IBFR overlap analysis compares holdings with other ETFs to identify shared positions. Overlapping holdings can lead to unintended concentration risk in a portfolio.

IBFR portfolio overlap matters because owning multiple funds with the same underlying stocks reduces true diversification.

IBFR overlap tool lets you enter any other ETF ticker and see the exact overlap percentage and shared holdings. IBFR tax-loss harvesting finds highly correlated but non-identical funds.