One of the most common conversations I have with investors goes like this: they show me a portfolio with 12 or 15 funds. They tell me they're well-diversified. Then I ask them to name the top 5 holdings across any 3 of those funds — and we find the same companies appearing in almost every single one.
Reliance Industries. HDFC Bank. ICICI Bank. Infosys. TCS.
The funds have different names, different NAVs, different AMCs, different star ratings on aggregator platforms. But underneath, they're holding large chunks of the same companies — which means the investor isn't actually diversified. They're concentrated, but in a way that's been made invisible by the number of fund names on the list.
This is mutual fund overlap. And it's far more common than most investors realise.
What Overlap Actually Means
Overlap happens when two or more funds in your portfolio hold significant portions of the same underlying stocks. The funds themselves may look different on the surface — different names, different categories, different fund managers. But if 60% of Fund A's holdings also appear in Fund B's holdings, owning both doesn't give you twice the diversification. It gives you the illusion of it.
Why It Happens — And Why Nobody Notices
Overlap accumulates gradually. Nobody sits down and builds an overlapping portfolio on purpose. It builds itself over years, one recommendation at a time.
You start with a large-cap fund from one AMC. A year later, a colleague mentions another fund with better recent returns — it's a large-cap fund from a different AMC, but you don't compare their holdings before adding it. Two years after that, you start an SIP in a bluechip fund recommended by your bank. Also large-cap. Also holding much of the same top 30 stocks.
Now you have three "different" funds doing essentially the same job, each with its own expense ratio, each generating separate tax events, each showing up separately in your portfolio app as if it's contributing something distinct.
The reason nobody notices is that portfolio apps and platforms don't show you this. They show you individual fund performance, not comparative holdings. The overlap is invisible unless you go looking for it specifically.
The Categories Most Prone to Overlap
Not all fund categories overlap equally. Some are structurally much more likely to duplicate each other:
- Large-cap funds are the most overlapping category in Indian mutual funds. SEBI regulations require large-cap funds to invest at least 80% in the top 100 companies by market cap — which means every large-cap fund is fishing from the same small pond. Two large-cap funds from different AMCs will almost certainly hold many of the same stocks
- Flexi-cap and multi-cap funds often tilt heavily toward large-caps in their actual allocation, creating hidden overlap with your dedicated large-cap funds even though they're technically different categories
- Sectoral and thematic funds overlap with each other within sectors, and often overlap with broader equity funds in their top holdings as well
- Index funds tracking the same index — owning both a Nifty 50 index fund and a Sensex index fund is pure duplication, since both track large-cap Indian equities with significant stock overlap
How to Spot It In Your Own Portfolio
You don't need a tool for this. What you need is 30 minutes and the willingness to actually look.
Pull the monthly factsheet for each fund you own — every AMC publishes these on their website. Each factsheet lists the fund's top 10 holdings. Create a simple table with your funds as columns and the holdings as rows. Any stock name that appears across multiple columns is an overlap point.
If the same 5 company names appear in the top 10 of three different funds, those three funds are not giving you three times the diversification. They're giving you concentrated exposure to those 5 companies, with extra complexity layered on top.
What Overlap Actually Costs You
The cost of overlap isn't just philosophical. It shows up in real, measurable ways:
- You pay multiple expense ratios for what is functionally one position — if two funds overlap 70%, you're paying two sets of management fees for one set of underlying returns
- Your portfolio's actual risk is different from what you believe — a correction in large-cap Indian equities will hit overlapping funds almost simultaneously, making your "diversified" portfolio feel very concentrated when it matters most
- Rebalancing becomes complex and opaque — you can't easily see what adjusting one fund means for your overall exposure when 4 funds are all holding similar positions
- Tax efficiency suffers — multiple funds generating similar returns means multiple separate tax events instead of a cleaner, consolidated position
What To Do When You Find Overlap
The answer isn't always to sell immediately. Before acting, check exit loads and tax implications — especially short-term capital gains if you've held a fund for less than a year. Impulsive selling can create a tax cost that outweighs the structural benefit of consolidating.
A more measured approach: identify which funds are genuinely duplicating each other, decide which one to keep (usually the better performer, the lower expense ratio, or the one that fits your overall structure better), and plan an exit from the redundant ones at a tax-efficient time.
The goal isn't zero overlap — some is unavoidable in any diversified Indian equity portfolio, since the same large companies dominate multiple indices and categories. The goal is intentional overlap versus accidental overlap. Knowing what you own and why, rather than discovering that your 15 funds were doing the job of 6.