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Shares of Amgen (AMGN) moved sharply higher today, but the exact reason for the move is unknown. The stock was up over 3% at the time this content was written. Recently, Amgen and AstraZeneca announced a breakthrough therapy designation for Tezepelumab, a treatment they jointly developed for patients with severe asthma. A buy signal was triggered for the stock at the time of the breakout. Here’s a recap of what happened.