Building a Concentrated Growth Portfolio

Fisher never owned more than thirty stocks in his life, and his best returns came from periods when he owned fewer than ten. His argument: if you genuinely understand a business deeply, there is no reason to dilute it with your fortieth-best idea.

Why This Matters

Most institutional and individual growth investors hold too many positions. The justification is risk management — diversification protects against individual failures. The reality: beyond 12–15 thoroughly researched positions, additional positions add almost no risk reduction while systematically diluting the return contribution from the investor's best ideas. True growth portfolio construction is an exercise in deliberately concentrating capital in the handful of situations where analytical edge and business quality are both highest.