NEW YORK ( TheStreet) -- Shares of Alexion Pharmaceuticals (Nasdaq: ALXN) have taken a tremendous swing upward. The stock is trading at $122.74 as of 2:11 p.m. ET, 21% above Thursday's closing price of $101.44. Volume is at 2.6 million, 1.7 times the daily average of 1.5 million.
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