| 301 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 302 | Pennant Dev. And Prod., LLC | Midland, TX 79702 | Oil Operator | Apr 2025 |
| 303 | Pennartz Productions, LLC. | Jacksboro, TX 76458 | Oil Operator | Apr 2025 |
| 304 | Pennington Refining LLC | Grand Prairie, TX 75051 | Oil Operator | Apr 2025 |
| 305 | Pennington, W. L., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 1996 |
| 306 | Penntex Petroleum Corporation | Austin, TX 78731 | Oil & Gas Operator | Apr 2025 |
| 307 | Penntex Resources, L.P. | State College, PA 16803 | Oil & Gas Operator | Mar 2016 |
| 308 | Penny, Ralph E. | White Plains, NY 10601 | Oil & Gas Operator | Jul 2023 |
| 309 | Pennzenergy Exp. & Prod., L.L.C. | Houston, TX 77210 | Oil & Gas Operator | Mar 2000 |
| 310 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 311 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 312 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 313 | Penrod Oil Company Of Texas, Inc | Milano, TX 76556 | Oil & Gas Operator | Apr 2025 |
| 314 | Pentad Development Corp. (A) | Dallas, TX 75201 | Oil & Gas Operator | Mar 1993 |
| 315 | Pentergy Operating, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Apr 2025 |
| 316 | Pentex Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 317 | Pentex Operating Company | Oklahoma City, OK 73132 | Oil & Gas Operator | Oct 1994 |
| 318 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 319 | Penwell South Operating LLC | Houston, TX 77269 | Oil Operator | Apr 2025 |
| 320 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 321 | Percussion Petroleum Oper II,LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2023 |
| 322 | Perdido Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Apr 2025 |
| 323 | Perdure Petroleum LLC | Allen, TX 75013 | Oil & Gas Operator | Oct 2021 |
| 324 | Peregrine Energy, Inc. | Spring, TX 77393 | Oil & Gas Operator | Jul 1999 |
| 325 | Peregrine Petroleum PRTNR, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 326 | Perenco LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 327 | Perez, H. F. | Alice, TX 78332 | Oil & Gas Operator | May 2023 |
| 328 | Performance Operating Partners, LLC | Shreveport, LA 71164 | Oil & Gas Operator | Apr 2025 |
| 329 | Pergerson Energy, L.L.C. | Richmond, VA 23225 | Oil Operator | Apr 2025 |
| 330 | Perimeter Resource Company | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 331 | Periscope Operating LLC | McKinney, TX 75069 | Oil & Gas Operator | Jun 2020 |
| 332 | Perkins, Eugene O. | Boerne, TX 78015 | Oil & Gas Operator | Apr 2025 |
| 333 | Perkins-Prothro Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2002 |
| 334 | Perlman,I.H.Oil & Gas Properties | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 335 | Permex Petroleum Corporation | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 336 | Permian Basin Oil Corporation | Odessa, TX 79762 | Oil & Gas Operator | Apr 2025 |
| 337 | Permian Deep Rock Oil Co., LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 338 | Permian Development, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2008 |
| 339 | Permian Legend LLC | San Marcos, TX 78666 | Oil Operator | Apr 2025 |
| 340 | Permian Natural Resources | Pflugerville, TX 78660 | Oil & Gas Operator | Apr 2025 |
| 341 | Permian Pacific Resources, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Aug 2003 |
| 342 | Permian Resources Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 343 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 344 | Permian Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2018 |
| 345 | Permian Services Co., LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 346 | Permian Solutions LLC | Midland, TX 79702 | Oil Operator | Apr 2025 |
| 347 | Permian Surveys | Midland, TX 79707 | Oil & Gas Operator | Oct 1999 |
| 348 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | Apr 2025 |
| 349 | Permico Corporation | Stafford, TX 77477 | Oil & Gas Operator | Nov 2003 |
| 350 | Perry Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 351 | Perry Producing Company, Inc. | Ackerly, TX 79713 | Oil & Gas Operator | Apr 2025 |
| 352 | Perry, J. R. & Co. | Haskell, TX 79521 | Oil & Gas Operator | Jul 2015 |
| 353 | Perryman Exp. And Prod., LLC | Athens, TX 75751 | Oil & Gas Operator | Apr 2025 |
| 354 | Perryman Operating Company | Athens, TX 75751 | Oil & Gas Operator | Apr 2025 |
| 355 | Perryton Operating Co., Inc. | Perryton, TX 79070 | Oil & Gas Operator | Apr 2025 |
| 356 | Person Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Sep 2002 |
| 357 | Person, Claude | Bowie, TX 76230 | Oil & Gas Operator | Apr 2007 |
| 358 | Person, J.S., Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2025 |
| 359 | Petco Energy Corporation | Hinsdale, IL 60521 | Oil & Gas Operator | Apr 2025 |
| 360 | Petco Petroleum Corp | Hinsdale, IL 60521 | Oil & Gas Operator | Jan 2025 |
| 361 | Petech Enterprises, Inc. | Houston, TX 77066 | Oil & Gas Operator | Jan 2004 |
| 362 | Peters Petroleum Corporation | Dallas, TX 75243 | Oil & Gas Operator | Jan 2014 |
| 363 | Peterson & Roberts | Loving, TX 76460 | Oil & Gas Operator | Mar 1998 |
| 364 | Peterson Oil And Gas LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Apr 2025 |
| 365 | Peterson, Don Company | Loving, TX 76460 | Oil & Gas Operator | Jul 2017 |
| 366 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 367 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 368 | Petralis Energy Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 369 | Petram Oil And Gas, LLC | Richmond, TX 77407 | Oil Operator | Apr 2025 |
| 370 | Petro 2000 Exploration Co. | Katy, TX 77450 | Oil & Gas Operator | Nov 2011 |
| 371 | Petro Delta | Rockdale, TX 76567 | Oil Operator | Apr 2025 |
| 372 | Petro Drilling & Producing Co. | Archer City, TX 76351 | Oil & Gas Operator | Apr 1997 |
| 373 | Petro Hi-Tech, Inc. | Pasadena, TX 77505 | Oil & Gas Operator | Feb 2008 |
| 374 | Petro Lions, LLC | Somerset, TX 78069 | Oil Operator | Apr 2025 |
| 375 | Petro Plex Oil Co Inc. | Homosassa, FL 34448 | Oil & Gas Operator | Jul 2020 |
| 376 | Petro Resources, Inc. | Fulton, TX 78358 | Oil & Gas Operator | Apr 2025 |
| 377 | Petro Ventures Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 378 | Petro Vest, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2014 |
| 379 | Petro-Beth Oil & Gas, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2006 |
| 380 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2025 |
| 381 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 382 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 383 | Petro-Haley | Borger, TX 79008 | Oil & Gas Operator | Apr 2025 |
| 384 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 385 | Petro-Hunt Permian, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 386 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 387 | Petro-Raider LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 388 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Apr 2025 |
| 389 | Petro-Tex Energy & Expl.Co.,Inc. | Llano, TX 78643 | Oil & Gas Operator | Apr 2025 |
| 390 | Petro-West Corporation | Lubbock, TX 79404 | Oil & Gas Operator | Oct 2001 |
| 391 | Petrobal Omega 1, LLC | Little Elm, TX 75068 | Oil & Gas Operator | Apr 2025 |
| 392 | Petrocat Innovations, LLC | Forney, TX 75126 | Oil Operator | Apr 2025 |
| 393 | Petrocoastal, Inc. | Frisco, TX 75036 | Oil & Gas Operator | Apr 2025 |
| 394 | Petrocorp Acquisition Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2002 |
| 395 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 396 | Petrodata Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 397 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Dec 2024 |
| 398 | Petrofunds, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 1996 |
| 399 | Petrogas Energy Services, LLC | Dallas, TX 75214 | Oil Operator | Apr 2025 |
| 400 | Petrogas Operating Corporation | Garland, TX 75043 | Oil Operator | Feb 2010 |