July 04, 2026
4 mins read
Holding multiple mutual funds does not automatically mean a portfolio is diversified. When two or more funds invest in the same underlying stocks, it creates portfolio overlap, which concentrates risk rather than spreading it. This article covers what mutual fund portfolio overlap means, how to identify it, why it matters for diversification, and what steps can be taken to build a portfolio that is more evenly spread across companies and sectors.
When you invest in multiple mutual funds, thinking you are spreading your risk, you might actually be buying the same stocks over and over again without realising it. This is called mutual fund portfolio overlap.
It happens when two or more funds you hold invest in the same companies. On paper, your portfolio looks diversified, but underneath it is not.
Think about it this way. You invest in three different large-cap funds, thinking you have three separate investments working for you.
All three funds may hold the same top stocks across sectors. When any of those stocks decline, all three funds in the portfolio get affected at the same time.
You thought you had three different safety nets, but you actually had one. Understanding mutual fund portfolio overlap helps you see whether your money is truly spread out or just sitting in the same stocks wearing different labels.
Mutual fund portfolio overlap occurs when two or more funds in your portfolio hold the exact same stocks.
For example, two large-cap funds will most likely hold the same set of leading blue-chip companies. Even though you own units in two separate funds, your underlying stock exposure remains largely identical.
This overlap is measured as a percentage. If two funds each hold 50 stocks and 20 of those stocks are identical, the overlap between them is 40 percent. The higher this number, the less actual diversification you have across your investment portfolio.
The problem with high overlap is that when one stock or sector goes through a bad phase, it simultaneously drags down all the funds that hold it. Instead of one fund taking a temporary hit while others stay stable, all your funds decline at the same time. This defeats the whole purpose of investing in multiple mutual funds in the first place.
Many investors assume that holding more funds automatically means better diversification. That is not always true, and here is why tracking portfolio overlap matters:
When multiple funds hold the same stocks, a fall in those stocks hits your entire portfolio at once. Your risk is heavily concentrated even though it looks well-spread on the surface
True diversification means spreading your money across different companies, industries, and market caps. High overlap means you are not getting that actual spread, no matter how many funds you own
Paying the expense ratio on two funds that hold the same stocks means you are paying twice for what is essentially a single investment. That extra cost reduces your net returns over time
Knowing where your overlap sits helps you make smarter decisions about which funds to keep, which to exit, and what actual gaps in your portfolio need to be filled
A portfolio with low overlap between funds gives you a better chance of having some funds perform well even when other sectors are struggling
Overlap does not happen by accident. There are some very common reasons why it creeps into most investor portfolios over time:
Investing in two or more funds from the same category is the most common cause. Two large-cap funds or two flexi-cap funds will almost always hold many of the same top stocks
When a particular fund category does exceptionally well, investors often pile into multiple funds from that same category to chase returns, leading to heavy unintentional overlap
Holding multiple funds from the same Asset Management Company (AMC) can cause duplication. Different funds from the same fund house often follow similar investment philosophies and research ideas
Over time, as you keep adding new funds without checking what is already inside your existing ones, the stock overlap quietly builds up
Index funds tracking the same index are the most extreme example. Two Nifty 50 index funds are essentially identical, and holding both gives you zero additional diversification benefits
Measuring portfolio overlap is a straightforward process if you know where to look:
Start by pulling up the latest portfolio disclosure of each fund you hold. Most fund houses publish this detailed list on their website every month. Look closely at the top 10 to 20 holdings of each fund and note which company names appear in more than one fund.
Beyond individual stocks, you should also check the sector allocation. Two funds might not share the exact same stock names, but if both have 30 percent in banking and 25 percent in technology, their overall reaction to market movements will be very similar.
To make this process easier, there are several free online portfolio overlap tools available. You simply enter the names of your mutual funds, and these platforms calculate the exact duplication percentage instantly, saving you from manual calculations.
Not necessarily. Some level of overlap between mutual funds is completely normal and acceptable. If you hold two funds that have a 20 to 25 percent overlap, that is generally fine. The funds are still different enough from each other to give you meaningful diversification across your portfolio.
Overlap becomes a real concern when it crosses 50 to 60 percent between two funds. At that point, you are essentially paying management fees for two funds but getting the asset allocation of one. The extra fund adds structural costs without adding any real diversification benefit.
Context also matters. If you are deliberately holding two funds from the same category as a conscious "core and satellite" strategy, that is an intentional investment choice. The real problem arises when investors accumulate high overlap unconsciously because they never reviewed the underlying holdings.
While measuring overlap is highly useful, it comes with a few practical limitations that are worth keeping in mind:
Mutual fund portfolios change every month. A fund that had a 40 percent overlap with another fund last quarter may now have a very different set of stocks. Overlap analysis is a snapshot in time, not a permanent picture
Looking only at individual stock names can miss broader concentration risk. Two funds with low stock overlap may still behave identically if they are both heavily exposed to the exact same sectors
A high overlap number does not automatically mean a fund is bad. It depends entirely on what those overlapping stocks are and how they fit into your long-term goals
Overlap is just one tool among many for evaluating your investments. It should be used alongside other key factors like expense ratios, historical fund performance, and risk metrics
Some investors get too fixated on reducing overlap and end up selling high-performing funds just to bring the duplication percentage down, which is not always the right financial move
Once you discover how much overlap exists in your mutual fund portfolio, here is a sensible way to act on that information:
First, figure out how significant the overlap actually is. A 25 percent overlap between two funds requires no immediate action, whereas a 65 percent overlap means you need to re-evaluate
Look at the investment style of each overlapping fund. If two funds hold the same stocks but one is a value fund and the other is a momentum-driven growth fund, they may still serve different roles during market cycles
If the overlap is exceptionally high and both funds are performing the exact same job, consider consolidating your investments into a single fund instead of paying dual fees
When adding any new fund to your portfolio in the future, always check its top holdings against your existing investments before committing your capital
Here are two simple examples that show how portfolio overlap works in daily investing:
Example 1: Two Large Cap Funds
Suppose you hold Fund A and Fund B, which are both large-cap funds. Fund A holds Company A, B, C, D, E, F, G, H, I, and J in its top ten list. Fund B holds Company A, B, C, D, E, K, L, M, F, and N in its top ten. Since seven out of ten stocks are common between them, the overlap is 70%. You are essentially holding a single large-cap portfolio split across two funds and paying two separate expense ratios for it.
Example 2: A Large Cap Fund and a Flexi Cap Fund
Suppose Fund C is a strict large-cap fund and Fund D is a flexi-cap fund. Fund C focuses entirely on India's top 100 companies, while Fund D splits its money across large, mid, and small-cap stocks. Their top holdings may share four or five large-cap names, but Fund D also holds mid-cap and small-cap stocks that Fund C cannot touch. The overlap here might be around 30 to 35%, which is completely acceptable since Fund D adds genuine structural diversification.
Keeping your mutual fund portfolio overlap in check gives you clear operational advantages:
When your funds hold genuinely different stocks, a market downturn in one specific sector does not drag down your entire investment portfolio at the same time
You gain true exposure to a wider range of business models, sectors, and market caps, which is exactly what diversification is supposed to deliver
You stop paying management fees on funds that are simply duplicating work another fund is already doing. Those saved expenses compound into wealth over the long term
A lean portfolio with low overlap is much easier to track, review, and manage because every single fund plays a distinct role
If an audit reveals high overlap across your current mutual funds, here is how you can systematically reduce it:
Before buying a new fund, check its top 20 holdings against your current portfolio. If more than half the stocks match, reconsider the purchase
Spread your investments across distinct, complementary fund categories. Combining a large-cap fund, a mid-cap fund, and a debt fund naturally results in very low overlap
If you hold multiple funds from the same AMC, check their investment strategies. Switching one of them to a different fund house with a different management style can quickly lower duplication
Consolidating two highly overlapping funds into one does not reduce your total investment size; it simply slashes your fees and simplifies your personal accounting
If you are unsure about which funds to prune or merge, consulting a registered financial advisor can help you make decisions based on your complete asset allocation plan rather than just the overlap percentage alone
Investments are subject to market risks. Please read all scheme-related documents carefully before investing.
Share this article: 
It is when two or more funds in your portfolio hold the same stocks. High overlap means you are not as diversified as you think even though you own multiple funds.
Yes. A 20 to 25 percent overlap between funds is perfectly normal. It becomes a problem only when the overlap is so high that two funds are essentially doing the same job.
Anything above 50 to 60 percent between two funds is generally considered too high. At that level you are paying twice for what is basically one portfolio.
Not necessarily. First check if both funds still serve different purposes. Only consolidate if the overlap is very high and neither fund offers anything meaningfully different from the other.
Once every six months is enough for most investors. Fund portfolios change monthly so checking too frequently may lead to unnecessary decisions based on temporary changes.
Large cap funds tend to have the highest overlap with each other since they all invest in the same top 100 companies. Index funds tracking the same index have almost 100 percent overlap.
Diversify across different fund categories like large cap, mid cap, and debt. Use overlap checking tools before adding new funds and consider consolidating two highly similar funds into one.
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