Jimmy answered the question with this:

Depends on the metaphysics of concepts, and whose concepts. If concepts are taken to be useful or social constructs for instance, then we have nominalism, since concepts are not existent classes of things but just fictions useful for organizing according to the aims of individuals or mental patterns that inform the social game, or some such.

If concepts here refers to God’s concepts, then we’ve taken an Augustinian route, where the Platonic Forms have been nested in the eternal mind.

Or if we have an idealist metaphysic, where there isn’t anything except minds and mental content, then concepts are more real than the malformed idea of non-mental physical matter.