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

Koppers Holdings Inc. Koppers H (symbol: KOP) was one of the worst losers
of the trading day today (2016-07-18), losing -6.42%. The number of shares
that changed hands was 186,185, or about 1 times the average daily volume
in the stock.
The closing price was $30.44, amounting to a market cap of $627,730,000,
about -8.37% off the highest price in the last 12 months. The stock has
been trading at a range between $13.58 and $33.22.
KOP is in the Forest Products industry, part of the Basic Industries
sector. It first went public in 2006.