Is it time to see what your index fund is hiding from you?

Picture this. You did everything right. You set up an SIP in a Nifty 50 index fund, stopped checking stock tips on WhatsApp, and told yourself: "I am a long-term investor." Three years have passed. You open your portfolio—and while it has not lost money, the returns are not really impressive. Meanwhile, your neighbour who bought certain defence or power stocks is talking about returns of 50%, 70%, or even higher in a single year.

What went wrong? Nothing, technically. And that is exactly the problem.

Index investing is a genuinely good idea—especially for those starting out. It beats roughly 70-80% of actively managed funds over the long run. But somewhere along the way, a myth crept in: that index investing always works. That patience will always be rewarded within a reasonable window. But the last three years in Indian markets have delivered a useful—but uncomfortable—lesson.

What are the numbers saying?

Here is what the Nifty 50 and broader market indices have actually delivered over the past three calendar years, and in 2026 so far:

Sources: NSE India, Business Standard, BW Businessworld, Reuters. 2026 YTD calculated as on May 22, 2026.

From the above table, the picture that emerges is not of a consistent, reliable wealth-building machine. The divergence between the index and individual stocks has been striking. In 2024, while the Nifty 50 delivered a modest 8.8%, at least 30 stocks from the Nifty Midcap 150 and Smallcap 250 doubled in value — and over 100 stocks from those 400 were up more than 50% in a single calendar year.

Even in 2025, the divergence continued. Within the Nifty 500, Force Motors gained 191%, L&T Finance Holdings was up 121%, and Hindustan Copper advanced nearly 97%. The gap between what the index gave and what careful stock selection could have given you was enormous, even in a year when the index nominally "did well."

The index can give you 10% while a handful of the right stocks give you 50%. Both can be true in the same year. That gap is what active investing is designed to capture — and what index investing, by definition, cannot.

The concentration problem

When you buy a Nifty 50 fund, you are told you are getting a "diversified" portfolio. Here is what that actually looks like:

Nifty 50 — Sector weightage (select sectors)

Source: NSE

Nearly four rupees in every ten you invest in a Nifty 50 fund goes to banks and insurance companies. Another rupee goes to oil and gas. Basically, almost 50% returns are in just two sectors. That means when financials are sluggish, as they have been in 2026, the entire index is weighed down, no matter how well defence stocks, power companies, or pharma names are doing.

The IT sector tells an even starker story. Its weight declined meaningfully from low teens to under 9% today, as TCS, Infosys, and their peers have underperformed sharply in the face of global tech headwinds. An investor who simply avoided IT stocks could have navigated this entirely. An index fund investor had no choice but to absorb the drag.

In other words: the market itself is not broken. There are plenty of opportunities out there. The index—weighed down by its heavyweights in financials and IT—just cannot see them.

Aren't there stocks that have corrected as well?

Someone reading this would argue that while there are many stocks that have outperformed the index, there are also those that have fallen more than the index. These stocks have actually delivered sharp negative returns over the aforementioned time period. True.

But, when analysing portfolio returns, how often do we look at stocks that have fallen and feel better about our performance? Human behaviour compels us to look at those who have done better than us and wish those were the stocks we had invested in.

The real risk: Investor behaviour

This brings us to the less-discussed but arguably more dangerous risk of index investing: human behaviour.

Academic finance loves to say that investors should stay invested through the long term, that markets always recover, that time in the market beats timing the market. All of this is true. What it misses is that real investors are not textbook robots. They check their phones. They have EMIs, school fees, and family obligations. And they have a very limited tolerance for watching a portfolio go nowhere, or worse, go negative.

Has this happened before?

Yes, and not just in India. The S&P 500 delivered essentially very low or near-zero real returns over long stretches (2000 to 2013). An investor who started in 2000 and gave up in 2010 locked in a significant loss. One who stayed until 2020 became very wealthy. The question is always: who actually has a fifteen-year window of patience?

Closer to home, the Nifty 50 has gone through multiple flat-to-sideways phases. The 2011–2013 period. The 2018–2020 stretch.

Every time this has happened, individual stocks and sectors have continued to generate strong returns. The problem is that index investors by design cannot tilt toward what is working. They must take the whole package, underperforming IT, sluggish financials, and all.

So, what should you do?

To be very clear: if you are new to investing and have not yet started, a Nifty 50 index fund remains one of the best first steps you can take. It is simple, inexpensive, and removes the very real danger of picking the wrong stock at the wrong time. For a complete beginner, it is still an excellent entry point.

But if you have been investing for a few years, the evidence suggests it is time to think more actively:

• Diversify beyond the Nifty 50. Consider adding midcap index funds or look at sectoral exposure in areas where you have genuine conviction.

• Think seriously about asset allocation. Gold delivered strong returns through 2024 and 2025. International equity offers diversification away from India-specific risks. Even short-duration debt funds can provide stability when equity markets are choppy. An investor who puts 100% of their savings into a Nifty 50 index fund is not being disciplined; they are being concentrated.

• Know your own temperament. If a 9% drawdown in five months would cause you to pause your SIP or redeem your units, then a pure index strategy is not actually suitable for you.

The bottom line

Index investing is not a scam. It is not broken. Over twenty-five years, the Nifty 50 has delivered a long-term CAGR of approximately 12-14%, and that record is real and remarkable. India's economy will very likely be significantly larger in 2035 than it is today, and a Nifty 50 index fund will capture much of that growth. But "the long term" is doing enormous heavy lifting in that sentence.

The Nifty 50 will likely be higher in 2030 than it is today. But between now and then, there will almost certainly be extended windows where it goes sideways or backwards while specific sectors, stocks, and themes move 40–60%. The question is not whether you believe in India's long-term story. Almost everyone does. The question is whether your investment strategy is smart enough, and your asset allocation broad enough, to actually participate in it.

Index investing got you in the game. For many of you, it might now be time to actually learn how to play.