As Paul Graham has emphasized before, virtually all of your financial return is in a teeny number of companies. IIRC just AirBnB and Dropbox account for a large

As Paul Graham has emphasized before, virtually all of your financial return is in a teeny number of companies. IIRC just AirBnB and Dropbox account for a large majority of return over ALL yc companies, and the number of companies that make up something like 95% of the total return can be counted on one hand.