ETF overlap calculator
Make every ETF earn its place.
See what your ETFs own together, test lower-overlap alternatives in your full portfolio, and monitor meaningful changes over time.
Portfolio look-through
Free analysis + one what-ifSee what you really own, where it repeats, and one change worth testing.
Covers 74 US-listed ETFs and 6 European UCITS funds (CNDX, CSPX, EIMI, IWDA, VUAA, VWCE). Mix them freely and weight each fund by the amount you hold.
Portfolio what-if
ETF positions only. Results use dated equity positions from official issuer files and SEC filings. Cash, derivatives, and other non-equity assets are excluded. See methodology for formulas and limitations.
Free holdings watch
Get an email when the holdings behind your ETFs change.
Issuers refresh holdings on their own schedule, and overlap moves with them. Save your tickers once; one email per update, with a link that recalculates the overlap on the new data.
- Any supported US or UCITS ETF, as many as you hold
- One email per holdings update, with old and new as-of dates
- A one-click link that recalculates the whole portfolio
- No account, no brokerage login, no card
Popular overlap checks: 🇺🇸 US-listed
🇪🇺 European UCITS
VWCE, IWDA, CSPX & friends, using dated equity positions represented in official Vanguard and iShares holdings files. New to UCITS overlap? Start with the guide for European investors.
Browse all funds and comparisons → · Which ETFs hold a given stock? → · ETF & stock max pain (on Quant Data) →