| Joker Sarina S.R.L. | Satu Mare |
| JSHeroes | Cluj |
| Junior Soft | Bucharest |
| JUNO Software S.R.L. | Bucharest |
| Justpixel | Bucharest |
| K3sol S.R.L. | |
| KA Damar Import Export S.R.L. | Bucharest |
| Kadeno | |
| Kaizen Evo | |
| Kaolin Technologies | |
| Karma | Bistrița-Năsăud |
| KennoMedia | Bucharest |
| Kepler Systèmes d'information | Bucharest |
| Ketek | |
| Key Soft S.R.L. | |
| KFactory | |
| Kinderpedia | |
| Kinetic Software | Bucharest |
| King Systems S.R.L. | Maramureș |
| Kodis | Bucharest |
| Koncept Advertising S.R.L. | |
| Kondiment | Bucharest |
| Konica Minolta Business Solutions Romania S.R.L. | Bucharest |
| KPIs Studio | |
| Kronect | Bucharest |
| Kronsoft Development S.R.L. | |
| Krypton Labs | |
| Kubitech S.R.L. | |
| Kvm Dot Ro | Bucharest |
| L2 | |
| LaDent | Cluj |
| Lamark Media | |
| Lambert Group Productions | Bucharest |
| Lamit Company | Bucharest |
| Land of Web | |
| Landingexam | |
| Lasting Software | Timiș |
| LearnZone | |
| Legrand România | |
| Lemon Studio | |
| Levand S.R.L. | Satu Mare |
| Level-Up | |
| Licenseware | |
| Life is Hard S.A. | |
| Liga Webdesign | |
| Ligeia | Bucharest |
| Light Pixel | Bucharest |
| LiMiT | |
| LiMiT S.R.L. | |
| Limitless Agency | |