Exhibit 99.1



Alkermes Contacts:


For Investors: Rebecca Peterson, +1 781 609 6378


For Media: Jennifer Snyder, +1 781 609 6166




— Fiscal Year 2013 Revenues Grew 48% Year-Over-Year to $575.5 Million —

— Fiscal Year 2013 Non-GAAP EPS Grew to $1.31 From $0.34 in the Prior Year —

— Announces Change in Fiscal Year-End From March 31 to Dec. 31 —


DUBLIN, Ireland, May 23, 2013

— Alkermes plc (NASDAQ: ALKS) today reported financial results for its fourth quarter and fiscal year ended March 31, 2013. The company also announced that it has changed its fiscal year-end from March 31 to Dec. 31, and provided financial expectations for the nine-month period ending Dec. 31, 2013.

“This was a remarkable year characterized by robust revenue growth, focused investment and significant cash flows. Our portfolio of five key commercial products is growing and generating significant revenues that provide the financial foundation of the company. For the remainder of calendar 2013, we expect our portfolio of five key products to grow approximately 25% year-over-year,” commented James Frates, Chief Financial Officer of Alkermes. “We are committed to managing our business to create value by generating significant cash flows while fueling future growth by investing in our valuable late-stage pipeline.”


Highlights for Quarter Ended March 31, 2013


·                  Total revenues for the quarter were $163.4 million and included $30.0 million of intellectual property license revenue unrelated to key development programs. This compared to total revenues of $130.5 million for the same period in the prior fiscal year.

·                  Revenues from the company’s five key commercial products for the quarter grew 26% to $89.5 million from $71.2 million for the same period in the prior fiscal year.

·                  Non-GAAP net income increased to $56.3 million, or a non-GAAP diluted earnings per share (EPS) of $0.40, for the quarter. This compared to non-GAAP net income of $16.5 million, or a non-GAAP diluted EPS of $0.12, for the same period in the prior fiscal year.



The following information was filed by Alkermes Plc. (ALKS) on Thursday, May 23, 2013 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-K Annual Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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