| Marsviksstrand AB | Nyköping | 0 tkr |
| MASEN & ERIKSSON HOLDING AB | Nyköping | 0 tkr |
| Maskindesign Ingemar Lundin Aktiebolag | Tystberga | 0 tkr |
| Mats Dahlberg Holding AB | Nyköping | 0 tkr |
| Mats Eriksson i Stigtomta AB | Stigtomta | 0 tkr |
| Mats Haglund Förvaltning AB | Stavsjö | 0 tkr |
| Matte A Invest AB | Nyköping | 0 tkr |
| Mattias Forsberg Holding AB | Nyköping | 0 tkr |
| Mauni invest AB | Stigtomta | 0 tkr |
| Maxat AB | Nyköping | 0 tkr |
| MB3 Konsult AB | Stockholm | 0 tkr |
| M. Brunelius Holding AB | Nyköping | 0 tkr |
| MCLS Holding AB | Nyköping | 0 tkr |
| MEDAM AB | Stockholm | 0 tkr |
| Medibyte AB | Enskede | 0 tkr |
| Mediwona AB | Falun | 0 tkr |
| Melfa Holding AB | Nyköping | 0 tkr |
| Mellisberg Holding AB | Nyköping | 0 tkr |
| Mercator Agriculture Aktiebolag | Stockholm | 0 tkr |
| Mettsons AB | Enstaberga | 0 tkr |
| Mexab Industri AB | Stockholm | 0 tkr |
| MF Utbildningsfastigheter AB | Eskilstuna | 0 tkr |
| MF Västerås Utb Fastighets AB | Eskilstuna | 0 tkr |
| MF Västerås Utb Holding AB | Eskilstuna | 0 tkr |
| Mica Z Helger AB | Nyköping | 0 tkr |
| Michael B Holding AB | Nyköping | 0 tkr |
| Michael Wulff Affärsrådgivning AB | Nyköping | 0 tkr |
| Middagstipsen Sverige AB | Orsa | 0 tkr |
| Mikael Frischenfeldt Förvaltnings AB | Nyköping | 0 tkr |
| Mikimax AB | Nävekvarn | 0 tkr |
| MiPsson Data AB | Oxelösund | 0 tkr |
| MK Nyköping Holding AB | Nyköping | 0 tkr |
| ML MBT AB | Nyköping | 0 tkr |
| Moa Nyköping AB | Mölndal | 0 tkr |
| Mörrbäck Fastigheter Entreprenad Aktiebolag | Nyköping | 0 tkr |
| M. Östling Aktiebolag | Vrena | 0 tkr |
| MT Holding Sweden AB | Nyköping | 0 tkr |
| MTSG Konsult AB | Nyköping | 0 tkr |
| MUJ Holding AB | Nyköping | 0 tkr |
| Muren Fastighet AB | Nyköping | 0 tkr |
| Mustor Holding AB | Nyköping | 0 tkr |
| MW Capital AB | Nyköping | 0 tkr |
| Mystery Games i Nyköping AB | Skärholmen | 0 tkr |
| Naessén Holding AB | Nyköping | 0 tkr |
| NAMAJ AB | Huskvarna | 0 tkr |
| Naprapat Linda Norlin AB | Nyköping | 0 tkr |
| N A Svensson Träkomponenter AB | Nyköping | 0 tkr |
| ND Enterprise AB | Nyköping | 0 tkr |
| NEAB AB | Nyköping | 0 tkr |
| Nera Sverige AB | Nyköping | 0 tkr |