| Mersin Holding AB | Eskilstuna | 0 tkr |
| Mesta Fastighetsutveckling AB | Eskilstuna | 0 tkr |
| Mestahof AB | Eskilstuna | 0 tkr |
| Metrify Holding AB | Eskilstuna | 0 tkr |
| MFC Trading AB | Eskilstuna | 0 tkr |
| MFHS Hällby-Ökna 1:47 AB | Eskilstuna | 0 tkr |
| M Fogenstad Fiolen 8 AB | Eskilstuna | 0 tkr |
| M Fogenstad Garage Hot Rod & Classics AB | Eskilstuna | 0 tkr |
| M Fogenstad Invest AB | Eskilstuna | 0 tkr |
| MF Växlaren Holding AB | Eskilstuna | 0 tkr |
| MF Växlaren Invest AB | Eskilstuna | 0 tkr |
| MG Holding AB | Stora Sundby | 0 tkr |
| M. Helldorff Holding AB | Eskilstuna | 0 tkr |
| MHRR i Eskilstuna AB | Eskilstuna | 0 tkr |
| MH Unlimited-SQL AB | Växjö | 0 tkr |
| Michello avanti AB | Södertälje | 0 tkr |
| Mikael Örn Invest AB | Eskilstuna | 0 tkr |
| Mikromekanik i Sörmland Förvaltning AB | Eskilstuna | 0 tkr |
| Milan Machinery Sweden AB | Eskilstuna | 0 tkr |
| Min byggare Eddie Sahlén Holding AB | Torshälla | 0 tkr |
| Mithras Nordic AB | Eskilstuna | 0 tkr |
| Mixi Holding AB | Eskilstuna | 0 tkr |
| Mjagki Znak Holdings AB | Solna | 0 tkr |
| MJ Group AB | Eskilstuna | 0 tkr |
| M.Källan AB | Eskilstuna | 0 tkr |
| MK Mälarbadens Camping AB | Eskilstuna | 0 tkr |
| MK Recycling AB | Eskilstuna | 0 tkr |
| M.L.A Westmanland AB | Möklinta | 0 tkr |
| M.Lindgren Holding AB | Kvicksund | 0 tkr |
| MN Eskilstuna AB | Eskilstuna | 0 tkr |
| MNS Holding AB | Eskilstuna | 0 tkr |
| MNS sjöevent AB | Eskilstuna | 0 tkr |
| MN TOP FLOOR AB | Eskilstuna | 0 tkr |
| Möbelcenter i Tumbo AB | Kvicksund | 0 tkr |
| Moberigo Invest AB | Eskilstuna | 0 tkr |
| Mona Wadefur AB | Eskilstuna | 0 tkr |
| Moribus AB | Eskilstuna | 0 tkr |
| Moroptik AB | Mariefred | 0 tkr |
| Morslund AB | Eskilstuna | 0 tkr |
| Mourne Project AB | Eskilstuna | 0 tkr |
| Movima Holding AB | Eskilstuna | 0 tkr |
| MPF Maskin & Allservice AB | Stora Sundby | 0 tkr |
| MPM Invest AB | Eskilstuna | 0 tkr |
| Mr. PIV AB | Eskilstuna | 0 tkr |
| MSA Förvaltning AB | Ärla | 0 tkr |
| MSG Group Eskilstuna AB | Eskilstuna | 0 tkr |
| MSL Invest AB | Eskilstuna | 0 tkr |
| MTM Holding AB | Eskilstuna | 0 tkr |
| MUMB ESPORTS AB | Eskilstuna | 0 tkr |
| M.Y läkarkonsult AB | Eskilstuna | 0 tkr |