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Achillion Added to the NASDAQ Biotechnology Index (NBI)

NEW HAVEN, Conn., May 18, 2011 (GLOBE NEWSWIRE) -- Achillion Pharmaceuticals, Inc. (Nasdaq:ACHN), a leader in the discovery and development of small molecule drugs to combat the most challenging infectious diseases, announced that the Company will be added to the NASDAQ Biotechnology Index® (Nasdaq:NBI). The semi-annual re-ranking of the index will become effective when the market opens on Monday, May 23, 2011.
/ Source: GlobeNewswire

NEW HAVEN, Conn., May 18, 2011 (GLOBE NEWSWIRE) -- Achillion Pharmaceuticals, Inc. (Nasdaq:ACHN), a leader in the discovery and development of small molecule drugs to combat the most challenging infectious diseases, announced that the Company will be added to the NASDAQ Biotechnology Index® (Nasdaq:NBI). The semi-annual re-ranking of the index will become effective when the market opens on Monday, May 23, 2011.

The NASDAQ Biotechnology Index is designed to track the performance of a set of NASDAQ listed securities that are classified as either biotechnology or pharmaceutical according to the Industry Classification Benchmark (ICB). The NASDAQ Biotechnology Index is the basis for the iShares Nasdaq Biotechnology IndexSM Fund (Nasdaq:IBB), which seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the NASDAQ Biotechnology Index. In addition, options based on the NASDAQ Biotechnology Index and the iShares Nasdaq Biotechnology Index Fund trade on various exchanges.

For more information about the NASDAQ Biotechnology Index, including detailed eligibility criteria, visit https://indexes.nasdaqomx.com/.

About Achillion Pharmaceuticals

Achillion is an innovative pharmaceutical company dedicated to bringing important new treatments to patients with infectious disease. Achillion's proven discovery and development teams have advanced multiple product candidates with novel mechanisms of action. Achillion is focused on solutions for the most challenging problems in infectious disease including hepatitis C and resistant bacterial infections. For more information on Achillion Pharmaceuticals, please visit or call 1-203-624-7000.

CONTACT: Company Contact: Glenn Schulman Achillion Pharmaceuticals, Inc. Tel. (203) 624-7000 gschulman@achillion.com Investors: Mary Kay Fenton Achillion Pharmaceuticals, Inc. Tel. (203) 624-7000 mfenton@achillion.com Media: Christin Culotta Miller Ogilvy PR Tel. (212) 880-5264 Christin.Miller@OgilvyPR.com