Looking at yesterdays Time and Sales stats while they're still up (click the Time and Sales link here to see them -- but they will change over time as they show the most recent trades) I note that there are trades of 20,000, 10,000, 12,000, and other large lots, on a day that was low volume until the last half hour (when it changed from being an extremely low volume day with about 115,000 shares trades, to having another 60k shares or so traded).

Someone covering, or accumulating?