Fund overlap: are you diversifying or doubling down?

The problem

Owning five funds feels safer than owning one. But if the five funds own the same stocks, you have five fee-charging wrappers around one portfolio. That is the overlap problem, and it is common: fund categories are defined by company size, and the largest Indian companies appear in almost every diversified fund.

The figures here use the AMCs' own monthly portfolio disclosures for 31 August 2026, matched stock by stock using ISIN codes. Only funds with at least 90% in equities are included, so cash-heavy funds don't make the overlap look smaller than it is.

How overlap is measured

For every stock two funds both hold, take the smaller of its two weights, then add those up. If Fund A has 8% in ICICI Bank and Fund B has 5%, they share 5% through that stock. Do that for every common holding and you have the overlap.

• Below 20%: the funds are largely different.
• 20–40%: meaningful common ground, but still distinct.
• Above 50%: half or more of your money in each fund is doing the same job.

These bands are a rule of thumb, not a standard.

Overlap by category pair

We compared every pair of funds across six diversified equity categories. The table shows the median overlap for each combination, and the highest single pair.

What the table says

Two large-cap funds are the clearest case of doubling down. The median pair shares half its portfolio. That follows from the rules: SEBI requires large-cap funds to keep at least 80% in the 100 largest companies, so every fund fishes in the same small pond. A second large-cap fund adds a second manager's views on the edges of the portfolio, but most of the money ends up in the same banks, IT companies and consumer names.

A large-cap fund and an index fund overlap even more. We compared each of 35 active large-cap funds with the portfolio of a Nifty 50 index fund (all of them hold the same 50 stocks). The median overlap was 59.2%, ranging from 46% to over 80% for funds with at least 90% in equities. For the five largest large-cap funds by assets, it ran from 52.1% to 69.8%. Holding both is a common pattern, and it means paying an active fee on a portfolio that is more than half index.

Flexi-cap funds lean large. A flexi-cap fund can buy any size of company, but in practice most hold a large share in the biggest names. That is why a flexi-cap and a large-cap fund overlap by a median 34.1%, and one pair by 75.3%. Our look at overlap among the six largest flexi-cap funds found pairs sharing 21% to 40%.

Small-cap funds are the most different from each other. Two small-cap funds share a median 15.4%, because there are hundreds of small companies to choose from. That makes the choice of small-cap fund matter more, since the funds really do own different things. It also means their returns differ more; see small-cap fund portfolio concentration.

Different sizes rarely overlap. A large-cap fund and a small-cap fund share a median 3.0%. Combining funds from different size segments is the most direct way to add genuine variety.

Overlap is not the only thing to check

Low overlap does not by itself mean a portfolio is well built. Three funds with no stocks in common can still be heavily in one sector, or all be small-cap funds that fall together in a bad year. Stock overlap measures duplication; it doesn't measure risk. Check the sector mix too, which differs sharply by fund size, as our sector mix comparison shows.

And some overlap is fine. If you deliberately hold two flexi-cap funds with different styles, a 25% overlap is the price of having two managers. The problem is overlap you didn't know about, paid for twice.

A quick self-check

1. List your equity funds by category. If two are in the same category, especially large cap, they probably overlap heavily.
2. Look at the top ten holdings of each. If the same five or six names appear in each fund's top ten, you are holding the same core several times.
3. Ask what each fund does that the others don't. If you can't answer, one of them may be redundant.
4. Consolidate gradually. Selling a fund to reduce overlap can trigger capital gains tax and exit loads. Moving new SIPs first, and redeeming older units when they become tax-efficient, is often cheaper.

For most investors, three or four well-chosen equity funds across different segments do the work that eight overlapping ones cannot. Our guides on how many funds you need and cleaning up a messy portfolio go through the steps.

This post is for education only and is not investment advice. Past returns do not predict future returns.