| Svensk Profilutformning AB | Sollentuna | — |
| Sverige Spol & Sug AB | Sollentuna | — |
| Swedish Basketball Academy AB | Sollentuna | — |
| Swedish wood export AB | Sollentuna | — |
| Swiss Vintage Watches Sweden AB | Sollentuna | — |
| TACOS & AREPAS QUE CHIMVA kommanditbolag | Sollentuna | — |
| Talani Utbildning AB | Sollentuna | — |
| Talosy AB | Sollentuna | — |
| Tandhygienist Maria Åberg AB | Sollentuna | — |
| Tandoori King Handelsbolag | Sollentuna | — |
| Tasele AB | Sollentuna | — |
| Taza Sweden AB | Sollentuna | — |
| TCOM AB | Sollentuna | — |
| Teamatik AB | Sollentuna | — |
| Teddy Pet AB | Sollentuna | — |
| Tervika AB | Sollentuna | — |
| Tetri Systems AB | Göteborg | — |
| TGC Sweden AB | Sollentuna | — |
| Thavelin Holding AB | Bergby | — |
| The Great Escape AB | Sollentuna | — |
| The Industry TI Handelsbolag | Sollentuna | — |
| Theraspect AB | Sollentuna | — |
| Thermatek Nordic AB | Sollentuna | — |
| Thermovent sälj i sollentuna Kommanditbolag | Sollentuna | — |
| THME Group AB | Sollentuna | — |
| TIMIOS HANDELSBOLAG | Sollentuna | — |
| TK Consulting Sweden AB | Sollentuna | — |
| Tollart Advokater AB | Sollentuna | — |
| Tollcross AB | Sollentuna | — |
| Tommy Ingvar AB | Sollentuna | — |
| Toppmurkleintressenter AB | Sollentuna | — |
| Torparängens Glass & kiosk AB | Sollentuna | — |
| Torqueify AB | Kista | — |
| Trektera AB | Sollentuna | — |
| Tre Vänner AB | Sollentuna | — |
| Tridactyla AB | Sollentuna | — |
| TriVera Consulting AB | Sollentuna | — |
| Troberg Consulting AB | Sollentuna | — |
| T-taxi AB | Sollentuna | — |
| TT-Kemkonsult AB | Höllviken | — |
| TUMMI AB | Sollentuna | — |
| Turebergs Biltjänst AB | Sollentuna | — |
| Tvillingarna Eklunds Handelsbolag | Sollentuna | — |
| Two Putt Birdie Handelsbolag | Sollentuna | — |
| Ulrika Lundahl Pharmacovigilance Consulting AB | Sollentuna | — |
| UNDERHÅLLSTEKNIK GÖRAN PETERSSON HANDELSBOLAG | Sollentuna | — |
| Unfair Advantage Consulting AB | Sollentuna | — |
| Unity Law Firm Handelsbolag | Sollentuna | — |
| Uppfeldt Konsult AB | Sollentuna | — |
| Utingo Handelsbolag | Sollentuna | — |