| 201 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 202 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | May 2025 |
| 203 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 204 | Kindee Oil & Gas Texas, LLC | Houston, TX 77084 | Oil & Gas Operator | Apr 2016 |
| 205 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 206 | L & B Production | Big Lake, TX 76932 | Oil & Gas Operator | May 2025 |
| 207 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 208 | Lawco Osage Operating, LLC | Bentonville, AR 72712 | Oil & Gas Operator | May 2025 |
| 209 | Leclair Operating, L.L.C. | Abilene, TX 79602 | Oil & Gas Operator | May 2025 |
| 210 | Lep Development Company, LLC | Houston, TX 77007 | Oil & Gas Operator | Jul 2020 |
| 211 | LGDC Corporation | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 212 | Liberty Operating Company, Inc. | Lake Dallas, TX 75065 | Oil & Gas Operator | Mar 2008 |
| 213 | Light Resources | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2013 |
| 214 | Litchfield Production Co. | Nederland, TX 77627 | Oil & Gas Operator | May 2025 |
| 215 | Locin Oil Corporation | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 216 | Lozano Oil Company Inc. | Houston, TX 77082 | Oil & Gas Operator | May 2025 |
| 217 | Magic Oil & Gas Inc. | Houston, TX 77079 | Oil & Gas Operator | Jan 2001 |
| 218 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 219 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 220 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | May 2025 |
| 221 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | May 2025 |
| 222 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 223 | Matco Oil Co. | Saratoga, TX 77585 | Oil & Gas Operator | Apr 1999 |
| 224 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Apr 2025 |
| 225 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 226 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 227 | Meason Operating Company | Natchez, MS 39121 | Oil & Gas Operator | Dec 2011 |
| 228 | Medallion Oil Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2012 |
| 229 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 230 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 231 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 232 | Milestone Operating, Inc. | Montgomery, TX 77316 | Oil & Gas Operator | May 2025 |
| 233 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 234 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 235 | Moose Oil & Gas Co. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 236 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 237 | Mosman Operating, LLC | Dallas, TX 75204 | Oil Operator | May 2025 |
| 238 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 239 | Murphy Energy Services, LP | Saratoga, TX 77585 | Oil Operator | Dec 2018 |
| 240 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 241 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 242 | Natural Reserves Group, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1993 |
| 243 | Neches Transport Inc. | Spurger, TX 77660 | Oil & Gas Operator | May 2025 |
| 244 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 245 | Newton, W. F. | Conroe, TX 77305 | Oil & Gas Operator | Jun 1994 |
| 246 | Newton, W. F. Estate Of | Conroe, TX 77305 | Oil & Gas Operator | Jan 2000 |
| 247 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 248 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 249 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | May 2025 |
| 250 | Nueces Petroleum Corporation | Sugar Land, TX 77496 | Oil Operator | May 2025 |
| 251 | Odegard Energy, Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2020 |
| 252 | Oil Well Buyers Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 253 | Old Timers Oil | Saratoga, TX 77585 | Oil & Gas Operator | Nov 2014 |
| 254 | Old Timers Oil Company, LLC | Saratoga, TX 77585 | Oil Operator | Aug 2022 |
| 255 | Old Timers Oil No. 2 Incorporated | Saratoga, TX 77585 | Oil Operator | May 2025 |
| 256 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 257 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 258 | Omega Energy, LLC | Corpus Chrsti, TX 78418 | Oil & Gas Operator | May 2025 |
| 259 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 260 | Orisol Oil Co. | Houston, TX 77206 | Oil Operator | Jun 2000 |
| 261 | Otex Resources LLC | Baytown, TX 77520 | Oil & Gas Operator | May 2025 |
| 262 | P & WG Resources L.L.C. | Batson, TX 77519 | Oil & Gas Operator | Jan 2011 |
| 263 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 264 | Pathfinder Exploration LLC | Norman, OK 73069-8516 | Gas Operator | Aug 2003 |
| 265 | Pecos Petroleum Company | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 266 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 267 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 268 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 269 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 270 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 271 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | May 2025 |
| 272 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jan 2025 |
| 273 | Petroleum Resource Management Co | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 274 | Petronomics, Inc. | Houston, TX 77074 | Oil & Gas Operator | Aug 2003 |
| 275 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 276 | Pittencrieff (Gulf Coast), Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1998 |
| 277 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 278 | Placid Operating, LLC | Dallas, TX 75230 | Oil & Gas Operator | Jul 2021 |
| 279 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 280 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 281 | Porter, James W. | Houston, TX 77240 | Oil & Gas Operator | Oct 1993 |
| 282 | Porter, James W. Special | Blanco, TX 78606 | Oil & Gas Operator | May 2025 |
| 283 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | May 2025 |
| 284 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2025 |
| 285 | Primrose Resources, LLC | Cedar Park, TX 78630 | Oil & Gas Operator | May 2025 |
| 286 | Pyramid Exploration | Houston, TX 77241 | Oil & Gas Operator | Sep 1995 |
| 287 | Quail Creek Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 288 | Quintana Pet. Corp. | Refugio, TX 78377 | Oil & Gas Operator | Dec 2000 |
| 289 | R & B Oil Company, LLC | Willis, TX 77318 | Oil & Gas Operator | May 2025 |
| 290 | Radco Operations | Sourlake, TX 77659 | Oil Operator | Nov 2002 |
| 291 | Radco Operations, L.P. | Sourlake, TX 77659 | Oil Operator | May 2025 |
| 292 | Radley Electric, Inc. | Sourlake, TX 77659 | Oil & Gas Operator | Oct 2001 |
| 293 | Radley Equipment | Sourlake, TX 77659 | Oil & Gas Operator | May 2000 |
| 294 | Radley, R. R. | Sourlake, TX 77659 | Oil & Gas Operator | Mar 2008 |
| 295 | Radley, Terry R., Operator | Sourlake, TX 77659 | Oil & Gas Operator | Apr 2006 |
| 296 | Rainbow Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Nov 2002 |
| 297 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 298 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | May 2025 |
| 299 | Rein Pusher Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | May 2025 |
| 300 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | May 2025 |