The Strategy of using Long- Short Futures
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The Long- Short strategy involves taking simultaneous long and short positions on two related stocks. When we say related stocks, it means that both the stocks belong to the same sector and there is an evident correlation in the price movement of the two stocks observed over a period of time. An adequate period of time would be a year or more while determining the correlation. The stock prices of two companies might reflect a correlation for a reason. For instance the share prices of two companies belonging to the same industry might trade in the proportion of their book values, which is quite likely in case of ‘value’ stocks. There are other relevant reasons for share prices of two companies to have a correlation.
Let’s take an example for a clearer understanding of the concept. Our research team recently (1st July’08) gave a long- short strategy based recommendation to investors involving Bank of India and Axis Bank. The details of the strategy are mentioned in table below
|
|
Long |
Short |
|
Stock |
Bank of India |
Axis Bank |
|
Close |
192 |
590 |
|
Lot size |
950 |
225 |
|
Lots |
3 |
4 |
|
Futures exposure |
547200 |
531000 |
|
Total exposure |
547200 |
531000 |
|
Current price ratio |
3.07 |
|
|
|
Target 1 |
Target 2 |
|
Target price ratio |
2.90 |
2.70 |
|
Target profit Rs |
30,792 |
64,440 |
The above strategy entails going long on Bank of India futures (3 lots) and going short on Axis Bank futures (4 lots). It leads to an almost equivalent exposure on long and short futures positions, which is Rs 547200 and Rs 531000 respectively.
Figure 2 above reflects the ratio between the share prices of Bank of India and Axis bank over a one year period. It can be observed that the ratio has been in the range of 2.5 and 3. There has been a retracement every time the ratio breached the mark of 3 times on the upward side.
In the above example, the ratio of prices of the two stocks as indicated in figure 1 has moved to 3.07. This means that if one is to follow the past trend, the ratio is likely to once again come down below the 3 times mark assuming that there hasn’t been any material change in the fundamentals of both the companies. If this is to happen, then the spread between the share prices of the two stocks would reduce implying that the price of Axis Bank would fall and that of Bank of India would rise. The target ratio is 2.90. When the spread reduces to an extent that the price ratio becomes 2.90, then the investor would earn a sum of more than Rs 30,000 from the strategy.
The above strategy was actually recommended on 1st July’08. On tracking the prices as on 15th July’08, the strategy has reaped handsome returns for investors with the ratio between the prices of the two stocks well below 2.7 times, in the process even meeting profit target 2 mentioned in the strategy. Axis Bank and Bank of India closed at Rs 598 and Rs 231 on the NSE as on 15th July’08.
Risk involved
It is assumed that the historical relationship will hold good in future. However, any significant fundamental changes could lead to adverse results.
The strategy should preferably be initiated at extreme levels of the spread. In spite of this, if there is any further increase in spread in the short term, it may result in marked to market losses.





