Portfolio Overlap: How Much Is Too Much?

Portfolio overlap is the proportion of holdings two mutual fund schemes have in common, measured by the weight of shared stocks rather than the count. Two large cap funds sharing eight of their top ten positions have high overlap, meaning the second fund adds far less diversification than the number of schemes suggests.

The threshold discussed here comes from SEBI's circular on Categorization and Rationalization of Mutual Fund Schemes dated 26 February 2026, with the cap applied to specific scheme categories rather than to an investor's whole portfolio. Category definitions come from SEBI's framework as operationalised by AMFI's published cap lists.

What this guide does not do is invent an investor-level threshold. No Indian regulator publishes one, and any blog quoting “overlap above 30% is bad” is stating an opinion in the grammar of a rule. Where the honest answer is “it depends on the pairing”, that is what is written.

SEBI's 26 February 2026 circular supersedes the earlier categorisation clause of the Master Circular and tightens what a scheme category may hold. Among its provisions, related categories are capped at 50% portfolio overlap—applied to sectoral and thematic schemes, and to the value and contra pair, so that two schemes from the same fund house cannot be near-copies wearing different names.

So it does not tell you whether your own four funds are too similar. What it does tell you is that the regulator now treats high overlap between related schemes as a structural problem worth capping—which is a meaningful shift in how the question is framed.

How much portfolio overlap is too much?

There is no regulator-set threshold for an investor's own portfolio. SEBI's February 2026 circular caps overlap at 50% between certain related scheme categories, but that applies to fund houses. For an investor, overlap matters relative to the category pairing: high overlap between two same-category funds is duplication, while the same figure across different categories may be unavoidable.

The same percentage means different things depending on which two funds produced it.

The structural reason is in the category rules themselves. A large cap fund must hold at least 80% of its assets in the top 100 companies by market capitalisation, and AMFI publishes that list twice a year, in accordance with SEBI's framework. Every large cap fund in India is therefore fishing in the same hundred-name pond. High overlap between two of them is not a failure of the managers. It is arithmetic.

If you want the full explanation of why this happens, read why different mutual funds hold the same stocks.

Overlap tells you what two funds share. It does not tell you what either one is doing that the index isn't.

For that, look at how far a fund's holdings and weights depart from its benchmark. A fund with low departure from its index is delivering index-like exposure at an active fee, whatever its overlap with your other funds. Two such funds in the same category compound the problem: you are paying twice for one exposure.

The question is rarely “is 55% too much?” It is usually “what am I getting from the second fund that the first one doesn't already give me?”

Not necessarily. Overlap measures holdings shared between two schemes, while diversification depends on your whole portfolio across categories, market caps and asset classes. High overlap between two same-category equity funds means duplication within that slice, but it says nothing about your allocation to debt, gold or international exposure.

Indian equity indices are concentrated at the top by construction, which means most large cap portfolios converge on the same leading names regardless of manager skill. Adding a fourth large cap fund does not fix that. It adds a fourth expense ratio to the same exposure.

Genuine diversification in this context comes from changing the category, not the fund house—moving across market capitalisation, style or asset class, rather than adding another scheme from the same pond.

1. 1Group by categoryGroup your funds by SEBI category first. Comparing a large cap with a small cap tells you nothing useful.
2. 2Check pairsWithin each category group, check overlap between pairs. The full method is in mutual fund overlap: what it is and how to check it.
3. 3Question duplicationWhere two same-category funds overlap heavily, ask what the second one is for—and if the answer is nothing, reduce the overlap in your portfolio.
4. 4Compare the benchmarkCheck how far each fund departs from its own benchmark before concluding the manager adds value.
5. 5Measure company exposureLook at your total exposure to individual companies across all funds—the concentration that matters is at the stock level, not the scheme level.
6. 6Repeat the reviewRepeat after any portfolio change, and after AMFI's half-yearly cap list update, which can reclassify companies without any business changing.

• SEBI's 26 February 2026 circular caps overlap at 50% for certain related scheme categories—the first numeric overlap rule in Indian mutual fund regulation.
• That cap binds fund houses, not investors; no regulator sets a threshold for your own portfolio.
• Judge overlap by the category pairing, because expected overlap differs sharply between pairings.
• High overlap between two large cap funds is structural: both must hold 80% in the same top-100 universe.
• Overlap alone is incomplete—check how far each fund departs from its benchmark.
• The concentration that matters is your total exposure to individual companies across every fund.