A portfolio can contain multiple ETFs, funds and individual stocks yet remain heavily concentrated in the same companies, sectors and economic drivers. Learn how to identify hidden portfolio overlap, calculate your true underlying exposure and distinguish deliberate concentration from accidental duplication.

Many investors believe they own a diversified portfolio because they hold multiple ETFs. In reality, they often own the same companies repeatedly through overlapping funds. This hidden duplication can increase concentration risk, distort allocation decisions, and create a false sense of diversification. In this guide, we show how to identify ETF overlap, measure its impact on your portfolio, and understand why Structured Compounders actively monitor overlap while Conservative