If you invest in mutual funds, chances are you've been told to diversify by spreading money across multiple schemes. It sounds like sound advice, and it usually is. But here's something many investors overlook: owning several mutual funds doesn't automatically mean you're well diversified. In many cases, those funds end up holding many of the same stocks, which means your portfolio is more concentrated than it appears on paper. This is called mutual fund portfolio overlap, and understanding it can help you make more informed decisions when you invest in mutual funds.
This blog explains what portfolio overlap means, why it happens, how to identify it, and what you can do about it.
What Is Mutual Fund Portfolio Overlap?
Mutual fund portfolio overlap refers to the extent to which two or more mutual funds hold the same underlying stocks or securities. If you invest in three different equity funds and all three have significant holdings in the same five or six companies, your portfolio overlaps across those funds. Instead of getting the benefit of diversification, you end up with concentrated exposure to a smaller set of stocks or sectors than you might realize.
This is a common situation when investors choose mutual funds online without checking the underlying portfolio composition of each scheme. Many funds, even with different names and stated strategies, often invest in similar large-cap stocks because these stocks are widely tracked and considered fundamentally strong.
Why Does Portfolio Overlap Happen?
- Similar fund categories: Funds within the same category, such as large-cap or flexi-cap funds, tend to draw from a similar universe of stocks. Since the pool of large, well-established companies is limited, multiple fund managers may pick the same names.
- Benchmark-driven investing: Many funds are benchmarked against indices like the Nifty 50 or Sensex. To avoid straying too far from the benchmark, fund managers often hold a similar set of index-heavy stocks, which increases overlap across funds tracking similar benchmarks.
- Popular or "consensus" stocks: Certain stocks are widely regarded as strong performers across sectors like banking, IT, or FMCG. Multiple fund managers, working independently, may arrive at similar conclusions about these stocks, leading to natural overlap.
- Same fund house, different schemes: Sometimes investors hold multiple schemes from the same asset management company. Since these schemes may be managed by overlapping investment teams or follow a similar research process, their portfolios can show meaningful overlap.
Why Should Investors Care About Overlap?
The main purpose of diversification is to reduce risk by spreading investments across different assets, sectors, and companies. When portfolio overlap is high, this purpose gets defeated in a few ways:
- Concentration risk increases. If multiple funds hold the same stock and that stock underperforms or the company faces a setback, the impact on your overall portfolio gets repeated across each fund.
- Diversification benefits reduce. You may believe you've diversified your mutual fund investment by adding more schemes, when in reality your money is tracking similar performance patterns.
- Portfolio rebalancing becomes less effective. If your funds move in the same direction due to overlapping holdings, your portfolio may not respond to rebalancing or asset allocation strategies the way you expect.
This doesn't mean overlap is always bad. Some overlap is natural and unavoidable, especially within the same fund category. The concern arises when overlap is excessively high across most of your portfolio, leaving you with limited real diversification despite holding multiple schemes.
How to Check for Portfolio Overlap?
- Review the fund's portfolio disclosure. Mutual funds are required to disclose their portfolio holdings monthly. This information is available on the fund house's website and on platforms where you invest in mutual funds online.
- Compare top holdings across your funds. Look at the top 10-15 stocks in each fund you hold. If the same names appear repeatedly across multiple funds, that's a sign of overlap.
- Use overlap-checking tools. Several investment platforms and financial websites offer mutual fund overlap calculators where you can input two or more schemes and see the percentage of common holdings as well as common sectors.
- Check sector allocation, not just stock names. Even if individual stocks differ, heavy concentration in the same sector (for example, multiple funds being overweight on banking and financial services) can also reduce diversification.
How to Manage or Reduce Overlap?
- Diversify across categories, not just fund names: Instead of holding multiple funds within the same category, consider spreading investments across categories such as large-cap, mid-cap, small-cap, and debt funds. This naturally reduces overlap since these categories invest in different segments of the market.
- Avoid over-diversification: Holding too many funds doesn't necessarily improve diversification, it often increases overlap and makes the portfolio harder to track. A focused set of well-chosen funds across different categories is usually more effective than a large number of similar funds.
- Review periodically: Fund portfolios change over time as fund managers adjust holdings. What had low overlap a year ago may show higher overlap today. Periodic review helps you stay informed.
- Consider your overall financial goals: Portfolio overlap should be assessed in the context of your broader investment strategy. A certain degree of overlap may be acceptable if your funds are otherwise serving different purposes, such as one focused on long-term growth and another on income generation.
A Few Things to Keep in Mind
- Portfolio overlap is a useful concept for evaluating diversification, but it's just one factor among many. Past performance, expense ratios, fund manager track record, and your own risk appetite and goals matter just as much.
- Mutual fund investments are subject to market risk. Overlap analysis does not eliminate investment risk; it only helps you understand the structure of your existing portfolio better.
- This article is intended for general informational purposes and should not be treated as personalised investment advice. It's a good idea to consult a registered financial advisor or do thorough research before making investment decisions.
Conclusion
Diversification is one of the central reasons people choose to invest in mutual funds, but simply holding multiple schemes doesn't guarantee it. Mutual fund portfolio overlap can quietly undermine your diversification strategy if you're not paying attention to what's actually inside each fund. Taking the time to check overlap, whether through portfolio disclosures or dedicated tools, can help you build a more genuinely diversified mutual fund investment portfolio that aligns with your financial goals.
