Pairs trading is a strategy that involves taking a long position in one stock and a short position in another highly correlated asset to profit from the relative price movement between the two.
Understanding pairs trading
This approach relies on identifying two historically correlated financial instruments. When the price correlation breaks temporarily, a trader shorts the outperforming asset and buys the underperforming asset. The expectation is that the prices will revert to their historical mean. This allows the trader to close the positions for a net profit.
Because pairs trading involves holding both a long and a short position simultaneously, it is a market-neutral strategy. It is designed to hedge against broader market movements. If an entire sector declines, the loss on the long position is offset by the gain on the short position. Elephants using this strategy derive profit strictly from the convergence of the two specific assets rather than the overall direction of the market.
Quantitative traders apply statistical analysis to identify these asset pairs. They calculate the historical price relationship using metrics like the correlation coefficient and cointegration. Traders set entry and exit thresholds based on standard deviations from the mean spread. This mathematical approach removes directional bias from the trading process.
Pairs trading is applicable across global exchanges. Traders apply this method to equities, fixed income products, and foreign exchange markets. It requires access to instruments that permit short selling. Short selling has varying regulatory requirements depending on the national jurisdiction and the specific financial exchange.
Example
Assume two publicly traded eco-tourism operators, African Elephant Safaris and Asian Elephant Expeditions, have historically moved together on the stock market because they share identical global tourism risk factors. The spread between their share prices is consistently 10 pence. A temporary news event causes African Elephant Safaris stock to drop while Asian Elephant Expeditions stock rises. The spread widens to 30 pence.
An Elephant investor notices this statistical divergence. The investor buys shares in African Elephant Safaris for the long position and borrows shares to sell Asian Elephant Expeditions for the short position. A week later, the market corrects the pricing anomaly. The spread returns to 10 pence. The investor closes both positions and secures a profit from the relative convergence of the two elephant tourism stocks. The overall direction of the global travel index during that week does not impact the profitability of this specific trade.