oil & Gas Operator | Dec 2024 |
| 211 | H E C I Exploration Company | | Oil & Gas Operator | Dec 1990 |
| 212 | Hal Oil & Gas Co., Inc. | | Oil & Gas Operator | Apr 1993 |
| 213 | Halcon Resources Operating, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2013 |
| 214 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 215 | Harbor Operating, LLC | | Oil & Gas Operator | Dec 1999 |
| 216 | Harbor Petroleum, LLC | Granbury, TX 76049 | Oil & Gas Operator | Mar 2025 |
| 217 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 218 | Hassie Hunt Expl. Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2008 |
| 219 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 220 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 221 | Henderson Pet Corp Of Delaware | | Oil & Gas Operator | Oct 2019 |
| 222 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 223 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Mar 2025 |
| 224 | Hochendel Consultants | | Oil & Gas Operator | Jul 1995 |
| 225 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 226 | Homer E. Hines, Inc. | | Oil Operator | Sep 1978 |
| 227 | Houma Operating Company, Inc. | | Oil & Gas Operator | Jun 1998 |
| 228 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 229 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 230 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
| 231 | Hughes Denny Offshore Expl Inc | | Oil & Gas Operator | Nov 1988 |
| 232 | Hughes Eastern Petroleum, LTD. | | Oil & Gas Operator | Jun 1986 |
| 233 | Hughes-Denny Petroleum Co.,Inc | | Oil & Gas Operator | Dec 1987 |
| 234 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 235 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 236 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 237 | Hydrocarbon MGMT., Inc. | | Oil & Gas Operator | Mar 1997 |
| 238 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 239 | Inflow Petroleum Resources LP | Dallas, TX 75240 | Oil & Gas Operator | Sep 2008 |
| 240 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 241 | International Oil & Gas Corp. | | Oil & Gas Operator | Dec 1986 |
| 242 | Intrepid Drilling, LLC | | Oil & Gas Operator | Jan 2025 |
| 243 | J. M. Huber Corp. | Houston, TX 77079 | Oil & Gas Operator | Sep 2004 |
| 244 | James A. Whitson, Jr, Et Al | | Oil & Gas Operator | Aug 1988 |
| 245 | James A. Whitson, Jr. | | Oil & Gas Operator | Apr 2016 |
| 246 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 247 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Mar 2025 |
| 248 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 249 | Kedco Management Corp | | Oil & Gas Operator | Jul 1985 |
| 250 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 251 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 252 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 253 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 254 | Keystone Operating Co. | Round Rock, TX 78681 | Oil & Gas Operator | Mar 2025 |
| 255 | Kilroy Co. Of Texas, Inc. | | Oil & Gas Operator | Jun 1991 |
| 256 | Kilroy Co.- E.L. Cox | | Oil & Gas Operator | Aug 1990 |
| 257 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 258 | Kinetica Partners, LLC | | Oil Operator | Dec 2024 |
| 259 | Kinlaw Oil Corporation | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 260 | Kirby Exploration Co | Houston, TX 77251 | Oil & Gas Operator | Jan 2014 |
| 261 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 262 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 263 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 264 | Konantz, Inc. | | Oil & Gas Operator | Jan 1995 |
| 265 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 266 | La Delta Farms Oil Company LLC | | Oil & Gas Operator | Dec 2024 |
| 267 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 268 | La Mesa Production, Inc. | | Oil & Gas Operator | Apr 2004 |
| 269 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 270 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 271 | Legacy Resources Co., L.P. | | Oil & Gas Operator | Apr 2019 |
| 272 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 273 | LGS Exploration, Inc. | | Oil & Gas Operator | Jan 1991 |
| 274 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 275 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Mar 2025 |
| 276 | Littlefield Oil & Gas Company | | Oil & Gas Operator | Jan 1990 |
| 277 | Llog Expl. Co. | Metairie, LA 70005 | Oil & Gas Operator | Jan 2003 |
| 278 | Llog Exploration Company, LLC | | Oil & Gas Operator | Dec 2024 |
| 279 | Llox, L.L.C. | Covington, LA 70433 | Oil & Gas Operator | Mar 2025 |
| 280 | Longville Production Co., Inc. | | Oil & Gas Operator | Sep 1995 |
| 281 | Louis J. Roussel | | Oil & Gas Operator | Sep 1991 |
| 282 | Louisiana Delta Oil Co, LLC | | Oil & Gas Operator | Nov 2024 |
| 283 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 284 | Loutex Energy, Inc. | Shrevesport, LA 71101 | Oil & Gas Operator | Apr 1992 |
| 285 | Lower Lafourche Corporation | | Oil & Gas Operator | Jan 1997 |
| 286 | Lynal, Inc. | | Oil & Gas Operator | Oct 1988 |
| 287 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 288 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Jan 2025 |
| 289 | Magnum Minerals, Inc. | | Oil & Gas Operator | May 1998 |
| 290 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 291 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Mar 2025 |
| 292 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 293 | Maritech Resources, LLC | | Oil & Gas Operator | May 2011 |
| 294 | Mark Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 1987 |
| 295 | Marlin Energy Offshore, L.L.C. | | Oil & Gas Operator | Jun 2006 |
| 296 | Marquis Resources, LLC | | Oil & Gas Operator | Jul 2021 |
| 297 | Martin Exploration Co. | | Oil & Gas Operator | Apr 1986 |
| 298 | Masters Resources, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Dec 2008 |
| 299 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 300 | McAlester Fuel Co | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |