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Have you ever held top-rated mutual funds and still watched your returns lag when the market was clearly moving ahead? One reason behind this frustrating experience lies in a problem you may never think to check for: fund overlap. And 1 Finance’s Mutual Fund Overlap Calculator pinpoints this problem very well.
Take this example: An investor had been putting money into mutual funds for about four years. Every time he came across a news article or a recommendation about a top-performing fund, he added it to his portfolio. By the end of those four years, he held three funds from three different AMCs. Due to the funds’ strong ratings and a solid track record, he was confident his money was spread out well.
What he had not checked, not even once, was what those funds actually held. Those three highly-rated funds belonged to the same category, and held the same ten or twelve stocks, weighted almost identically. This is called a mutual fund overlap, and it reduces diversification you believe your portfolio has. Let’s find out how the Mutual Fund Overlap Calculator can resolve this.
What 1 Finance’s Mutual Fund Overlap Calculator actually measures
Mutual fund overlap refers to the common stocks shared across multiple fund schemes in your portfolio, along with their combined average weightage. The 1 Finance Mutual Fund Overlap Calculator measures how large that shared exposure is.
This matters because diversification is about what you actually own, instead of the number of funds you hold. Hence, adding two funds from completely different AMCs, can still be invested in an almost identical set of stocks. When this happens, adding another fund simply repeats the same bet, and that too at an additional cost.
The Mutual Fund Overlap Calculator addresses this in three specific ways.
- It fetches your portfolio and exposes the hidden overlaps.
- It analyses the top five stocks dominating the holdings and shows you where your money is genuinely sitting.
- It then pinpoints which specific schemes share significant overlap. This exact data guides you to decide which funds to replace or rebalance.
Check out: Identify overlapping funds in your portfolio with the Mutual Fund Portfolio Calculator
Let’s revisit that investor’s story to gain more clarity.
The investor’s portfolio: When three funds turned out to be one
We will name that investor as “Rohan”.
Rohan is a 27-year-old software engineer based in Mumbai. Four years ago, he started investing in mutual funds with a clear goal: build a substantial retirement corpus over the next 25 to 30 years. He invested ₹10,000 a month and chose his funds carefully, or so he believed.
He started with one large-cap equity fund that consistently appeared on recommended lists. One year later, he came across a different large-cap fund from another AMC that had delivered strong one-year returns and added it to his portfolio. About a year after that, a third large-cap equity fund from yet another fund house was receiving significant attention in the financial press. He added that one too. With three funds from three different AMCs, he assumed this combination amounted to meaningful diversification in his portfolio.
Also read: Why you should not invest in ‘top 5 mutual funds’
So why did his assumption fall apart? The answer lies in how large-cap funds work. SEBI mandates that every large-cap equity fund in India must invest a minimum of 80% of its total assets in the top 100 companies by market capitalisation. That universe of 100 companies is fixed and identical for every fund house in the country. When three funds are fishing from the same pond, they tend to catch the same fish. Here’s the evidence of what the overlap actually looked like across Rohan’s three funds.
Mutual fund overlap across the funds: Fund A, Fund B, and Fund C
| Fund pair | Overlap |
|---|---|
| Fund A vs Fund B | 73% |
| Fund B vs Fund C | 67% |
| Fund A vs Fund C | 62% |
Disclaimer: The scheme names have been anonymised to focus purely on the concept of overlap, rather than commenting on specific mutual funds.
When Rohan ran his portfolio through the Mutual Fund Overlap Calculator, the average overlap across all three funds came to ~75.6%. At 73% overlap between Fund A and Fund B, only 27% of Fund B is contributing something that Fund A doesn’t already hold. The remaining % is just capital allocated twice to the same positions without any additional breadth. His portfolio ran on one investment strategy in parallel three times over and paid extra for the illusion of variety. Now, let’s check the top 5 holdings.
Top 5 stocks overlap
| Stock | Weightage |
|---|---|
| HDFC Bank Ltd. | 8% |
| ICICI Bank Ltd. | 8% |
| Reliance Industries Ltd. | 5% |
| Larsen & Toubro Ltd. | 5% |
| State Bank of India | 4% |
These top-weighted large-cap stocks drive a fund’s daily performance. When the same dominant stocks appear across three different funds, the combined portfolio becomes overly reliant on just a few companies. The surface-level variety in fund selection masks the reality: your underlying exposure isn’t truly diversified.
What does the overlap percentage reveal about your portfolio
Rohan’s portfolio, which has ~75.6% overlap tells a concerning tale about his asset allocation.
Banking and financial services stocks alone accounted for nearly 30% of his total corpus, because HDFC Bank, ICICI Bank, Axis Bank, Bajaj Finance, and Kotak Mahindra Bank all appeared across every fund he held. Beyond financials and technology, he lacked sector diversification, held zero debt, and exposure to different market capitalisations.
For a 27-year-old with up to a 30-year investment horizon, his asset allocation wasn’t personalised. At that age and time horizon, an investor can absorb higher short-term volatility across a broader range of assets. With three decades left before he needs to liquidate his corpus, these temporary market dips would have made no real impact on his returns. This extended runaway gives growth-oriented assets the time to recover and compound effectively.
Adding different asset classes, like REITs or gold ETFs could have built a diversified portfolio to hedge against volatility. Instead, Rohan’s entire corpus concentrated at the most conservative end of the equity spectrum.
Ask yourself this: how different is your situation from Rohan’s?
Your portfolio should reflect your specific financial reality. Your age, your income stability, your upcoming financial obligations, your existing liabilities, and your actual risk tolerance all shape what your allocation should look like. Like him, if you are selecting top-rated large-cap funds without checking for overlap, you may end up with near-identical portfolios.
Stop owning the same stocks through multiple mutual funds.
Consult a Qualified Financial Advisor today to fix your portfolio.
But there’s a good news from SEBI. From August 2026, fund houses must publish monthly overlap reports between all their schemes. You will finally see how much two funds from the same AMC share.
SEBI also caps overlap at 50% for sectoral and thematic funds with other equity schemes from the same fund house. Large-cap funds are exempt. They are limited to the top 100 companies and need to 80% mandate, so some overlap is unavoidable. Sectoral and thematic funds have thousands of stocks to choose from but often cluster into the same names. That’s the real risk SEBI is addressing here.
What else 1 Finance’s Mutual Fund Overlap Calculator analysis does for your portfolio
1. Avoids concentration risk
When the same stock appears across multiple funds in your portfolio, a single bad quarter from that company can pull down everything you own at the same time. The same is applicable to the sectoral exposure. Rohan’s exposure to HDFC Bank, for instance, wasn’t 8% of his portfolio. It was closer to 20%, as found across three funds. A sharp correction in the sector would hit all three funds simultaneously. The Mutual Fund Overlap Calculator lets you see this structural risk and correct it before it becomes a loss you are forced to absorb.
2. Evaluates NFOs honestly before you invest
New Fund Offers (NFOs) are often marketed as fresh opportunities. And many are launched within categories an investor already holds. A new flexi-cap NFO may mirror the top ten holdings of the flexi-cap fund already in your portfolio. The overlap calculator lets you check a fund you are considering against what you already own, signaling the overlap percentage.
3. Saves you from a process that would otherwise take hours
Tracking individual stock weightages, sector concentrations, and market-cap exposures across multiple schemes manually means going through monthly fund fact sheets, cross-referencing holdings fund by fund, and doing the math yourself. For most investors, this is simply not practical. 1 Finance’s Mutual Fund Overlap Calculator runs this entire analysis for you in minutes.
How to use 1 Finance’s Mutual Fund Overlap Calculator
Open the Mutual Fund Overlap Calculator and choose one of two ways to proceed.
Option 1: Automatically fetch your portfolio using your PAN
- Enter your PAN and registered mobile number to receive an OTP.
- You will be redirected to the MF Central website for verification.
- Once verified, you will be asked a few questions about the type of data to be shared, the investment categories to include, and the AMCs you want to pull from. This generates a QR code for your CAS Request.
- Upload that QR code back to the Mutual Fund Overlap Calculator, and the tool will present your top five stocks with their respective weightages, the overlap percentage across your schemes, and the specific fund names involved. You can download this report for future reference.
Option 2: Manually add your funds
- Type in the name of your fund scheme directly and use the ‘Add Fund’ option to include additional schemes, up to five at a time.
- Once done, select ‘Find Overlap’ and the calculator will generate your overlap report immediately.
If you have never checked your portfolio for overlap, this is the most practical place to start. Perhaps most importantly, this clarity sits at the heart of financial planning. Checking mutual fund overlap encourages you to make intentional choices. Your spending habits, your urge to buy extra funds for the sake of diversification, and your tolerance for uncertainty are all connected.
1 Finance’s Mutual Fund Overlap Calculator gives you a reality check about your investments. A Qualified Financial Advisor can take that overlap data, analyse it alongside your financial goals, risk appetite, and investment horizon, and give you a personalised financial plan tailored to your future financial goals.
