I think they were the buyers who bought the shares at $1.65 ~ $2.32 during the past few sessions! They sold those shares at $2.33 ~ $3.01 to make easy quick gains...
Wow, the price crashed to $2.2 from yesterday's high $3.01! What happened here after that ridiculous high $3.75 Per Share Buy-Out Offering which is 50% higher than the current $2.5 Per Share BO Deal?