Portfolio Overlap: Are Your Mutual Funds Really Diversified?

Owning several schemes does not guarantee diversification, as mutual fund overlap can leave Indian investors exposed to the same stocks, sectors or styles across large-cap, flexi-cap and hybrid funds. The article explains how hidden concentration builds, why some duplication is natural, and why each fund should serve a distinct portfolio role.

Portfolio overlap can quietly turn a well-intended mutual fund portfolio into a concentrated bet. Many investors own four or five schemes and still remain exposed to the same Nifty heavyweights, sectors or investment styles.

The issue is not that common holdings are always bad. Some duplication is natural in Indian equity funds, especially among large-cap and flexi-cap schemes. The real question is whether every fund in your portfolio is adding a distinct role, or merely repeating what you already own.

What portfolio overlap means for mutual fund investors

At its simplest, portfolio overlap means two or more mutual funds hold the same underlying securities or offer very similar exposure. This can happen at the stock level, sector level, market-cap level, style level or theme level.

For example, a large-cap fund, a flexi-cap fund and an aggressive hybrid fund may all hold the same private banks, IT majors, energy companies and consumer stocks. The scheme names are different, but the investor’s effective exposure may be similar.

SEBI (Securities and Exchange Board of India) has also recognised this issue. In its February 26, 2026 circular on categorisation and rationalisation of mutual fund schemes, the regulator set out portfolio-overlap requirements for certain equity schemes. The intent is to improve product differentiation and transparency.

Investors should not treat any regulatory metric as a universal personal rule. A fund house requirement is different from an investor’s portfolio decision. Your goals, risk appetite, time horizon and asset allocation still matter most.

Why mutual fund portfolio overlap can hide risk

The biggest problem is hidden concentration. A fund may look diversified because it owns 60 stocks. But if three other funds in your demat-linked MF portfolio also own the same top 10 stocks, your total exposure may be far higher than you realise.

Suppose you invest 25% of your portfolio in Fund A, 25% in Fund B and 20% in Fund C. If all three hold Company X with weights of 8%, 7% and 6%, your indirect exposure to Company X becomes 4.15% of your total portfolio. That may be acceptable, but the risk grows if this pattern repeats across several companies.

Sector concentration is another concern. Two funds may not hold identical stocks, yet both may be exposed to financial services. One may own banks, another may own NBFCs (non-banking financial companies), while a third may hold insurers or exchanges. These holdings can react similarly to RBI rate changes, liquidity conditions, credit growth or asset-quality concerns.

Large-cap duplication is common in India. Large-cap funds, flexi-cap funds, large-and-mid-cap funds, multicap funds, value funds, focused funds and even some hybrid funds may all hold major Nifty and Sensex companies. Adding another scheme may not improve diversification if it simply increases exposure to the same market leaders.

Style duplication also matters. Two funds may hold different stocks but follow the same growth, quality, value or momentum style. In a market correction, they may move together even if their portfolios are not identical. This is why overlap and correlation are not the same. Overlap shows common holdings. Correlation shows how similarly two investments have moved historically.

How to check portfolio overlap before starting another SIP

A SIP (Systematic Investment Plan) is only a method of investing regularly. It does not guarantee diversification. Before adding another SIP, investors should review what they already own.

Use the latest monthly portfolio disclosures from AMCs (asset management companies), scheme factsheets and AMFI-related sources. Always check the portfolio date because fund holdings change. The Scheme Information Document and KIM (Key Information Memorandum) explain the mandate, but current holdings are available only through portfolio disclosures.

A practical review should include:

• List all schemes, their current value, category, benchmark and role in your portfolio.
• Compare the top 10 holdings of each equity mutual fund.
• Check common stocks and compare their weights, not just their names.
• Calculate your effective exposure by multiplying your fund allocation with the stock weight in each fund.
• Review combined sector exposure, especially financials, IT, energy, consumer and healthcare.
• Check large-cap, mid-cap and small-cap exposure across all schemes.
• Ask whether the new fund fills a real gap or simply repeats an existing strategy.

A simple weighted-overlap method is to identify common stocks between two funds, take the lower weight for each common stock, and add those weights. For example, if Fund A holds a stock at 8% and Fund B holds it at 5%, the overlap contribution is 5%. This is useful for analysis, but official regulatory methodology should be followed wherever applicable.

Investors can also use research platforms such as Morningstar India, Value Research and Moneycontrol Mutual Funds, while cross-checking the data date with AMC disclosures.

How much portfolio overlap is too much?

There is no magic number. A 30% overlap is not automatically safe, and a 50% overlap is not automatically dangerous. Context is critical.

High duplication may be acceptable if an investor deliberately uses a low-cost index fund as the core holding and a small active fund as a satellite allocation. It may also be reasonable when two funds have different risk levels, different portfolio construction methods or different roles.

It becomes a concern when the investor is unaware of the duplication. If five funds all favour the same large-cap growth stocks, the portfolio may behave like one concentrated strategy. If several schemes are exposed to the same sector theme, such as infrastructure, manufacturing, defence or financialisation, the investor may be taking a bigger thematic bet than intended.

The better question is not, what is the overlap percentage? The better question is, after combining all my mutual funds, am I taking an exposure I did not intend to take?

This is especially important for investors who keep adding new SIPs based on recent returns. Past performance may reflect temporary leadership by a stock, sector or style. Buying another top-performing fund can increase duplication rather than improve risk-adjusted returns.

What portfolio overlap means for you

For most retail investors, the aim should not be to eliminate every common holding. That is neither practical nor necessary. The aim is to build a portfolio where every fund has a clear purpose.

A core equity portfolio may need only a few well-chosen schemes across categories such as index, flexi-cap, mid-cap or hybrid, depending on the investor’s goals and risk profile. Sectoral and thematic funds should usually be satellite allocations, not substitutes for diversified equity exposure.

Review duplication whenever you add a new scheme, change SIP amounts, rebalance your portfolio or approach a major financial goal. Also consider expense ratios, exit loads, taxation and the impact of redeeming before making changes.

The takeaway is simple. More funds do not automatically mean more diversification. Understand what you own collectively, identify unintended concentration and ensure that each scheme earns its place in your portfolio.

This article is for investor education only and is not personalised investment advice. Read the latest scheme documents and consider consulting a SEBI-registered investment adviser before making portfolio changes.