| Medmeco aktiebolag | Knivsta | 0 tkr |
| MedSand AB | Vänge | 0 tkr |
| Medser AB | Uppsala | 0 tkr |
| Meducate AB | Täby | 0 tkr |
| Meeuw AB | Stenhamra | 0 tkr |
| Mega Bygg AB | Uppsala | 0 tkr |
| Megasol Technologies AB | Uppsala | 0 tkr |
| Megingjord AB | Stockholm | 0 tkr |
| Melexe AB | Uppsala | 0 tkr |
| Meliane Invest AB | Knivsta | 0 tkr |
| MeliLeo Consulting AB | Uppsala | 0 tkr |
| Melin Science AB | Uppsala | 0 tkr |
| Melins Service & Reparationer AB | Knivsta | 0 tkr |
| Mella & Björkman AB | Uppsala | 0 tkr |
| Mellansvenska Industriinstallationer Kärnkraftsteknik AB | Skutskär | 0 tkr |
| Mellansvenska Vård AB | Uppsala | 0 tkr |
| MELL Entreprenad AB | Knivsta | 0 tkr |
| Mellerstedt Medical Consulting AB | Falun | 0 tkr |
| MELOLI AB | Uppsala | 0 tkr |
| Melvin Holding AB | Uppsala | 0 tkr |
| Meqaro AB | Uppsala | 0 tkr |
| Merhaba Holding AB | Uppsala | 0 tkr |
| Merkantas AB | Uppsala | 0 tkr |
| Mer o mer data AB | Knivsta | 0 tkr |
| Merservice Kvarnbolund AB | Uppsala | 0 tkr |
| Merze Properties AB | Enköping | 0 tkr |
| Mesenkia Therapeutics AB | Uppsala | 0 tkr |
| MESSOB AB | Uppsala | 0 tkr |
| Messo VSN AB | Uppsala | 0 tkr |
| Metacon Technology AB | Uppsala | 0 tkr |
| MetaCru AB | Gävle | 0 tkr |
| Metallbörsen AB | Uppsala | 0 tkr |
| Metapart AB | Knivsta | 0 tkr |
| Methority AB | Uppsala | 0 tkr |
| Metlab Fastigheter Holding AB | Enköping | 0 tkr |
| Metod Förvaltning i Uppsala AB | Uppsala | 0 tkr |
| Mettlesome AB | Vattholma | 0 tkr |
| MFD Capital AB | Enköping | 0 tkr |
| Mfin AB | Uppsala | 0 tkr |
| MF Produktion Investment AB | Tierp | 0 tkr |
| MGG Holding AB | Uppsala | 0 tkr |
| M. Ghetti Ventures AB | Uppsala | 0 tkr |
| MG Hus AB | Uppsala | 0 tkr |
| MGNT Consulting AB | Ekolsund | 0 tkr |
| M. Gunnarsson Holding AB | Uppsala | 0 tkr |
| M Hammar Fastigheter AB | Uppsala | 0 tkr |
| M.Hedefalk Didaktik AB | Uppsala | 0 tkr |
| MH GARP Invest AB | Hudiksvall | 0 tkr |
| MH Läkartjänst AB | Uppsala | 0 tkr |
| MH Media AB | Gimo | 0 tkr |