| 201 | H & K Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |
| 202 | H & S Drilling Co Inc | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2016 |
| 203 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Jul 2025 |
| 204 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 205 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Jul 2025 |
| 206 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 207 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Mar 2025 |
| 208 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 209 | Henry Petroleum LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2008 |
| 210 | Henry Resources LLC | Midland, TX 79703 | Oil & Gas Operator | Jul 2025 |
| 211 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 212 | Hexp Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 213 | HGN Operating Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 214 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 215 | Hicon Gas Producers, Inc. | New York, NY 10110 | Oil & Gas Operator | Oct 1999 |
| 216 | Highmark Energy Operating, LLC | Dallas, TX 75222 | Oil & Gas Operator | Jul 2025 |
| 217 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Jul 2025 |
| 218 | Hillin Simon/Prime Expl., L.C. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 219 | Holly Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2008 |
| 220 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 221 | HPPC, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2023 |
| 222 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 223 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 224 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 225 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 226 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 227 | Invoil, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2025 |
| 228 | J L B Operating Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2000 |
| 229 | Jaco Production Company | Bakersfield, CA 93380 | Oil Operator | Apr 2025 |
| 230 | JCR, Jr - Operating, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Apr 2022 |
| 231 | JM Cox Resources LP | Midland, TX 79702 | Oil & Gas Operator | Apr 2019 |
| 232 | Joplin Oil Co., Inc. | Lubbock, TX 79423 | Oil & Gas Operator | Jul 2025 |
| 233 | Jurassic Exploration, Inc. | Longview, TX 75601 | Oil & Gas Operator | Jul 2025 |
| 234 | K.W.A., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 235 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 236 | Kala Oil Company | Sundown, TX 79372 | Oil & Gas Operator | Jul 2025 |
| 237 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Apr 2025 |
| 238 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 239 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 240 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 241 | Keystone Petroleum GP LLC | Irving, TX 75039 | Oil & Gas Operator | May 2012 |
| 242 | Kidd Oil & Gas, LC | Dallas, TX 75219 | Oil & Gas Operator | Apr 1999 |
| 243 | Kimbrough Engineering Co, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2014 |
| 244 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 245 | Lankford Oil Co. | Weatherford, TX 76086 | Oil & Gas Operator | Jul 1999 |
| 246 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 247 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 248 | Latigo Petroleum Texas, LP | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 249 | Latimer, D. Gail Enterprises,Inc | Snyder, TX 79550 | Oil & Gas Operator | Jul 2004 |
| 250 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jul 2025 |
| 251 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 252 | Lone Star Oil & Gas | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 253 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 254 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 255 | M-T Petroleum, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2008 |
| 256 | M.B. Properties, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Oct 1995 |
| 257 | Mahfouz Energy Company | Houston, TX 77255 | Oil & Gas Operator | Nov 2020 |
| 258 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 259 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Jul 2025 |
| 260 | Manzano LLC | Roswell, NM 88202 | Oil & Gas Operator | Jul 2025 |
| 261 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 262 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 263 | Marlin Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 264 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 265 | Marshall Petroleum, Inc. | Houston, TX 77040 | Oil & Gas Operator | Aug 2003 |
| 266 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 267 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 268 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 269 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 270 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 271 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 272 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 273 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 274 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Jul 2025 |
| 275 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 276 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 277 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 278 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 279 | Miller, Dyer & Co LLC | Denver, CO 80202 | Oil & Gas Operator | May 2009 |
| 280 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 281 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 282 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Jul 2025 |
| 283 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 284 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 285 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 286 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 287 | Monadnock Resources Op Co, LLC | Dallas, TX 75209 | Oil & Gas Operator | Jan 2021 |
| 288 | Monadnock Resources, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2020 |
| 289 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 290 | Morningstar Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 291 | Morningstar Partners, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2022 |
| 292 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Apr 2025 |
| 293 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 294 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 295 | Myco Petroleum | Lovington, NM 88260 | Oil & Gas Operator | Jul 2025 |
| 296 | Myd, Inc. | Irving, TX 75062 | Oil & Gas Operator | Mar 1998 |
| 297 | Nadel And Gussman Permian,L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 298 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 299 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Jul 2025 |
| 300 | New Height Energy, LLC | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |