Don't worry at all. If you look at Nasdaq it will show you the After hour sales. Their was 45000 shares sold after hours, but the After Hour price is shown as the last price in After hours. Someone sold 25 shares at 148.77, most of the After hours Celg was up. But someone who probably sold 25 shares to himself sold it at that low price, to make it look like it was falling. So out of 45000 shares only 5 were sold at that price. 44995 were sold above the closing price. Watch tomorrow at premarket it will open way above the closing price. CELG is way oversold and undervalued, to many drugs in the pipeline. Should be up 3-5 tomorrow and another 3-5 Friday. Would not be surprised if it hits 157 - 160 by end of day Friday. Again DO NOT SELL as it was above closing price most of after hours. I should charge you for this, but its for free ;) CELG is going up big time!