SEBI's Mutual Fund Overlap Disclosures Begin: What Diversification Really Means

The change that quietly takes effect this month

Somewhere between the headline-grabbing reforms of 2026 — new expense ratio structures, Life Cycle Funds, the scrapping of retirement and children's fund categories — one clause in a SEBI circular has been easy to miss. Starting this month, asset management companies are required to publish monthly reports showing how much their own schemes overlap with one another in terms of actual stock holdings. The requirement flows from a SEBI circular dated 26 February 2026 titled "Categorisation and Rationalisation of Mutual Fund Schemes," which reworked Clause 2.6 of the Master Circular for Mutual Funds and introduced, among other things, a formal ceiling on how similar two equity schemes from the same fund house are allowed to be.

Portfolio overlap is a simple idea: it measures the degree to which two funds hold the same underlying stocks. If a large-cap fund and a flexi-cap fund from the same AMC both hold Reliance Industries, HDFC Bank and Infosys as their top three positions, an investor who owns both may believe she has spread her risk across two products when in reality she owns one bet, wearing two labels. The specific trigger for this month is that fund houses must now disclose these category-wise overlap levels on their websites every month, giving retail investors and distributors, for the first time in a structured and recurring format, hard numbers instead of guesswork.

Why SEBI moved on this now

The regulator's concern was not new, but it had reached a scale that made continued silence untenable. India's mutual fund industry crossed Rs. 65 lakh crore in assets under management by early 2026, and by AMFI's count roughly 9.7 crore investor accounts were contributing to SIPs every month, with monthly SIP inflows touching Rs. 27,269 crore in June 2026. A market of that size, built substantially on retail savings routed through systematic investment plans, magnifies the cost of any structural flaw. SEBI's own analysis, echoed by independent research houses, found that fund pairs within the same category routinely showed overlap in the range of 25 to 55 per cent, with some pairs touching as high as 56 per cent, according to Value Research data cited in its coverage of the reform. Sectoral and thematic funds — schemes built around a single industry or investment idea — were identified as the sharpest offenders, because a fund house managing five or six such schemes has only a limited universe of eligible stocks to choose from, and ends up clustering into the same names across products.

This pattern has an industry name: closet indexing, where a fund marketed as offering a distinct strategy in practice behaves like a slightly repackaged version of another scheme the same AMC already sells. SEBI's new rule directly targets this by capping overlap for sectoral and thematic equity schemes at 50 per cent against other equity schemes in the same category and against most other equity categories, with large-cap funds specifically exempted because their mandate to hold at least 80 per cent in the top 100 companies by market capitalisation makes some convergence unavoidable. The overlap figure is computed quarterly, using the average of daily portfolio overlap values at the individual security (ISIN) level, as laid out in the annexure to the circular. Existing schemes that breach the limit have been given three years to realign, failing which they face a mandatory merger with another scheme of similar profile.

Diversification is a discipline, not a headcount

The behavioural mistake this reform is aimed at correcting is a familiar one to anyone who has watched retail portfolios accumulate over the years: the belief that owning more funds automatically means less risk. It does not. Diversification works only when the underlying holdings actually move differently from one another under stress. An investor holding five equity schemes that all lean heavily on banking, IT and a handful of large-cap names has not diversified; the schemes will fall together in the same quarter for the same reason, just with different fund manager names attached. Practitioners sometimes call this "diworsification" — adding funds without adding genuine risk spread, while paying multiple layers of expense ratio for the privilege.

The new monthly disclosures do not eliminate this risk on their own; no dashboard forces better decisions. But they do remove a long-standing information gap. Previously, an investor curious about overlap had to rely on third-party tools or manually compare factsheets, a task most retail investors, and even many distributors working with limited time, rarely attempted with any rigour. From this month, the comparison sits on the AMC's own website, updated monthly rather than left to memory or assumption.

What commentators are watching, and where views diverge

Not everyone treats this reform as transformative. Some market commentators, including analysis from Value Research, have argued that the headline change — a 50 per cent cap that took three years to phase in — is a modest structural fix, while the more consequential story is what investors do with the overlap data once it starts arriving. That commentary suggested a practical benchmark worth noting: since most fund pairs within a category naturally run 25 to 55 per cent overlap, figures meaningfully above that range, say beyond 60 per cent, may signal that a second fund is contributing little genuine diversification, though this threshold is one analyst's interpretation rather than a SEBI-mandated cutoff.

There is also debate about whether the reform goes far enough. SEBI itself has signalled it may extend a similar overlap ceiling to index funds and exchange-traded funds, particularly sectoral and thematic passive schemes, a proposal reported as still under industry consultation as of June 2026 and not yet finalised. Whether that extension materialises, and on what timeline, remains uncertain.

It is also worth placing this disclosure reform against a wider backdrop the regulator has flagged repeatedly through 2026: a shrinking pool of registered investment advisers — SEBI's own chairman noted the country has just around a thousand registered investment advisers relative to its expanding investor base — even as unregulated voices on social media increasingly shape retail decisions. Better disclosure data is only useful if investors, or the distributors and advisers guiding them, actually consult it rather than defaulting to whichever scheme is being promoted most loudly that month.

What this means in practice

For an existing SIP investor, the immediate effect of this month's change is informational rather than transactional: nothing compels an exit or a switch, and existing schemes continue to run. What changes is the availability of a concrete monthly figure showing how much any two equity schemes within a portfolio genuinely differ in their underlying holdings. Reading that figure alongside a scheme's category, mandate and stated investment objective — rather than its name or its recent return chart — is likely to be the more durable habit this disclosure encourages. Over the three-year compliance runway SEBI has built in for existing sectoral and thematic funds, the overlap numbers published each month offer a running scorecard of whether the industry's product shelf is becoming genuinely more differentiated, or whether the same handful of large, liquid stocks continue to dominate portfolios regardless of the label on the fund.