Multi-market trading and overnight price discovery: Evidence from American Depository Receipts

This article compares the overnight price discovery of American Depository Receipts (ADRs) and common stocks traded in the US stock market. It examines how trading activities of ADRs’ underlying shares in home markets affect price discovery. We find that the efficiency of the opening price and the price discovery during the close-to-open period is significantly higher than that of US common stocks. Further analyses show that the price discovery of ADRs shifts from the trading day to the overnight, and the opening prices of ADRs are more efficient if there are more trading activities of underlying shares in home markets. The results suggest that trading similar assets in multiple markets over non-overlapping hours improves price efficiency. JEL Classification: G12, G14, G15