08/06/2026
Higher volatility does not always mean higher portfolio risk.
Small cap stocks have historically been more volatile than large cap stocks. From January 1999 through June 2026, the annualized standard deviation of a global small cap index was 17.93%, compared with 15.30% for global large caps.
However, investors do not own asset classes in isolation. Small caps behave differently from large caps, which can provide valuable diversification when combined in a portfolio.
The result? Portfolios that included both large and small cap stocks experienced volatility levels similar to large caps alone, while returns increased as the allocation to small caps grew.
This is a key lesson from Modern Portfolio Theory: risk should be evaluated across the entire portfolio, not one investment at a time.
Return and volatility statistics are useful, but they never tell the full story on their own.