Acorda Rises Most Since 2009 on $525 Million Civitas Deal

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Acorda Therapeutics Inc. gained the most in nearly five years after agreeing to buy Civitas Therapeutics Inc., the developer of an experimental Parkinson’s disease therapy.

Shares of Ardsley, New York-based Acorda rose 28 percent to close at $37.69 in New York, the biggest single-day gain since October 2009, according to data compiled by Bloomberg.