Mean-Reversion Trading of the WTI–Brent Crude Oil Spread

Summary

The document describes a futures spread strategy based on the price difference between WTI and Brent crude oil. It explains that the oils differ in composition and production and transport characteristics, while temporary shocks may cause their price spread to move away from a longer-term equilibrium. The proposed approach treats those deviations as opportunities for mean-reversion trades.

As a simple example, it calculates a 20-day moving average of the spread. A spread above that average triggers a short position, closed when the spread crosses back below the average; a spread below it triggers a long position, closed when it crosses above. The cited source paper reports that an ARMA model was its best WTI–Brent approach and gives in-sample and out-of-sample results, including annualized out-of-sample returns of 34.94% after transaction costs. The document cautions that the paper’s short history may make its parameters vulnerable to data-mining bias. It also says the strategy’s relationship to equity risk is unknown, so its usefulness as a crisis hedge requires rigorous testing.

Key ideas

• The WTI–Brent price spread may revert toward a longer-term economic equilibrium after temporary shocks.
• A 20-day moving average can serve as a simple estimate of fair spread value.
• The example enters against deviations from the average and exits when the spread crosses back through it.
• The source paper reports profitable ARMA results in and out of sample, but the document flags the limited history and possible data-mining bias.
• The strategy’s value as an equity hedge is unknown and requires further testing.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.