In Germany there are 3 companies, I heard in France 2 companies, I don't any in other parts of Europe but there are definitely but I suppose the European rocket start up pipeline is filled.
P. S. HN please tell me about your (European) nation's future rocket builder.
Sidereus' EOS is a miniature, reusable orbital launcher. Load it in a tuck, drive to a field outside town, launch it with your cubesat, then go pick it up at the local airport as it glides back down from space on its parafoil.
Also here is a non rocket space device from Germany
https://www.polaris-raumflugzeuge.de/
(I cant judge their seriousness, but they got funding by military)
P. S. HN please tell me about your (European) nation's future rocket builder.