Again, this is an article about German startups. But you claim that this also applies to established mid-sized (usually family-owned) companies that are the opposite of startups: They have successfully saturated the demand for the niche that they are specialized in and neither potential nor interest in expanding further (within their niche, at least). So far, you have provided no justification for your claim, besides ”surely, no one would refuse a lot of money“.
What are you talking about? Are you honestly telling me that there are no US companies investing (buying) companies in Germany?
https://www.handelsblatt.com/finanzen/banken-versicherungen/banken/fusionen-und-uebernahmen-deutsche-start-ups-beweisen-sich-als-beliebte-uebernahmeziele-vor-allem-in-den-usa/28188238.html
Again, this is an article about German startups. But you claim that this also applies to established mid-sized (usually family-owned) companies that are the opposite of startups: They have successfully saturated the demand for the niche that they are specialized in and neither potential nor interest in expanding further (within their niche, at least). So far, you have provided no justification for your claim, besides ”surely, no one would refuse a lot of money“.
I consider it really odd how defensive and weird some people get with this. Is this a matter of personal pride?
And regarding your question: a 10 second google search will provide you with enough material.
Example (German): https://www.capital.de/wirtschaft-politik/das-sind-die-zehn-groessten-mittelstaendler-in-investorenhand-113694