| 201 | Jenex Petroleum Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 202 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 203 | Kelpetro, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2012 |
| 204 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 205 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 206 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 207 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Mar 2025 |
| 208 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 209 | Kindee Oil & Gas Texas, LLC | Houston, TX 77084 | Oil & Gas Operator | Apr 2016 |
| 210 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 211 | L & B Production | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2025 |
| 212 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 213 | Lawco Osage Operating, LLC | Bentonville, AR 72712 | Oil & Gas Operator | Mar 2025 |
| 214 | Leclair Operating, L.L.C. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 215 | Lep Development Company, LLC | Houston, TX 77007 | Oil & Gas Operator | Jul 2020 |
| 216 | LGDC Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 217 | Liberty Operating Company, Inc. | Lake Dallas, TX 75065 | Oil & Gas Operator | Mar 2008 |
| 218 | Light Resources | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2013 |
| 219 | Litchfield Production Co. | Nederland, TX 77627 | Oil & Gas Operator | Mar 2025 |
| 220 | Locin Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 221 | Lozano Oil Company Inc. | Houston, TX 77082 | Oil & Gas Operator | Mar 2025 |
| 222 | Magic Oil & Gas Inc. | Houston, TX 77079 | Oil & Gas Operator | Jan 2001 |
| 223 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 224 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 225 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Mar 2025 |
| 226 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Mar 2025 |
| 227 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 228 | Matco Oil Co. | Saratoga, TX 77585 | Oil & Gas Operator | Apr 1999 |
| 229 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Feb 2025 |
| 230 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 231 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 232 | Meason Operating Company | Natchez, MS 39121 | Oil & Gas Operator | Dec 2011 |
| 233 | Medallion Oil Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2012 |
| 234 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 235 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 236 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 237 | Milestone Operating, Inc. | Montgomery, TX 77316 | Oil & Gas Operator | Mar 2025 |
| 238 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 239 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 240 | Moose Oil & Gas Co. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 241 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 242 | Mosman Operating, LLC | Dallas, TX 75204 | Oil Operator | Mar 2025 |
| 243 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 244 | Murphy Energy Services, LP | Saratoga, TX 77585 | Oil Operator | Dec 2018 |
| 245 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 246 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 247 | Natural Reserves Group, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1993 |
| 248 | Neches Transport Inc. | Spurger, TX 77660 | Oil & Gas Operator | Mar 2025 |
| 249 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 250 | Newton, W. F. | Conroe, TX 77305 | Oil & Gas Operator | Jun 1994 |
| 251 | Newton, W. F. Estate Of | Conroe, TX 77305 | Oil & Gas Operator | Jan 2000 |
| 252 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 253 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 254 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Mar 2025 |
| 255 | Nueces Petroleum Corporation | Sugar Land, TX 77496 | Oil Operator | Mar 2025 |
| 256 | Odegard Energy, Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2020 |
| 257 | Oil Well Buyers Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 258 | Old Timers Oil | Saratoga, TX 77585 | Oil & Gas Operator | Nov 2014 |
| 259 | Old Timers Oil Company, LLC | Saratoga, TX 77585 | Oil Operator | Aug 2022 |
| 260 | Old Timers Oil No. 2 Incorporated | Saratoga, TX 77585 | Oil Operator | Mar 2025 |
| 261 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Mar 2025 |
| 262 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 263 | Omega Energy, LLC | Corpus Chrsti, TX 78418 | Oil & Gas Operator | Mar 2025 |
| 264 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 265 | Orisol Oil Co. | Houston, TX 77206 | Oil Operator | Jun 2000 |
| 266 | Otex Resources LLC | Baytown, TX 77520 | Oil & Gas Operator | Mar 2025 |
| 267 | P & WG Resources L.L.C. | Batson, TX 77519 | Oil & Gas Operator | Jan 2011 |
| 268 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 269 | Pathfinder Exploration LLC | Norman, OK 73069-8516 | Gas Operator | Aug 2003 |
| 270 | Pecos Petroleum Company | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 271 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 272 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 273 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 274 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 275 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 276 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Mar 2025 |
| 277 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Nov 2024 |
| 278 | Petroleum Resource Management Co | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 279 | Petronomics, Inc. | Houston, TX 77074 | Oil & Gas Operator | Aug 2003 |
| 280 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 281 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 282 | Pittencrieff (Gulf Coast), Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1998 |
| 283 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 284 | Placid Operating, LLC | Dallas, TX 75230 | Oil & Gas Operator | Jul 2021 |
| 285 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 286 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 287 | Porter, James W. | Houston, TX 77240 | Oil & Gas Operator | Oct 1993 |
| 288 | Porter, James W. Special | Blanco, TX 78606 | Oil & Gas Operator | Mar 2025 |
| 289 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | Mar 2025 |
| 290 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 291 | Primrose Resources, LLC | Cedar Park, TX 78630 | Oil & Gas Operator | Mar 2025 |
| 292 | Pyramid Exploration | Houston, TX 77241 | Oil & Gas Operator | Sep 1995 |
| 293 | Quail Creek Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 294 | Quintana Pet. Corp. | Refugio, TX 78377 | Oil & Gas Operator | Dec 2000 |
| 295 | R & B Oil Company, LLC | Willis, TX 77318 | Oil & Gas Operator | Mar 2025 |
| 296 | Radco Operations | Sourlake, TX 77659 | Oil Operator | Nov 2002 |
| 297 | Radco Operations, L.P. | Sourlake, TX 77659 | Oil Operator | Mar 2025 |
| 298 | Radley Electric, Inc. | Sourlake, TX 77659 | Oil & Gas Operator | Oct 2001 |
| 299 | Radley Equipment | Sourlake, TX 77659 | Oil & Gas Operator | May 2000 |
| 300 | Radley, R. R. | Sourlake, TX 77659 | Oil & Gas Operator | Mar 2008 |