It's very well possible that I either did not understand how your answer relates to my question, or that my definition of "exit" (namely, that a company gets sold, usually to a larger entity, and is not held by founders anymore) is incorrect or too narrow, but, again, how is an exit compatible with a company being part of the Mittelstand?
You say "pre-Mittelstand", so I guess it's not about investing in companies that are aready Mittelstand (and effectively lifting them out of that) either.
But by definition if a company grows for decades it doesn't 'exit' (=it isn't sold or renamed or repurposed). So I think that the Mittelstand definition should prohibit an exit, maybe not for the individual (=founder/owner) but for the company as a whole. In my opinion this is why in german you don't really use the term for companies anyway except when econonomists look back and analyze your company history.
I begin to think that OP just took the word "Mittelstand" to mean "$10M-$1B", which at least to several other people in the thread is rather confusing.
You say "pre-Mittelstand", so I guess it's not about investing in companies that are aready Mittelstand (and effectively lifting them out of that) either.