By WealthKit · 7 min read · Published Jul 2026 · Updated Jul 2026
It's one of the most common mistakes retail investors make in India: buying four or five mutual funds thinking they've diversified, only to discover — usually by accident — that all of them are quietly holding the same 15-20 large-cap stocks. This is called portfolio overlap, and it quietly undermines the entire point of spreading money across multiple funds.
Every equity mutual fund publishes a portfolio — a list of the stocks it holds and what percentage of the fund's assets each stock represents. Overlap is simply the degree to which two funds hold the same stocks, weighted by how much of each fund's assets those shared stocks represent.
If Fund A holds HDFC Bank at 8% and Fund B also holds HDFC Bank at 6%, that stock alone contributes to overlap between the two funds. Add up every stock both funds share, and you get an overlap percentage — the portion of each fund that's effectively duplicating the other.
A 20-30% overlap between two funds is common and usually not a concern — large-cap stocks like HDFC Bank, Reliance, ICICI Bank and Infosys show up in the top holdings of dozens of funds simply because they're the biggest, most liquid companies on the exchange. But when overlap climbs past 50-60%, you're not really holding two different funds — you're holding one fund's worth of stocks, twice, and often paying two sets of expense ratios for the privilege.
Overlap is especially common among funds in the same category — two large-cap funds, or two flexi-cap funds, are drawing from a similar universe of "investable" large companies, so some overlap is almost mechanical. It also happens across categories: a large-cap fund and a "different" flexi-cap fund from the same AMC often share a fund management philosophy and end up converging on similar names.
It also happens because investors pick funds based on trailing 1-year or 3-year returns without checking what's actually inside them. Two funds can have completely different names, different AMCs, different marketing — and still be 70% the same portfolio underneath.
Checking overlap manually means opening two funds' monthly portfolio disclosures — usually PDF or Excel files published on the AMC's website — and cross-referencing every stock by hand. For a fund holding 60-80 stocks, that's not realistic to do by eye, which is exactly why most investors never check at all.
WealthKit's Fund Overlap Checker does this automatically: pick any two funds, and it shows the overlap percentage by weight along with the full list of shared stocks and what each fund holds them at. It's built directly on the same monthly disclosures every AMC is required to publish, so the numbers reflect actual current holdings, not marketing copy.
High overlap isn't automatically wrong — if you deliberately want concentrated exposure to India's largest companies, that's a valid strategy. The problem is when it's accidental: you believe you're diversified across four funds when you're really just paying four expense ratios for one portfolio.
If you find significant overlap between funds you hold, the fix is usually to pick funds with genuinely different mandates — pairing a large-cap fund with a small-cap or sectoral fund typically produces far less overlap than pairing two large-cap funds from different AMCs, even though the second pairing looks more "diversified" on paper.
Put this into practice
Check Fund Overlap →SEBI requires every mutual fund to publish its complete holdings every month. Here is what those disclosures actually contain, and how to make sense of them.
You might hold five different mutual funds and still be dangerously concentrated in a handful of stocks or one sector, without realising it. Here's how that happens and how to check your real exposure.