| Media Group 34 AB | Bålsta | 0 tkr |
| Medialis AB | Uppsala | 0 tkr |
| Medicine Art Örlefors AB | Uppsala | 0 tkr |
| Medicla AB | Uppsala | 0 tkr |
| Medicus Filius AB | Uppsala | 0 tkr |
| Medicus i Sunnersta AB | Uppsala | 0 tkr |
| Medili Logistics Service AB | Örsundsbro | 0 tkr |
| Medi Metal Aktiebolag | Uppsala | 0 tkr |
| Medinnova consulting AB | Uppsala | 0 tkr |
| MediYou AB | Storvreta | 0 tkr |
| MedMark AB | Uppsala | 0 tkr |
| 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 |
| Megasol Technologies 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 |
| 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 |
| Metanoia omsorg 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 |