| Name | City | Country | |
|---|---|---|---|
|  | Compugraphics Jena GmbH | Jena | Germany | 
|  | Core Materials Inc. | Uruma City | Japan | 
|  | CorTec GmbH | Freiburg | Germany | 
|  | CSEM Centre Suisse d'Electronique et de Microtechnique SA | Neuchâtel | Switzerland | 
|  | Cubic Sensor and Instrument Co. Ltd. | Wuhan | China | 
|  | DECHEMA e.V. | Frankfurt | Germany | 
|  | Delta Optical Thin Film A/S | Hørsholm | Denmark | 
|  | detect - We detect it. | Erfurt, Germany | Germany | 
|  | Digital in NRW - Mittelstand 4.0-Kompetenzzentrum Dortmund | Dortmund | Germany | 
|  | duotec GmbH | Halver | Germany | 
|  | eagleyard Photonics GmbH | Berlin | Germany | 
|  | Ebnet Medical GmbH | Schwerin | Germany | 
|  | Ehrfeld Mikrotechnik BTS GmbH | Wendelsheim | Germany | 
|  | ELMOS Semiconductor SE | Leverkusen | Germany | 
|  | ELSCHUKOM GmbH | Veilsdorf | Germany | 
| ENEA | Portici (Napoli) | Italy | |
|  | EOSWISS Engineering Sàrl | Geneve | Switzerland | 
|  | EPIC – European Photonics Industry Consortium | France | |
|  | Epiphany Photonic Design House | Enschede | Netherlands | 
|  | EPnP Medical GmbH | Neuhausen | Germany |