| 301 | Oky Investments, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Sep 2021 |
| 302 | Olmos Partners, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2026 |
| 303 | Olsen Energy Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2026 |
| 304 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 305 | Omega Energy, LLC | Corpus Chrsti, TX 78418 | Oil & Gas Operator | Feb 2026 |
| 306 | Origin Prod Co Gonzales Prop LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Feb 2026 |
| 307 | Origin Production Company, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Feb 2026 |
| 308 | Origin Production Group LLC | Luling, TX 78648 | Oil Operator | Feb 2026 |
| 309 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 310 | Osyka Oil & Gas, Inc. | Metairie, LA 70004 | Oil & Gas Operator | Feb 2026 |
| 311 | P-R-O Management, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 312 | P.S.N. Petroleum, Inc. | San Antonio, TX 78233 | Oil & Gas Operator | Feb 2026 |
| 313 | P1 Energy, LLC | Judson, TX 75660 | Oil & Gas Operator | Feb 2026 |
| 314 | Pace Oil And Gas Company | Austin, TX 78715 | Oil & Gas Operator | Feb 2026 |
| 315 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 316 | Peach Creek Operating Co, LLC | Houston, TX 77018 | Oil & Gas Operator | Feb 2026 |
| 317 | Pedeco, Inc. | Casper, WY 82601 | Oil & Gas Operator | Mar 2008 |
| 318 | Pendragon Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 319 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 320 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 321 | Perimeter Resource Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 322 | Permian Resources Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 323 | Permian Solutions LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 324 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2026 |
| 325 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 326 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 327 | Petrogas Operating Corporation | Garland, TX 75043 | Oil Operator | Feb 2010 |
| 328 | Petrox Resources Inc | Meeker, CO 81641 | Oil & Gas Operator | Dec 2025 |
| 329 | Pharaoh & Associates, Inc. | Houston, TX 77252 | Oil & Gas Operator | Aug 2002 |
| 330 | Pie Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 331 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 332 | Plantation Operating Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Feb 2026 |
| 333 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 334 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 335 | Preferred Pipeline Corp. | Victoria, TX 77902 | Oil & Gas Operator | Dec 2025 |
| 336 | Premier Minerals, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 337 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | Feb 2026 |
| 338 | Primera Energy, LLC | Longview, TX 75606 | Oil & Gas Operator | Mar 2016 |
| 339 | Primrose Resources, LLC | Cedar Park, TX 78630 | Oil & Gas Operator | Feb 2026 |
| 340 | Producers Engineering Company | Destin, FL 32541 | Oil & Gas Operator | Sep 1999 |
| 341 | Production Resources, Inc. | Castroville, TX 78009 | Oil & Gas Operator | Feb 2026 |
| 342 | Progas Operating, Inc | Red Rock, TX 78662 | Oil & Gas Operator | Feb 2026 |
| 343 | Progenies Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 344 | Property Producing Co. | Columbus, TX 78934 | Gas Operator | Feb 2026 |
| 345 | Pyramid Energy Inc | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2012 |
| 346 | Qri Industries, Inc. | Katy, TX 77449 | Oil Operator | Feb 2026 |
| 347 | Quail Creek Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 348 | R & B Energy, LLC | Shelby, MT 59474 | Oil Operator | Jul 2025 |
| 349 | R & M Energy | Gonzales, TX 78629 | Oil & Gas Operator | Mar 2006 |
| 350 | R & S Oil Production Co. | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 351 | R&R Resources Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 352 | Radius Operating, LLC | Round Rock, TX 78664 | Oil & Gas Operator | Feb 2026 |
| 353 | Rampage Exploration, Inc. | Austin, TX 78737 | Oil & Gas Operator | Feb 2026 |
| 354 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 355 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Feb 2026 |
| 356 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 357 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Feb 2026 |
| 358 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 359 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 360 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Feb 2026 |
| 361 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 362 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 363 | Rocc Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Apr 2024 |
| 364 | Rocc Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Feb 2026 |
| 365 | Rollert Co., Inc., The | Luling, TX 78648 | Oil & Gas Operator | Nov 2000 |
| 366 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2026 |
| 367 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 368 | Ross Gas And Oil, LTD. Co. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Feb 2026 |
| 369 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 370 | Ruth Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Feb 2010 |
| 371 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 372 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 373 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Feb 2026 |
| 374 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 375 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 376 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 377 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 378 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 379 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 380 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 381 | Santana Energy Services, LLC | Baton Rouge, LA 70809 | Oil & Gas Operator | Feb 2026 |
| 382 | Sassco Petroleum, Inc. | Austin, TX 78763 | Oil & Gas Operator | Feb 2000 |
| 383 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Feb 2026 |
| 384 | Scully Energy Corporation | Salado, TX 76571 | Oil & Gas Operator | Mar 2012 |
| 385 | Seguro Well Service, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Feb 2026 |
| 386 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Feb 2026 |
| 387 | Sellers' Lease Service | Flatonia, TX 78941 | Oil & Gas Operator | Jul 1994 |
| 388 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Feb 2026 |
| 389 | Shale Hunter, LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 390 | Sharon Hunter Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2012 |
| 391 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2026 |
| 392 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Feb 2026 |
| 393 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 394 | Silverbow Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 395 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 396 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 397 | SN Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 398 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 399 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 400 | Southwest Land & Minerals, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2003 |