If you take a look at the symbol 'cors', use a normal candlestick chart, you'll notice an up bar/uptick volume increase at the close, which sent the stock price up. After hours, there was a tiny down bar volume decrease, and the price dropped 10%, without any heavy volume.
The question is what happened? I thought in order for a price to drop, people have to sell, and there will be a noticeable increase of 'negative' volume...
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