| 301 | Par Minerals Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 302 | Par Oil Corporation | | Oil & Gas Operator | Sep 1990 |
| 303 | Par Oil Corporation, Et Al | | Oil & Gas Operator | Dec 1984 |
| 304 | Pelico Pipeline, LLC | | Oil Operator | Dec 2024 |
| 305 | Pelto Oil Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1998 |
| 306 | Penn Resources, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Sep 1987 |
| 307 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 308 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 309 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 310 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 311 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 312 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 313 | Petro-Management Inc | | Oil Operator | Dec 1998 |
| 314 | Petrocan, Inc. | | Oil & Gas Operator | Apr 1998 |
| 315 | Petrofunds, Inc & Sunny South | | Oil & Gas Operator | Feb 1984 |
| 316 | Petrofunds, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 1996 |
| 317 | Petrofunds, Inc. & Herd | | Oil & Gas Operator | Mar 1984 |
| 318 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 319 | Petroleum Exchange | | Oil & Gas Operator | Oct 1997 |
| 320 | Petroleum Production MGMT., Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Mar 2025 |
| 321 | Petrosil Resources Inc. | | Oil & Gas Operator | Oct 1981 |
| 322 | Phillips Energy, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2018 |
| 323 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 324 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 325 | Phoenix - Comco, Inc. | | Oil Operator | Aug 2004 |
| 326 | Phoenix Oper Co Inc-New Amer | | Oil Operator | Jul 1994 |
| 327 | Phoenix Operating Company, Inc. | Shreveport, LA 71161 | Oil & Gas Operator | Mar 2015 |
| 328 | Phoenix Opr Co Inc-Acc | | Oil Operator | Dec 1992 |
| 329 | Phoenix Opr Co Inc-Broadway | | Oil Operator | Dec 1992 |
| 330 | Phoenix Opr Co Inc-Nac | | Oil Operator | Dec 1992 |
| 331 | Phoenix Opr Co Inc-New Amer 85 | | Oil Operator | Dec 1992 |
| 332 | Phoenix Opr Co Inc-Petrovest | | Oil Operator | Dec 1992 |
| 333 | Phoenix Opr Co Inc-RBF 1985 | | Oil Operator | Dec 1992 |
| 334 | Phoenix Opr Co Inc-Shemen | | Oil Operator | Dec 1992 |
| 335 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Mar 2025 |
| 336 | Placid Oil Co., Et Al | | Oil & Gas Operator | Jun 1983 |
| 337 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 338 | Plantation Oil Company | | Oil Operator | Dec 2006 |
| 339 | Ploutos, LLC | | Oil Operator | May 2021 |
| 340 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 341 | Pride Exploration, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2015 |
| 342 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Dec 2024 |
| 343 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 344 | Quantum Resources MGMT, LLC | | Oil & Gas Operator | Nov 2014 |
| 345 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 346 | Rabalais Oil And Gas, Inc. | | Oil & Gas Operator | Sep 2023 |
| 347 | Rabwin Oil & Gas, Inc. | | Oil & Gas Operator | Nov 1991 |
| 348 | Range Louisiana Operating, LLC | | Oil & Gas Operator | Aug 2020 |
| 349 | Reeder Production | | Oil Operator | Oct 2005 |
| 350 | Regency Field Services LLC | Dallas, TX 75201 | Oil Operator | Jul 2017 |
| 351 | Regency Gas Gathrng & Proc LLC | | Oil Operator | Sep 2007 |
| 352 | Reliance Energy, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 353 | Reliance Well Service, Inc. | | Oil & Gas Operator | Apr 1997 |
| 354 | Reliant Energy Field SVS Inc. | | Oil Operator | Sep 2002 |
| 355 | Reserve Oil Inc. | | Oil & Gas Operator | Jan 1980 |
| 356 | Reynolds Drill Coinc/Rosbottom | | Oil & Gas Operator | Jan 1990 |
| 357 | Reynolds Drilling Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Mar 2025 |
| 358 | Reynolds E & P, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Mar 2025 |
| 359 | Rigel Resources Co., Inc. | | Oil Operator | Aug 2009 |
| 360 | Riverstone Energy Operating, LLC | Houston, TX 77090 | Oil & Gas Operator | Mar 2025 |
| 361 | Rosbottom Production Corp | Shreveport, LA 71134 | Oil & Gas Operator | Dec 2017 |
| 362 | Rosestone Operating Company, LLC | | Oil & Gas Operator | Dec 2024 |
| 363 | Rudman Resources, Inc. | | Oil Operator | Jul 1981 |
| 364 | Rusk Energy Management, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 365 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 366 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 367 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 368 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 369 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 370 | Sandhill Production Inc | Shongaloo, LA 71072 | Oil & Gas Operator | Dec 2019 |
| 371 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 372 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 373 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 374 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 375 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 376 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 377 | Shongaloo Midstream, LLC | | Oil Operator | Mar 2019 |
| 378 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Sep 2024 |
| 379 | Sierra Industries, Inc. | | Oil & Gas Operator | Apr 1989 |
| 380 | Simpson Well Service, Inc. | | Oil Operator | Dec 1996 |
| 381 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 382 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 383 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 384 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Mar 2025 |
| 385 | Smackover Drilling Company Inc | Shreveport, LA 71104 | Oil & Gas Operator | Jul 2024 |
| 386 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 387 | SMR Natural Gas Ventures Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 1999 |
| 388 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 389 | Southwest Operating Inc. | | Oil & Gas Operator | Dec 2024 |
| 390 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 391 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 392 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 393 | Steaua Romana (Us) Inc. | | Oil & Gas Operator | Apr 1987 |
| 394 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Mar 2025 |
| 395 | Story Oil And Gas Inc | Magnolia, AR 71753 | Oil & Gas Operator | Dec 2024 |
| 396 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 397 | Striper Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Apr 2002 |
| 398 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Mar 2025 |
| 399 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 400 | STZ Petroleum Inc. | Houston, TX 77268 | Oil & Gas Operator | Dec 1997 |