Notable Put Options Activity in Alexion Pharmaceuticals

Shares of Alexion Pharmaceuticals

are higher on the session by 0.16%, currently trading at $57.11. The stock has been moving largely higher over the past three months and is currently trading above the 50-day moving average. Options traders are focusing on puts today. A short while ago the September 2011 $55.00 put traded 660 times on open interest of 91 contracts. Put volume is dominating call volume 5 to 1. Alexion Pharmaceuticals, Inc. is a biopharmaceutical company engaged in the discovery, development and commercialization of therapeutic products aimed at treating patients with severe and life-threatening disease states, including those in the therapeutic areas of hematology, nephrology (including transplant rejection), neurology, ophthalmology and cancer.