| TimePlan Software A/S | North Jutland Region |
| TimePlan Software A/S | |
| TimeXtender | Central Denmark Region |
| Tobi ApS | |
| Toitware ApS | |
| Tommerup Elektronik A/S | Region of Southern Denmark |
| Tonsser | Capital Region of Denmark |
| TOPdesk Danmark A/S | Capital Region of Denmark |
| Topsil Semiconductor Materials A/S | Capital Region of Denmark |
| Toro IT | Central Denmark Region |
| Torp IT Service | Region Zealand |
| TradeBench ApS | |
| Tradeworks ApS | |
| Traede | |
| TransSoft A/S | |
| TriBits ApS | |
| Tricent Security Group A/S | |
| Tricon International | Region of Southern Denmark |
| Trifork | Central Denmark Region |
| Trustpilot, Inc. | |
| TS Computer ApS | |
| TTMS Nordic A/S | Capital Region of Denmark |
| Turis ApS | |
| Tweakker | Central Denmark Region |
| TwentyThree | Capital Region of Denmark |
| TwentyThree | |
| UbiqiSense | |
| Ubivox Danmark ApS | Capital Region of Denmark |
| UC SYD | |
| UCL Erhvervsakademi og Professionshøjskole | |
| UCN | |
| Ucommerce ApS | |
| Uddannelsescenter Holstebro | |
| Uizard | |
| Umbraco A/S | Region of Southern Denmark |
| Unconventional Ventures | |
| Undo Forsikringsagentur A/S | Capital Region of Denmark |
| Unica Host ApS | Region Zealand |
| Unifeeder A/S | |
| Uniify ApS | |
| Unik System Design A/S | Region of Southern Denmark |
| UNION therapeutics A/S | |
| Uniqkey A/S | |
| Unique Human Capital A/S | Capital Region of Denmark |
| Unisense A/S | |
| Unit IT | |
| UnitSpeed Host | Capital Region of Denmark |
| Universal Robots A/S | Region of Southern Denmark |
| UNIwise ApS | |
| Unsilo | Central Denmark Region |