| Syddansk Innovation | Region of Southern Denmark |
| Syddansk Universitet | Region of Southern Denmark |
| Syddansk Universitet - Institut for Matematik og Datalogi | Region of Southern Denmark |
| SynergyXR ApS | |
| Synklino A/S | |
| syntheticAIdata ApS | |
| Syntio Ltd | |
| Systemate Aarhus | Central Denmark Region |
| Systematic | Central Denmark Region |
| SystemConnect | |
| Søgaard & Co. ApS | Central Denmark Region |
| T3CMS ApS | Capital Region of Denmark |
| Tame ApS | Capital Region of Denmark |
| Tamigo ApS | |
| Tangora | Capital Region of Denmark |
| Targit | North Jutland Region |
| TC Systems | Central Denmark Region |
| TDC Erhverv | Capital Region of Denmark |
| TDC NET A/S | |
| Team Direct ApS | Capital Region of Denmark |
| team.blue Denmark A/S | |
| Tech Data Denmark ApS | |
| Tech instrumentering | Central Denmark Region |
| Tech Nordic Advocates | |
| TechBBQ | |
| TechEdge Group | |
| TechPeople A/S | Capital Region of Denmark |
| Techsolutions A/S | |
| Teitur Trophics | |
| Teknologisk Institut | Capital Region of Denmark |
| Tele Call | Region of Southern Denmark |
| Telecenteret A/S | Capital Region of Denmark |
| Telenor A/S | |
| Templafy | Capital Region of Denmark |
| Teton.ai ApS | |
| Tetra Pharm Technologies | |
| Tetrabit ApS | |
| The FatDUX Group ApS | Capital Region of Denmark |
| The Many A/S | |
| 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 |
| Tiger Media A/S | North Jutland Region |
| Tiimo A/S | |
| Tiimo A/S | |
| Time2web | Capital Region of Denmark |
| TimeLog A/S | Capital Region of Denmark |