| Javra Software | |
| JB Besturingstechniek | Overijssel |
| JCroonen.nl | Utrecht |
| JDS - bedrijfsautomatisering B.V. | Limburg |
| JDS Design & Marketing | |
| Jedlix | South Holland |
| Jellema Automatisering B.V. | Overijssel |
| Jelmoo Studio | |
| JEM-id | South Holland |
| JéPé IT | Zeeland |
| Jeroen Adema | Utrecht |
| Jesse Vlaselvd | Drenthe |
| Jester | Utrecht |
| Jet-Stream Services B.V. | Groningen |
| JETA Molecular B.V. | |
| Jetzt Spielen.ws | Overijssel |
| JG Solutions | |
| JG Webmarketing | |
| JIS Nederland B.V. | Overijssel |
| JISR | |
| JK Automatisering | North Brabant |
| JK Webdesign | North Holland |
| JLGsoft | Limburg |
| Jmango360 B.V. | |
| 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 | |
| Jorr-IT | |
| journy.io B.V. | |
| JouwWeb | North Brabant |
| Joy Group | Flevoland |
| JP Database Solutions | South Holland |
| JPF Computing B.V. | South Holland |
| JSWorld Conference | |
| JTAG Technologies B.V. | North Brabant |
| JTP Brandinghouse | |
| Julius Clinical | |
| Just Connect | Friesland |
| Just Internet Group | |
| JustGo | |
| JVO Java | South Holland |
| K-Design Dataherstel | North Brabant |
| K-Solutions | |
| Kahuna Managing Security | Utrecht |