Wallenberg family in Sweden (Investor AB stock). Why?: because they are successful, as compared to the appropriate Sweden stock market index.

Warren B for more than 10y now was not successful in outperforming the simple S&P500, and (integrity!) he even recommends to retail investors to just invest into a S&P500 index ETF (f.ex. VOO).
Wallenberg family in Sweden (Investor AB stock). Why?: because they are successful, as compared to the appropriate Sweden stock market index.
Warren B for more than 10y now was not successful in outperforming the simple S&P500, and (integrity!) he even recommends to retail investors to just invest into a S&P500 index ETF (f.ex. VOO).