Last Wednesday at 4:15 PM Bristol-Myers issued a Press Release announcing that earnings for the quarter and the year would be much lower than previously estimated. The stock instantly plunged as you can see from the chart.

Investors who don't have access to the after-hours market saw the stock close at $37.70 on Wednesday afternoon and open about 20% lower on Thursday morning at $29.90.

If I were still day trading stocks I'd focus a lot of attention on pre-open and after-hours activity... there's some great directional movement at those times and if the stock is very liquid (like BMY) the risk of playing is tolerable.

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Chairman MaoXian