| Teroc Independent Power AB | Köping | 0 tkr |
| TeSt Holding AB | Västerås | 0 tkr |
| Tetrix Engineering AB | Västerås | 0 tkr |
| TEWI Holding AB | Kungsör | 0 tkr |
| TF Fröholmen AB | Västerås | 0 tkr |
| TG Marina Holding AB | Västerås | 0 tkr |
| THB AB | Västerås | 0 tkr |
| The back & wife holding AB | Västerås | 0 tkr |
| The Bozz Sweden AB | Hallstahammar | 0 tkr |
| The Bucketlist Company AB | Västerås | 0 tkr |
| The Manual Scandinavia AB | Järfälla | 0 tkr |
| THEOKAR AB | Stockholm | 0 tkr |
| Therese Nyberg AB | Sala | 0 tkr |
| Therese Turpin AB | Västerås | 0 tkr |
| Therese Watkinson Invest AB | Västerås | 0 tkr |
| Third Circle AB | Hallstahammar | 0 tkr |
| THK Consulting AB | Västerås | 0 tkr |
| Tholin Invest AB | Västerås | 0 tkr |
| Thorsén Pörhö AB | Västerås | 0 tkr |
| Thothem Invest AB | Köping | 0 tkr |
| ThoWil Management AB | Västerås | 0 tkr |
| Thyni Företagsrådgivning AB | Falun | 0 tkr |
| TIB Holding AB | Västerås | 0 tkr |
| Tick Tack Service AB | Västerås | 0 tkr |
| TIDA Invest AB | Västerås | 0 tkr |
| Tidö-Lindö Konsult AB | Järfälla | 0 tkr |
| Tidö-Lindö Plåtslageri AB | Västerås | 0 tkr |
| TIFO i Västerås AB | Västerås | 0 tkr |
| TIFO i Västmanland AB | Västerås | 0 tkr |
| Tillsammans för Västra Mälardalen AB | Arboga | 0 tkr |
| Ti Me Development AB | Stockholm | 0 tkr |
| Tipp & Trailer i Fagersta Aktiebolag | Fagersta | 0 tkr |
| Tjern Invest AB | Kvicksund | 0 tkr |
| TJM Holding i Västerås AB | Västerås | 0 tkr |
| TJOLOLO AB | Västerås | 0 tkr |
| TK9 Consulting AB | Västerås | 0 tkr |
| TKEC Holding AB | Västerås | 0 tkr |
| T & L Hammar AB | Västerås | 0 tkr |
| T Lind Holding AB | Västerås | 0 tkr |
| TLL Mekankonsult Aktiebolag | Göteborg | 0 tkr |
| TLM Kraft AB | Västerås | 0 tkr |
| T Lövstedt AB | Västerås | 0 tkr |
| TM Bygg i Köping AB | Köping | 0 tkr |
| TMFE Holding AB | Skultuna | 0 tkr |
| TN Fastighetsförvaltning, Tommy Nyström AB | Västerås | 0 tkr |
| T Norells Trädgårdar i Västerås AB | Västerås | 0 tkr |
| TNPB Invest AB | Västerås | 0 tkr |
| Tobias Albert Aktiebolag | Västerås | 0 tkr |
| TODA Invest AB | Västerås | 0 tkr |
| ToFri Invest AB | Kvicksund | 0 tkr |