| No. | Participant / Organisation Name | Country |
| 1 | Vrije Universiteit Brussel | Belgium |
| 2 | Center National de la Recherche Scientifique | France |
| 3 | Institute of Communication and Computer Systems | Greece |
| 4 | LioniX International | Netherlands |
| 5 | Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek | Netherlands |
| 6 | University of Ghent | Belgium |
| 7 | Politechnika Warszawska | Poland |
| 8 | AIMEN Technology Centre | Spain |
| 9 | ALPhANOV – the Optics and Laser Technology Center | France |
| 10 | Laboratoire d’Electronique et de Technologie de l’Information | France |
| 11 | Conzorzio Nazionale Interuniversitario per le Telecomunicazioni | Italy |
| 12 | Foundation for Research and Technology Hellas | Greece |
| 13 | Łukasiewicz Research Network – Institute of Electronic Materials Technology | Poland |
| 14 | Karlsruhe Institute of Technology | Germany |
| 15 | Leibniz-Institut fuer Photonische Technologie E.V. | Germany |
| 16 | LIGENTEC SA | Switzerland |
| 17 | Laser Zentrum Hannover | Germany |
| 18 | Research Institutes of Sweden | Sweden |
| 19 | SMART Photonics BV | Netherlands |
| 20 | Scuola Superiore Sant’Anna of Pisa | Italy |
| 21 | Universitat Politècnica de València | Spain |
| 22 | CARTIF | Spain |
| 23 | EL.En S.p.A | Italy |
| 24 | Leonardo | Italy |
| 25 | Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V. | Germany |
| 26 | Technische Universiteit Eindhoven | Netherlands |
| 27 | Swiss Center for Electronics and Microtechnology | Switzerland |
| 28 | Interuniversitair Micro-Electronica Centrum VZW | Belgium |
| 29 | Teknologian Tutkimuskeskus VTT oy | Finland |
| 30 | Tyndall National Institute, University College Cork | Ireland |
| 31 | Consiglio Nazionale delle Ricerche | Italy |
| 32 | École Polytechnique Fédérale de Lausanne | Switzerland |
| 33 | Joanneum Research Forschungsgesellschaft mbH | Austria |
| 34 | Universitat Politècnica de Catalunya | Spain |
| 35 | Fundacio Institut de Ciencies Fotoniques | Spain (Catalonia) |
| 36 | University of Southampton Optoelectronics Research Centre – Centre for Process Innovation | UK |
| LOCAL PHOTONICS HUBS | |
| 37 | Photonics France | France |
| 38 | PhotonDelta | Netherlands |
| 39 | Flanders Make | Belgium |
| 40 | Optec-Berlin-Brandenburg | Germany |
| 41 | OptoNet – Photoniknetzwerk Thüringen | Germany |
| 42 | Photonics Finland | Finland |
| 43 | Hellenic Photonics Cluster | Greece |
| 44 | Lazerinių ir inžinerinių technologijų klasteris | Lithuania |
| 45 | Polish Technological Platform on Photonics | Poland |
| 46 | Photonics Sweden | Sweden |
| 47 | Confindustria Toscana | Italy |
| BUSINESS SUPPORT PROVIDERS | |
| 48 | 24IP Law Group France SARL | France |
| 49 | AMIRES | Czechia |
| 50 | European Business Network (EBN) | Belgium |
| 51 | European Photonics Industry Consortium | Belgium |
| 52 | FundingBox | Poland |
| 53 | TechTour | Bulgaria |