Mutual Fund Overlap: Are You Buying the Same Stocks Multiple Times?

Imagine this: You’ve just finished setting up your investment portfolio. You’ve diligently selected five different mutual funds—perhaps a large-cap fund, a flexi-cap fund, an ELSS tax saver, and a couple of thematic funds. You lean back, satisfied, thinking you’ve built a beautifully diversified, rock-solid portfolio. After all, the golden rule of investing is “don’t put all your eggs in one basket,” right?

But what if, unbeknownst to you, four of those five funds are buying the exact same stocks?

What if you haven’t actually diversified your eggs into different baskets, but simply bought five different-colored baskets that all hold the identical eggs?

Welcome to the hidden trap of mutual fund portfolio overlap. For Indian retail investors, it is one of the most common—and costliest—mistakes made in the pursuit of financial security. It is incredibly easy to fall into this trap, mostly because our natural instinct tells us that owning more funds equals greater safety.

Let’s unpack what mutual fund overlap is, why it happens so frequently in India, and how you can ensure your portfolio is truly working for you rather than against you.

What Exactly is Mutual Fund Overlap?

In simple terms, mutual fund overlap occurs when two or more mutual fund schemes in your portfolio invest heavily in the same underlying companies.

When you buy a mutual fund, you aren’t buying a single magical asset; you are buying a proportional slice of a larger pie made up of dozens of stocks. If you invest your hard-earned money in Fund A and Fund B, and both of them hold significant chunks of Reliance Industries, HDFC Bank, Infosys, and TCS, your portfolio has an overlap.

While a tiny bit of overlap is natural, significant overlap leads to a phenomenon known as false diversification. You feel diversified because you see multiple fund names on your dashboard, but your actual capital is dangerously concentrated in a few specific companies.

Why Does Overlap Happen in India?

It’s easy to blame ourselves as investors for picking the wrong funds. However, the reality of the Indian stock market and regulatory structures naturally paves the way for portfolio overlap. Here is why it happens:

1. SEBI Categorization and “Blue-Chip” Bias

The Securities and Exchange Board of India (SEBI) defines strict guidelines for mutual fund categorization. A “Large Cap Fund” is mandated to invest at least 80% of its total assets in the top 100 companies by market capitalization. Because this pool is restricted to just 100 companies, any two large-cap funds from different Asset Management Companies (AMCs) are mathematically bound to buy the same giant companies.

However, the trap deepens with Flexi-Cap Funds. Although flexi-cap funds can invest across large, mid, and small-cap segments, fund managers often park 60% or more of their assets in large-cap stocks for stability and liquidity. Consequently, if you hold a dedicated large-cap fund and a flexi-cap fund, you are likely doubling up on the same Nifty 50 stalwarts.

2. The “Same-AMC” Trap

Investors often build their portfolios with multiple funds from the same Asset Management Company—for example, holding an AMC’s Large Cap, Flexi Cap, and ELSS funds. Because these funds share the same internal research team and investment philosophy, their stock selection often mirrors one another. It is common to see overlaps exceeding 50% between a large-cap and a flexi-cap fund from the same fund house.

3. The ELSS Tax Season Scramble

Every year between January and March, Indian investors scramble to save taxes under Section 80C by buying an Equity Linked Savings Scheme (ELSS). Many end up buying a new ELSS fund every year based on recent performance charts. Since most ELSS funds maintain a strong large-cap bias, these investors unintentionally accumulate massive portfolio overlap over just a few years.

Real-World Example: Flexi-Cap vs. Large-Cap

Let’s look at a practical scenario. Many investors love the Parag Parikh Flexi Cap Fund for its value-oriented approach and international exposure. Seeking to “diversify,” an investor might add a standard Nifty 50 Index Fund or a traditional large-cap fund to their portfolio.

While Parag Parikh Flexi Cap offers unique elements, it has historically maintained a significant allocation to prominent Indian large-cap stocks. When you compare it against a standard large-cap fund using an overlap tool, you might still find an overlap of 30% to 45%. You are essentially paying the active management fee (expense ratio) of the flexi-cap fund and the index fund’s fee to hold the same underlying blue-chip companies.

The Hidden Dangers of High Portfolio Overlap

If holding good companies isn’t inherently bad, why should you care about overlap? The danger lies in risk amplification and cost inefficiency.

1. You Magnify Your Risk (Concentration Risk)

The entire point of diversification is to protect your money if a specific sector takes a hit. If a regulatory change negatively impacts the banking sector, and 30% of all your different mutual funds are allocated to banks, your entire portfolio will bleed simultaneously. You lose the safety net that true diversification provides.

2. You Pay Multiple Fees for the Same Job

Every mutual fund charges an Expense Ratio. If you own three funds that all largely mimic the Nifty 50, you are paying three different fund managers to do the exact same job. This unnecessary fee duplication quietly erodes your net returns over time, compounding into lakhs of rupees lost over a 20-year investing journey.

3. Stifled Growth

Excessive overlap leads to uniform performance. When the market goes up, your funds go up together. But when it goes down, they fall together. You miss out on the opportunity to capture growth in uncapped areas, like promising mid-caps or agile small-caps, because your money is tied up in redundant large-cap loops.

How Much Overlap is “Too Much”?

While there are no hard limits for every combination, financial experts and recent SEBI guidelines (such as the 2026 rules capping overlap for thematic funds at 50%) provide a clear framework:

• Under 25% Overlap: Generally acceptable. Your funds are bringing unique value and true diversification.
• 25% - 50% Overlap: Moderate. It’s worth reviewing if both funds are truly necessary for your goals.
• Above 50% Overlap: High Risk. You are likely holding redundant funds and should seriously consider consolidating your portfolio to reduce overlapping costs.

[!NOTE] In most equity mutual funds in India, just the top 10 stocks can account for 30–40% of the entire portfolio’s weight! Always check the top holdings.

Actionable Steps for Indian Investors

If you suspect your portfolio is suffering from false diversification, don’t panic. It is a highly fixable issue. Here is how you can clean up your investments today:

1. Use a Portfolio Overlap Tool

You don’t need a complex spreadsheet. There are several free portfolio overlap tools available online (like Dezerv, PrimeInvestor, or ET Money) designed for Indian investors. Simply enter the names of your current funds to see the exact percentage of shared stocks.

2. Keep Your Fund Count Low

How many mutual funds should you really own? Financial advisors generally agree that 3 to 5 equity funds is the sweet spot. A well-diversified core portfolio might look like this:

• 1 Index Fund (e.g., Nifty 50): For stable, low-cost, large-cap exposure.
• 1 Flexi-Cap or Multi-Cap Fund: For dynamic stock selection across market caps.
• 1 Mid-Cap or Small-Cap Fund: For aggressive, long-term growth potential.

Adding a 6th, 7th, or 10th fund rarely adds meaningful diversification; it only adds clutter and overlap.

3. Consolidate Ruthlessly

If you discover a 60% overlap between your newly bought flexi-cap fund and your existing large-cap fund, it is time to make a choice. Pick the fund with the better long-term track record and lower expense ratio. Stop your Systematic Investment Plans (SIPs) in the redundant fund. You don’t necessarily have to sell your units immediately (always keep short-term capital gains tax and exit loads in mind), but redirect your future money to ensure a better balance.

The Bottom Line

We invest to build wealth and secure our futures, and it is completely normal to want to “play it safe” by buying multiple funds. However, true diversification is not about how many funds you own; it is about how different those funds are from one another.

Take 15 minutes this weekend to look under the hood of your portfolio. By identifying and eliminating mutual fund overlap, you will save on expense ratios, genuinely protect your downside risk, and take a massive step toward becoming a smarter, more efficient investor.

Remember, when it comes to mutual funds, more isn’t always better. Different is better.

See something that needs correcting? Read our editorial policy or email corrections@smartmoney.report with this article’s URL.