| Danthas ICT | Friesland |
| DapTechnology B.V. | Overijssel |
| DAS Automatisering | South Holland |
| Data Group Europe B.V. | Zeeland |
| Data Recovery Nederland B.V. | North Brabant |
| Data-Assist | |
| DATA-collectief | |
| Data.overheid.nl | North Holland |
| Data4 | North Brabant |
| Dataa Access Corporation | Overijssel |
| Databalance Services B.V. | North Brabant |
| Databel | North Brabant |
| DataByte | North Brabant |
| DataCare Nederland B.V. | North Brabant |
| Datacommit | |
| Datacon Integration Solutions B.V. | North Brabant |
| DatAction | Flevoland |
| Datadate B.V. | Gelderland |
| DataDidact | Utrecht |
| DataExpert B.V. | Utrecht |
| Datafloq | South Holland |
| DataJobs.nl | |
| Datametrics B.V. | |
| DataMondial | South Holland |
| Datanamic Solutions | South Holland |
| Datapool | North Brabant |
| DataProfit | North Holland |
| Dataprovider B.V. | Groningen |
| DataQuint B.V. | |
| Dataroots B.V. | |
| Datatrics | Overijssel |
| DataVisual | |
| Dataweb | South Holland |
| Datawerken IT B.V. | Utrecht |
| Dateq B.V. | Flevoland |
| Datlinq | South Holland |
| Davinci | |
| DAx | North Brabant |
| DAX Archiving Solutions | North Holland |
| Daxis-ICT | Overijssel |
| Day Two B.V. | North Brabant |
| DB+ | South Holland |
| db8 | Gelderland |
| DBA Consulting | |
| DDI | North Holland |
| DDS | South Holland |
| De Autocad Tekenaar | Drenthe |
| De Designserver | North Holland |
| De Haagse Hogeschool | South Holland |
| De Harderwijker Computerclub | Gelderland |