| Mälarvågen AB | Västerås | 0 tkr |
| Malding AB | Västerås | 0 tkr |
| Malid Konsult AB | Västerås | 0 tkr |
| Malin Rosqvist Holding AB | Västerås | 0 tkr |
| Malin Victoria AB | Västerås | 0 tkr |
| Mallavik Group AB | Västerås | 0 tkr |
| Malmkvist M Holding AB | Kvicksund | 0 tkr |
| Malö Invest AB | Västerås | 0 tkr |
| Malte Engman Holding AB | Västerås | 0 tkr |
| MAM Homes Holding AB | Västerås | 0 tkr |
| MaMy AB | Västerås | 0 tkr |
| Management By Beer MBB AB | Västerås | 0 tkr |
| Manholm Marin AB | Virsbo | 0 tkr |
| Mantellus Group AB | Västerås | 0 tkr |
| MAQ Management i Västerås AB | Västerås | 0 tkr |
| Maratea Health AB | Västerås | 0 tkr |
| Marbro AB | Västerås | 0 tkr |
| Marcus Öhrbom AB | Östervåla | 0 tkr |
| Marex Consult AB | Västerås | 0 tkr |
| Margareta Löfgren Förvaltning AB | Västerås | 0 tkr |
| Margareta Stendal Holding AB | Västerås | 0 tkr |
| Margaux & Co AB | Västerås | 0 tkr |
| Maria Körkkö AB | Västerås | 0 tkr |
| Marine Certification Scandinavia AB | Västerås | 0 tkr |
| MARK 1989 AB | Västerås | 0 tkr |
| Markedo AB | Stockholm | 0 tkr |
| Mark Holmgren Aktiebolag | Västerås | 0 tkr |
| Markin Holding AB | Västerås | 0 tkr |
| Markstedt Invest AB | Västerås | 0 tkr |
| Marmolux AB | Västerås | 0 tkr |
| Martin Berg Holding Group AB | Västerås | 0 tkr |
| Martin Linder Västerås AB | Västerås | 0 tkr |
| Martin Lundström Finans AB | Västerås | 0 tkr |
| Martin Wentz Invest AB | Farsta | 0 tkr |
| Maruth Children Clothes AB | Västerås | 0 tkr |
| Mäster Diaz Holding AB | Västerås | 0 tkr |
| Matbutiken Haga AB | Västerås | 0 tkr |
| Matbutiken i Danvikstull AB | Stockholm | 0 tkr |
| Mati Västerås AB | Västerås | 0 tkr |
| Matsåsen Holding AB | Västerås | 0 tkr |
| MATS Consult AB | Västerås | 0 tkr |
| Mattsson Brand & Risk AB | Västerås | 0 tkr |
| Matz med Z AB | Västerås | 0 tkr |
| Maud Englund Holding AB | Uppsala | 0 tkr |
| Mavely AB | Västerås | 0 tkr |
| MAV KON AB | Västerås | 0 tkr |
| Maximal Säkerhet Västerås AB | Västerås | 0 tkr |
| Maxloyal AB | Göteborg | 0 tkr |
| MAxner AB | Västerås | 0 tkr |
| M. Bennström Holding AB | Västerås | 0 tkr |