| 301 | Panther Creek Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2012 |
| 302 | Paradis Investments, L.L.C. | Bellaire, TX 77401 | Oil Operator | Jun 2020 |
| 303 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 304 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 305 | Parkway Petroleum, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 306 | Partners Production, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Apr 2026 |
| 307 | Patterson Energy Corporation | Dallas, TX 75367 | Oil & Gas Operator | Apr 2026 |
| 308 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 309 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 310 | Patton Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 311 | Pavlas Oil & Gas | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2026 |
| 312 | Pendragon Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2026 |
| 313 | Penrod Oil Company Of Texas, Inc | Milano, TX 76556 | Oil & Gas Operator | Apr 2026 |
| 314 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | Apr 2026 |
| 315 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 316 | Petro Delta | Rockdale, TX 76567 | Oil Operator | Apr 2026 |
| 317 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 318 | Pgo, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jun 1999 |
| 319 | Pharaoh & Associates, Inc. | Houston, TX 77252 | Oil & Gas Operator | Aug 2002 |
| 320 | Pierce Operating Company, L.L.C. | Bryan, TX 77808 | Oil & Gas Operator | Dec 2018 |
| 321 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2026 |
| 322 | Placer Oil Co. | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2008 |
| 323 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 324 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 325 | Poff, H. Bryan | Fort Worth, TX 76103 | Oil & Gas Operator | Mar 2008 |
| 326 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Apr 2026 |
| 327 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 328 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2026 |
| 329 | Producers Engineering Company | Destin, FL 32541 | Oil & Gas Operator | Sep 1999 |
| 330 | Progenies Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2026 |
| 331 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2026 |
| 332 | Proven Natural Resources LLC | Canton, TX 75103 | Oil & Gas Operator | Apr 2026 |
| 333 | Quanico Oil & Gas, Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Apr 2026 |
| 334 | R & C Petroleum, Inc. | Flint, TX 75762 | Oil & Gas Operator | Apr 2026 |
| 335 | R & S Energy, Inc. | Snook, TX 77878 | Oil & Gas Operator | Apr 2026 |
| 336 | R&R Resources Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 337 | Radius Operating, LLC | Round Rock, TX 78664 | Oil & Gas Operator | Apr 2026 |
| 338 | Ram Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2012 |
| 339 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 340 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2026 |
| 341 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 342 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 343 | Raymond, WM. C. | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2026 |
| 344 | Red Chalk Resources LLC | Houston, TX 77218 | Oil Operator | Apr 2026 |
| 345 | Red Hills Energy, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2025 |
| 346 | Red Water Resources, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Apr 2026 |
| 347 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Apr 2026 |
| 348 | Redco Oil & Gas, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Apr 2026 |
| 349 | Redwood Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 350 | Rego Development Company, Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | Apr 2002 |
| 351 | Rein Pusher Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Apr 2026 |
| 352 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Apr 2026 |
| 353 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Apr 2026 |
| 354 | Reserve Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Mar 2008 |
| 355 | Retamco Operating Inc | Red Lodge, MT 59068 | Oil & Gas Operator | Jan 2026 |
| 356 | Rme Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2002 |
| 357 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 358 | Robert T. Epperson Prod Co, LLC | Tyler, TX 75713 | Gas Operator | Dec 2017 |
| 359 | Rosenthal, Stanley H. | Bay City, TX 77404 | Oil & Gas Operator | Dec 2020 |
| 360 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 361 | Ross Operating Company | Shreveport, LA 71163 | Oil & Gas Operator | May 1996 |
| 362 | Rumble Energy LLC | Skiatook, OK 74070 | Oil & Gas Operator | Apr 2026 |
| 363 | Rusk Energy Operating LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2026 |
| 364 | Rwa Corporation | Houston, TX 77024 | Oil & Gas Operator | Sep 1999 |
| 365 | Ryann Operating, LLC | Waller, TX 77484 | Oil & Gas Operator | Apr 2026 |
| 366 | S & JB, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Jul 2010 |
| 367 | S&JB, LLC | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2026 |
| 368 | Sabalo Operating, LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jun 2021 |
| 369 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Apr 2026 |
| 370 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 371 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 372 | San Dia Producing Company | Deanville, TX 77852 | Oil & Gas Operator | Apr 2026 |
| 373 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 374 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 375 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 376 | SBJ Energy Partners, L.L.C. | Waco, TX 76710 | Oil & Gas Operator | Apr 2026 |
| 377 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 378 | Seguro Well Service, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Apr 2026 |
| 379 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Apr 2026 |
| 380 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 381 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Apr 2026 |
| 382 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2026 |
| 383 | Shoreham Oil & Gas Company, Inc. | Katy, TX 77492 | Oil & Gas Operator | Apr 2026 |
| 384 | Sierra Minerals, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2026 |
| 385 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 386 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2026 |
| 387 | Silver Tusk Operating Co. LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2018 |
| 388 | Skytop Oil & Gas | Giddings, TX 78942 | Oil & Gas Operator | Apr 2026 |
| 389 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 390 | Smith Brothers Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 391 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 392 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 393 | South Forty Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Oct 1993 |
| 394 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 395 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Apr 2026 |
| 396 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 397 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 398 | Square One Corporation | Giddings, TX 78942 | Oil & Gas Operator | Dec 2012 |
| 399 | Standard Resources Corp. | Houston, TX 77063 | Oil & Gas Operator | Apr 2026 |
| 400 | Stanton Mineral Development Inc | Austin, TX 78759 | Oil & Gas Operator | Apr 2026 |