Press Releases
June 5, 2012

Alexion to Present at William Blair & Company 32nd Annual Growth Stock Conference

CHESHIRE, Conn.--(BUSINESS WIRE)-- Alexion Pharmaceuticals, Inc. (Nasdaq: ALXN) today announced that Vikas Sinha, Chief Financial Officer of Alexion Pharmaceuticals, will present at the William Blair & Company 32nd Annual Growth Stock Conference in Chicago at 8:50 a.m. Central time (9:50 a.m. Eastern time) on Tuesday, June 12, 2012.

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 An archived version of the remarks will also be available through the Company's web site for a limited time following the conference.

[ALXN-G]

Alexion Pharmaceuticals, Inc.
Irving Adler
Sr. Director, Corporate Communications
203-271-8210
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Alexion Pharmaceuticals, Inc.
Kim Diamond (Media)
Director, Corporate Communications
203-439-9600
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Rhonda Chiger (Investors)
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Source: Alexion Pharmaceuticals, Inc.

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