| Mokall AB | Västerås | 0 tkr |
| Möklinta Livs och Pizzeria AB | Möklinta | 0 tkr |
| Mollex Holding AB | Norberg | 0 tkr |
| Mölndals Elektriska Aktiebolag | Västerås | 0 tkr |
| M. Olsson Holding AB | Kvicksund | 0 tkr |
| Monere Consulting AB | Västerås | 0 tkr |
| Money Tree Invest AB | Västerås | 0 tkr |
| Moneywolf Invest AB | Västerås | 0 tkr |
| Monika Vajda AB | Västerås | 0 tkr |
| Monrads Consulting AB | Västerås | 0 tkr |
| Monsferri AB | Torshälla | 0 tkr |
| Moral Holding AB | Västerås | 0 tkr |
| Morberg Invest AB | Strömsholm | 0 tkr |
| Morecrona Holding AB | Västerås | 0 tkr |
| Moregrit AB | Stockholm | 0 tkr |
| More Musli Scandinavia AB | Västerås | 0 tkr |
| Morgongåva Bygg & Entreprenad AB | Sala | 0 tkr |
| Morviken Förvaltning AB | Västerås | 0 tkr |
| Motion & Rotation Sweden AB | Västerås | 0 tkr |
| MotiveringsCentrum AB | Västerås | 0 tkr |
| Motorsport Technology Sweden AB | Sala | 0 tkr |
| Movefix Sverige AB | Köping | 0 tkr |
| Moveman Aktiebolag | Hallstahammar | 0 tkr |
| MoveRight Sverige AB | Kolbäck | 0 tkr |
| MPA Industrial Coating AB | Västerås | 0 tkr |
| MP Holding Västerås AB | Västerås | 0 tkr |
| MRM Holding AB | Falköping | 0 tkr |
| Mr Pac Group AB | Västerås | 0 tkr |
| MRTK Holding AB | Västerås | 0 tkr |
| MRW Invest AB | Arboga | 0 tkr |
| MSH Holding AB | Västerås | 0 tkr |
| M Sörensen Kapitalförvaltning AB | Västerås | 0 tkr |
| M. Spännare Holding AB | Hallstahammar | 0 tkr |
| MSTech Sweden AB | Västerås | 0 tkr |
| M Stenlund AB | Västerås | 0 tkr |
| MT Bygg & Design AB | Bandhagen | 0 tkr |
| M&T Fastigheter i Köping AB | Köping | 0 tkr |
| MTH HOLDING AB | Västerås | 0 tkr |
| MT Lie AB | Västerås | 0 tkr |
| MTN Care AB | Hallstahammar | 0 tkr |
| MTUH Holding AB | Valskog | 0 tkr |
| MT Verksamhetsutveckling AB | Köping | 0 tkr |
| Mulberry Green TEA i Västerås AB | Västerås | 0 tkr |
| MultiServ (Sweden) AB | Norberg | 0 tkr |
| Munkgruvans Bryggeri AB | Norberg | 0 tkr |
| Musicens AB | Arboga | 0 tkr |
| Music on a Plate AB | Köping | 0 tkr |
| Mustafa Group AB | Västerås | 0 tkr |
| MUVIS AB | Köping | 0 tkr |
| MVEA Holding AB | Sala | 0 tkr |