Alexion Pharmaceuticals to Report First Quarter 2013 Results on Thursday, April 25, 2013

Alexion Pharmaceuticals, Inc. (Nasdaq: ALXN) today announced that the Company will report its financial results for the first quarter ended March 31, 2013 on Thursday, April 25, 2013 before the US financial markets open. Following the release of the financial results, Alexion management will conduct a conference call and audio web cast on Thursday, April 25, 2013, at 10:00 a.m. Eastern Time (ET).

To participate in this conference call, dial 888-312-3051 (USA) or 719-325-2168 (International), passcode 7274940 shortly before 10:00 a.m. ET. A replay of the call will be available from 1:00 p.m. ET through a limited time thereafter. The replay number is 888-203-1112 (USA) or 719-457-0820 (International), passcode 7274940. The audio web cast can be accessed at: www.alexionpharma.com.

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