| 301 | OLSEN ET AL | Andrews County, TX | Oil & Gas Property | Apr 2025 |
| 302 | OLSON | Ward County, TX | Oil & Gas Property | Apr 2025 |
| 303 | OLSON | Crockett County, TX | Oil & Gas Property | Apr 2025 |
| 304 | OLSON | Bee County, TX | Oil & Gas Property | Nov 2016 |
| 305 | OLSON | Jones County, TX | Oil Property | Jan 2025 |
| 306 | OLSON ESSE-KENNEDY SA | Karnes County, TX | Oil & Gas Property | Apr 2025 |
| 307 | OLSON JO | Matagorda County, TX | Oil & Gas Property | Mar 2021 |
| 308 | OLSON STATE 57-T2-6 1H | Reeves County, TX | Oil & Gas Property | Apr 2025 |
| 309 | OLSON, R.H | Bastrop County, TX | Oil & Gas Property | Apr 2025 |
| 310 | OLSON-BAKER UNIT | Live Oak County, TX | Oil & Gas Property | Apr 2025 |
| 311 | OLSON-BKR-GNZLS U | Live Oak County, TX | Oil & Gas Property | Apr 2025 |
| 312 | OLSON-ESSE UNIT | Karnes County, TX | Oil & Gas Property | Apr 2025 |
| 313 | OLSON-GAP | Andrews County, TX | Oil & Gas Property | Apr 2025 |
| 314 | OLSSON | Moore County, TX | Gas Property | Apr 2025 |
| 315 | OLTMANN | Madison County, TX | Oil & Gas Property | Mar 2025 |
| 316 | OLUFSEN | Howard County, TX | Oil & Gas Property | Jul 2023 |
| 317 | OLYMPIA 57-56 | Fisher County, TX | Oil & Gas Property | Apr 2025 |
| 318 | OLYMPIC | Gonzales County, TX | Oil & Gas Property | Apr 2025 |
| 319 | OLYMPIC 54-2-7 | Loving County, TX | Oil & Gas Property | Apr 2025 |
| 320 | OLYMPUS | Lipscomb County, TX | Oil & Gas Property | Apr 2025 |
| 321 | OLYPHANT 57-T1-43X42 1H | Reeves County, TX | Oil & Gas Property | Apr 2025 |
| 322 | OMA MCMICHAEL GAS UNIT | Freestone County, TX | Oil & Gas Property | Apr 2025 |
| 323 | OMAHA | Irion County, TX | Oil & Gas Property | Apr 2025 |
| 324 | OMAHA 11 | Reeves County, TX | Oil & Gas Property | Mar 2025 |
| 325 | OMAHA 15 | Hemphill County, TX | Oil & Gas Property | Apr 2025 |
| 326 | OMAHA 175-176 | Ward County, TX | Oil & Gas Property | Apr 2025 |
| 327 | OMALLEY 1 | Washington County, TX | Oil & Gas Property | Apr 2025 |
| 328 | OMAN | Jones County, TX | Oil Property | Jan 2022 |
| 329 | OMAN KAROLYN | Shackelford County, TX | Oil & Gas Property | Dec 2019 |
| 330 | OMEGA UNIT | Gonzales County, TX | Oil & Gas Property | Apr 2025 |
| 331 | OMNI-FRAZIER | Denton County, TX | Oil & Gas Property | Apr 2025 |
| 332 | OMOHUNDRO | Wichita County, TX | Oil & Gas Property | Feb 2025 |
| 333 | ONA 44-3 | Glasscock County, TX | Oil & Gas Property | Apr 2025 |
| 334 | ONA BLACK 49 | Wheeler County, TX | Oil & Gas Property | Apr 2025 |
| 335 | ONAH | Robertson County, TX | Oil & Gas Property | Apr 2025 |
| 336 | ONAT | Jack County, TX | Oil & Gas Property | Apr 2025 |
| 337 | ONDRASEK MELVIN | Burleson County, TX | Oil & Gas Property | Jul 1993 |
| 338 | ONDRASEK OL UNIT | Burleson County, TX | Oil & Gas Property | Mar 2025 |
| 339 | ONE EYED JOHN 522 | Yoakum County, TX | Oil & Gas Property | Apr 2025 |
| 340 | ONEAL | Hutchinson County, TX | Oil & Gas Property | Jan 2025 |
| 341 | ONEAL | Milam County, TX | Oil & Gas Property | Oct 2007 |
| 342 | ONEAL | Gray County, TX | Oil & Gas Property | Oct 2020 |
| 343 | ONEAL | Cooke County, TX | Oil & Gas Property | Apr 2025 |
| 344 | ONEAL | Carson County, TX | Oil & Gas Property | Apr 2025 |
| 345 | ONEAL | Midland County, TX | Oil & Gas Property | Jan 2024 |
| 346 | ONEAL B. J. -NORTH | Upton County, TX | Oil & Gas Property | Jan 2017 |
| 347 | ONEAL B. J. ETAL | Upton County, TX | Oil & Gas Property | Apr 2025 |
| 348 | ONEAL B.G. ETAL | Stephens County, TX | Oil & Gas Property | Apr 2025 |
| 349 | ONEAL GAS UNIT | Bee County, TX | Oil & Gas Property | Apr 2025 |
| 350 | ONEAL SAN ANDRES UNIT | Upton County, TX | Oil & Gas Property | Jan 2017 |
| 351 | ONEAL, W. L | Smith County, TX | Oil & Gas Property | Apr 2025 |
| 352 | ONEAL,BILL JOHN NE/4 SEC 5 UN | Upton County, TX | Oil & Gas Property | Apr 2025 |
| 353 | ONEAL-ANNIE 15 | Midland County, TX | Oil & Gas Property | Apr 2025 |
| 354 | ONEALL | Clay County, TX | Oil & Gas Property | Apr 2025 |
| 355 | ONEIL | Bee County, TX | Oil & Gas Property | Feb 2025 |
| 356 | ONEIL | Collingsworth County, TX | Oil & Gas Property | Apr 2025 |
| 357 | ONEIL | Pecos County, TX | Oil & Gas Property | Dec 2018 |
| 358 | ONEIL | Cochran County, TX | Oil & Gas Property | Mar 2014 |
| 359 | ONEIL 4 | Martin County, TX | Oil & Gas Property | Apr 2025 |
| 360 | ONEY | Reeves County, TX | Oil & Gas Property | Apr 2025 |
| 361 | ONEY ALTON J. GAS UNIT 1H | Harrison County, TX | Oil & Gas Property | Apr 2025 |
| 362 | ONEY HENRY | Harrison County, TX | Oil & Gas Property | Apr 2025 |
| 363 | ONYX | Crockett County, TX | Oil & Gas Property | Mar 2025 |
| 364 | ONYX | Gonzales County, TX | Oil & Gas Property | Apr 2025 |
| 365 | OPAL | Gonzales County, TX | Oil & Gas Property | Apr 2025 |
| 366 | OPAL HV | Panola County, TX | Gas Property | Apr 2025 |
| 367 | OPEN RANGE 28-29 | Martin County, TX | Oil & Gas Property | Apr 2025 |
| 368 | OPEN UNIT | Howard County, TX | Oil & Gas Property | Apr 2025 |
| 369 | OPIE | Ector County, TX | Oil & Gas Property | Apr 2025 |
| 370 | OPIE TAYLOR | Martin County, TX | Oil & Gas Property | Apr 2025 |
| 371 | OPIELA | Karnes County, TX | Oil & Gas Property | Apr 2025 |
| 372 | OPIELA A | Karnes County, TX | Oil & Gas Property | Apr 2025 |
| 373 | OPIELA UNIT | Karnes County, TX | Oil & Gas Property | Apr 2025 |
| 374 | OPPENHEIMER | Frio County, TX | Oil & Gas Property | Mar 2025 |
| 375 | OPPENHEIMER 188 | Reeves County, TX | Oil & Gas Property | Mar 2025 |
| 376 | OPPENHEIMER JESSIE D | Frio County, TX | Oil & Gas Property | Apr 2022 |
| 377 | OPTIMUS PRIME | Henderson County, TX | Oil & Gas Property | Dec 2024 |
| 378 | OPUS | Hill County, TX | Oil & Gas Property | Apr 2025 |
| 379 | OQUINN C. F | Rusk County, TX | Oil & Gas Property | Mar 2025 |
| 380 | ORAN 4 | Palo Pinto County, TX | Oil & Gas Property | Apr 2025 |
| 381 | ORAN-PATTON | Palo Pinto County, TX | Oil & Gas Property | Sep 2012 |
| 382 | ORAND | Freestone County, TX | Oil & Gas Property | Apr 2025 |
| 383 | ORAND GAS UNIT NO. 1 | Freestone County, TX | Oil & Gas Property | Apr 2025 |
| 384 | ORANGE CRUSH UNIT 9 | Reeves County, TX | Oil & Gas Property | Apr 2025 |
| 385 | ORANGE UNIT | Atascosa County, TX | Oil & Gas Property | Apr 2025 |
| 386 | ORANSKY M.B. ET AL | Freestone County, TX | Oil & Gas Property | Aug 2024 |
| 387 | ORBISON 28 | Reeves County, TX | Oil & Gas Property | Apr 2025 |
| 388 | ORBIT 51-7-21-16 | Reeves County, TX | Oil & Gas Property | Apr 2025 |
| 389 | ORCA EAGLEFORD UNIT | Brazos County, TX | Oil & Gas Property | Mar 2025 |
| 390 | ORCA UNIT | Brazos County, TX | Oil & Gas Property | Mar 2025 |
| 391 | ORCA UNIT NO | Brazos County, TX | Oil & Gas Property | Mar 2025 |
| 392 | ORCHARD 40 | Glasscock County, TX | Oil & Gas Property | Apr 2025 |
| 393 | ORCHARD L. B | Archer County, TX | Oil & Gas Property | Jan 2025 |
| 394 | ORD NAN D | Young County, TX | Oil & Gas Property | Apr 2025 |
| 395 | OREDIGGER | Howard County, TX | Oil & Gas Property | Apr 2025 |
| 396 | OREILLY WA | Ector County, TX | Oil & Gas Property | Apr 2025 |
| 397 | OREL HERSHISER 32-41 | Midland County, TX | Oil & Gas Property | Apr 2025 |
| 398 | OREL HERSHISER 41-32 | Midland County, TX | Oil & Gas Property | Apr 2025 |
| 399 | ORELIA RANCH | Frio County, TX | Oil & Gas Property | Apr 2025 |
| 400 | ORELLANA | Irion County, TX | Oil & Gas Property | Apr 2025 |