Day traders took their profit and I believe there was also a short raid around close time - this will always happen and has nothing to do with the company itself. We had also a gap that needed to close.
There are day traders, swing traders, long time holders and everyone has his own vision of trading - just pick whatever works for you and focus on your strategy only.
I think that this fluctuation will keep happening till earning date and will provide opportunity for day trading (not my style, but nothing wrong with it if you know what you are doing).
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