$ACAD is one of biggest losers #stocks today. read more:

ACADIA Pharmaceuticals Inc. (symbol: ACAD) was one of the worst losers of
the trading day today (2016-06-21), losing -6.44%. The number of shares
that changed hands was 3,544,472, or about 1 times the average daily volume
in the stock.
The closing price was $34.99, amounting to a market cap of $3,960,000,000,
about -32.7% off the highest price in the last 12 months. The stock has
been trading at a range between $16.64 and $51.99.
ACAD is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 1985.