| JK Webdesign | North Holland |
| JLGsoft | Limburg |
| JMD Web | |
| Jobsrepublic | North Holland |
| Join | |
| JoinData | |
| Jongens van Techniek B.V. | |
| Joomla web hosting | Flevoland |
| Joomla Webdesign Utrecht | Utrecht |
| JoomlaCommunity.eu | North Holland |
| Joppe Computers | |
| journy.io B.V. | |
| JouwWeb | North Brabant |
| Joy Group | Flevoland |
| JP Database Solutions | South Holland |
| JPF Computing B.V. | South Holland |
| JTAG Technologies B.V. | North Brabant |
| Just Connect | Friesland |
| Just Internet Group | |
| JVO Java | South Holland |
| K-Design Dataherstel | North Brabant |
| K-Solutions | |
| Kahuna Managing Security | Utrecht |
| Kaizo | North Holland |
| KameraOne B.V. | North Holland |
| KamphuisGroep | Utrecht |
| Kannegieter | Utrecht |
| Kanteff Speech Processing | South Holland |
| Karmac | Flevoland |
| Katanox B.V. | |
| KBC Import / Export | Gelderland |
| KCR Computers | Drenthe |
| KCS B.V. | South Holland |
| KDB Security | |
| KeeminK Design B.V. | North Holland |
| Keen Venture Partners | North Holland |
| KeenCorp | South Holland |
| KellyW Design | |
| Kembit | Limburg |
| Kempen Automatisering | North Holland |
| Kenney | |
| Kentaa B.V. | Gelderland |
| Keylane B.V. | Utrecht |
| KGOM.nl | Overijssel |
| Khondrion B.V. | |
| KICK-ICT | South Holland |
| KickStart Europe | |
| Kien | |
| Kieskeurig | North Holland |
| KIMO | |