| 201 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 202 | Kimbell Oil Company Of Texas | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 203 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 204 | Kraker & Martin Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 205 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 206 | Lacy, F. B. Inc. | Houston, TX 77055 | Oil & Gas Operator | Sep 1997 |
| 207 | Lacy, R., Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2002 |
| 208 | Laddex, LTD. | Amarillo, TX 79102 | Oil & Gas Operator | May 2025 |
| 209 | Lake Ronel Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Jul 2017 |
| 210 | Lazarus Operating, LLC | Kilgore, TX 75663 | Oil Operator | May 2025 |
| 211 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | May 2025 |
| 212 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 213 | Lehnertz, G. M. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1998 |
| 214 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 215 | Linder, John G. Jr. | Gladewater, TX 75647 | Oil & Gas Operator | Apr 2005 |
| 216 | Linder, John Operating Co., LLC | Gladewater, TX 75647 | Oil & Gas Operator | May 2025 |
| 217 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 218 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 219 | Little & Whyte Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2008 |
| 220 | Llog Exploration Texas, L.P. | Covington, LA 70433 | Oil & Gas Operator | May 2025 |
| 221 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 222 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 223 | Lorac, Inc. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 224 | Lyne Energy Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 225 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 226 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 227 | Maertins Production, LLC | Queen City, TX 75572 | Oil Operator | May 2025 |
| 228 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 229 | Magnum Hunter Production, Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2019 |
| 230 | Mahfouz Energy Company | Houston, TX 77255 | Oil & Gas Operator | Nov 2020 |
| 231 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 232 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 233 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 234 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 235 | McBride, Jerrel L Enterprise Inc | Kilgore, TX 75663 | Oil & Gas Operator | Jun 1999 |
| 236 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 237 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 238 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 239 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 240 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 241 | Miller Energy Inc | Houston, TX 77024 | Oil & Gas Operator | Oct 2016 |
| 242 | Miller, R. A. Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 243 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 244 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 245 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 246 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 247 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 248 | Murphy, K. P. Oil Operator | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 249 | Mustang Drilling, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Aug 2024 |
| 250 | Mustang Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2006 |
| 251 | Navidad Resources, LLC | Bullard, TX 75757 | Oil & Gas Operator | May 2025 |
| 252 | Neff, Harold & Associates, Inc. | Tyler, TX 75702 | Oil & Gas Operator | May 2008 |
| 253 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | May 2025 |
| 254 | Newcastle Resources, LLC | Tyler, TX 75711 | Oil & Gas Operator | Aug 2015 |
| 255 | NFR Energy, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2017 |
| 256 | Nolte, Mike E., Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2006 |
| 257 | Noonday Exploration, LLC | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 258 | North American Reserve Corp. | Houston, TX 77060 | Oil & Gas Operator | Oct 2010 |
| 259 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 260 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 261 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 262 | Oak Energy, LLC | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 263 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 264 | Oklahoma RB Operating Company | Midland, TX 79701 | Oil & Gas Operator | Jan 1998 |
| 265 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 266 | Ops Group Limited | Houston, TX 77060 | Oil & Gas Operator | Jun 2014 |
| 267 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 268 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 269 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 270 | Palrich Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Apr 2004 |
| 271 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 272 | Panola Corporation, The | Dallas, TX 75252 | Oil & Gas Operator | Sep 2002 |
| 273 | Penn Resources, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Sep 1987 |
| 274 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 275 | Perdido Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | May 2025 |
| 276 | Permian Natural Resources | Pflugerville, TX 78660 | Oil & Gas Operator | May 2025 |
| 277 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | May 2025 |
| 278 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | May 2025 |
| 279 | Petralis Energy Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 280 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 281 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 282 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 283 | Phillips Energy, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2018 |
| 284 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 285 | Phillips, Jack L. | Gladewater, TX 75647 | Oil & Gas Operator | Dec 1997 |
| 286 | Phillips, Jack L. Co. | Gladewater, TX 75647 | Oil & Gas Operator | May 2025 |
| 287 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 288 | Phylko Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 289 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jul 2024 |
| 290 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | May 2025 |
| 291 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 292 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | May 2025 |
| 293 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | May 2025 |
| 294 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | May 2025 |
| 295 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2025 |
| 296 | R & C Petroleum, Inc. | Flint, TX 75762 | Oil & Gas Operator | May 2025 |
| 297 | R. Lacy Services, LTD. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 298 | Rawlins Operating Company, LLC | Elkhart, TX 75839 | Oil & Gas Operator | May 2025 |
| 299 | Redmon Oil Company, Inc., The | Plano, TX 75023 | Oil & Gas Operator | May 2025 |
| 300 | Regal Energy Operating, L.L.C. | Plano, TX 75024 | Oil & Gas Operator | May 2025 |