| 201 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 202 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 203 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2024 |
| 204 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 205 | Hughes Supplies, Inc. | Greenwood, LA 71033 | Oil & Gas Operator | Jul 2019 |
| 206 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 207 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 208 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 209 | J-Lu LTD Co | Ashdown, AR 71822 | Oil Operator | Jan 2024 |
| 210 | J-W Gathering Company | | Oil Operator | Jun 2016 |
| 211 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | May 2024 |
| 212 | J. D. Ward Oil Company | | Oil Operator | Oct 2002 |
| 213 | J. G. Floyd | | Oil Operator | Jun 1985 |
| 214 | J. L. Dews | | Oil Operator | Jan 2024 |
| 215 | Jack T. Everett | | Oil & Gas Operator | Jan 2006 |
| 216 | Jag Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2019 |
| 217 | James A Crowson, Jr | | Oil & Gas Operator | Jun 2010 |
| 218 | James L Barber | | Oil Operator | Aug 1996 |
| 219 | James P. Hardey | | Oil Operator | Jul 2003 |
| 220 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | May 2024 |
| 221 | Jeems Bayou Production Corp. | Oil City, LA 71061 | Oil & Gas Operator | May 2024 |
| 222 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2024 |
| 223 | Jimmy Roberson Energy Corp. | Texarkana, TX 75503 | Oil & Gas Operator | Sep 2012 |
| 224 | JLM Sartor Inc | | Oil & Gas Operator | Jul 2016 |
| 225 | Jones Oil Company | Ardmore, OK 73402-1389 | Oil & Gas Operator | Aug 2022 |
| 226 | Josey Exploration, Inc. | | Oil & Gas Operator | Dec 1988 |
| 227 | Justiss Oil Company, Inc. | Jena, LA 71342 | Oil & Gas Operator | Dec 2023 |
| 228 | K & G Production | | Oil Operator | Jan 2024 |
| 229 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2024 |
| 230 | Kamlok, Inc. | | Oil Operator | Nov 1991 |
| 231 | Kanpetro, Inc. | | Oil Operator | May 1991 |
| 232 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 233 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2010 |
| 234 | KCS Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 235 | Keba Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2015 |
| 236 | Keith W. Burton | | Oil & Gas Operator | Jan 2024 |
| 237 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2023 |
| 238 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | May 2024 |
| 239 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 240 | Kmi Continental Off. Prod. Co. | | Oil & Gas Operator | Jan 1988 |
| 241 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 242 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 243 | L. R. Resources II | | Oil & Gas Operator | Feb 1991 |
| 244 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 245 | Lamar Matlock | | Oil Operator | Jan 2024 |
| 246 | Lanford Drilling Co., Inc. | | Oil Operator | Jun 1996 |
| 247 | Lark Production, Inc. | | Oil & Gas Operator | Mar 2023 |
| 248 | Laser Gas Company I, LLC | | Oil Operator | Aug 2007 |
| 249 | Legacy Resources Co., L.P. | Indianapolis, IN 46214 | Oil & Gas Operator | Apr 2019 |
| 250 | Lexico Exploration | | Oil Operator | Mar 1986 |
| 251 | LHC Petroleum Corporation | | Oil & Gas Operator | Jul 2001 |
| 252 | Liberty Oil And Gas Corp. | Olney, IL 62450-2489-2489 | Oil & Gas Operator | Dec 2021 |
| 253 | Liberty Operating Company,LLC | | Oil & Gas Operator | Feb 2024 |
| 254 | Lindenmuth & Associates | | Oil & Gas Operator | Aug 2001 |
| 255 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 256 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 257 | Long Oil & Natural Gas Corp. | | Oil & Gas Operator | Feb 1996 |
| 258 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 259 | Louisiana Energy Consultants, Inc. | | Oil & Gas Operator | Dec 2023 |
| 260 | Louisiana Minerals, LTD. | Houston, TX 77024 | Oil & Gas Operator | Jul 1988 |
| 261 | Louisiana-Hunt Petroleum Corp. | | Oil & Gas Operator | Dec 1985 |
| 262 | Loutex Production Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 263 | Lyons Petroleum Inc.-Dykes | | Oil & Gas Operator | Oct 1988 |
| 264 | M & M Production | | Oil & Gas Operator | Jun 2010 |
| 265 | M & T Petroleum Management Inc | | Oil Operator | May 1984 |
| 266 | M. S. Delone | | Oil Operator | Nov 1990 |
| 267 | Ma-Si, Inc. | | Oil & Gas Operator | May 1998 |
| 268 | Majestic Energy Corporation | Shreveport, LA 71164 | Oil & Gas Operator | May 2013 |
| 269 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 270 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Mar 2024 |
| 271 | Marlin And Davis | | Oil Operator | Sep 1987 |
| 272 | Marshall Exploration, Inc. | | Oil & Gas Operator | Jul 1992 |
| 273 | Martin Production Company | | Oil & Gas Operator | Dec 2023 |
| 274 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | May 2024 |
| 275 | McCormick Production Co, Inc. | Oil City, LA 71061 | Oil & Gas Operator | May 2024 |
| 276 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 277 | McKenzie Production Company | Houston, TX 77063 | Oil & Gas Operator | May 1995 |
| 278 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 279 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 280 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 281 | Mineral Ventures, Inc. | | Oil & Gas Operator | Dec 2023 |
| 282 | Mississippi River Transm. Corp | | Oil & Gas Operator | Sep 2002 |
| 283 | Mobley Oil Company, Inc. | | Oil & Gas Operator | Feb 1990 |
| 284 | Monroe Well Ser-Oceanyacht1985 | | Oil Operator | Dec 1988 |
| 285 | Monroe Well Ser-Riverside 1985 | | Oil Operator | Dec 1988 |
| 286 | Monroe Well Service-East End | | Oil Operator | Dec 1988 |
| 287 | Monroe Well Service-Sla | | Oil Operator | Mar 1989 |
| 288 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 289 | Moon-Hines-Tigrett Opr Co Inc | | Oil & Gas Operator | Oct 1995 |
| 290 | Moran Oil Co., Inc. | | Oil & Gas Operator | Aug 2009 |
| 291 | Moransco Energy Corporation | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 292 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 293 | MRD Operating LLC | | Oil & Gas Operator | Dec 2016 |
| 294 | MRT Exploration Co | | Oil & Gas Operator | Feb 1983 |
| 295 | N Central Casing Pullers, Inc. | | Oil & Gas Operator | May 1994 |
| 296 | Nabors Drilling Company, Inc. | | Oil & Gas Operator | Aug 1977 |
| 297 | Nadel And Gussman Ruston, LLC | | Oil & Gas Operator | Nov 2023 |
| 298 | Nasser Oil & Gas, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 299 | Nelson Oil & Gas, Inc. | | Oil & Gas Operator | Aug 1995 |
| 300 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | May 2024 |