| 301 | UL TAWNY UNIT 8-12 | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 302 | UL TILDEN 16-31-32 | Ward County, TX | Oil & Gas Property | Dec 2023 |
| 303 | UL URAD 1609-21 | Winkler County, TX | Oil & Gas Property | Jan 2024 |
| 304 | UL WAYLON | Upton County, TX | Oil & Gas Property | Jan 2024 |
| 305 | UL WILLIE | Upton County, TX | Oil & Gas Property | Jan 2024 |
| 306 | UL WILLOW 383633-16 | Ward County, TX | Oil & Gas Property | Jan 2024 |
| 307 | UL YANKEE BOY 18-17 | Ward County, TX | Oil & Gas Property | Jan 2024 |
| 308 | UL YELLOWTAIL | Winkler County, TX | Oil & Gas Property | Jan 2024 |
| 309 | UL13 KEENE | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 310 | ULA F. NELSON WELLER | Marshall County, WV | Oil & Gas Property | Dec 2021 |
| 311 | ULC-0 | Tuscaloosa County, AL | Gas Property | Nov 2023 |
| 312 | ULC-TAURUS | Tuscaloosa County, AL | Gas Property | Nov 2023 |
| 313 | ULC-TAURUS-9 | Tuscaloosa County, AL | Gas Property | Nov 2023 |
| 314 | ULDRICH | Seminole County, OK | Oil & Gas Property | Nov 2020 |
| 315 | ULIBARRI GAS COM | San Juan County, NM | Oil & Gas Property | Feb 2024 |
| 316 | ULLIE EAGLE | Creek County, OK | Oil Property | Jul 2023 |
| 317 | ULLMAN | Monroe County, OH | Oil & Gas Property | Dec 2023 |
| 318 | ULLMAN | Gonzales County, TX | Oil & Gas Property | Jan 2024 |
| 319 | ULLMAN | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 320 | ULLMAN | Washington County, OH | Oil & Gas Property | Dec 2023 |
| 321 | ULLMAN H | Washington County, OH | Oil & Gas Property | Dec 2014 |
| 322 | ULLMAN JACOB H | Noble County, OH | Oil & Gas Property | Dec 2023 |
| 323 | ULLMANN | Noble County, OH | Oil Property | Dec 2023 |
| 324 | ULLOM | Washington County, OH | Oil & Gas Property | Dec 2022 |
| 325 | ULMER | Upton County, TX | Oil & Gas Property | Nov 2023 |
| 326 | ULMER | Sedgwick County, KS | Oil Property | Aug 2021 |
| 327 | ULMER 24-21H | Dunn County, ND | Oil & Gas Property | Feb 2024 |
| 328 | ULRICH | Monroe County, OH | Oil & Gas Property | Dec 2022 |
| 329 | ULRICH | Greenwood County, KS | Oil Property | Sep 2021 |
| 330 | ULRICH | Russell County, KS | Oil Property | Aug 1990 |
| 331 | ULRICH | Weld County, CO | Oil & Gas Property | Apr 2017 |
| 332 | ULRICH | Greenwood County, KS | Oil Property | Feb 1995 |
| 333 | ULRICH | Dewitt County, TX | Oil & Gas Property | Jan 2024 |
| 334 | ULRICH | Monroe County, OH | Oil & Gas Property | Dec 2023 |
| 335 | ULRICH | Weld County, CO | Oil & Gas Property | May 2023 |
| 336 | ULRICH | Weld County, CO | Oil & Gas Property | Jan 2024 |
| 337 | ULRICH A - WILLIAMS A SA 1 1H | Dewitt County, TX | Oil & Gas Property | Jan 2024 |
| 338 | ULRICH PC I 17 | Weld County, CO | Oil & Gas Property | Feb 2018 |
| 339 | ULS 4 | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 340 | ULS 4 | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 341 | ULS 5 | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 342 | ULS 5-9 UNIT | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 343 | ULS 6-3 | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 344 | ULS A | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 345 | ULS B | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 346 | ULS CDU | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 347 | ULS CDU 4-1 | Andrews County, TX | Oil & Gas Property | Jan 2024 |
| 348 | ULSH | Edwards County, KS | Oil & Gas Property | Dec 2023 |
| 349 | ULSH 'A' | Grant County, KS | Gas Property | Dec 2023 |
| 350 | ULT 1 | Uintah County, UT | Oil & Gas Property | Jan 2024 |
| 351 | ULT 3 | Uintah County, UT | Oil & Gas Property | Jan 2024 |
| 352 | ULT 4 | Uintah County, UT | Oil & Gas Property | Jan 2024 |
| 353 | ULT 5 | Uintah County, UT | Oil & Gas Property | Jan 2024 |
| 354 | ULT 6 | Uintah County, UT | Oil & Gas Property | Jan 2024 |
| 355 | ULT 7 | Uintah County, UT | Oil & Gas Property | Jan 2024 |
| 356 | ULT 8 | Uintah County, UT | Oil & Gas Property | Jan 2024 |
| 357 | ULT 9 | Uintah County, UT | Oil & Gas Property | Jan 2024 |
| 358 | ULTIMATE WARRIOR | Lycoming County, PA | Gas Property | Jan 2024 |
| 359 | ULTRA U A STATE | Chaves County, NM | Oil & Gas Property | Jan 2024 |
| 360 | ULURU 35 FEDERAL | Eddy County, NM | Oil & Gas Property | Jan 2024 |
| 361 | ULVESTAD | Midland County, TX | Oil & Gas Property | Jan 2024 |
| 362 | ULVESTAD-BIRKHEAD E20 | Midland County, TX | Oil & Gas Property | Jan 2024 |
| 363 | UMA UNIT | Hill County, TX | Oil & Gas Property | Jan 2024 |
| 364 | UMANSKY | Alfalfa County, OK | Oil & Gas Property | Dec 2023 |
| 365 | UMBACH | Grady County, OK | Oil & Gas Property | Dec 2023 |
| 366 | UMBACH | Grady County, OK | Oil & Gas Property | Dec 2023 |
| 367 | UMBARGER | Neosho County, KS | Oil & Gas Property | Dec 2023 |
| 368 | UMBARGER | Neosho County, KS | Gas Property | Dec 2023 |
| 369 | UMBARGER | Wilson County, KS | Oil & Gas Property | Dec 2023 |
| 370 | UMBARGER | Wilson County, KS | Oil & Gas Property | May 2023 |
| 371 | UMBEHR | Riley County, KS | Oil Property | Dec 2023 |
| 372 | UMBER 11-28-16 | Woods County, OK | Oil & Gas Property | Jan 2024 |
| 373 | UMBERSON | Montague County, TX | Oil & Gas Property | Jan 2024 |
| 374 | UMBERT PETRARCA | Indiana County, PA | Gas Property | Dec 2023 |
| 375 | UMBRELLA POINT UNIT | Chambers County, TX | Oil & Gas Property | Jul 2013 |
| 376 | UMCC 'A' | Meade County, KS | Oil Property | Nov 2022 |
| 377 | UMIVERSITY BLOCK 46 | Crockett County, TX | Oil & Gas Property | Jan 2024 |
| 378 | UMLANG-LEHMANN UNIT | Lee County, TX | Oil & Gas Property | Jan 2024 |
| 379 | UMMEL | Ness County, KS | Oil Property | Aug 2015 |
| 380 | UMMEL | Ness County, KS | Oil Property | Dec 2023 |
| 381 | UMMEL | Ness County, KS | Oil Property | Nov 2023 |
| 382 | UMMEL | Ness County, KS | Oil Property | Nov 2023 |
| 383 | UMMEL | Ness County, KS | Oil Property | Nov 2023 |
| 384 | UMPHRESS,C. F. ET AL | Howard County, TX | Oil & Gas Property | Mar 2019 |
| 385 | UMSTEAD | Stafford County, KS | Oil Property | Dec 2023 |
| 386 | UMSTED | Ouachita County, AR | Oil & Gas Property | Dec 1999 |
| 387 | UMSTED | Union County, AR | Oil Property | Feb 2024 |
| 388 | UNA FIFE | Creek County, OK | Oil Property | Jan 2024 |
| 389 | UNA HYRAL | Johnson County, TX | Gas Property | Jan 2024 |
| 390 | UNBRIDLED 36 | Culberson County, TX | Oil & Gas Property | Jan 2024 |
| 391 | UNBRIDLED 5-8-10-7 | Canadian County, OK | Oil & Gas Property | Dec 2023 |
| 392 | UNCLE BILL | Kingfisher County, OK | Oil & Gas Property | Dec 2023 |
| 393 | UNCLE BILL 1 | Lipscomb County, TX | Oil & Gas Property | Jan 2024 |
| 394 | UNCLE CECIL | Terrell County, TX | Oil & Gas Property | Jan 2024 |
| 395 | UNCLE CHES 21 16 FEDERAL COM | Lea County, NM | Oil & Gas Property | Jan 2024 |
| 396 | UNCLE CHES 21 16 FEDERAL COM 125H | Lea County, NM | Oil & Gas Property | Jan 2024 |
| 397 | UNCLE FEDERAL | Lea County, NM | Oil & Gas Property | Jan 2024 |
| 398 | UNCLE JERRY DAVIS | Liberty County, TX | Oil Property | Dec 2023 |
| 399 | UNCLE SAM | Lea County, NM | Oil & Gas Property | Jan 2024 |
| 400 | UNCLE SAM 13 | Lea County, NM | Oil & Gas Property | May 2022 |