| 201 | Henderson, Peter Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2020 |
| 202 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 203 | Henry Petroleum LLC | Flower Mound, TX 75028 | Oil & Gas Operator | Mar 2025 |
| 204 | Henson Exploration, L.P. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 205 | HGN Operating Co Inc | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 206 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 207 | Hickox Oil Texas Company, Inc. | Mobile, AL 36689 | Oil & Gas Operator | Feb 1996 |
| 208 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 209 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 210 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 211 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 212 | Huffman, H. L., LTD. | Fort Worth, TX 76113 | Oil & Gas Operator | Sep 1994 |
| 213 | Hulen Operating Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 214 | Hurst Oil & Gas, Inc. | Hillsboro, TX 76645 | Oil & Gas Operator | Dec 2024 |
| 215 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |
| 216 | Hyquest Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2015 |
| 217 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 218 | Incline Energy | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 219 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 220 | Iron Orchard Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 221 | J & J Services Company | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2025 |
| 222 | J L B Operating Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2000 |
| 223 | J Oil & Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2016 |
| 224 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Mar 2025 |
| 225 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 226 | Journey Operating, L.L.C. | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 227 | JTL Operating Co Inc | Katy, TX 77450 | Oil & Gas Operator | Mar 2025 |
| 228 | Kinney Incorporated | Andrews, TX 79714 | Oil & Gas Operator | Mar 2025 |
| 229 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 230 | Kodiak Productions LTD | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2014 |
| 231 | Kohler Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 1994 |
| 232 | Kokomo Oil Company | Houston, TX 77227 | Oil & Gas Operator | Apr 1998 |
| 233 | KRF Production Company LLC | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 234 | Ladd Oil & Gas Corporation | Midland, TX 79711 | Oil & Gas Operator | Dec 2021 |
| 235 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 236 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 237 | Lavanco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2006 |
| 238 | Lavanco Energy, LTD. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2024 |
| 239 | Lawbar Petroleum, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Aug 2003 |
| 240 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 241 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 242 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 243 | Lewis, T. K. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Mar 2025 |
| 244 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 245 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 246 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 247 | Lively Energy & Development Corp | Boerne, TX 78015 | Oil & Gas Operator | May 2015 |
| 248 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 249 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 250 | Lone Star Oil & Gas | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 251 | Lone Star Operations LLC | Lubbock, TX 79401 | Oil & Gas Operator | Mar 2025 |
| 252 | Lovelady, I. W. | Albuquerque, NM 87111 | Oil & Gas Operator | Jan 1996 |
| 253 | M5 Standing Energy, LLC | Decatur, TX 76234 | Oil & Gas Operator | Mar 2025 |
| 254 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 255 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 256 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 257 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 258 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 259 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2025 |
| 260 | Mayjac I, LLC | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 261 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Mar 2025 |
| 262 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2025 |
| 263 | McCammon Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Mar 2025 |
| 264 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 265 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 266 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 267 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 268 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Mar 2025 |
| 269 | Meador, T. C. | San Angelo, TX 76902 | Oil & Gas Operator | Mar 2025 |
| 270 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 271 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Mar 2025 |
| 272 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 273 | Merit Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | May 1994 |
| 274 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 275 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 276 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 277 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 278 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 279 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 280 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 281 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 282 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 283 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 284 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 285 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Mar 2025 |
| 286 | Morrow Resources, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2004 |
| 287 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 288 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 289 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 290 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 291 | Naumann Oil & Gas, Inc. | Austin, TX 78716 | Oil & Gas Operator | Mar 2025 |
| 292 | New Atlantis II, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Mar 2025 |
| 293 | New Atlantis Oil & Expl., LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2012 |
| 294 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 295 | Nitro Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 296 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 297 | North Central Casing Pullers,Inc | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 298 | O'Neill Properties, LTD. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 299 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 300 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |