| Link Media S.R.L. | Bucharest |
| Linnify | |
| LiveHosting | Timiș |
| Livius | Iași |
| Livolo România | |
| Logicode S.A. | |
| Logik Software Solutions | Bucharest |
| Logiq Design | |
| Logis Developments | Bucharest |
| Loop Virtual Reality Solutions | |
| Lord Prod Consult S.R.L. | Olt |
| Lotus Telecom | Bucharest |
| LuaDNS | Bucharest |
| Luconsult Team | |
| Luconsult Team S.R.L. | Bucharest |
| Luxsoft | Bucharest |
| Lynx Solutions | |
| Machteamsoft | |
| Madd Electronics Group Romania | Cluj |
| Magazingsm.ro | Bucharest |
| Magenta Advertising | Bucharest |
| MagicaIT | Bucharest |
| Magister Software S.R.L. | Bucharest |
| Magnet Media | |
| Marconi Media | Cluj |
| Marketing Direct | |
| Marteo Consulting S.r.l. | Prahova |
| Master Computers | Bucharest |
| MB Distribution | Bucharest |
| MB Solutions S.R.L. | Sibiu |
| MBF Network România | |
| Mbm software | Bucharest |
| MC Regional | Hunedoara |
| MCRO | |
| Mechatronics Innovation Center | |
| Meda Consulting | |
| Media Consum Imc S.R.L. | Bucharest |
| Media Division LLC | Sibiu |
| Media Sat | Bucharest |
| Media Serv S.R.L. | Sibiu |
| Mediacode Serv | |
| Mediafun Impex S.R.L. | Bucharest |
| Mediatic Digital Services | |
| Megahost | Bucharest |
| memIQ | Timiș |
| Mensis Agency | |
| Mentor Marketing & Distribution S.R.L. | Bucharest |
| Mesh Software S.R.L. | |
| MetroNet Telecom S.R.L. | Bucharest |
| MicroERP | Bihor |