X0303 4 2011-05-26 0000874663 ALKERMES INC ALKS 0001235598 FRATES JAMES M 852 WINTER ST. WALTHAM MA 02451 1 SVP, CFO & Treasurer Common Stock 2011-05-26 4 M 0 2125 0 A 88976 D Common Stock 2011-05-26 4 F 0 675 17.98 D 88301 D Common Stock 4000 I By Sons Restricted Stock Award 0 2011-05-26 4 M 0 2125 0 D 2010-05-26 Common Stock 2125 4250 D Restricted stock unit award granted under the Alkermes, Inc. 2008 Stock Option and Incentive Plan. Shares subject to the award vest in equal installments over a four year period, commencing on the one year anniversary of the date of grant and annually thereafter. /s/ Jennifer Baptiste, attorney-in-fact for James M. Frates 2011-05-31