| 201 | HC Resources, Inc. | | Oil & Gas Operator | Jul 2011 |
| 202 | HCW Exploration, Inc. | | Oil & Gas Operator | Jun 1986 |
| 203 | Hemco Development, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2020 |
| 204 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 205 | Heritage Operating Co., Inc. The | Stafford, TX 77497 | Oil & Gas Operator | May 1997 |
| 206 | HGH Energy, Inc. | | Oil & Gas Operator | Jun 2001 |
| 207 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Nov 2024 |
| 208 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 209 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Nov 2024 |
| 210 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 211 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 212 | Hugh A. Hawthorne, Et Al | | Oil & Gas Operator | Dec 1978 |
| 213 | Imperial-American Energy,Inc. | | Oil & Gas Operator | Jul 1978 |
| 214 | Indian Exploration, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2024 |
| 215 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 216 | Intrepid Drilling, LLC | | Oil & Gas Operator | May 2024 |
| 217 | Iowa Production Company, Inc. | | Oil & Gas Operator | Jan 1992 |
| 218 | Itr Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 219 | J & J Onshore Production, Inc. | | Oil & Gas Operator | Feb 2016 |
| 220 | J. P. Van Way | | Oil & Gas Operator | Jun 2024 |
| 221 | Jackson Petroleum Co., Inc. | | Oil & Gas Operator | Feb 2010 |
| 222 | Jake L. Hamon | | Oil & Gas Operator | Dec 1983 |
| 223 | James A. Whitson, Jr. | | Oil & Gas Operator | Apr 2016 |
| 224 | Janex Oil Co., Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jun 2005 |
| 225 | Jennings Holdings, LLC | | Oil & Gas Operator | Jun 2024 |
| 226 | JLS Investments | | Oil & Gas Operator | Mar 2002 |
| 227 | Joe W. Burrage | | Oil Operator | Jun 1986 |
| 228 | John W. McGowan | | Oil & Gas Operator | Jun 1991 |
| 229 | Johnson Oil & Gas Corporation | | Oil & Gas Operator | Feb 1994 |
| 230 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2024 |
| 231 | Jordan Oil Company, Inc. | Lake Charles, LA 70602 | Oil & Gas Operator | Dec 2019 |
| 232 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Nov 2024 |
| 233 | Kaneb Energy Company | | Oil & Gas Operator | Jan 1986 |
| 234 | Kaneb Oil & Gas Company | | Oil & Gas Operator | Nov 1985 |
| 235 | Kaneb Operg Co. LTD. PTN. | | Oil & Gas Operator | Aug 1988 |
| 236 | Kash Oil And Gas, Inc | | Oil & Gas Operator | Oct 2020 |
| 237 | Kelly H. Baxter | Austin, TX 78767 | Oil & Gas Operator | Nov 2006 |
| 238 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2024 |
| 239 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 240 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 241 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 242 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jun 2024 |
| 243 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Nov 2024 |
| 244 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 245 | King Ranch Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 246 | King Resources Co. | | Oil & Gas Operator | Dec 1977 |
| 247 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 248 | L & T Exploration | | Oil & Gas Operator | Dec 1987 |
| 249 | L E Carpenter Oil & Gas, Inc. | | Oil & Gas Operator | Sep 1985 |
| 250 | La Mesa Production, Inc. | | Oil & Gas Operator | Apr 2004 |
| 251 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 252 | Lakeside Resources | | Oil & Gas Operator | Mar 1989 |
| 253 | Lamson Petroleum Corporation | | Oil & Gas Operator | Mar 1993 |
| 254 | Lamson/Crocker Petroleum Corp. | | Oil & Gas Operator | May 1988 |
| 255 | Lamson/Onshore Petroleum Corp. | | Oil & Gas Operator | Sep 1985 |
| 256 | Lancer Resources Company | | Oil & Gas Operator | Jan 1998 |
| 257 | Las Services, Inc. | | Oil & Gas Operator | Oct 1997 |
| 258 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 259 | Laurel Operating Company, Inc. | Stillwater, OK 74074-3025 | Oil & Gas Operator | Sep 2024 |
| 260 | Lea Exploration, Inc. | | Oil & Gas Operator | Nov 1989 |
| 261 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 262 | Legendary Oil Co., Inc. | | Oil Operator | Feb 2004 |
| 263 | Leger Production Company, Inc. | | Oil & Gas Operator | Apr 1984 |
| 264 | Liberty Oil And Gas Corp. | Olney, IL 62450-2489-2489 | Oil & Gas Operator | Dec 2021 |
| 265 | Linder Oil Company | | Oil & Gas Operator | Apr 1985 |
| 266 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Nov 2024 |
| 267 | Llog Expl. Co. | Metairie, LA 70005 | Oil & Gas Operator | Jan 2003 |
| 268 | Louisiana Crude Oil&Gas Co Inc | | Oil & Gas Operator | Mar 1984 |
| 269 | Louisiana Gas System, Inc. | | Oil Operator | Apr 2004 |
| 270 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 271 | Louisiana Jordan Oil Co, Inc. | Lake Charles, LA 70602 | Oil & Gas Operator | Jun 2024 |
| 272 | Louisiana Tank, Inc. | | Oil Operator | Mar 2023 |
| 273 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | Nov 2024 |
| 274 | Lyco Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jun 2015 |
| 275 | Lyn-Que Oil & Gas, Inc. | | Oil Operator | Sep 1992 |
| 276 | Lynal, Inc. | | Oil & Gas Operator | Oct 1988 |
| 277 | Lynal, Inc.- Michel T Halbouty | | Oil & Gas Operator | Oct 1984 |
| 278 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 279 | M & M Investments | | Oil & Gas Operator | May 1990 |
| 280 | M. P. S. Prod. Co. | Houston, TX 77225 | Oil & Gas Operator | Dec 1996 |
| 281 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Sep 2024 |
| 282 | Magna Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 283 | Mapco Oil & Gas Company | Tulsa, OK 74101-2115 | Oil & Gas Operator | Jan 1985 |
| 284 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 285 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 286 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 287 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 288 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Sep 2024 |
| 289 | Marmaton Oil Company | Houston, TX 77002 | Oil & Gas Operator | Jul 1998 |
| 290 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |
| 291 | Marquis Resources, LLC | | Oil & Gas Operator | Jul 2021 |
| 292 | Marshall Petroleum, Inc. | Houston, TX 77040 | Oil & Gas Operator | Aug 2003 |
| 293 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 294 | McConathy Production Co.,Inc. | | Oil & Gas Operator | Jun 1990 |
| 295 | McCord Exploration Co. | | Oil & Gas Operator | Dec 1990 |
| 296 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 297 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Nov 2024 |
| 298 | McKenzie Management Inc. | | Oil & Gas Operator | Aug 1989 |
| 299 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 300 | McMoran Production Co. | | Oil & Gas Operator | May 1985 |