The Problem That's Invisible Until You Look
Mutual fund overlap is one of those things nobody tells you about when you're starting to invest. You add a new fund because it's got a good Morningstar rating or a friend mentioned it. Then another one. Then a third. On paper, you have a diversified portfolio. In reality, you have HDFC Bank, Reliance Industries, and Infosys — three times each, in three different funds.
This is overlap. Two or more funds holding the same underlying stocks. It's not dangerous in the way that concentrated bets are dangerous, but it is quietly expensive. You're paying multiple expense ratios for a single effective exposure.
Why This Happens So Often
Large-cap funds are the problem. Almost every large-cap fund in India has Nifty 50 stocks in its top 10 — because those are the most liquid, most researched, and most index-owned stocks on the exchange. A fund manager at Mirae and a fund manager at Axis are both looking at the same HDFC Bank research, the same RBI policy signals. Their top holdings end up very similar.
Mirae Asset Large Cap and Axis Bluechip have roughly 70% of their portfolios in common stocks. HDFC Top 100 and ICICI Pru Bluechip are about 75% the same. Any two Nifty 50 index funds from different AMCs are literally 100% identical — they track the same index.
What To Do About It
The fix is conceptually simple: own one fund per category, not multiple.
One large-cap fund (or better, one Nifty 50 index fund). One mid-cap fund. One debt fund. If you want international exposure, one global fund. Four funds total. Every additional fund in the same category is probably overlap, not diversification.
When consolidating, choose the lower expense ratio fund in each category, all else being equal. The active fund trying to beat the Nifty 50 usually doesn't — and costs you 10x more to try.
Checking Your Portfolio's Overlap
The manual way is slow: download each fund's factsheet, compare holdings, add up the percentages. Upload your portfolio to WealthLenseAI and the AI does this instantly — showing exactly which funds are duplicating each other and which to exit.