Mutual Funds
How much mutual fund overlap is too much?
Answer
There is no regulatory threshold. As a working guide, two funds overlapping above roughly 70% are substantially the same exposure and the second is unlikely to be earning its cost, while below about 30% they are doing genuinely different things. But the pairwise figure is the less important one: what matters is the share of the whole portfolio sitting in its largest look-through holdings, because a portfolio can show modest overlap between every pair of funds and still be concentrated once the weights are added up.
Why no threshold exists
SEBI regulates what a scheme may hold, not how much two schemes may have in common. No Indian regulation sets an overlap limit, and no fund house discloses one, because overlap is a property of a portfolio rather than of a fund. The same 65% overlap is acceptable in one portfolio and a problem in another depending on what else is held and what the investor thought they were buying.
Any figure presented as a universal limit — including the ones below — is a heuristic. The defensible version of the question is not "is 65% too much" but "what is this second fund adding, and is it adding enough to justify its cost".
Reading a pairwise overlap figure
Below 30%: the two funds are doing meaningfully different things. Holding both is diversification.
Between 30% and 60%: they share a core and differ at the edges. This is the normal range for two well-chosen funds in adjacent categories, and it is also where genuinely redundant pairs hide. Whether it is fine depends on whether the differing 40% is an exposure you wanted.
Between 60% and 80%: most of the second fund is the first fund. It can still be justified — a lower expense ratio, a manager you prefer, a tax position you do not want to disturb — but the justification has to be something other than diversification.
Above 80%: the two are one exposure held twice, with two expense ratios and two sets of paperwork.
The number that matters more
Pairwise overlap is a comparison between two funds. An investor's risk is a property of the whole portfolio, and the portfolio-level question is: after resolving every fund to its holdings and summing the weights, what share of the portfolio is in its top ten companies, and what is the largest single-company weight.
These can be high even when no two funds look particularly similar. Four funds that each overlap the others by only 40% can still all hold the same five large Indian companies near the top of their portfolios, which is enough to put a substantial share of the portfolio into those five names.
A working test
- Compute look-through weights. Resolve every fund to its holdings and sum each company across funds, weighted by each fund's share of the portfolio.
- Check the top ten. Note what share of the portfolio the ten largest look-through holdings represent, and whether that is a share you would choose deliberately.
- Check the largest single name. One company above a weight you would not knowingly hold directly is a finding regardless of how it arrived.
- Ask what each fund adds. For every pair above 60% overlap, name the exposure the second fund contributes that the first does not. If the answer is "a different fund manager", that is a position, not diversification.
- Fix with contributions first. Redirecting new money changes weights without realising gains. Selling is a tax decision and belongs in a separate calculation.
How Vestmind measures this
VestFolio reports pairwise overlap for every fund pair, the portfolio's look-through top holdings, and the largest single-company exposure, with the funds that contribute to each. Thresholds are assessed against the investor's own portfolio rather than a universal limit, and every finding shows the holdings and the arithmetic behind it. See the portfolio analysis methodology.
Related questions
Is 50% overlap between two funds bad?
Not inherently. At 50% the two funds share a core and differ meaningfully at the edges, which is the normal range for well-chosen funds in adjacent categories. The question is whether the differing half is an exposure you wanted. If the second fund exists only because it was well reviewed at the time, 50% overlap means you are paying two expense ratios for roughly one and a half exposures.
How many mutual funds should I hold?
Fewer than most portfolios contain. Beyond roughly four to six equity funds with genuinely different mandates, additional funds usually add overlap rather than diversification, because they draw from the same universe under similar constraints. The count is the wrong variable to optimise: two funds with distinct mandates diversify a portfolio more than eight large-cap funds do.
Does overlap matter if all the funds perform well?
It matters more, not less. Overlap means the funds will tend to perform similarly, so a period in which they all do well is also a period in which they would all do badly together. The risk overlap creates is invisible exactly while the shared exposure is working.
Sources
- SEBI — Categorization and Rationalization of Mutual Fund Schemes — defines the scheme categories and what each may hold
How Vestmind does this
VestFolio is Vestmind's AI portfolio analysis product. It reads an Indian investor's holdings — stocks, mutual funds and ETFs — and reports what the portfolio is actually exposed to: concentration, mutual fund overlap, sector and factor tilts, asset allocation drift and the risks those create.