ETF and Mutual Fund Analysis
Overlap, Comparison, and Diversification for Your Portfolio
Holdings updated: August 12, 2026
ETF and Mutual Fund Analysis
Overlap, Comparison, and Diversification for Your Portfolio
Put the funds you actually hold into a portfolio, with the allocations you actually use, and see how much of it is the same money in the same stocks. Build up to five portfolios and check them side by side — a line-up whose funds all track the large-cap US market reads very differently from one that genuinely spreads.
This measures composition, not performance. It reads no returns, no ratings and no fees, so it cannot tell you which portfolio did better — only how much each one repeats itself.
Two examples are pre-loaded to show the contrast: three overlapping US large-cap funds, and a US fund paired with an international one. They are an illustration, not a selection, and naming them is not a recommendation.
Holdings computed from SEC EDGAR filings and fund sponsors’ published disclosures, last updated August 12, 2026. Every result carries the as-of date of the data behind it.
It is the allocation-weighted average of the overlap between every pair of funds inside one portfolio. For each pair, the engine takes the lower of the two portfolio weights for every stock they share and adds those minimums up — the same weighted-overlap measure the Compare tool uses. Those pair figures are then averaged, weighted by the allocations you set, so a 60% holding counts for more than a 5% one.
Compare answers “how much do these two funds overlap?” and names every stock they share. This answers “how much does my whole portfolio repeat itself?” and gives one number per portfolio, with allocations taken into account. Compare tops out at five funds because it shows every pair; here a portfolio can hold ten, because the output is one figure rather than a matrix.
No. It means the funds in it hold different stocks from one another, which is one property of a portfolio among many. It says nothing about returns, risk, cost, tax, or whether the mix suits you. Two funds that barely overlap can still both fall together, and a high figure is not automatically a problem if holding the same stocks is what you intended. The number describes the data; what to do about it is your decision.
Because the fund has no equity portfolio to compare. Money-market, bond and feeder funds, and single-asset trusts holding bullion or coin, have nothing to overlap with a stock portfolio, so they are named rather than silently dropped. The card always says how many of your funds were matched, and the score is measured across the matched funds only, with their weights scaled back up to 100%.
SEC EDGAR Form N-PORT filings, plus fund sponsors’ published daily holdings files for the ETFs whose sponsors publish them. Filing cadence differs by fund family, so a portfolio routinely mixes funds filed months apart — each result names the oldest filing behind it, because one number for a whole portfolio is only as current as its stalest input.
General Concepts
ETF overlap is what happens when two or more funds you hold own the same underlying stocks. If you buy several funds expecting to spread your money across different companies, but those funds hold largely the same names, the money sits in fewer companies than the fund count suggests — and each fund charges its own expense ratio on that same basket. The overlap percentage puts a number on how much of that is happening. What it means for any particular portfolio is for the holder to judge.
For every stock two funds share, the engine takes the lower of the two portfolio weights, then adds those minimums up. That is the standard weighted-overlap measure: it answers “how much of these two portfolios is literally the same money in the same stocks?”
Holdings are matched on regulatory security identifiers and resolved to tickers, so share classes and name variants still line up.
Three things, plus a posture:
And the posture: no accounts, no tracking, nothing to upgrade to. An independent data utility — it sells nothing.
The Tools
You name one fund you already hold, and every fund in the universe — ETFs and mutual funds — is ranked by how little its portfolio overlaps yours, weighted and identifier-matched on the same engine as Compare. It ranks on that one dimension only, reading no returns, no ratings and no fees, so the fund at the top of the list is the least-overlapping one rather than the best one. Funds with fewer than ten disclosed holdings are left out, because a handful of positions cannot be compared fairly against a full portfolio; how many were left out is shown with the results, along with how many were ranked. What to do with that information is your decision.
How much the funds inside one portfolio hold the same stocks as each other. You build a portfolio of up to ten funds with the allocations you actually use — up to five portfolios, side by side — and each gets a single figure: the allocation-weighted average of the overlap between every pair of funds in it, computed on the same engine as Compare. A lower number means the funds repeat one another less. It reads composition only, with no returns, ratings or fees involved, so it cannot say which portfolio performed better and neither is ranked above the other. Funds with no equity portfolio to compare — money-market, bond and feeder funds, and bullion or coin trusts — are named rather than quietly dropped, and the score is measured across the matched funds only.
Data & Coverage
Two public sources:
Every result shows the as-of date of the data behind it.
It varies by fund, and the as-of date ships with every result rather than being hidden. ETFs refreshed from sponsor daily files carry prior-close weights. Funds sourced from SEC filings carry the filing period’s date — SEC rules make those filings public roughly two months after the period ends. Overlap percentages move slowly, because portfolio weights drift gradually, so an eight-week-old snapshot still describes a fund’s shape well.
The universe is built from the SEC’s own catalogue of every registered US fund — all issuers, ETFs and mutual funds alike — so any fund that files portfolio disclosures is coverable, including QQQ. The structural exceptions are single-asset trusts (gold, silver, bitcoin vehicles such as GLD or IBIT), which hold bullion or coin rather than a portfolio of securities, so there is nothing to overlap. If a fund you hold is missing, tell us via the contact page — if it files with the SEC, it can be added.
Trust & Compliance
No. ETF & Fund Analysis is an independent data utility. Every number on it is computed from public regulatory filings and fund disclosures — what funds report they hold — and describes composition, never performance. The severity badges and rankings label what those numbers show. None of it is a recommendation to buy, sell or hold any security, and the site is not an investment adviser. What to do with the numbers is your decision.