On the subject of founder-managed companies and a performance comparison, I have only found the following certificate.
It includes family-run companies, but only from Europe.
The three largest positions are: $COLO B (-0.31%) , $EZJ (+2.38%) and $BC8 (+3.29%)
The performance clearly lags behind that of the Eurostoxx50! But I don't think that is representative enough.
But whether it is really an advantage that a company is run by its founder depends, I think, above all on the founder's vision and his openness to change.
