| Magnoliahöjden AB | Danderyd | 0 tkr |
| Magnor Co AB | Stocksund | 0 tkr |
| Magnor Invest AB | Stocksund | 0 tkr |
| Magnus Jernberg Invest AB | Enebyberg | 0 tkr |
| Magnus Leijonborg Holding AB | Enebyberg | 0 tkr |
| Magnus Maximus Holding AB | Rö | 0 tkr |
| Magnus Modalen AB | Strömsnäsbruk | 0 tkr |
| Mains and CrossCourt Tennis and Health AB | Djursholm | 0 tkr |
| MAJAK Holding AB | Djursholm | 0 tkr |
| MAJAK Invest & Consulting AB | Djursholm | 0 tkr |
| Majstigen Base Camp AB | Stocksund | 0 tkr |
| Majstigen Consulting AB | Stocksund | 0 tkr |
| Make up my mind AB | Stocksund | 0 tkr |
| Maldives Undersea Resorts AB | Stocksund | 0 tkr |
| Malgus AB | Stocksund | 0 tkr |
| Mallekart AB | Enebyberg | 0 tkr |
| Malmqvist & Partners AB | Djursholm | 0 tkr |
| Malone Consulting AB | Danderyd | 0 tkr |
| Malplaquet 2 AB | Djursholm | 0 tkr |
| Malplaquet AB | Djursholm | 0 tkr |
| Målspar Invest AB | Djursholm | 0 tkr |
| Mandalou AB | Danderyd | 0 tkr |
| Mandeba AB | Stocksund | 0 tkr |
| Mandola group AB | Djursholm | 0 tkr |
| Maple Syryp Design AB | Stockholm | 0 tkr |
| Marcus Andersson Invest AB | Danderyd | 0 tkr |
| Mårdaklev Fastighets AB | Mårdaklev | 0 tkr |
| Mardoc AB | Stockholm | 0 tkr |
| Margareta Neld Holding AB | Djursholm | 0 tkr |
| Margaretha Hjartberg AB | Djursholm | 0 tkr |
| Marga Ståhl PR AB | Djursholm | 0 tkr |
| Maria Engelbrekts AB | Djursholm | 0 tkr |
| Maria-Pia Bengtsson AB | Enebyberg | 0 tkr |
| Marisö AB | Stockholm | 0 tkr |
| Maritime Legal Consulting AB | Djursholm | 0 tkr |
| Markbolaget Väsjön 2 AB | Danderyd | 0 tkr |
| Market Access Consulting Sweden AB | Danderyd | 0 tkr |
| Marketplaces Simplified AB | Djursholm | 0 tkr |
| Marknadsbolaget Björn Ahlberg Aktiebolag | Djursholm | 0 tkr |
| Marknadskompaniet Sleipner Aktiebolag | Täby | 0 tkr |
| Märs Agency AB | Åkersberga | 0 tkr |
| Mårten Pehrson AB | Danderyd | 0 tkr |
| Mårten Skogö Holding AB | Djursholm | 0 tkr |
| Märtha AB | Stocksund | 0 tkr |
| Martin Ingelgård Förvaltnings AB | Djursholm | 0 tkr |
| Martin Lundin Pensionsförvaltning AB | Glumslöv | 0 tkr |
| Marwind AB | Danderyd | 0 tkr |
| Maskin & Montage Mech Intressenter AB | Djursholm | 0 tkr |
| Master Mind Psykologi AB | Stockholm | 0 tkr |
| Material Challenge Lab AB | Västra Frölunda | 0 tkr |