IKEA is still Swedish despite being incorporated in The Netherlands and having all their "charities" in The Netherlands. For companies of that size, being incorporated somewhere is just an administrative trick to lower taxes. The same way I structured my mortgage to maximise tax returns.

Volvo Cars has been bought by Geely. That is not comparable.

No the parent companies are always incorporated in the US, usually in Deleware.

They funnel all of their foreign profits through various tax shelter subsidiaries in Ireland and similar locations.

Meta, Amazon, Alphabet, and Netflix are all incorporated in Deleware, Apple is incorporated in California.

Are they owned by the Irish?