maybe they know something... I agree though, usually large orders would be done off market or distributed over several days to reduce market impact cost. The only reason I could think of for someone going in heavily like this is that they have information that must be acted on fast. Perhaps news coming next week?
ESS Price at posting:
57.3¢ Sentiment: None Disclosure: Held
A personalised tool to help users track selected stocks. Delivering real-time notifications on price updates, announcements, and performance stats on each to help make informed investment decisions.