Your fund grew. Did it change?

Summary: The fund has the same name, the same manager, the same category. It now holds 130 stocks. The largest position is 2 per cent. The investor who bought in early is still holding—but the question worth asking is whether they're still holding the same fund.

Summary: The fund has the same name, the same manager, the same category. It now holds 130 stocks. The largest position is 2 per cent. The investor who bought in early is still holding—but the question worth asking is whether they're still holding the same fund. A young manager arrives at a fund house with a clear idea of what he wants to do. The fund he has been allocated has a few hundred crores under management. He picks 20 stocks he believes in deeply, sizes them aggressively, and lets the conviction run. The fund does well. Returns get noticed. Money begins to arrive. The fund crosses Rs 1,000 crore, then Rs 10,000 crore, then Rs 50,000 crore. The investor who bought in early opens the latest factsheet and finds something curious: the fund now holds 130 stocks. Many of the names the manager once held with conviction are still there, but they sit alongside roughly 100 others the investor knows very little of. The largest position is no longer 8 per cent of the portfolio. It is 2 per cent. The fund has the same name, the same manager, the same SEBI category. But it is no longer the same fund. This is happening, in some form, to most large active equity funds in India today. The country’s largest active equity fund has crossed Rs 1.25 lakh crore. The largest small-cap fund now manages over Rs 60,000 crore. These numbers were unthinkable in the past. But in the past eight years, a seismic shift has happened. The largest fund by size or assets under management has grown several times in every category. The leader of the diversified universe has accelerated away from the rest into a class of its own. See chart: The age of giant funds.  This kind of growth has been encouraging for AMCs but unsettling for the investor who bought in when a fund was small and aggressive and is now wondering whether they should continue to hold it. The worry is rational. A fund that once placed concentrated bets in a Rs 8,000-crore vehicle cannot, by the simple physics of size, do the same thing in a fund eight times larger. And hence a simple question arises: does AUM size matter? Or in simple words, does a fund that has grown too big deliver less? How we tested the giants To answer that, this story tests the five largest funds by size in each of the large, mid, small and diversified category buckets on three critical dimensions. For context, the diversified bucket consisted of flexi-cap, large-and-mid-cap, multi-cap, value-oriented and ELSS funds as these categories largely invest in the same universe of stocks. The three dimensions were: First, composition: has the portfolio changed as the fund grew? Second, mobility: can the fund still buy and sell its holdings easily, or has size made it harder to move? Third, outcome: has any of this actually cost investors returns? Together, these three tests show where to look for the real impact of size: first inside the portfolio, then in the fund’s ability to move, and finally in the returns investors receive. Composition: How portfolios evolved with size Three parameters answer that. 1. Number of securities. The first measure is the number of securities a fund holds. Stock count is one of the simplest signals of how a manager thinks about the portfolio: a tight, high-conviction book or a broad, diversified one. The chart ‘Casting wider nets’ maps this out for each bucket. The result is selective and for a reason. Where the fund manager has a broad investable universe, the stock count has stayed disciplined. Where that universe is narrow, like in small caps, the count has had to grow because there is nowhere else for the rising AUM to go. 2. Top 10 concentration. The more interesting question is whether these new positions came at the cost of the original conviction. Did fund

This article was originally published on May 20, 2026.