| 201 | Hartco Oil Co. | | Oil Operator | Jan 2025 |
| 202 | Haw Corporation | | Oil Operator | Dec 1979 |
| 203 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 204 | Held By Production, Inc. | Houston, TX 77251 | Oil & Gas Operator | May 1996 |
| 205 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 206 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 207 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Feb 2026 |
| 208 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 209 | Hughes Supplies, Inc. | Greenwood, LA 71033 | Oil & Gas Operator | Jul 2019 |
| 210 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 211 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 212 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 213 | J-Lu LTD Co | Ashdown, AR 71822 | Oil Operator | Jan 2025 |
| 214 | J-W Gathering Company | | Oil Operator | Jun 2016 |
| 215 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Feb 2026 |
| 216 | J. D. Ward Oil Company | | Oil Operator | Oct 2002 |
| 217 | J. G. Floyd | | Oil Operator | Jun 1985 |
| 218 | J. L. Dews | | Oil Operator | Jan 2025 |
| 219 | Jack T. Everett | | Oil & Gas Operator | Jan 2006 |
| 220 | Jag Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2019 |
| 221 | Jag Pva Re-Development, LLC | | Oil Operator | Dec 2024 |
| 222 | James A Crowson, Jr | | Oil & Gas Operator | Jun 2010 |
| 223 | James L Barber | | Oil Operator | Aug 1996 |
| 224 | James P. Hardey | | Oil Operator | Jul 2003 |
| 225 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Feb 2026 |
| 226 | Jeems Bayou Production Corp. | Oil City, LA 71061 | Oil & Gas Operator | Feb 2026 |
| 227 | Jetta Operating Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 228 | Jimmy Roberson Energy Corp. | Texarkana, TX 75503 | Oil & Gas Operator | Sep 2012 |
| 229 | JLM Sartor Inc | | Oil & Gas Operator | Jul 2016 |
| 230 | Jones Oil Company | Ardmore, OK 73402-1389 | Oil & Gas Operator | Aug 2022 |
| 231 | Josey Exploration, Inc. | | Oil & Gas Operator | Dec 1988 |
| 232 | Justiss Oil Company, Inc. | Jena, LA 71342 | Oil & Gas Operator | Nov 2025 |
| 233 | K & G Production | | Oil Operator | Jan 2025 |
| 234 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 235 | Kamlok, Inc. | | Oil Operator | Nov 1991 |
| 236 | Kanpetro, Inc. | | Oil Operator | May 1991 |
| 237 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 238 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 239 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 240 | Keba Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2015 |
| 241 | Keith W. Burton | | Oil & Gas Operator | Jan 2025 |
| 242 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2025 |
| 243 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 244 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 245 | Kmi Continental Off. Prod. Co. | | Oil & Gas Operator | Jan 1988 |
| 246 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 247 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 248 | L. R. Resources II | | Oil & Gas Operator | Feb 1991 |
| 249 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 250 | Lamar Matlock | | Oil Operator | Jan 2025 |
| 251 | Lanford Drilling Co., Inc. | | Oil Operator | Jun 1996 |
| 252 | Lark Production, Inc. | | Oil & Gas Operator | Mar 2023 |
| 253 | Laser Gas Company I, LLC | | Oil Operator | Aug 2007 |
| 254 | Legacy Resources Co., L.P. | | Oil & Gas Operator | Apr 2019 |
| 255 | Lexico Exploration | | Oil Operator | Mar 1986 |
| 256 | LHC Petroleum Corporation | | Oil & Gas Operator | Jul 2001 |
| 257 | Liberty Oil & Gas Corp | Olney, IL 62450-2489 | Oil & Gas Operator | Dec 2021 |
| 258 | Liberty Operating Company,LLC | | Oil & Gas Operator | Jan 2026 |
| 259 | Lindenmuth & Associates | | Oil & Gas Operator | Aug 2001 |
| 260 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 261 | Linn Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 262 | Lloyd E. Hargrove | | Oil & Gas Operator | Aug 1998 |
| 263 | Loch Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 264 | Long Oil & Natural Gas Corp. | | Oil & Gas Operator | Feb 1996 |
| 265 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 266 | Louisiana Energy Consultants, Inc. | | Oil & Gas Operator | Dec 2024 |
| 267 | Louisiana Minerals, LTD. | Houston, TX 77024 | Oil & Gas Operator | Jul 1988 |
| 268 | Louisiana-Hunt Petroleum Corp. | | Oil & Gas Operator | Dec 1985 |
| 269 | Loutex Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 270 | Lyons Petroleum Inc.-Dykes | | Oil & Gas Operator | Oct 1988 |
| 271 | M & M Production | | Oil & Gas Operator | Jun 2010 |
| 272 | M & T Petroleum Management Inc | | Oil Operator | May 1984 |
| 273 | M. S. Delone | | Oil Operator | Nov 1990 |
| 274 | Ma-Si, Inc. | | Oil & Gas Operator | May 1998 |
| 275 | Majestic Energy Corporation | Shreveport, LA 71164 | Oil & Gas Operator | May 2013 |
| 276 | Map Associates, L.P. | | Oil & Gas Operator | Mar 1995 |
| 277 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 278 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 279 | Marlin And Davis | | Oil Operator | Sep 1987 |
| 280 | Marshall Exploration, Inc. | | Oil & Gas Operator | Jun 1992 |
| 281 | Martin Production Company | | Oil & Gas Operator | Dec 2024 |
| 282 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 283 | McCormick Production Co, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Feb 2026 |
| 284 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 285 | McKenzie Production Company | Houston, TX 77063 | Oil & Gas Operator | May 1995 |
| 286 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 287 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 288 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 289 | Mineral Equipment Co Inc. | | Oil & Gas Operator | May 1998 |
| 290 | Mineral Ventures, Inc. | | Oil & Gas Operator | Dec 2024 |
| 291 | Mississippi River Transm. Corp | | Oil & Gas Operator | Sep 2002 |
| 292 | Mobley Oil Company, Inc. | | Oil & Gas Operator | Feb 1990 |
| 293 | Monroe Well Ser-Oceanyacht1985 | | Oil Operator | Dec 1988 |
| 294 | Monroe Well Ser-Riverside 1985 | | Oil Operator | Dec 1988 |
| 295 | Monroe Well Service-East End | | Oil Operator | Dec 1988 |
| 296 | Monroe Well Service-Sla | | Oil Operator | Mar 1989 |
| 297 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 298 | Moon-Hines-Tigrett Opr Co Inc | | Oil & Gas Operator | Oct 1995 |
| 299 | Moran Oil Co., Inc. | | Oil & Gas Operator | Aug 2009 |
| 300 | Moransco Energy Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |