In total 20 countries are member of a pre-exascale consortium. Each consortium will install a +200 Petaflop/s supercomputer by the end of next year. In addition, 6 countries participate in petascale consortia for 5 smaller supercomputers. There is some overlap. Taking that into account, there are 22 countries out of the 29 EuroHPC that are committed to either a pre-exascale or a petascale EuroHPC supercomputer.
Germany and France confirmed their intention to work on the aquisition of an exascale supercomputer in a next funding round. So 5 EuroHPC countries do not have, or did not reveal, plans to participate in a EuroHPC supercomputer hosting consortium.
We have a page with more information about the pre-exascale and petascale systems: