Intraday momentum and return predictability: Evidence from the crude oil market

Intraday return predictability has firstly been identified in the equity markets, and we extend the analysis to the crude oil market by using high-frequency United States Oil Fund data from 2006 to 2018. We find a different intraday prediction pattern in the oil market, where only the first half-hour returns positively predict the last half-hour returns. A market timing strategy based on these findings generates substantial profits. We further decompose the first half-hour return into its overnight and open half-hour components and find that the former contains more predictive information. The economic mechanisms of infrequent portfolio rebalancing and the presence of late-informed investors explain our findings. Notably, unlike equity markets, the oil market exhibits a unique intraday trading volume pattern due to the release of two routine oil inventory announcements. However, the information contained in the inventory announcements does not offer predictability for the last half-hour returns.