This is a 6.4% turnaround (from �4.85 to �5.16) in a few hours on HUGE volume.
The volume picked up in the afternoon with a few decent size trades taking place in the last hour or so (325k, 155k, 150k, 133k). The last trade of the day for �5.16 was for 82k shares. The trades were mostly �over the counter� (between houses).
I think that this is a great sign that something positive is going on. News coming maybe?