These funds track a key stock market index, like the BSE (Bombay Stock Exchange) Sensex or the NSE (National Stock Exchange) S&P CNX Nifty. Hence, their portfolio mirrors the index they track, both in terms of composition and the individual stock weightages. For instance, an index fund that tracks the Sensex will invest only in the Sensex stocks. The idea is to replicate the performance of the benchmarked index to near accuracy.
Investing through index funds is a passive investment strategy, as a fund’s performance will invariably mimic the index concerned, barring a minor “tracking error”. Usually, there’s a difference between the total returns given by a stock index and those given by index funds benchmarked to it. Termed as tracking error, it arises because the index fund charges management fees, marketing expenses and transaction costs (impact cost and brokerage) to its unitholders. So, if the Sensex appreciates 10 per cent during a particular period while an index fund mirroring the Sensex rises 9 per cent, the fund is said to have a tracking error of 1 per cent.
To illustrate with an example, assume you invested Rs 1,000 in an index fund based on the Sensex on 1 April 1978, when the index was launched (base: 100). In August, when the Sensex was at 3.457, your investment would be worth Rs 34,570, which works out to an annualised return of 17.2 per cent. A tracking error of 1 per cent would bring down your annualised return to 16.2 per cent. Obviously, the lower the tracking error, the better the index fund.
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