| XTREAMOR 1641902 · TMA948094 | an individual | 7 Machines | Registered | 2016 |
| XTREAMPURE 1571622 · TMA874354 | PECOFacet (US), Inc. | 11 Lighting | Registered | 2014 |
| XTREAMSEARCH 1634704 · TMA917869 | THE REYNOLDS AND REYNOLDS COMPANY | 9 Electronics42 Science | Registered | 2015 |
| XTREAMPOWER 1634709 · TMA917845 | THE REYNOLDS AND REYNOLDS COMPANY | 9 Electronics42 Science | Registered | 2015 |
| XTREAMSALES 1634705 · TMA918374 | THE REYNOLDS AND REYNOLDS COMPANY | 9 Electronics42 Science | Registered | 2015 |
| XTREAMSERVICE 1634706 · TMA917871 | THE REYNOLDS AND REYNOLDS COMPANY | 9 Electronics42 Science | Registered | 2015 |
| Xtremarz 2236010 · TMA1256824 | ALIF IMPEX LLC | 10 Medical | Registered | 2024 |
| XTREMIO 1732148 · TMA940941 | Dell Inc. | 9 Electronics | Registered | 2016 |
| XTREAMBDC 1638202 · TMA917848 | THE REYNOLDS AND REYNOLDS COMPANY | 9 Electronics42 Science | Registered | 2015 |
| XTREAMMBM 1634703 · TMA917868 | THE REYNOLDS AND REYNOLDS COMPANY | 9 Electronics42 Science | Registered | 2015 |
| XTREAMNEW 1634701 · TMA917867 | THE REYNOLDS AND REYNOLDS COMPANY | 9 Electronics42 Science | Registered | 2015 |
| XTREMERS 1130510 · TMA587663 | Trident Seafoods Corporation | 29 Meat | Registered | 2003 |
| XTREMEHB 2361107 | Data Panel Acquisition Corporation | 9 Electronics35 Advertising42 Science | Pending | 2024 |
| XTREMEDB 2327764 | Data Panel Acquisition Corporation | 9 Electronics35 Advertising42 Science | Pending | 2024 |
| XTREAMPHASE 1573720 · TMA983420 | Parker Intangibles LLC | 7 Machines11 Lighting | Registered | 2017 |
| XTREMTEC 2264719 · TMA1284885 · design | J2 International Group Limited | 9 Electronics | Registered | 2025 |
| XTREMEAXIS 2226141 · TMA1250230 · design | Xtremeaxis Inc. | 37 Construction42 Science | Registered | 2024 |
| XTRANSFER 2196852 · TMA1251029 | Shanghai Duohui Network Technology Co. Ltd. | 9 Electronics35 Advertising36 Finance+2 | Registered | 2024 |
| XTREME 2154758 · TMA1192166 · design | TATLAB Corporation | 2 Paints | Registered | 2023 |
| XTREMAQUA 2120956 · TMA1207433 | DART INDUSTRIES INC. | 21 Housewares | Registered | 2023 |
| XTRAIM 2111425 · TMA1229271 | an individual | 9 Electronics13 Firearms | Registered | 2024 |
| XSTREAM 2058493 · TMA1154163 | an individual | 7 Machines | Registered | 2022 |
| XTREME 2053415 · TMA1224926 | Xtreme Manufacturing, LLC | 7 Machines12 Vehicles | Registered | 2024 |
| XTREMEGRIP!! 2015993 · TMA1153963 | KINCO, LLC | 21 Housewares | Registered | 2022 |
| Xtrainerz 2005598 · TMA1131077 | SHOKZ (SINGAPORE) PTE. LTD. | 9 Electronics | Registered | 2022 |