| Fighter | Record | Last Bout |
|---|---|---|
| Carlos Ulberg | 15-1-0 | 2026-04-11 |
| Gilbert Urbina | 8-5-0 | 2026-10-17 |
| Ilimbek Akylbek Uulu | 10-3-0 | 2026-09-26 |
| Kamaru Usman | 21-5-0 | 2026-07-18 |
| Mohammed Usman | 12-4-0 | 2025-06-21 |
| Tagir Ulanbekov | 17-3-0 | 2025-11-22 |
| Umar Nurmagomedov | 20-2-0 | 2026-08-29 |
| Uran Satybaldiev | 9-1-0 | 2025-08-23 |
| Uros Medic | 14-3-0 | 2026-08-01 |
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