| String | Created | Updated |
|---|---|---|
| UA | 1992-12-01 | 2024-03-28 |
| UG | 1995-03-08 | 2012-10-26 |
| UK | 1985-07-24 | 2023-03-07 |
| UNIVERSITY | 2014-04-03 | 2023-09-12 |
| UNO | 2013-11-13 | 2024-03-20 |
| UOL | 2014-08-07 | 2023-11-14 |
| US | 1985-02-15 | 2024-04-16 |
| UY | 1990-09-10 | 2022-12-08 |
| UZ | 1995-04-29 | 2024-02-14 |
| UBANK | 2016-08-04 | 2023-08-11 |
| UBS | 2015-06-11 | 2023-08-11 |
| UCONNECT | 2016-07-07 | 2019-11-20 |
| UNICOM | 2016-01-22 | 2024-03-04 |
| UPS | 2016-04-14 | 2023-08-11 |