Kos Takes Two Shots In The Arm

Kos Pharmaceuticals (KOSP) had been a sleeper, languishing last year between 4 and 5. But it shot up in the first five trading days of the year, to 8 on Jan. 3 from 5. It jumped to 12 3/8 on Jan. 24, before easing to 10 1/2 on Feb. 1. What's behind the leap?

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