Can I own too many funds, and what is fund overlap?

Yes — owning many funds often creates the illusion of diversification while really just duplicating the same stocks. Fund overlap happens when several funds hold the same underlying companies. If you own an S&P 500 fund, a total-market fund, a large-cap growth fund, and a tech fund, you may hold the same handful of mega-cap names four times over, concentrating risk rather than spreading it. More funds also means more expense ratios and more to rebalance. A clean, fully diversified portfolio can be just three or four funds: a U.S. total-market fund, an international fund, a bond fund, and maybe a small tilt. Before adding any new fund, ask what exposure it gives you that you don't already own. Check your true holdings overlap at wealthserene.com/tools/portfolio-builder.