Price at 4.00 was actually $4.20 - most of the drop occurred in the 2 hours previous. Price has retraced to what it was 2 months ago after one day in May when 176,000 went through between $4.60 and $4.80. Pity I wasn't sharp enough to sell down that day - this is a stock subject to occasional apparently irrational price movements that can be exploited.