What the Nifty 50 Actually Is (and What It Isn't)

When a news anchor says “the market rose 1% today”, they almost always mean one of two numbers: the Nifty 50 or the Sensex. Neither is the market itself. Each is a carefully built basket that stands in for it.

A basket, weighted by size

The Nifty 50 holds 50 of the largest, most traded companies on the National Stock Exchange, across more than a dozen sectors. The Sensex does something similar with 30 companies on the BSE.

Companies aren't equal inside the index. Each is weighted by its free-float market capitalisation: the market value of the shares actually available to the public, not those held by promoters. A very large company can make up 10% or more of the index; a smaller one under 1%.

That's why a big move in two or three heavyweight stocks can move the whole index, even if most companies went the other way.

What an index is good for

An index is a benchmark. It tells you what a simple, diversified investment in large Indian companies returned, so you can judge whether your fund, or your own stock picks, did better after costs.

It's also something you can buy. An index fund or ETF tracking the Nifty 50 owns the same companies in the same proportions, usually for a fraction of a percent a year.

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What an index isn't

It isn't the economy. Listed companies are a slice of India's economy, weighted towards finance, IT, energy and consumer brands. Farming, small businesses and much of the informal economy don't appear at all.

It isn't your portfolio either. If you own mid-caps, debt funds and gold, the Nifty's daily move tells you little about your own day.

Price index or total return

The Nifty 50 you see quoted is a price index: it ignores dividends. The Total Return Index (TRI) adds them back in. Over long periods the gap is meaningful, about 1 to 1.5 percentage points a year, which is why SEBI requires funds to compare themselves with TRI versions.

Source: NSE Indices — Nifty 50 Methodology