David Hallal, CEO at ALEXION PHARMACEUTICALS INC (ALXN), sold 3,492 shares at $138.02 ($482K) on 2016-02-08, disclosed to the SEC on 2016-02-08.
Seasonal sale ($482k) by CEO — this insider has traded ALXN in February in at least three consecutive prior years. Pattern-driven, low signal.
Negative factors outweigh the positive ones.
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