I can't imagine what if any bad news could be coming at this point, so it looks like some one saw bid weakness, and pounced on it, shorting it and starting a sell off. Perhaps MM's needed to harvest cheap shares while they have a chance. I have some other boitech longs that got hammered this morning too. My be an MM sector pounce. No way to know if it will be a one day buying op, or if it will continue.
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