| TODA Invest AB | Västerås | 0 tkr |
| Tohny Tjernkvist AB | Västerås | 0 tkr |
| Tolv Projekt Holding AB | Västerås | 0 tkr |
| Tomas Johansson Holding AB | Västerås | 0 tkr |
| Tommy Bennström AB | Falun | 0 tkr |
| Tomuch Västerås AB | Västerås | 0 tkr |
| Torbjörn Ericson Engineering AB | Skultuna | 0 tkr |
| Torbjörn Hedevärn Holding AB | Västerås | 0 tkr |
| Tornkransen Fastigheter AB | Västerås | 0 tkr |
| Totalbyggen i Västerås Holding AB | Västerås | 0 tkr |
| Toteel Transport AB | Angered | 0 tkr |
| TOTI Holding AB | Västerås | 0 tkr |
| TP Teknopartner AB | Västerås | 0 tkr |
| Trackteam Holding AB | Falun | 0 tkr |
| Tracon Group AB | Västerås | 0 tkr |
| Transporttjänst i Västerås AB | Ransta | 0 tkr |
| Trax Scandinavia AB | Västerås | 0 tkr |
| Tremella AB | Vällingby | 0 tkr |
| Tre Streck Group AB | Västerås | 0 tkr |
| Trissentum Invest AB | Västerås | 0 tkr |
| Trumvallen Invest Aktiebolag | Västerås | 0 tkr |
| TRY Dental AB | Västerås | 0 tkr |
| TS Montage AB | Västerås | 0 tkr |
| TTB i Västerås AB | Västerås | 0 tkr |
| TTSJ Invest AB | Skultuna | 0 tkr |
| Tunby Blästring & Målning Holding AB | Västerås | 0 tkr |
| Tunby Holding AB | Västerås | 0 tkr |
| Tunbytorp Bygg Västerås AB | Västerås | 0 tkr |
| Tunbytorp Finsnickeri AB | Västerås | 0 tkr |
| Tunbytorp Transport AB | Västerås | 0 tkr |
| Tu Ph Holding AB | Västerås | 0 tkr |
| Tuppa AB | Västerås | 0 tkr |
| Twindej Holding AB | Västerås | 0 tkr |
| Twistboxesholding AB | Västerås | 0 tkr |
| Twistboxes Pro AB | Västerås | 0 tkr |
| Tytalus holding AB | Kvicksund | 0 tkr |
| U-Go AB | Västerås | 0 tkr |
| UJR Bygg & Miljökonsult AB | Falun | 0 tkr |
| ULAN Invest AB | Västerås | 0 tkr |
| Ulf Sjökvist Åkeri Holding AB | Västerås | 0 tkr |
| Ulf Sjökvist Invest AB | Västerås | 0 tkr |
| Ullvi Holding AB | Västerås | 0 tkr |
| Ulrika Pettersson Nogelius Holding AB | Skultuna | 0 tkr |
| Umbrella AB | Västerås | 0 tkr |
| Unik Balans Holding AB | Västerås | 0 tkr |
| Unilat AB | Stockholm | 0 tkr |
| Unnebäck psykologbyrå AB | Västerås | 0 tkr |
| Untalented AB | Västerås | 0 tkr |
| Uppgård Redovisning AB | Krylbo | 0 tkr |
| Urban Hedman Holding AB | Västerås | 0 tkr |