| Cyber Marchands | Jura |
| Cyber Network S.A. | Geneva |
| Cyberbotics Ltd | Vaud |
| Cybériade | Vaud |
| Cyberlink AG | Zurich |
| Cybermedia Concepts | Geneva |
| Cybrient Technologies S.A. | |
| Cyon GmbH | Basel-Stadt |
| Cyrus.ch S.à.r.l. | Geneva |
| Cyverse AG | Zurich |
| Dabu Flow AG | Zurich |
| Dacadoo | Zurich |
| Dachcom | St. Gallen |
| Daedalean AG | Zurich |
| Damanet.ch | Bern |
| Damian Pharma AG | |
| Daniel Borkmann | |
| Darest Informatik S.A. | Geneva |
| DART Labs | |
| Dartecs GmbH | Aargau |
| Dartfish | Fribourg |
| Dasysto AG | Zurich |
| Data Concept | Vaud |
| Data Quest AG | Zurich |
| Data Unit AG | Lucerne |
| Data-Comm | Vaud |
| Data-Mail-2000 S.A. | Valais |
| Databaar | Zug |
| databaum GmbH | |
| DataCore GmbH | Zurich |
| Datamars S.A. | Ticino |
| DataSmart AG | Solothurn |
| DataStore AG | Aargau |
| Datatrans AG | Zurich |
| Datawire AG | Zug |
| Datenretter-Schweiz GmbH | Zurich |
| Datentechnik Spengler & Reutimann | Zurich |
| Datum | |
| Dätwyler Holding, Inc. | Uri |
| Daura Ltd | |
| DAV | Zug |
| DayOne | |
| DBI Services S.A. | Jura |
| DC Graphic & Art Studio | Ticino |
| DDS Netcom AG | Zurich |
| Debiopharm | |
| Decent | Geneva |
| Decentriq | |
| Deep Breath Intelligence AG | |
| DeepSquare Association | Zug |