| 201 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 202 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Jul 2025 |
| 203 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | Jul 2025 |
| 204 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 205 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 206 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 207 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 208 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 209 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Jul 2025 |
| 210 | Heart Land Petroleum Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 211 | Herring, Ray | Graham, TX 76450 | Oil & Gas Operator | Jul 2014 |
| 212 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | 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 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 216 | HMH Operators, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 217 | Holliday CSG Corp. | Holliday, TX 76366 | Oil & Gas Operator | Jul 2025 |
| 218 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 219 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 220 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 221 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 222 | Humphrey-Bashford Oil, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2010 |
| 223 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |
| 224 | Ice Well Services, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Jul 2025 |
| 225 | Ikard, Alan | Electra, TX 76360 | Oil & Gas Operator | Jul 2025 |
| 226 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 227 | JJH Prod. Co. | Roby, TX 79543 | Oil & Gas Operator | Jul 2025 |
| 228 | Jones Company, LTD. | Albany, TX 76430 | Oil & Gas Operator | May 1999 |
| 229 | Jordan Engineering, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jul 2025 |
| 230 | Joy Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Jul 2025 |
| 231 | K. O. C. Corporation | Sherman, TX 75091 | Oil & Gas Operator | Jul 2025 |
| 232 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 233 | Katz Oil Co. | San Antonio, TX 78218 | Oil & Gas Operator | Dec 2002 |
| 234 | Kelt Oil & Gas, Inc. | Torrance, CA 90503 | Oil & Gas Operator | Dec 2003 |
| 235 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Apr 2025 |
| 236 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 237 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 238 | Kinder Morgan Co2 Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 239 | Kinder Morgan Production Co LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 240 | Kinder Morgan Production Co LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2007 |
| 241 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 242 | Ko Operating | Merkel, TX 79536 | Oil & Gas Operator | Jul 2025 |
| 243 | Korman Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2001 |
| 244 | Kroh Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 245 | Kuehne Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 246 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 247 | Lainco Well Service, Inc. | Hamlin, TX 79520 | Oil & Gas Operator | Aug 2011 |
| 248 | Lainco, Inc. | Hamlin, TX 79520 | Oil & Gas Operator | Jul 2025 |
| 249 | Landrum West, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 1997 |
| 250 | Lane Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 2025 |
| 251 | Laneer Resources Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 252 | Lapco Oil & Gas Company | Houston, TX 77069 | Oil & Gas Operator | Oct 2015 |
| 253 | Larance Engineering Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Jan 1996 |
| 254 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 255 | Laroca Resources, LTD | Austin, TX 78709 | Oil & Gas Operator | Jul 2025 |
| 256 | Lawlis Oil Company | Hamlin, TX 79520 | Oil & Gas Operator | Jul 2025 |
| 257 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Jul 2025 |
| 258 | Leclair Operating, L.L.C. | Abilene, TX 79602 | Oil & Gas Operator | Jul 2025 |
| 259 | Leffel'S, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2020 |
| 260 | Lewis, James B. Land & Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Nov 1998 |
| 261 | Liberty Operating Company, Inc. | Lake Dallas, TX 75065 | Oil & Gas Operator | Mar 2008 |
| 262 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 263 | Lodi Drilling & Service Co. | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Jul 2025 |
| 264 | Lodi Operating Company LLC | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Jul 2025 |
| 265 | Lone Star Operations LLC | Lubbock, TX 79401 | Oil & Gas Operator | Jul 2025 |
| 266 | Lone Star Pipeline Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 267 | Lone Star Production | Lawn, TX 79530 | Oil & Gas Operator | Jul 2025 |
| 268 | Lovelady, I. W. | Albuquerque, NM 87111 | Oil & Gas Operator | Jan 1996 |
| 269 | Lytle Creek Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Jul 2025 |
| 270 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 271 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 272 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 273 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 274 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 275 | Martin Oil LLC | Madison, KS 66860 | Oil Operator | Mar 2025 |
| 276 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 277 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 278 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Jul 2025 |
| 279 | McKenney & Chambers Oil Company | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2003 |
| 280 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Jul 2025 |
| 281 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 282 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 283 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2025 |
| 284 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 285 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 286 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 287 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 288 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 289 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 290 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 291 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 292 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 293 | MWL Energy LLC | Hamlin, TX 79520 | Oil Operator | Jul 2025 |
| 294 | Neatherlin, Earl Inc. | Avoca, TX 79503 | Oil & Gas Operator | Jul 2025 |
| 295 | New Atlantis II, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 296 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 297 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 298 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 299 | Norwood, A. N., Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 300 | Nosivad Oil, Inc. | Clyde, TX 79510 | Oil & Gas Operator | Jul 2025 |