ACADIA Pharmaceuticals Added to Large-Cap Russell 1000 Market Index

ACADIA Pharmaceuticals Inc. (NASDAQ:ACAD), a biopharmaceutical company focused on the development and commercialization of innovative medicines that address unmet medical needs in central nervous system disorders, today announced that it has been added to the Russell 1000 Index, effective June 27, 2016. The Russell 1000 Index measures the performance of the large-cap segment of the U.S. equity universe. It is a subset of the Russell 3000 Index and includes approximately 1000 of the largest securities based on a combination of their market cap and current index membership. All Russell indices are reconstituted on an annual basis to ensure new and growing equities are reflected accurately in each index.

About ACADIA Pharmaceuticals

ACADIA is a biopharmaceutical company focused on the development and commercialization of innovative medicines to address unmet medical needs in central nervous system disorders. ACADIA maintains a website at www.acadia-pharm.com to which we regularly post copies of our press releases as well as additional information and through which interested parties can subscribe to receive e-mail alerts.

About FTSE Russell

FTSE Russell is a global index leader and data provider that provides innovative benchmarking, analytics and data solutions for investors worldwide. FTSE Russell calculates thousands of indexes that measure and benchmark markets and asset classes in more than 70 countries, covering 98% of the investable market globally. FTSE Russell index expertise and products are used extensively by institutional and retail investors globally. FTSE Russell is wholly owned by London Stock Exchange Group. For more information, visit www.ftserussell.com.

Forward-Looking Statements

Statements in this press release that are not strictly historical in nature are forward-looking statements. These statements include but are not limited to statements related to the progress and timing of ACADIA’s drug discovery and development programs, and the benefits to be derived from NUPLAZID™ (pimavanserin) and ACADIA’s product candidates. These statements are only predictions based on current information and expectations and involve a number of risks and uncertainties. Actual events or results may differ materially from those projected in any of such statements due to various factors, including the risks and uncertainties inherent in drug discovery, development, approval and commercialization, and in collaborations with others, and the fact that past results of clinical trials may not be indicative of future trial results. For a discussion of these and other factors, please refer to ACADIA’s annual report on Form 10-K for the year ended December 31, 2015 as well as ACADIA’s subsequent filings with the Securities and Exchange Commission. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof. This caution is made under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. All forward-looking statements are qualified in their entirety by this cautionary statement and ACADIA undertakes no obligation to revise or update this press release to reflect events or circumstances after the date hereof, except as required by law.

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Investor Contact:ACADIA Pharmaceuticals Inc.Lisa Barthelemy, Investor Relations(858) [e-mail] Contact:Taft and PartnersTed Deutsch(609) [e-mail]