| 201 | Icarus Operating Corporation | Spring, TX 77393 | Oil & Gas Operator | Mar 2025 |
| 202 | Ineos USA Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 203 | Ingram, J. Oil & Gas, Inc. | Plano, TX 75074 | Oil & Gas Operator | Mar 2025 |
| 204 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 205 | Ipt Oil Company | Evansville, IN 47706 | Oil & Gas Operator | Mar 2025 |
| 206 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Mar 2025 |
| 207 | Jab Operating, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2008 |
| 208 | Javelin Energy Partners Management, LLC | Irving, TX 75038 | Oil & Gas Operator | Mar 2025 |
| 209 | JB Oil & Gas Well Service | Dilley, TX 78017 | Oil & Gas Operator | Mar 2025 |
| 210 | Jenkins Oil Corporation | Hankamer, TX 77560 | Oil & Gas Operator | Mar 2008 |
| 211 | Jennings Exploration Company | Beeville, TX 78102 | Oil & Gas Operator | Feb 2024 |
| 212 | JL Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 213 | Kachina Oil & Gas Inc. | Austin, TX 78766 | Oil & Gas Operator | Jul 2002 |
| 214 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 215 | Keft Oil Company | Pleasanton, TX 78064 | Oil & Gas Operator | Feb 2003 |
| 216 | Kerns O & G, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2004 |
| 217 | Kerns Petroleum, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Sep 2013 |
| 218 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jan 2025 |
| 219 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 220 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 221 | Killam Oil Co., LTD. | Laredo, TX 78042 | Oil & Gas Operator | Mar 2025 |
| 222 | Killam Oil Company | Laredo, TX 78042 | Oil & Gas Operator | Mar 1994 |
| 223 | Kinlaw Oil Corporation | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 224 | Klutts, Carlos J. | Austin, TX 78711 | Oil & Gas Operator | Apr 2002 |
| 225 | Koven Production Co. | San Antonio, TX 78232 | Oil & Gas Operator | Aug 2003 |
| 226 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 227 | L & J Exploration, LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2025 |
| 228 | L.T.D. Explorations Inc. | Alice, TX 78333 | Oil & Gas Operator | Mar 2025 |
| 229 | Lane, Lloyd L. | Buffalo, TX 75831 | Oil Operator | Mar 2025 |
| 230 | Larron Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2015 |
| 231 | Legend Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2010 |
| 232 | Lewis Petro Properties, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 233 | Lightning Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 234 | Little, Quintin Company,Inc.,The | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2025 |
| 235 | LMP Petroleum, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Jan 2010 |
| 236 | Lone Star Operating Company | Pearsall, TX 78061 | Oil & Gas Operator | Mar 2025 |
| 237 | Lonestar Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 238 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 239 | Lovelady, I. W. | Albuquerque, NM 87111 | Oil & Gas Operator | Jan 1996 |
| 240 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 241 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 242 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 243 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 244 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 245 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 246 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 247 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 248 | McCombs Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2006 |
| 249 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 250 | McDay Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 251 | MCR Operating Group | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 252 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 253 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 254 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 255 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 256 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2025 |
| 257 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 258 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 259 | Mobile Production Systems, Inc. | Austin, TX 78711 | Oil & Gas Operator | Feb 1995 |
| 260 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 261 | Murphy Expl. & Prod. Co. - USA | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 262 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 263 | Murphy Exploration & Production | Houston, TX 77024 | Oil Operator | Oct 2024 |
| 264 | Nails Operating Company LLC | Hondo, TX 78861 | Oil Operator | Mar 2025 |
| 265 | Navajo Exploration, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Mar 2025 |
| 266 | Nelms Bros. Oil Properties Inc. | Austin, TX 78711 | Oil & Gas Operator | Jun 1996 |
| 267 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 268 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 269 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 270 | Null, W.M. Operations, Inc. | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Jun 2002 |
| 271 | Oil, Gas, Etc. LLC | Katy, TX 77449 | Oil & Gas Operator | Mar 2025 |
| 272 | Oilton Resources, Inc. | Laredo, TX 78041 | Oil & Gas Operator | Mar 2025 |
| 273 | Omni Operating Company(A) | Dallas, TX 75370 | Oil & Gas Operator | Mar 2025 |
| 274 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | Mar 2025 |
| 275 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 276 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 277 | Osborne Oil Co. | Dallas, TX 75244 | Oil & Gas Operator | Aug 2003 |
| 278 | Overly Operating Co. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |
| 279 | Overstreet, Jamie L | Hondo, TX 78861 | Oil & Gas Operator | Mar 2025 |
| 280 | Oxson Co. | Uvalde, TX 78802 | Gas Operator | Mar 2025 |
| 281 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 282 | Pacific Operators, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Mar 1999 |
| 283 | Patterson Energy Corporation | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 284 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 285 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 286 | Payrock II, LLC | Houston, TX 77007 | Oil & Gas Operator | Dec 2020 |
| 287 | Pendragon Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 288 | Penrod Oil Company Of Texas, Inc | Milano, TX 76556 | Oil & Gas Operator | Mar 2025 |
| 289 | Petronomics, Inc. | Houston, TX 77074 | Oil & Gas Operator | Aug 2003 |
| 290 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Mar 2025 |
| 291 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 292 | Phoenix Fund, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2000 |
| 293 | Picosa, L.L.C. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2025 |
| 294 | Plains Marketing, LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 295 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 296 | Plo'S Oil & Gas | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2025 |
| 297 | Premier Minerals, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 298 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 299 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 300 | Protege Energy III LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |