Alexion to Present at the 31st Annual William Blair & Company Growth Stock Conference

Alexion Pharmaceuticals, Inc. (Nasdaq:ALXN) today announced that Vikas Sinha, Chief Financial Officer of Alexion Pharmaceuticals, will present at the 31st Annual William Blair & Company Growth Stock Conference in Chicago at 10:50 a.m. Central (11:50 a.m. Eastern) on Tuesday, June 14, 2011.

An audio webcast of Mr. Sinha’s remarks will be available live. You can access the webcast at: www.alexionpharma.com. An archived version of the remarks will also be available through the Company’s web site for a limited time following the conference.

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