See what your ETF portfolio really owns.
Look through every fund, uncover hidden stock and sector concentration, and track meaningful changes over time — without connecting a brokerage account.
Check my portfolio Monitor portfolio drift
Covers 74 US-listed ETFs and 6 European UCITS funds (CNDX, CSPX, EIMI, IWDA, VUAA, VWCE) — mix them freely.
Why look-through matters
Funds are wrappers; stocks are what you own. Two "different" ETFs often hold the same mega-cap names, so holding both concentrates — not diversifies — your portfolio. OverlapCheck reads the official holdings files and does the arithmetic for you: your combined stock exposure, your sector weights against the S&P 500, and how much of your money sits in funds that duplicate each other.
Holdings come from official fund issuer files and SEC filings, and each fund page shows its as-of date. Issuers publish on different schedules, so combining funds with different as-of dates can shift a number slightly. Nothing here is investment advice — see methodology for the formulas and known limitations.
Popular overlap checks — 🇺🇸 US-listed
🇪🇺 European UCITS
VWCE, IWDA, CSPX & friends — full holdings from official Vanguard and iShares 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) →