What about OpenSUSE, Ubuntu etc? Both European based firms.
Canonical (based in London) is not really "from the EU" anymore. ;-) No, I know what you mean...
However: Yes, those are European Linux distributors. They distribute an U.S. operating system kernel together with an U.S. userland (GNU), an U.S. init system (systemd), several U.S. desktops (most commonly, Gnome, although KDE is German, at least)...
If you get your Windows installation from an European distributor, is it a European product?
considering their (...) contributor network.
Microsoft has employees in Europe. Does that count? If it doesn't, why does it count for Linux?