| 301 | OBSIDIAN 147-93-16B-21H-TF | Dunn County, ND | Oil & Gas Property | Apr 2025 |
| 302 | OBYRNE | Upshur County, TX | Oil & Gas Property | Apr 2017 |
| 303 | OBYRNE | Hitchcock County, NE | Oil Property | Dec 2024 |
| 304 | OBYRNE HEIRS | Upshur County, TX | Oil & Gas Property | Mar 2025 |
| 305 | OCA MCKENZIE ETAL | Claiborne Parish, LA | Oil & Gas Property | Dec 2024 |
| 306 | OCAMPO 4-9C4 | Duchesne County, UT | Oil & Gas Property | Mar 2025 |
| 307 | OCAMPO, EDUARDO MARTIN 1 | Lincoln County, WV | Oil & Gas Property | Dec 2021 |
| 308 | OCATILLA STATE 2-40 | Reeves County, TX | Oil & Gas Property | Mar 2025 |
| 309 | OCCIDENTAL | Big Horn County, WY | Oil & Gas Property | Dec 2013 |
| 310 | OCCIDENTAL | San Joaquin County, CA | Gas Property | Jul 1995 |
| 311 | OCEANA | Stephens County, OK | Oil & Gas Property | Feb 2025 |
| 312 | OCEANIC | Kern County, CA | Oil & Gas Property | Apr 2025 |
| 313 | OCEANSIDE | Fresno County, CA | Oil Property | Jan 1997 |
| 314 | OCEL | Carroll County, OH | Oil & Gas Property | Mar 2025 |
| 315 | OCELOT | Atascosa County, TX | Oil & Gas Property | Mar 2025 |
| 316 | OCELOT 1-15H | Williams County, ND | Oil & Gas Property | Apr 2025 |
| 317 | OCELOT 34 FEDERAL COM | Lea County, NM | Oil & Gas Property | Mar 2025 |
| 318 | OCELOT ALLOCATION | Atascosa County, TX | Oil & Gas Property | Mar 2025 |
| 319 | OCHENTA 4-31B4 | Duchesne County, UT | Oil & Gas Property | Mar 2025 |
| 320 | OCHILTREE | Gray County, TX | Oil & Gas Property | Aug 2020 |
| 321 | OCHILTREE COUNTY | Ochiltree County, TX | Oil & Gas Property | Apr 2024 |
| 322 | OCHILTREE FARMS 112 | Ochiltree County, TX | Oil & Gas Property | Feb 2025 |
| 323 | OCHO | Webb County, TX | Gas Property | Mar 2025 |
| 324 | OCHO 1 | Webb County, TX | Gas Property | Mar 2025 |
| 325 | OCHO JUAN UNIT | Fisher County, TX | Oil & Gas Property | Jul 2024 |
| 326 | OCHO LD 17-3 | Adams County, CO | Oil & Gas Property | Mar 2025 |
| 327 | OCHO MDL | Webb County, TX | Gas Property | Mar 2025 |
| 328 | OCHOA | Hidalgo County, TX | Oil & Gas Property | Mar 2025 |
| 329 | OCHOA 8703 FEDERAL COM | Eddy County, NM | Oil & Gas Property | Apr 2025 |
| 330 | OCHS | Russell County, KS | Oil Property | Nov 2024 |
| 331 | OCHS | Stafford County, KS | Oil Property | Dec 2020 |
| 332 | OCHS | Rush County, KS | Oil & Gas Property | Dec 2024 |
| 333 | OCHS | Barton County, KS | Oil Property | Oct 2024 |
| 334 | OCHS | Ness County, KS | Oil Property | May 2022 |
| 335 | OCHS | Clarion County, PA | Gas Property | Dec 2024 |
| 336 | OCHS | Clearfield County, PA | Gas Property | Dec 2024 |
| 337 | OCHS INVESTMENT LTD PARTNERSHIP | Clarion County, PA | Gas Property | Dec 2024 |
| 338 | OCHS/SBI | Armstrong County, PA | Gas Property | Dec 2024 |
| 339 | OCHSNER | Cheyenne County, KS | Oil Property | Mar 2002 |
| 340 | OCHSNER | Cheyenne County, KS | Gas Property | Feb 2025 |
| 341 | OCHSNER | Weld County, CO | Oil & Gas Property | Jan 2023 |
| 342 | OCHSNER | Cheyenne County, KS | Gas Property | Feb 2025 |
| 343 | OCKER D.A. & R.L | Wilson County, TX | Oil & Gas Property | Jan 2023 |
| 344 | OCKERT | Grand Traverse County, MI | Oil & Gas Property | Apr 2025 |
| 345 | OCKULY | Grant County, KS | Gas Property | Feb 2025 |
| 346 | OCOMA | Weld County, CO | Oil & Gas Property | Mar 2025 |
| 347 | OCOMA | Weld County, CO | Oil & Gas Property | Dec 2016 |
| 348 | OCOMA B | Weld County, CO | Oil & Gas Property | Oct 2016 |
| 349 | OCOMA UPRR LEASE B | Weld County, CO | Oil & Gas Property | Oct 2016 |
| 350 | OCONN | Stafford County, KS | Oil & Gas Property | Nov 2008 |
| 351 | OCONN | Franklin County, KS | Oil Property | May 1999 |
| 352 | OCONN | Refugio County, TX | Oil & Gas Property | Mar 2025 |
| 353 | OCONN | Refugio County, TX | Oil & Gas Property | Mar 2025 |
| 354 | OCONN | Eastland County, TX | Oil & Gas Property | Mar 2025 |
| 355 | OCONN | Trego County, KS | Oil Property | Feb 2025 |
| 356 | OCONN | Refugio County, TX | Oil & Gas Property | May 2019 |
| 357 | OCONN | Morton County, KS | Gas Property | Feb 2025 |
| 358 | OCONNEL | Blaine County, MT | Gas Property | Mar 2025 |
| 359 | OCONNELL A | Atascosa County, TX | Oil & Gas Property | Feb 2025 |
| 360 | OCONNER 1 | Campbell County, WY | Oil & Gas Property | Sep 2019 |
| 361 | OCONNER M. E | Refugio County, TX | Oil & Gas Property | Jan 2022 |
| 362 | OCONNOR | San Benito County, CA | Oil Property | Mar 2025 |
| 363 | OCONNOR | Goliad County, TX | Oil & Gas Property | Sep 2024 |
| 364 | OCONNOR | Refugio County, TX | Oil & Gas Property | Mar 2025 |
| 365 | OCONNOR | Goliad County, TX | Oil & Gas Property | Sep 2024 |
| 366 | OCONNOR | Refugio County, TX | Oil & Gas Property | Mar 2025 |
| 367 | OCONNOR | Refugio County, TX | Oil & Gas Property | Mar 2025 |
| 368 | OCONNOR DENNIS ET AL -N | Refugio County, TX | Oil & Gas Property | Mar 2025 |
| 369 | OCONNOR DENNIS ETAL | Refugio County, TX | Oil & Gas Property | Mar 2025 |
| 370 | OCONNOR THOMAS | Refugio County, TX | Gas Property | Aug 2008 |
| 371 | OCONNOR TR | Labette County, KS | Gas Property | Feb 2025 |
| 372 | OCONNOR, DENNIS | Refugio County, TX | Oil & Gas Property | Apr 2020 |
| 373 | OCONNOR, DENNIS ET AL | Refugio County, TX | Oil & Gas Property | Mar 2025 |
| 374 | OCONNOR-D | Refugio County, TX | Oil & Gas Property | Mar 2025 |
| 375 | OCOTILLO 149-92-35A-04H | Dunn County, ND | Oil & Gas Property | Apr 2025 |
| 376 | OCOTILLO 27 | Ward County, TX | Oil & Gas Property | Mar 2025 |
| 377 | OCOTILLO 6 31 STATE COM | Eddy County, NM | Oil & Gas Property | Mar 2025 |
| 378 | OCOTILLO ACI FED | Eddy County, NM | Oil & Gas Property | Mar 2020 |
| 379 | OCOTILLO HILLS | Eddy County, NM | Oil & Gas Property | Mar 2025 |
| 380 | OCOTILLO SUNRISE | Lea County, NM | Oil & Gas Property | Mar 2025 |
| 381 | OCRACOKE ISLAND | Ward County, TX | Oil & Gas Property | Apr 2020 |
| 382 | OCRC ETAL 12-21 | Otsego County, MI | Oil & Gas Property | Oct 2024 |
| 383 | OCTA NUPP | Indiana County, PA | Gas Property | Dec 2024 |
| 384 | OCTAVIA | Hughes County, OK | Oil & Gas Property | Feb 2025 |
| 385 | OCTODOG | Wise County, TX | Oil & Gas Property | Feb 2025 |
| 386 | OD FEDERAL | Eddy County, NM | Oil & Gas Property | Mar 2025 |
| 387 | ODANI | Midland County, TX | Oil & Gas Property | Mar 2025 |
| 388 | ODANIEL | Howard County, TX | Oil & Gas Property | Feb 2023 |
| 389 | ODANIEL | Pottawatomie County, OK | Oil & Gas Property | Dec 2024 |
| 390 | ODANIEL | Bossier Parish, LA | Oil & Gas Property | Nov 2024 |
| 391 | ODANIEL | Midland County, TX | Oil & Gas Property | Mar 2025 |
| 392 | ODANIEL | Gaines County, TX | Oil & Gas Property | Mar 2025 |
| 393 | ODANIEL | Howard County, TX | Oil & Gas Property | Mar 2025 |
| 394 | ODANIEL | Howard County, TX | Oil & Gas Property | Mar 2025 |
| 395 | ODANIEL RANCH | Howard County, TX | Oil & Gas Property | Feb 2025 |
| 396 | ODANIEL RANCH 28-37 | Howard County, TX | Oil & Gas Property | Feb 2025 |
| 397 | ODC /SAN ANDRES/ UNIT | Gaines County, TX | Oil & Gas Property | May 2023 |
| 398 | ODC 17 | Ochiltree County, TX | Oil & Gas Property | Feb 2025 |
| 399 | ODC 27 | Gaines County, TX | Oil & Gas Property | Jul 2022 |
| 400 | ODC 9 | Hansford County, TX | Oil & Gas Property | Mar 2025 |