| MapaMap | Masovian |
| Mapi Media | |
| Mar-Pol Computers | Łódź |
| Marcin Pawelec | Masovian |
| Marcos Bis | Silesian |
| MARCZYK | Lesser Poland |
| Marken | Pomeranian |
| Markeplanet | |
| Market One Capital | Masovian |
| Marketing w Internecie | Masovian |
| Marki Mikrotech S.A. | |
| Marksoft | Masovian |
| MARS Computer Systems Spółka Jawna | Pomeranian |
| Marsat | Pomeranian |
| Marsoft S.A. | Lublin |
| Marta Maro | Łódź |
| Martis Consulting | |
| Marton Media Sp. z o.o. | Kuyavian-Pomeranian |
| Mass Internet | Świętokrzyskie |
| Masta P.H.U. | Greater Poland |
| Masterdev | Masovian |
| MasterMatch | |
| Maszyna.pl | Lesser Poland |
| Mate Academy | |
| Matrix Technology Sp. z o.o. | |
| MAW Telecom International S.A. | Masovian |
| Maximum Interactive | Świętokrzyskie |
| Maxkomputer | Kuyavian-Pomeranian |
| Maxoft | Kuyavian-Pomeranian |
| Małopolska Uczelnia Państwowa im. rtm.W. Pileckiego w Oświęcimiu | |
| Małopolska Wyższa Szkoła Ekonomiczna w Tarnowie | |
| mBank Hipoteczny S.A. | |
| mBank S.A. | Łódź |
| MBS Systems S.C. | Warmian-Masurian |
| MCI Capital TFI S.A. | Masovian |
| MCX Sp. z o.o. | Masovian |
| MDBootstrap.com | |
| MDDP Business Consulting | |
| Meco System Sp. z o.o. | Lesser Poland |
| MedApp S.A. | |
| Media System | Lublin |
| Mediadat Software Sp. z o.o. | West Pomeranian |
| Mediarecovery | |
| Mediart Sp. z o.o. | Kuyavian-Pomeranian |
| Medical Simulation Technologies Sp. z o.o. | |
| Medical Simulation Technologies Sp. z o.o. | |
| MEDICALgorithmics S.A. | Masovian |
| Medicodent | |
| Meditronik Sp. z o.o. | Masovian |
| medVC.eu Sp. z o.o. | |