a2 firstname.lastname@example.org, Fogelman College of Business and Economics, University of Memphis, Memphis, TN 38152
a3 email@example.com, Faculty of Commerce and Accountancy, Chulalongkorn University, Bangkok, Thailand
We study after-hours trading (AHT), price contributions, and price discovery following quarterly earnings announcements released outside of the normal trading hours. For Standard & Poor’s (S&P) 500 index stocks from 2004–2008, AHT is heightened on announcement days. A significant portion of the price change and price discovery occurs immediately after the earnings releases. Prices in AHT show a large degree of informational efficiency, further demonstrating the importance of price discovery in AHT. We also provide evidence suggesting that firms prefer after-hours earnings announcements, as trades are mainly from informed traders, and those trades are relied upon to convey information to the general public.