TREF Composition as from January 2026
| Chair | Ms Sarah Verth |
| Austria | Mr Christoph Wieland |
| Belgium | Professor Pierre Van Mechelen |
| Bulgaria | Ms Zornitsa Todorova |
| Czech Republic | Mr Ondřej Novák |
| Denmark | Mr Gustav Egeberg Nielsen |
| Estonia | Dr Kairi Otto |
| Finland | Mr Pietari Kauttu |
| France | Ms Nathalie Prentout (Vice-Chair) |
| Germany | Ms Sarah Kudling |
| Greece | Dr Christos Markou |
| Hungary | Dr Györgyi Juhász |
| Israel | Ms Leora Hadar |
| Italy | Dr Veronica Buccheri |
| Netherlands | Mr Elmar van Holten |
| Norway | Mr Ole Petter Nordahl |
| Poland | Dr Dariusz Drewniak |
| Portugal | Mr André Ortega Costa |
| Romania | Ms Madalina Borceanu |
| Serbia | Ms Mia Nikolić |
| Slovakia | Professor Stanislav Tokár |
| Slovenia | Dr Igor Mandić |
| Spain | Ms Carmen Gómez Sánchez |
| Sweden | Dr Olof Lundberg |
| Switzerland | Ms Melissa Lucarelli |
| United Kingdom | Ms Abigail Miller |
| CERN Management | Mr Jan-Paul Brouwer Dr Malika Meddahi Ms Lisette van den Boogaard |
| Staff Association | Mr Vincent Brillault Mr Christophe Delamare Mr Joel Lahaye |
| Ex-Officio Members | Professor Mark Thomson, Director-General Professor Costas Fountas, President of Council Professor Cristina Biino, FC Chair |
| Secretary | Mr Bertrand Salami |