A portfolio with 12 funds can look impressively diversified at first glance, especially when the account screen resembles a miniature financial supermarket. There are large-cap funds, international funds, technology funds, dividend funds, maybe a bond fund or two, and suddenly the portfolio feels like it has every aisle covered. The catch is that several of those funds may own many of the exact same companies, which means the portfolio can contain plenty of funds without containing much genuine diversification.
Diversification depends on what the investments actually own, not how many fund names appear on the screen. A dozen funds that all lean heavily toward the same companies, industries, or market segments can create a surprisingly concentrated portfolio. A little detective work can reveal whether those funds provide useful variety or simply wear different jerseys while playing for the same team.
