What is ETF overlap?
ETF overlap happens when two or more ETFs own many of the same underlying stocks. When overlap is high, portfolios can look diversified by fund count but still behave like one concentrated bet.
Quick definition
ETF overlap happens when two or more ETFs own many of the same underlying stocks. When overlap is high, portfolios can look diversified by fund count but still behave like one concentrated bet.
Questions investors ask
Is ETF overlap always bad?
No. Overlap can be intentional if you want to overweight a theme or factor. It becomes a problem when overlap is accidental and pushes concentration beyond your risk plan.
How much ETF overlap is too much?
There is no universal cutoff, but very high overlap between core funds often means you are adding weight more than diversification. Review overlap alongside sector and top-holding concentration.
How can I check ETF overlap quickly?
Use a holdings look-through comparison tool, then review repeated top names and sector concentration. Guardfolio's ETF Overlap Checker is designed for this workflow.
Next step
Use the ETF Overlap Checker, run a free risk snapshot, and review the metrics methodology to connect definitions with your own portfolio.