Mutual Fund Overlap Calculator

What Is Mutual Fund Overlap and Why Indian Investors Must Check It

Mutual fund overlap occurs when two or more funds in your portfolio hold the same underlying stocks. You invest in four different funds expecting four different portfolios. You may be holding one portfolio four times over, paying four expense ratios for the privilege.

This is not a theoretical risk. As of late 2025, Parag Parikh Flexi Cap and HDFC Flexi Cap – India's two largest flexi cap funds managing over Rs 2 lakh crore between them – share ownership of 20 common stocks including HDFC Bank, ICICI Bank, Infosys, Bharti Airtel, Axis Bank, TCS, and Reliance Industries. Research on the top 100 popular Indian equity funds shows the average pairwise overlap between two funds in the same category is 38% for large cap funds and 29% for flexi cap funds. In extreme cases, two funds from different AMCs can share 60-72% of their portfolios.

Why Mutual Fund Overlap Happens in India: The SEBI Category Problem

The root cause is SEBI's categorisation mandate introduced in 2018. Large cap funds must invest at least 80% of their corpus in the top 100 stocks by market capitalisation. The Nifty 50 alone accounts for 80% of India's total market cap. The Nifty 50 has only 50 stocks. Every large cap fund – all 34 of them – must fish from the same pond of 100 stocks. The result is structural overlap. Reliance Industries, HDFC Bank, ICICI Bank, Infosys, and TCS appear in virtually every large cap fund at similar weights because every fund manager is mandated to hold them.

Flexi cap funds are allowed to invest across all market caps, but most managers anchor heavily to large caps. ELSS funds and multi cap funds face similar constraints. The investible universe is simply too small for 34 large cap fund managers to build genuinely different portfolios. This is why holding "multiple diversified funds" often means holding the same 15 stocks through multiple fund managers.

Diworsification: The Term Every Indian SIP Investor Should Know

Diworsification – diversification that makes things worse, not better – is what happens when you add more funds without reducing concentrated exposure. It was coined by fund manager Peter Lynch, and it perfectly describes what most Indian retail investors do. You add a second large cap fund to diversify, but you have just doubled your exposure to HDFC Bank, ICICI Bank, and Infosys. You feel more diversified because you own more funds. You are not. You are paying two expense ratios to hold one portfolio, and when the banking sector falls, both your funds fall simultaneously. This is the false sense of safety that makes diworsification dangerous.

How Mutual Fund Portfolio Overlap Is Calculated

There are two methods used in practice. The simpler method counts overlapping stocks: if Fund A holds 60 stocks and Fund B holds 55 stocks, and 21 stocks appear in both, the overlap is 21 common stocks. This calculator uses a broader definition: the proportion of unique stocks across all selected funds that appear in more than one fund. If your two funds collectively hold 80 unique stocks and 21 of them are held by both, the overlap is approximately 26%.

A more sophisticated method uses weighted overlap: if HDFC Bank is 8% of Fund A and 6% of Fund B, the contribution of HDFC Bank to portfolio overlap is 6% (the lower weight). Summing this across all common stocks gives you a weighted overlap percentage that accounts for position size, not just stock count. This HisabhKaro calculator shows you both the stock count and individual weights per fund so you can assess overlap at both levels.

What Overlap Percentage Is Actually Acceptable?

There is no universal threshold, but broadly accepted guidelines for Indian equity funds are: below 33% overlap is healthy diversification; 33-55% is moderate and warrants review; above 55% means one fund is largely redundant; above 70% is very high overlap and consolidating is almost certainly correct. Note that some overlap is inevitable and acceptable, especially between funds in related categories. A large cap fund and a flexi cap fund will naturally share 30-40% of holdings. What matters is whether the overlap is intentional and whether the second fund is adding something genuinely new to your portfolio.

Real Portfolio Overlap Examples from India: What the Data Shows

HDFC Flexi Cap + Parag Parikh Flexi Cap: 20 common stocks including all major private sector banks, top IT companies, and diversified industrials. Despite being managed by very different philosophies, the large cap core is nearly identical. Parag Parikh adds global stocks (Google, Meta, Amazon), which creates some differentiation, but the India equity portion overlaps heavily.

HDFC Flexi Cap + HDFC Top 100: 72% overlap according to PrimeInvestor analysis. Holding both from the same AMC in related categories is one of the most common portfolio mistakes in India. You own one portfolio through two HDFC expense ratios.

Quant Active + Quant Flexi Cap: approximately 60% overlap. Same AMC, similar investment philosophy, different category names.

Multiple large cap funds: Any combination of 3 large cap funds from different AMCs will typically show 50-65% common holdings because the investible universe forces convergence. ICICI Pru Bluechip, Mirae Asset Large Cap, and SBI Bluechip all hold Reliance, HDFC Bank, ICICI Bank, Infosys, TCS, and Bharti Airtel in their top 7-10 positions.

The Expense Ratio Cost of High Overlap

High portfolio overlap has a direct, calculable cost beyond psychological discomfort. If you hold two large cap funds each with a 1.5% expense ratio direct plan (or 2% regular plan), and they are 65% overlapping, you are paying 2x the cost to manage the same 65% of your equity exposure. On a corpus of Rs 50 lakh, that is Rs 1.5 lakh per year in additional fees for zero additional diversification. Over 20 years at 12% CAGR, the compounded cost of this fee duplication is over Rs 18 lakh in foregone returns. Check the expense ratio guide to see how this compounds.

How to Fix High Mutual Fund Overlap: A Step-by-Step Approach

First, use this overlap calculator to identify your highest-overlap fund pair. Do not guess – check the actual holdings data. Second, of the overlapping pair, identify which fund has the lower expense ratio and stronger long-term track record. Third, exit the more expensive or weaker-performing fund over the next 1-2 months (avoid exiting in a single transaction if the corpus is large, to manage tax impact). Fourth, redirect the proceeds into a genuinely different category: a mid cap fund gives you exposure to Nifty 150 stocks not in Nifty 50; a small cap fund gives you the Nifty 250+ universe; an international fund gives you complete non-correlation with Indian equities.

One important tax note before switching: exiting a fund to fix high overlap triggers capital gains tax. If you held equity funds for more than one year, gains above Rs 1.25 lakh are taxed at 12.5% LTCG. Use the LTCG tax on mutual funds guide or the capital gains calculator to calculate your exact tax liability before making the switch. If you are also on regular plans, read the direct vs regular fund guide before restructuring. A true 3-fund India portfolio that minimises overlap by design: one large cap index fund (Nifty 50, 0.1-0.2% TER) + one active mid cap fund + one small cap or international fund. These three funds by definition cannot have significant overlap because they invest in completely different market cap segments. Check the SIP strategy guide for how to allocate across these categories based on your risk profile. Once you fix overlap, use the portfolio rebalancing calculator to set the right allocation split and when to rebalance annually.

3 Real-Life Mutual Fund Overlap Scenarios Every Indian Investor Should Know

Abstract percentage numbers only become meaningful when you see them applied to the actual funds in your portfolio. Here are three scenarios based on real disclosed fund holdings that illustrate exactly how portfolio overlap plays out in practice.

Scenario 1: The Classic SIP Investor with Two Flexi Cap Funds

Rahul, a 32-year-old IT professional in Pune, runs three SIPs: Rs 5,000 per month into HDFC Flexi Cap, Rs 5,000 into Parag Parikh Flexi Cap, and Rs 3,000 into Axis Bluechip. He believes he is well diversified because the fund houses are different and the fund names are different.

When you run these three funds through a portfolio overlap check, here is what you find: HDFC Flexi Cap and Parag Parikh Flexi Cap share 20 common stocks as of late 2025, including HDFC Bank (7.4% in HDFC, 7.7% in PP), ICICI Bank (8.7% in HDFC, 3.9% in PP), Infosys, Bharti Airtel, and TCS. Axis Bluechip adds further overlap on the same large cap names. Rahul is effectively concentrating Rs 3,600 annually into the banking sector alone – across three funds that all love HDFC Bank. His expense ratios: Rs 13,000 per year on a Rs 1.56 lakh annual SIP. A simple restructure to one large cap index fund (0.1% TER, Rs 156 per year) plus one genuine mid cap fund would save Rs 10,000+ per year in fees and deliver real diversification.

Scenario 2: Same AMC, Different Fund Names – The Highest Overlap Trap

Priya, a 40-year-old teacher in Chennai, holds HDFC Flexi Cap and HDFC Top 100 based on her bank's recommendation. Both are from HDFC Mutual Fund, both are highly rated, and both are in her long-term SIP portfolio. She assumed that HDFC's two flagship funds must be different.

The reality: HDFC Flexi Cap and HDFC Top 100 have approximately 72% portfolio overlap, according to PrimeInvestor's analysis. Their top positions – HDFC Bank, ICICI Bank, Infosys, Reliance Industries, Axis Bank, and TCS – are virtually identical in both funds. Of every Rs 100 Priya invests, Rs 72 is going into the same stocks through two fund managers at two expense ratios. If Priya had held just HDFC Top 100 and redirected the second SIP into a Nifty Midcap 150 Index Fund, she would have reduced her banking sector concentration and accessed 150 additional companies that neither fund currently gives her.

Scenario 3: The Aggressive Investor with Five Funds and Zero Diversification

Vikram, 27, a finance professional in Bengaluru, holds five equity funds: Quant Small Cap, Quant Active, Quant Flexi Cap, Nippon India Small Cap, and Axis Small Cap. He chose them based on trailing 1-year returns and multiple 5-star ratings. He is investing Rs 25,000 per month across these five SIPs.

The problems stack up fast. Quant Active and Quant Flexi Cap share approximately 60% of their holdings. All three Quant funds share heavy overlap in their top positions. His two "different" small cap funds (Nippon and Axis) will show meaningful overlap in the top small cap companies. The result: five funds, three expense ratios averaging 1.2% on Rs 3 lakh per year, and genuinely perhaps only 2-3 independent sources of return. A 3-fund structure – one Quant fund of choice, Nippon India Small Cap, and a Nifty 50 Index Fund – would give Vikram more real diversification at lower cost, and far less monitoring overhead.

The Common Thread in All Three Scenarios

Every scenario above involves investors who made rational, defensible choices – choosing highly rated funds from reputable houses. The problem is not the individual fund quality; it is the combination. Portfolio overlap analysis is the one check that reveals whether your rational individual choices add up to a rational portfolio. Use this calculator before every new fund addition, and review it every six months to catch drift as fund managers adjust their portfolios.

How to Interpret Your Overlap Results and What to Do Next

Getting an overlap percentage is the easy part. Knowing what it means for your specific portfolio requires context. Here is a practical interpretation framework for Indian equity fund investors.

Reading the Overlap Table: What Each Column Tells You

The "ALL" badge on a stock means every fund you selected holds it. These are your highest concentration points – the stocks where you have multiplied your effective exposure without knowing it. Pay attention to the weight column for these stocks: if HDFC Bank appears in three funds at 7%, 6%, and 5% respectively, your blended portfolio has an effective 18% concentration in a single private sector bank. That is meaningful concentration risk that no "diversified equity fund" label should mask.

The "2F" or "3F" badge means a stock appears in 2 or 3 of your selected funds but not all. These partial overlaps are less critical but worth noting, especially in sectors. If you have four funds and six of them carry banking sector stocks at 15-20% weight each, your aggregate banking exposure could exceed 60-70% of your effective equity allocation.

The "Avg Wt" column shows the average weight of a stock across the funds that hold it. This is useful for identifying outsized bets: a stock with 4% average weight across three funds represents Rs 12,000 per Rs 1 lakh invested that goes into that one company – before even accounting for the funds that don't hold it.

When High Overlap Is Actually Acceptable

Not all overlap is equal or harmful. Some specific situations where high overlap is acceptable: when two funds are in genuinely different categories (a large cap and a small cap fund may show 10-15% overlap on a few multi-cap stocks, which is fine); when the overlapping stocks are in the non-overlapping portion of a flexi cap fund's mandate (Parag Parikh Flexi Cap holds HDFC Bank because it believes in it, not because the mandate forces it); when you are building a satellite position around a core index fund and the satellite naturally holds some index constituents.

The overlap that should concern you most is large cap fund vs large cap fund, large cap fund vs flexi cap fund, or ELSS fund vs another equity fund in the same house. These are where structural overlap is highest and the case for holding both is weakest.

A Note on Data Sources and Reliability

The holdings data in this calculator is sourced from AMFI's monthly portfolio disclosures, which every Indian mutual fund is legally required to publish as mandated by SEBI. The underlying regulatory framework is SEBI's Categorization and Rationalization of Mutual Fund Schemes circular, which standardised fund categories and mandated transparent monthly portfolio disclosure. Holdings are typically disclosed within 10 days of month end, so the data you see reflects portfolios from the most recently completed month.

One important caveat: fund portfolios change month to month. An overlap result from today may be different in three months if either fund manager significantly shifts their allocation. This is especially true for actively managed flexi cap and multi cap funds that have greater mandate flexibility. For passive index funds tracking the Nifty 50, holdings change only at index rebalancing (typically semi-annually) and are highly predictable.

Frequently Asked Questions About Mutual Fund Overlap in India