| Abbreviation | Definition |
|---|---|
| UMJ | Ursa Major Minerals Incorporated |
| UNC | United Corporations Limited |
| UNG | Union Gas Limited |
| UNS | Uni-Select Inc. |
| UNS | Uni-Select Incorporated |
| URB | Urbana Corporation |
| URE | Ur-Energy Inc. |
| URE | Ur-Energy Incorporated |
| URZ | Uranerz Energy Corporation |
| UST | Utility Split Trust |
| UTC-C | Utility Corporation Class C |
| UTE | Canadian Utilities & Telecom Income Fund |
| UUU | Uranium One Inc. |
| UUU | Uranium One Incorporated |
| UXE | United States Gold Canadian Acquisition Corporation |
| UXE | US Gold Canadian Acquisition Corporartion |
| VAA | Vaaldiam Mining Inc. |
| VAA | Vaaldiam Mining Incorporated |
| VCM | Vecima Networks Inc. |
| VCM | Vecima Networks Incorporated |