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

Packaging Corporation of Americ (symbol: PKG) was one of the worst losers
of the trading day today (2016-01-25), losing -12.96%. The number of shares
that changed hands was 3,762,150, or about 4 times the average daily volume
in the stock.
The closing price was $50.19, amounting to a market cap of $4,820,000,000,
about -40.87% off the highest price in the last 12 months. The stock has
been trading at a range between $49.9 and $84.88.
PKG is in the Containers/Packaging industry, part of the Consumer Durables
sector. It first went public in 2000.
Looking at its valuation, the stock is now trading at 11.44 times earnings.