“…Our results do not state tbat private information does not play a role in 19. See Singh and Zak (1992) intraday pattems in other securities markets but, rather, that private information is not a necessary condition for the observed intraday pattem. Admati and Pfleiderer (1988) suggest that private infomiation creates trading clusters, and Hong and Wang (2000) suggest that U-ading will cluster at the open and close in markets with private infomiation and ovemight trading stops.…”