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

Acadia Healthcare Company, Inc. (symbol: ACHC) was one of the worst losers
of the trading day today (2016-10-19), losing -10.56%. The number of shares
that changed hands was 8,760,663, or about 8 times the average daily volume
in the stock.
The closing price was $40.42, amounting to a market cap of $3,530,000,000,
about -45.94% off the highest price in the last 12 months. The stock has
been trading at a range between $37.96 and $74.77.
ACHC is in the Medical Specialities industry, part of the Health Care
sector.
Looking at its valuation, the stock is now trading at 21.59 times earnings.