| The FatDUX Group ApS | Capital Region of Denmark |
| The Many A/S | |
| The Unicorn | |
| Thiim A/S | Capital Region of Denmark |
| Thygaard Webdesign | North Jutland Region |
| Tia Technology | Capital Region of Denmark |
| tic elkas A/S | |
| TICRA | Capital Region of Denmark |
| Tictac Learn | Capital Region of Denmark |
| TietgenSkolen | |
| Tiger Media A/S | North Jutland Region |
| Tiimo A/S | |
| Time2web | Capital Region of Denmark |
| Timegrip | North Jutland Region |
| TimeLog A/S | Capital Region of Denmark |
| TimeXtender | Central Denmark Region |
| Tobi ApS | |
| Toitware ApS | |
| Tommerup Elektronik A/S | Region of Southern Denmark |
| Tonsser | Capital Region of Denmark |
| Too Good To Go ApS | |
| 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 |
| Toyota Danmark A/S | |
| TradeBench ApS | |
| Tradeworks ApS | |
| Tradium | |
| 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 |
| Twentyfour | |
| TwentyThree | Capital Region of Denmark |
| Twistellar ApS | |
| U/NORD | |
| UbiqiSense | |
| Ubivox Danmark ApS | Capital Region of Denmark |
| UC SYD | |
| UCL Erhvervsakademi og Professionshøjskole | |
| UCN | |
| Ucommerce ApS | |