Possibly it is someone who knows/suspects that the June quarter earnings will not be great.
How was the vog (newbies: vog = volcanic fog) during the June quarter?
When the stock dropped yesterday morning, I mistook it for an errant market order.
The action in the afternoon demonstrated that was incorrect.
The bounce back today and the appearance of a 20K seller at $6.50 (the old top of trading range)
demonstrates this to be (apparently) the case. Of course, all traders operate in an uncertain knowledge sphere....otherwise it is insider trading.
The stock's performance will reflect the company's operating performance in the intermediate and long run.