The basis of Hexa-X was developed early on to allow for a selective and well-composed choice of participants who combine the necessary background and critical mass to lay the foundations of 6G systems, in a flagship action capable to put EU at the forefront of research and development in B5G/6G. For this reason, the Consortium includes top representatives of all stakeholders involved in this value chain, ranging from vendors, operators, IT industry, and high-tech companies. They together create a unique ecosystem capable to realize the Hexa-X main objectives and take on a global leadership role. Multinational industries, innovative SMEs, and distinguished research labs and universities, all EU based, ensure a broad level of internationally acknowledged technical expertise, and guarantee high-quality contributions and solution to the Hexa-X challenges. The Consortium is composed of 25 organizations from 9 countries: Finland, Sweden, Germany, France, Italy, Spain, Greece, Turkey, Hungary. The two network vendors (Nokia and Ericsson) lead the project, Nokia with overall lead and Ericsson being the technical manager. They take the substantial roles of strategic drivers of a flagship vision for 6G through this project. Other three large ICT industries (Siemens Aktiengesellschaft, Atos Spain S.A., Intel Deutschland GmbH) complement the industry group to bring in essential capabilities on AI, network orchestration, and special purpose solutions. Academic and research organizations participating in Hexa-X provide the necessary scientific excellence and research in B5G/6G topics that will maximize the technological impact of the project’s output. Finally, the involved SMEs provide necessary skills in orchestration, AI, channel modelling to ensure viability of the Hexa-X solutions. All Hexa-X participants have been at the centre of national and international strategic innovation initiatives, including 5G PPP Phase I/II/III projects, and have an impressive track record of successful, impactful research and innovation activities at national and European levels.